MSBTE Mobile Application Development 316006 Practicals Solved

Practical 1Compulsory

Install Android Studio, create an Android Virtual Device and set up React Native

Aim: Install the Android IDE, create and start an emulator (AVD), run a first app; set up the React Native environment.

Qa) Install and configure the Android IDE and create an Android Virtual Device (AVD). b) Install and configure the React Native environment.

Showing answer A of 3 · tap A, B or C to see the others

Download Android Studio from developer.android.com/studio and install it (keep "Android Virtual Device" ticked).
First start: choose Standard setup; it downloads the Android SDK, platform tools and an emulator image.
New Project → Empty Views Activity → Name: MyApp, Language: Java, Minimum SDK: API 24 → Finish.
Tools → Device Manager → Create Device → Pixel 6 → system image (e.g. API 34) → Next → Finish.
Press the green Run ▶ button and pick the AVD. Wait for the emulator to boot; the app opens.

Output

The emulator opens a phone window
and the app shows in the centre:
Android Studio is ready!
Running on: sdk_gphone64_x86_64
Android version: 14
API level: 34
(The model and version are those of
the AVD you created.)

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical"
    android:padding="24dp">

Install Node.js LTS from nodejs.org and check: node -v and npm -v.
Open Command Prompt and create a project: npx create-expo-app@latest MyFirstApp
cd MyFirstApp, then replace App.js (or app/index.js) with the program and run: npx expo start
Install "Expo Go" from the Play Store on your phone and scan the QR code shown in the terminal.
To use the emulator instead: start the AVD from Android Studio and press a in the terminal.

Output

In the Expo Go app (or the emulator)
the screen shows:
React Native is ready!
Button pressed 0 times
[ PRESS ME ]
Each press increases the number:
Button pressed 1 times, 2 times, ...

// FILE: App.js
import React, { useState } from 'react';
import { View, Text, Button, StyleSheet } from 'react-native';

export default function App() {
  const [count, setCount] = useState(0);
  return (
    <View style={styles.box}>

On the phone: Settings → About phone → tap "Build number" 7 times to enable Developer options.
Settings → Developer options → turn on USB debugging.
Connect the phone with a USB cable and allow the "Allow USB debugging?" prompt.
In Android Studio the phone appears in the device list next to the Run button. Select it and press Run ▶.
Wireless: Developer options → Wireless debugging → Pair device with QR code (Android 11+).

Output

On the phone the app shows
"Installed on my phone" and a CHECK
DEVICE button.
After tapping it (example on a real
phone):
samsung SM-A155F
This is a real phone

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical"
    android:padding="24dp">

🎤 Viva questions (5)

Q. What is an AVD?: A. Android Virtual Device — an emulator configuration (phone model + Android version) to run apps on the PC.
Q. What is the Android SDK?: A. Software Development Kit: tools, libraries and platform files needed to build Android apps.
Q. What does Gradle do in Android Studio?: A. It builds the project: compiles code, packs resources and creates the APK.
Q. What is React Native?: A. A JavaScript framework by Meta for building native Android and iOS apps from one code base.
Q. What is an APK?: A. Android Package — the file that installs an app on a phone.

Practical 2

Display "Hello World" on the screen

Aim: Create a first Android app that displays Hello World using XML and Java.

QDevelop a program to display "Hello World" on the screen.

Showing answer A of 3 · tap A, B or C to see the others

Output

A white screen with "Hello World" in
large bold letters in the centre.

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

Output

The whole screen is dark blue with
"Hello World" in big white letters
in the centre.

// FILE: MainActivity.java
package com.example.myapp;

import android.graphics.Color;
import android.os.Bundle;
import android.view.Gravity;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;

Output

Centre of the screen: "Hello World"
in big green letters and below it
"Welcome to Mobile Application
Development".
A Toast "Hello World from Java!"
appears near the bottom for about 3
seconds.

// FILE: res/values/strings.xml
<resources>
    <string name="hello">Hello World</string>
    <string name="welcome">Welcome to Mobile Application Development</string>
</resources>

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>

🎤 Viva questions (5)

Q. What is an Activity?: A. One screen of an Android app with a user interface; it extends Activity/AppCompatActivity.
Q. What is the use of setContentView()?: A. It sets the layout (UI) that the activity displays.
Q. What is the difference between dp and sp?: A. dp is used for sizes and margins; sp is used for text and also follows the user's font size.
Q. What is the R class?: A. An auto-generated class that holds ids of all resources (layouts, strings, views).
Q. What is a Toast?: A. A short pop-up message that disappears automatically.

Practical 3Compulsory

Explore the directory structure of an Android project

Aim: Understand manifests, java, res (layout, values, drawable, mipmap) and Gradle files of an Android project.

QExplore the directory structure of an Android project in the Android IDE and use its resource folders.

Showing answer A of 3 · tap A, B or C to see the others

Switch the Project window to the "Android" view (top-left drop-down).
app → manifests → AndroidManifest.xml: app name, icon, activities, permissions.
app → java → com.example.myapp: MainActivity.java and other classes (androidTest/test hold tests).
app → res: drawable (images/shapes), layout (screens), mipmap (launcher icons), values (strings, colors, themes).
Gradle Scripts → build.gradle (Module :app): applicationId, minSdk, targetSdk, dependencies.

Output

Heading "Project Structure" in dark
blue, followed by four light-blue
boxes:
manifests/ – AndroidManifest.xml
java/ – Activity and other Java
classes
res/ – layouts, images, strings,
colours
Gradle Scripts – build.gradle files

// FILE: res/values/strings.xml
<resources>
    <string name="title">Project Structure</string>
    <string name="java_folder">java/ – Activity and other Java classes</string>
    <string name="res_folder">res/ – layouts, images, strings, colours</string>
    <string name="manifest_folder">manifests/ – AndroidManifest.xml</string>
    <string name="gradle_folder">Gradle Scripts – build.gradle files</string>
</resources>

Output

Blue gradient background (dark at
the bottom, light at the top). In
the middle a cream card with an
orange border and rounded corners
shows the text about res/drawable;
below it a yellow star icon.

// FILE: res/drawable/rounded_card.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="#FFF7ED" />
    <stroke android:width="2dp" android:color="#EA580C" />
    <corners android:radius="16dp" />
</shape>

Output

A monospace list on the screen
(values depend on your project),
e.g.:
Package name : com.example.myapp
Version name : 1.0
Min SDK      : 24
Target SDK   : 34
App folder   :
/data/user/0/com.example.myapp

Layout id    : 2131427356
TextView id  : 2131231162

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/tvDetails"

🎤 Viva questions (5)

Q. What is AndroidManifest.xml?: A. The file that declares the app's package, components (activities, services, receivers) and permissions.
Q. What is stored in the res folder?: A. Resources: layouts, drawables, mipmap icons, values (strings, colours, dimens, themes).
Q. What is the difference between drawable and mipmap?: A. mipmap holds launcher icons in many densities; drawable holds other images and shapes.
Q. What is build.gradle (Module :app)?: A. Build settings of the app: applicationId, SDK versions, dependencies.
Q. What is the R.java (R class)?: A. Auto-generated class with integer ids for every resource.

Practical 4Compulsory

App using TextView and EditText

Aim: Accept input with EditText and show results in TextView.

QDevelop a program to implement TextView and EditText.

Showing answer A of 3 · tap A, B or C to see the others

Output

Screen: "Enter your name", a text
box (hint "e.g. Priya") and a GREET
ME button.
Type Priya and tap the button →
below it shows in bold blue: Hello
Priya, welcome to MAD practicals!
Tap with an empty box → red error
"Please enter your name".

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="24dp">

Output

Two number boxes and an ADD button.
Enter 12.5 and 7.5, tap ADD →
centred text: 12.5 + 7.5 = 20.0
With a box empty → "Enter both
numbers".

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="24dp">

Output

A multi-line box, a counter "0 /
100" on the right and an empty
preview box.
While typing "Practical session
started" the counter shows 25 / 100
and the preview shows PREVIEW:
PRACTICAL SESSION STARTED. After 90
characters the counter turns red.

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="24dp">

🎤 Viva questions (5)

Q. What is the difference between TextView and EditText?: A. TextView only displays text; EditText (a subclass of TextView) lets the user type.
Q. What is the use of android:hint?: A. Grey placeholder text shown when the EditText is empty.
Q. What does inputType do?: A. Chooses the keyboard and input rules (number, email, password, phone…).
Q. How do you read text from an EditText?: A. editText.getText().toString().
Q. What is TextWatcher?: A. An interface with beforeTextChanged, onTextChanged and afterTextChanged to react while text changes.

Practical 5Compulsory

Button, ImageButton and ToggleButton

Aim: Handle clicks on Button, ImageButton and ToggleButton.

QDevelop a program to implement Button, ImageButton and ToggleButton.

Showing answer A of 3 · tap A, B or C to see the others

Output

A full-width NORMAL BUTTON, a phone
(call) icon button and a WI-FI OFF
toggle.
Tap Normal → "Normal Button
clicked". Tap the phone icon →
"ImageButton (Call) clicked". Tap
the toggle → it shows WI-FI ON and
the text "Toggle is ON".

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal"
    android:orientation="vertical"
    android:padding="24dp">

Output

Big text "0 likes", a grey star and
a RESET button.
Tap the star 3 times → "3 likes" and
the star turns yellow. Tap RESET →
"0 likes" and the grey star again.

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical"
    android:padding="24dp">

Output

A DARK MODE: OFF toggle, a "Large
text" switch, a sample paragraph and
a SHOW SETTINGS button.
Toggle ON → the screen turns dark
navy with white text. Switch ON →
the paragraph gets bigger. SHOW
SETTINGS → Toast "Dark: ON, Large
text: ON".

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/root"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="24dp">

🎤 Viva questions (5)

Q. What is the difference between Button and ImageButton?: A. Button shows text; ImageButton shows an image (src).
Q. What is a ToggleButton?: A. A button with two states (on/off) and different text for each state.
Q. Which listener is used for ToggleButton?: A. CompoundButton.OnCheckedChangeListener (setOnCheckedChangeListener).
Q. What are textOn and textOff?: A. Texts shown on a ToggleButton for the ON and OFF states.
Q. Name two ways to handle a button click.: A. setOnClickListener in Java, or android:onClick attribute in XML.

Practical 6Compulsory

CheckBox and RadioButton

Aim: Allow multiple choices with CheckBox and one choice with RadioButton in a RadioGroup.

QDevelop a program to implement CheckBox and RadioButton.

Showing answer A of 3 · tap A, B or C to see the others

Output

Three item check boxes, payment
radio buttons (Cash selected) and
PLACE ORDER.
Tick Tea and Sandwich, choose UPI,
tap PLACE ORDER →
Items: Tea, Sandwich
Total: Rs. 55
Payment: UPI

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="20dp">

Output

Gender radio buttons, Year radio
buttons (vertical), a "Needs hostel"
check box and a grey summary box
"Make your choices".
Choose Female, Second year, tick
hostel → the box shows:
Gender : Female
Year   : Second year
Hostel : Yes

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="20dp">

Output

Two MCQs with three options each, a
"Show correct answers" check box and
SUBMIT.
Choose XML and strings.xml, tick the
check box, SUBMIT →
Score: 1 / 2
Correct: Q1 = XML, Q2 =
AndroidManifest.xml

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="20dp">

🎤 Viva questions (5)

Q. What is the difference between CheckBox and RadioButton?: A. CheckBoxes allow many selections; radio buttons in a group allow only one.
Q. Why is RadioGroup needed?: A. It makes its radio buttons mutually exclusive.
Q. How do you know which RadioButton is selected?: A. radioGroup.getCheckedRadioButtonId(), then findViewById(id).
Q. Which method tells if a CheckBox is ticked?: A. isChecked().
Q. What does getCheckedRadioButtonId() return when nothing is selected?: A. -1.

Practical 7

ProgressBar

Aim: Show progress with horizontal and circular ProgressBars and update them from code.

QDevelop a program to implement ProgressBar.

Showing answer A of 3 · tap A, B or C to see the others

Output

A horizontal bar filled 30%, the
text "30%" and two buttons - 10 and
+ 10.
Tap + 10 seven times → the bar is
full and the text says "100% -
Complete!". - 10 empties it step by
step.

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical"
    android:padding="24dp">

Output

A LOAD RESULT button. Tap it → the
button greys out, "Loading..."
appears and a circle spins for 3
seconds.
Then the spinner disappears and the
text shows "Result: PASS with
78.40%".

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical"
    android:padding="24dp">

Output

File name "practical_file.pdf (5
MB)", an empty bar, "Not started"
and START DOWNLOAD.
Tap the button → the bar fills in 4
seconds: "Downloading... 45% (2.25
MB)" ... and finally "Download
complete ✓".

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="24dp">

🎤 Viva questions (5)

Q. What are the two types of ProgressBar?: A. Determinate (horizontal, shows exact progress) and indeterminate (spinning, unknown duration).
Q. Which methods set the progress?: A. setProgress(int) and setMax(int); getProgress() reads it.
Q. Why can't we update the ProgressBar directly from a Thread?: A. Views are not thread-safe; only the UI thread may change them (use runOnUiThread or a Handler).
Q. What is secondaryProgress?: A. A second fill level, e.g. buffered part of a video.
Q. How do you hide a ProgressBar?: A. setVisibility(View.GONE) or View.INVISIBLE.

Practical 8Compulsory

Login form using UI controls

Aim: Create a login screen with EditText, Button, CheckBox and validation.

QDevelop a login form using the above UI controls.

Showing answer A of 3 · tap A, B or C to see the others

Output

Title "Student Login", Username and
Password boxes and a LOGIN button.
student / mad@123 → green "Login
successful. Welcome student!"
Wrong password → red "Invalid
username or password". Short
password → error "Minimum 6
characters" on the field.

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_vertical"
    android:orientation="vertical"
    android:padding="28dp">

Output

Sign in screen with Email, Password,
"Show password", "Remember me" and
SIGN IN.
Ticking Show password reveals the
typed password. Signing in with
"Remember me" shows Toast "Signed in
as riya@gmail.com"; when the app is
opened again, the email box is
already filled and Remember me is
ticked.

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="28dp">

Output

A lock icon, Enrollment number and
PIN fields, LOGIN and "Attempts
left: 3".
Wrong PIN → red "Wrong details.
Attempts left: 2"... after the third
wrong try: "Account locked. Contact
the admin." and everything greys
out.
2206140101 with PIN 2580 → green
"Welcome! Login successful".

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="28dp">

🎤 Viva questions (5)

Q. Which inputType hides a password?: A. textPassword (or numberPassword for digits).
Q. How do you show an error on an EditText?: A. editText.setError("message").
Q. What is SharedPreferences?: A. A simple key–value storage to save small data such as settings or a saved email.
Q. Why should passwords not be stored in plain text?: A. Anyone with access to the phone or database could read them; they should be hashed on a server.
Q. How do you disable a button?: A. button.setEnabled(false).

Practical 9Compulsory

LinearLayout and ConstraintLayout: registration form with a custom Toast

Aim: Design a registration form with LinearLayout and ConstraintLayout and show a custom Toast alert.

QDevelop a registration form using LinearLayout and ConstraintLayout and display a custom Toast alert.

Showing answer A of 3 · tap A, B or C to see the others

Output

Title "Registration", fields Full
name, Email, Mobile and Branch |
Semester side by side, and REGISTER.
After filling the form and tapping
REGISTER, a green box with a tick
icon and white text "Registered:
Riya Patil" appears in the middle of
the screen for about 3 seconds.

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="24dp">

Output

Title "Create account", First name |
Last name side by side, Email,
Password, "I accept the terms" and
CREATE ACCOUNT.
Empty fields → a dark toast with a
warning icon and yellow text "Please
fill all fields" near the top.
All filled with terms ticked → dark
toast with a tick: "Account created
for Rahul".

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="24dp">

Output

A blue screen with white heading
"Workshop Registration" and a white
card holding Name, College,
Morning/Evening slot and JOIN
WORKSHOP.
After filling and tapping the
button, a yellow toast near the
bottom shows:
SEAT CONFIRMED
Amit Shinde
Morning slot · Seat 437 (the seat
number is random).

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#1E3A8A">

🎤 Viva questions (5)

Q. What is the difference between LinearLayout and ConstraintLayout?: A. LinearLayout arranges children in one row or column; ConstraintLayout positions each view with constraints relative to others, giving flat layouts.
Q. What is layout_weight?: A. It divides the remaining space of a LinearLayout among children in a ratio.
Q. What is a custom Toast?: A. A Toast whose look comes from our own layout, set with toast.setView().
Q. What does 0dp mean in ConstraintLayout?: A. Match constraints — the view takes the space between its constraints.
Q. What is a chain in ConstraintLayout?: A. A group of views linked to each other in both directions, sharing space (spread, packed, weighted).

Practical 10

FrameLayout, TableLayout and RelativeLayout for an e-commerce app

Aim: Design e-commerce screens using FrameLayout, TableLayout and RelativeLayout.

QDevelop a program to implement FrameLayout, TableLayout and RelativeLayout for an e-commerce application.

Showing answer A of 3 · tap A, B or C to see the others

Output

A light-blue banner with a camera
icon in the middle, a red "40% OFF"
badge at the top-left and a dark
strip at the bottom "Pocket Camera ·
Rs. 2,999". Below it ADD TO CART.
Tapping the button shows Toast
"Pocket Camera added to cart" and
the button text becomes "Added (1)",
"Added (2)"...

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="16dp">

Output

Heading "My Cart" and a table with a
blue header (Item | Qty | Amount):
USB Cable    2   Rs. 298
Earphones    1   Rs. 599   (light
grey row)
Phone Cover  1   Rs. 249
Below on the right: Total: Rs. 1146

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="16dp">

Output

A cream image area with a gallery
icon; below it "Smart Watch S2" on
the left and green "Rs. 1,799" on
the right, 4.5 small stars, and the
description.
At the bottom-right: WISHLIST and
BUY NOW. BUY NOW → Toast "Proceeding
to checkout: Rs. 1,799". WISHLIST
changes to "Wishlisted ♥" and greys
out.

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="16dp">

    <ImageView android:id="@+id/ivProduct" android:layout_width="match_parent" android:layout_height="200dp"

🎤 Viva questions (5)

Q. What is FrameLayout used for?: A. To stack views on top of each other, e.g. badges or captions over images.
Q. What are TableRow and stretchColumns?: A. TableRow is one row of a TableLayout; stretchColumns lets columns expand to fill the width.
Q. Name four RelativeLayout attributes.: A. layout_below, layout_toStartOf, layout_alignParentEnd, layout_centerInParent.
Q. Which layout is recommended instead of RelativeLayout today?: A. ConstraintLayout.
Q. What does layout_gravity do in a FrameLayout?: A. It decides where a child is placed inside the frame (top, bottom, center...).

Practical 11Compulsory

GridView, ImageView, ScrollView and ListView for a management system

Aim: Show lists and grids with adapters, images and scrolling screens for a library / hotel management app.

QDevelop a program to implement GridView, ImageView, ScrollView and ListView for a management system (library / hotel).

Showing answer A of 3 · tap A, B or C to see the others

Output

Blue header "College Library" and a
list of 5 books, each row with a
book icon, bold title, author name
and a status on the right (green
"Available" or red "Issued").
Tap "Java: The Complete Reference" →
Toast "Java: The Complete Reference
is already issued".

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView android:layout_width="match_parent" android:layout_height="wrap_content"

Output

Heading "Hotel Sai Palace – Rooms"
and a 3 × 3 grid of room cards with
a pin icon: green cards say e.g.
"Room 101 / Single · Free", pink
cards say "Room 102 / Double ·
Booked".
Tapping a card switches it between
Booked and Free and the heading
changes, e.g. "Hotel Sai Palace – 5
rooms free".

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="12dp">

Output

A light-blue cover image, title
"Android Programming", "Shelf B-12 ·
Copies: 4 · Available: 2" and a list
of 12 chapters; the page scrolls up
and down.
At the bottom ISSUE THIS BOOK →
"Issued · return by <date 14 days
later> (1 left)"; after two issues
it shows "No copies left".

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content"
        android:orientation="vertical" android:padding="16dp">

🎤 Viva questions (5)

Q. What is an Adapter?: A. A bridge between data and an AdapterView (ListView, GridView, Spinner) that creates a view for each item.
Q. What is the difference between ListView and GridView?: A. ListView shows one column of rows; GridView shows items in multiple columns.
Q. Why must ScrollView have only one child?: A. It scrolls a single content view; put a LinearLayout inside to hold many views.
Q. What is convertView?: A. A recycled row view passed to getView() so it can be reused instead of inflating a new one.
Q. What does notifyDataSetChanged() do?: A. Tells the adapter the data changed so the list/grid redraws.

Practical 12

Simple calculator using GridLayout

Aim: Arrange calculator buttons in a GridLayout and perform arithmetic.

QDevelop a simple calculator using a grid layout.

Showing answer A of 3 · tap A, B or C to see the others

Output

A black display showing 0 and a 4 ×
4 keypad filling the rest of the
screen:
7 8 9 /
4 5 6 *
1 2 3 -
C 0 = +
Press 1 2 * 4 = → display shows 48.
9 / 0 = shows "Error". C clears to
0.

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="12dp">

Output

A small grey expression line, a big
display "0", a 4-column keypad with
÷ × − + and a full-width = key at
the bottom.
Press 7 . 5 × 4 = → grey line "7.5 ×
4.0 =" and display 30.0. 5 ÷ 0 = →
"Can't divide by 0".

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="12dp">

Output

A number box, a 3-column grid of 12
keys (x² x³ √x / 1/x log ln / sin
cos tan / n! 10ˣ |x|) and a green
answer box.
Enter 30 and tap sin → "sin(30) =
0.5000". Enter 5, tap n! → "n!(5) =
120.0000". Enter -4, tap √x → "√x is
not defined for -4".

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="16dp">

🎤 Viva questions (5)

Q. What is GridLayout?: A. A layout that places children in rows and columns; cells can span rows/columns.
Q. What is the difference between GridLayout and GridView?: A. GridLayout is a static layout of fixed views; GridView is a scrolling AdapterView for many items.
Q. How do you make a button span two columns?: A. android:layout_columnSpan="2".
Q. What is android:onClick in XML?: A. It names a public method void name(View v) in the activity that runs on click.
Q. How do you handle divide by zero in the calculator?: A. Check the divisor before dividing (or check for Infinity/NaN) and show a message.

Practical 13Compulsory

Splash screen

Aim: Show a splash screen for a few seconds and then open the main screen.

QDevelop a program to implement a splash screen.

Showing answer A of 3 · tap A, B or C to see the others

Output

App opens on a dark-blue screen with
a yellow star, "Campus App" and
"Your college in your pocket".
After 3 seconds the "Home screen"
appears. Pressing Back exits the app
(it does not go back to the splash).

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <application>
        <activity android:name=".SplashActivity" android:exported="true"
            android:theme="@style/Theme.AppCompat.Light.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

Output

A dark screen: the yellow "MAD" logo
fades in and grows to full size,
with "Mobile Application
Development" below. A progress bar
fills while the text counts "Loading
4%" … "Loading 100%" (about 2.5
seconds). Then the screen fades to
"Welcome to the main screen".

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <application>
        <activity android:name=".SplashActivity" android:exported="true"
            android:theme="@style/Theme.AppCompat.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

Output

First launch: green screen
"GreenMart" for 2 seconds →
"Welcome! Fresh vegetables at your
door." with GET STARTED → "Home:
today's offers".
Next launches: green splash for 2
seconds → straight to "Home: today's
offers".

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <application>
        <activity android:name=".SplashActivity" android:exported="true"
            android:theme="@style/Theme.AppCompat.Light.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

🎤 Viva questions (5)

Q. What is a splash screen?: A. The first screen shown for a short time while the app starts, usually with a logo.
Q. Why do we call finish() in the splash activity?: A. So the splash is removed and Back does not return to it.
Q. Which component starts the next activity?: A. An Intent: startActivity(new Intent(this, MainActivity.class)).
Q. What is a Handler used for here?: A. To run code after a delay on the main thread (postDelayed).
Q. Which intent-filter makes an activity the launcher?: A. action MAIN with category LAUNCHER.

Practical 14Compulsory

Converter app: temperature, currency, volume

Aim: Build unit converters using EditText, Spinner and buttons.

QDevelop a converter application (temperature / currency / volume).

Showing answer A of 3 · tap A, B or C to see the others

Output

Heading "Temperature Converter", a
value box, °C / °F / K radio buttons
and CONVERT.
Enter 98.6, choose °F, CONVERT →
Celsius    : 37.00 °C
Fahrenheit : 98.60 °F
Kelvin     : 310.15 K

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="24dp">

Output

Heading, an Amount box, two
drop-downs INR → USD, CONVERT and a
note that rates are samples.
Enter 5000, INR → USD → "5000.00 INR
= 60.00 USD". Change to USD → INR
with 100 → "100.00 USD = 8333.33
INR".

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="24dp">

Output

Heading "Volume Converter", a value
box, a unit drop-down (Litre) and a
blue table box "Type a volume".
Type 2 with US gallon selected → the
box shows:
Litre              7.5708
Millilitre      7570.8200
US gallon          2.0000
Cup (240 ml)      31.5451
Cubic metre        0.0076

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="24dp">

🎤 Viva questions (5)

Q. What is a Spinner?: A. A drop-down list that lets the user pick one value.
Q. Which listener is used for Spinner selection?: A. AdapterView.OnItemSelectedListener (onItemSelected / onNothingSelected).
Q. Why convert to a base unit first?: A. Then only one rate per unit is needed instead of a rate for every pair.
Q. How would you get live currency rates?: A. Call an exchange-rate web API (with INTERNET permission) and parse its JSON.
Q. What is the formula for °F to °C?: A. C = (F − 32) × 5 / 9.

Practical 15

Countdown timer

Aim: Use CountDownTimer to build start / pause / reset timers.

QDevelop a simple countdown timer.

Showing answer A of 3 · tap A, B or C to see the others

Output

A big "00:30" with START and STOP.
START → 00:30, 00:29, 00:28 … every
second, then "Time up!". STOP resets
it to 00:30.

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical">

Output

min and sec boxes, a big "00:00" and
START / PAUSE / RESET.
Enter 1 min 30 sec, START → 01:30,
01:29 … PAUSE stops at e.g. 01:12
and the button becomes RESUME;
RESUME continues from 01:12. At the
end the screen shows "Done!".

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal"
    android:orientation="vertical"
    android:padding="24dp">

Output

Text "Viva preparation – 2 minutes
per question", a full blue ring with
"02:00" in the middle and START
QUESTION.
After starting, the ring empties as
the time counts down 01:59, 01:58 …;
the last 10 seconds turn red. At the
end the centre says "Next!", a beep
sounds and the button becomes START
QUESTION 2.

// FILE: res/drawable/ring.xml
<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
    android:fromDegrees="270" android:toDegrees="270">
    <shape android:shape="ring" android:innerRadiusRatio="2.6" android:thicknessRatio="14" android:useLevel="true">
        <solid android:color="#2563EB" />
    </shape>
</rotate>

🎤 Viva questions (5)

Q. What is CountDownTimer?: A. An Android class that counts down a total time and calls onTick() at intervals and onFinish() at the end.
Q. What are the two parameters of CountDownTimer?: A. millisInFuture (total time) and countDownInterval (tick interval) in milliseconds.
Q. How do you stop a CountDownTimer?: A. Call cancel().
Q. Why cancel the timer in onDestroy()?: A. Otherwise it keeps running and updates views of a closed activity.
Q. Can CountDownTimer be paused?: A. Not directly; save the remaining time, cancel it and start a new timer later.

Practical 16Compulsory

Date Picker

Aim: Select dates with the DatePicker widget and DatePickerDialog.

QDevelop a program to implement Date Picker.

Showing answer A of 3 · tap A, B or C to see the others

Output

A calendar of the current month with
today highlighted, a SHOW DATE
button and an empty text.
Select 15 and tap SHOW DATE →
"Selected date: 15/11/2026" (month
and year as shown on the calendar).

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal"
    android:orientation="vertical"
    android:padding="12dp">

Output

A field "Tap to choose a date".
Tapping opens a calendar dialog with
past dates greyed out.
Choose a date 20 days ahead and
press OK → the field shows e.g.
"Tue, 17 Nov 2026" and below "20
days left for the exam".

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="24dp">

Output

A SELECT DATE OF BIRTH button.
Tapping opens a calendar at Jan 2007
(future dates disabled).
Choosing 14/8/2006 shows "Born on
14/8/2006" on the button and below
"Age: 20 years, 2 months, …days" and
"Eligible to vote ✓" (exact numbers
depend on today's date).

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical"
    android:padding="24dp">

🎤 Viva questions (5)

Q. What is the difference between DatePicker and DatePickerDialog?: A. DatePicker is a widget inside the layout; DatePickerDialog shows it in a pop-up dialog.
Q. Why do we add 1 to getMonth()?: A. Months are numbered 0–11 in Android/Java Calendar.
Q. How do you block past dates?: A. datePicker.setMinDate(System.currentTimeMillis()).
Q. Which listener returns the chosen date in a dialog?: A. DatePickerDialog.OnDateSetListener (onDateSet(view, year, month, day)).
Q. Which class formats a date as text?: A. SimpleDateFormat (or java.time.format.DateTimeFormatter).

Practical 17

Time Picker

Aim: Select time with the TimePicker widget and TimePickerDialog.

QDevelop a program to implement Time Picker.

Showing answer A of 3 · tap A, B or C to see the others

Output

A clock-face time picker with AM/PM.
Selecting 3:45 PM shows below:
"Selected: 03:45 PM  (24-hour
15:45)".

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal"
    android:orientation="vertical"
    android:padding="12dp">

Output

A lecture name box and CHOOSE TIME.
Enter "MAD lab", choose 10:30 AM in
the dialog → "Today's lectures:
• MAD lab at 10:30 AM". Add "PWP
  theory" at 2:15 PM → the list
  shows both lines.

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="24dp">

Output

A question, a spinner-style time
picker (hour / minute / AM-PM
wheels) and HOW LONG?.
At 9:20 AM, choosing 11:00 AM gives
"The exam starts today
in 1 hours 40 minutes". Choosing
8:00 AM gives "…tomorrow in 22 hours
40 minutes".

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal"
    android:orientation="vertical"
    android:padding="16dp">

🎤 Viva questions (5)

Q. What are the two modes of TimePicker?: A. clock (analog face) and spinner (scrolling wheels).
Q. How do you show 24-hour format?: A. setIs24HourView(true), or pass true to TimePickerDialog.
Q. Which listener gives the selected time in TimePickerDialog?: A. OnTimeSetListener (onTimeSet(view, hourOfDay, minute)).
Q. What range does hourOfDay have?: A. 0 to 23.
Q. How do you follow the phone's 12/24-hour setting?: A. android.text.format.DateFormat.is24HourFormat(context).

Practical 18

Two activities for a login application

Aim: Move from a login activity to a second activity, passing data with an Intent.

QDevelop a program to create two simple activities for a login application.

Showing answer A of 3 · tap A, B or C to see the others

Output

Login screen with Username, Password
and LOGIN.
admin / 1234 → a new screen
"Welcome, admin!" and "Logged in at
10:42:15 AM". Back returns to the
login screen. Wrong details → Toast
"Wrong username or password".

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <application>
        <activity android:name=".MainActivity" android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />

Output

Faculty Login with Email, Password
and LOGIN. sharma@college.edu with
any 4+ character password →
Dashboard: "Hello, sharma", a blue
box "Today: 3 lectures · 1 practical
· 24 students present" and LOGOUT.
LOGOUT returns to a fresh login
screen; Back there exits the app.

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <application>
        <activity android:name=".MainActivity" android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />

Output

Login screen with "New user?
Register here" in blue. Tap it →
Register screen. Create "riya" /
"4321" → it closes, the login screen
shows "riya" in Username and Toast
"Registered! Now log in."
Enter 4321 and LOGIN → "Login
successful".

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <application>
        <activity android:name=".MainActivity" android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />

🎤 Viva questions (5)

Q. What is an Intent?: A. A message object used to start an activity/service or to deliver a broadcast.
Q. How do you pass data between activities?: A. putExtra() on the intent and getIntent().getXxxExtra() in the new activity.
Q. What does finish() do?: A. Closes the current activity and removes it from the back stack.
Q. What is the back stack?: A. The stack of opened activities; Back pops the top one.
Q. How does an activity return a result?: A. setResult(RESULT_OK, intent) then finish(); the caller receives it via ActivityResultLauncher.

Practical 19Compulsory

Explicit intent and implicit intent

Aim: Open a new activity with an explicit intent and open a website (and other apps) with implicit intents.

Q1Program 1: create a new activity using an explicit intent.

Showing answer A of 3 · tap A, B or C to see the others

Output

Name and marks boxes with SHOW
RESULT. Enter "Om Jadhav" and 82 → a
new screen with a back arrow: "Om
Jadhav · 82/100" and a big green
"Distinction". With 35 marks the
grade is a red "Fail".

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <application>
        <activity android:name=".MainActivity" android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />

Output

A list of 4 subjects. Tap "Mobile
Application Development" → detail
screen: title, "Course code: 316006
Credits: 4" and NEXT SUBJECT. NEXT
shows "Programming with Python"
(316314) and so on; Back returns to
the list.

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <application>
        <activity android:name=".MainActivity" android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />

Output

Main screen: "No colour chosen" and
PICK A THEME COLOUR. It opens a
screen with BLUE, GREEN, ORANGE. Tap
GREEN → back on the main screen, the
background turns light green and the
text says "Theme: Green". Pressing
Back instead shows "Cancelled – no
colour chosen".

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <application>
        <activity android:name=".MainActivity" android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />

Q2Program 2: use an implicit intent to open a website.

Showing answer A of 3 · tap A, B or C to see the others

Output

Two buttons. OPEN MSBTE WEBSITE
opens msbte.ac.in in Chrome (or asks
which browser to use). OPEN ANDROID
DEVELOPERS SITE opens
developer.android.com. Back returns
to the app.

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="24dp">
    <Button android:id="@+id/btnMsbte" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Open MSBTE website" />

Output

A URL box and OPEN. Type
"anandatechnologies.in" and press Go
→ a chooser "Open with" lists the
browsers; choosing one opens the
website. Typing "hello world" shows
the error "Not a valid web address".

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="24dp">
    <EditText android:id="@+id/etUrl" android:layout_width="match_parent" android:layout_height="wrap_content"

Output

Heading "Contact the college office"
and four buttons:
WEBSITE → opens msbte.ac.in in the
browser
CALL OFFICE → dialer with
02012345678 filled
SHOW ON MAP → Google Maps searching
"Shivajinagar, Pune"
SHARE APP LINK → "Share via" sheet
with WhatsApp, Gmail, Messages…

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="24dp">
    <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Contact the college office" android:textSize="20sp" android:textStyle="bold" />

🎤 Viva questions (5)

Q. What is the difference between explicit and implicit intents?: A. Explicit names the target class; implicit gives an action/data and Android finds a suitable app.
Q. Which action opens a web page?: A. Intent.ACTION_VIEW with an http/https Uri.
Q. What is an intent filter?: A. Manifest entry that says which implicit intents (actions, categories, data) a component can handle.
Q. What does Intent.createChooser() do?: A. Shows a dialog to choose which app should handle the intent.
Q. Why catch ActivityNotFoundException?: A. If no installed app can handle the implicit intent, startActivity throws it.

Practical 20Compulsory

Services like Bluetooth and Wi-Fi

Aim: Turn on/off and use Bluetooth, list paired devices and check/open Wi-Fi settings with proper permissions.

QDevelop a program to use services like Bluetooth / Wi-Fi.

Showing answer A of 3 · tap A, B or C to see the others

Output

A Bluetooth icon, the status
"Bluetooth is OFF" and three
buttons. First launch asks "Allow
app to find, connect to… nearby
devices?".
TURN ON → system dialog; after Allow
the status shows "Bluetooth is ON".
MAKE VISIBLE → "make your phone
visible for 120 seconds?". TURN OFF
→ on Android 13+ opens the Bluetooth
settings page; on older phones Toast
"Bluetooth turned OFF".

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-permission android:name="android.permission.BLUETOOTH" android:maxSdkVersion="30" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" android:maxSdkVersion="30" />
    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE" />
    <application>

Output

A SHOW PAIRED DEVICES button. After
allowing the permission and with
Bluetooth ON, the list shows the
phone's paired devices, e.g.
boAt Rockerz 255
XX:XX:XX:XX:XX:XX
Realme Buds
XX:XX:XX:XX:XX:XX
(the real names/addresses of your
devices). With Bluetooth OFF → Toast
"Turn Bluetooth ON first".

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-permission android:name="android.permission.BLUETOOTH" android:maxSdkVersion="30" />
    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
    <application>
        <activity android:name=".MainActivity" android:exported="true">
            <intent-filter>

Output

A blue box e.g. "Wi-Fi radio : ON
Connected via: Wi-Fi", a TURN WI-FI
ON / OFF button and REFRESH STATUS.
On Android 10+ the toggle button
slides up the system Wi-Fi panel
where the user switches Wi-Fi;
coming back updates the box (e.g.
"Wi-Fi radio : OFF
Connected via: Mobile data").

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <application>
        <activity android:name=".MainActivity" android:exported="true">

🎤 Viva questions (5)

Q. Which class controls Bluetooth?: A. BluetoothAdapter (obtained from BluetoothManager).
Q. Which permission is needed for Bluetooth on Android 12+?: A. BLUETOOTH_CONNECT (and BLUETOOTH_SCAN to discover devices) — runtime permissions.
Q. How do you ask the user to turn on Bluetooth?: A. startActivity(new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE)).
Q. Which class gives the Wi-Fi state?: A. WifiManager (isWifiEnabled()).
Q. Why can't new apps switch Wi-Fi directly?: A. From Android 10 setWifiEnabled() is blocked for privacy; apps use the Settings Panel instead.

Practical 21Compulsory

Broadcast receiver: Airplane, Silent and Loud mode

Aim: Receive system broadcasts for airplane mode and ringer mode changes, and switch ringer modes.

QDevelop a program to implement a broadcast receiver for Airplane mode / Silent mode / Loud mode.

Showing answer A of 3 · tap A, B or C to see the others

Output

A plane icon and green "Airplane
mode is OFF". Turning airplane mode
ON from quick settings changes it to
red "Airplane mode is ON" with Toast
"Airplane mode ON"; turning it off
shows green "OFF" again.

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical"
    android:padding="24dp">

Output

A blue box showing the current mode,
e.g. "🔔 Loud / normal mode", and
buttons SILENT, VIBRATE, LOUD.
First time: Toast "Allow Do Not
Disturb access for this app" and the
access settings open. After
allowing, SILENT shows "🔕 Silent
mode", VIBRATE "📳 Vibrate mode".
Changing the mode with the volume
keys also updates the box.

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-permission android:name="android.permission.ACCESS_NOTIFICATION_POLICY" />
    <application>
        <activity android:name=".MainActivity" android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

Output

Heading "Phone event log" and an
empty list. While the app is open:
10:41:05 AM  –  Airplane mode ON
10:41:12 AM  –  Airplane mode OFF
10:41:30 AM  –  Vibrate mode
10:42:02 AM  –  Charger connected
(newest on top; the first ringer
event may appear when the app
starts).

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <application>
        <activity android:name=".MainActivity" android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />

🎤 Viva questions (5)

Q. What is a BroadcastReceiver?: A. A component that receives and reacts to broadcast intents from the system or other apps.
Q. What are the two ways to register a receiver?: A. Statically in AndroidManifest.xml, or dynamically in code with registerReceiver().
Q. Why are most implicit system broadcasts registered in code now?: A. From Android 8, manifest receivers cannot get most implicit broadcasts; dynamic registration still works.
Q. Which broadcast tells that airplane mode changed?: A. Intent.ACTION_AIRPLANE_MODE_CHANGED.
Q. Which class changes silent / vibrate / normal mode?: A. AudioManager.setRingerMode().

Practical 22Compulsory

Registration app: insert and retrieve data from a database

Aim: Store registration data in SQLite with SQLiteOpenHelper and read it back.

QDevelop a registration app to insert and retrieve data from a database.

Showing answer A of 3 · tap A, B or C to see the others

Output

Name, Email, Branch boxes with
REGISTER and VIEW ALL. Register
"Riya Patil / riya@gmail.com / co" →
Toast "Saved with id 1". After
adding two students, VIEW ALL shows:
Total: 2

1. Riya Patil | CO riya@gmail.com
2. Om Shinde | IF om@gmail.com
The data stays after closing the
app.

// FILE: DBHelper.java
package com.example.myapp;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

Output

Heading "Tech Fest Registration",
Name, Mobile, an event drop-down,
REGISTER, a search box and the list
of registrations sorted by name,
e.g.
Amit Shinde  (Robo race)
📞 9876543210
Typing "quiz" in the search box
shows only the Quiz participants.

// FILE: DBHelper.java
package com.example.myapp;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

Output

Heading "Hostel Register", Roll,
Name, Room boxes and INSERT / FIND /
UPDATE / DELETE.
Insert 2201 / Sneha / 104 →
"Inserted. Residents: 1". FIND 2201
→ "Found: Sneha – Room 104". Change
room to 210 and UPDATE → "Updated".
DELETE → "Deleted. Residents: 0".
Inserting the same roll twice →
"Roll already exists."

// FILE: DBHelper.java
package com.example.myapp;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

🎤 Viva questions (5)

Q. What is SQLite?: A. A small, file-based relational database built into Android.
Q. What is SQLiteOpenHelper?: A. A helper class that creates (onCreate) and upgrades (onUpgrade) the database.
Q. What is a Cursor?: A. An object that points to rows of a query result and lets you read columns.
Q. What is ContentValues?: A. A key–value set of column names and values used for insert and update.
Q. Why use ? placeholders in queries?: A. They pass values safely and prevent SQL injection.

Practical 23

Authentication app using a database

Aim: Register users in SQLite and authenticate them at login.

QDevelop an authentication application using a database.

Showing answer A of 3 · tap A, B or C to see the others

Output

Title "Secure Login", Username,
Password, LOGIN and "New user?
Register".
Register "meera" / "meera@12" →
green "Registered. You can log in
now." Registering again → red
"Username already taken". Login with
the right password → "Login
successful ✓"; wrong → "Invalid
username or password".

// FILE: UserDB.java
package com.example.myapp;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

Output

Email, Password, SIGN UP and LOGIN.
After SIGN UP: "Account created" and
below in small monospace text
"Stored in DB (not the password):"
followed by a 64-character hex hash
(different every time because of the
salt).
LOGIN with the same password →
"Welcome! Password verified ✓"; a
wrong one → "Wrong email or
password".

// FILE: UserDB.java
package com.example.myapp;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

Output

Login screen "Gym Members Login"
with Mobile, PIN, LOGIN and the hint
"Demo: 9876543210 / 1234".
Logging in opens "Welcome back, Demo
Student" with LOGOUT. Closing and
reopening the app goes straight to
this welcome screen; after LOGOUT
the login screen appears again.

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <application>
        <activity android:name=".MainActivity" android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />

🎤 Viva questions (5)

Q. What is authentication?: A. Checking who the user is, usually with a username and password.
Q. Why should passwords be hashed?: A. If the database leaks, the real passwords are not exposed.
Q. What is a salt?: A. A random value added to the password before hashing so equal passwords give different hashes.
Q. How do you keep a user logged in?: A. Save a session flag/token in SharedPreferences and check it at start.
Q. Which method returns the number of rows in a Cursor?: A. getCount().

Practical 24

MyContacts app using a database

Aim: Save, list, search, call, edit and delete contacts stored in SQLite.

QDevelop a MyContacts application using a database.

Showing answer A of 3 · tap A, B or C to see the others

Output

"My Contacts (0)", Name and Phone
boxes side by side, ADD CONTACT and
a list. After adding three contacts
the title shows "My Contacts (3)"
and the list is alphabetical, each
row with the name and the number
below it.

// FILE: ContactDB.java
package com.example.myapp;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

Output

A search bar "Search name or number"
and the list:
Amit Kulkarni  ·  Friends
📞 9822012345
Class Teacher  ·  College
📞 9420011122 …
Typing "pri" leaves only Priya
Deshmukh. Tapping a contact opens
the phone dialer with its number
filled in.

// FILE: ContactDB.java
package com.example.myapp;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

Output

+ NEW CONTACT opens a dialog with
Name and Phone and SAVE / CANCEL.
Saved contacts appear in the list.
Long-pressing "Rahul" shows a dialog
titled "Rahul" with Edit and Delete.
Edit opens the filled form; Delete
asks "Delete Rahul?" and removes it
from the list after confirming.

// FILE: ContactDB.java
package com.example.myapp;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

🎤 Viva questions (5)

Q. Which class is used to create the contacts table?: A. A subclass of SQLiteOpenHelper.
Q. How do you call a number without CALL_PHONE permission?: A. Use Intent.ACTION_DIAL with tel:number; the user presses the call button.
Q. What is SearchView?: A. A widget with a search box; OnQueryTextListener gives the typed text.
Q. How do you show a confirmation dialog?: A. AlertDialog.Builder with setMessage, setPositiveButton and setNegativeButton.
Q. What does COLLATE NOCASE do?: A. Makes comparisons/sorting ignore upper and lower case.

Practical 25

Use the camera

Aim: Capture photos with the camera app (thumbnail and full size) and pick images from the gallery.

QDevelop a program to use the camera.

Showing answer A of 3 · tap A, B or C to see the others

Output

A grey image box, OPEN CAMERA and an
empty text. The camera app opens;
after taking a photo and pressing ✓
the image appears in the box and the
text shows e.g. "Preview size: 240 ×
320 px" (a small thumbnail).
Cancelling shows "No photo taken".

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-feature android:name="android.hardware.camera" android:required="false" />
    <application>
        <activity android:name=".MainActivity" android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

Output

A black preview area, TAKE FULL-SIZE
PHOTO and a path line. After taking
a photo the picture fills the black
area and the text shows e.g.
Saved:
/storage/emulated/0/Android/data/com.example.myapp/files/Pictures/IMG_1793176948515.jpg
Size: 2864 KB

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-feature android:name="android.hardware.camera" android:required="false" />
    <application>
        <activity android:name=".MainActivity" android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

Output

Heading "Profile photo", a square
box with a camera icon and CHANGE
PHOTO. Tapping it shows a dialog
"Change profile photo" with "📷 Take
photo" and "🖼️ Choose from gallery".
The chosen or captured picture fills
the square; choosing from the
gallery also shows Toast "Photo
selected from gallery".

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal"
    android:orientation="vertical"
    android:padding="24dp">

🎤 Viva questions (5)

Q. How do you open the camera app?: A. With an intent (MediaStore.ACTION_IMAGE_CAPTURE) or ActivityResultContracts.TakePicture / TakePicturePreview.
Q. Why is CAMERA permission not needed here?: A. The camera app takes the photo; our app only receives the result.
Q. What is FileProvider?: A. A ContentProvider that shares app files with other apps using content:// Uris.
Q. What is the difference between TakePicturePreview and TakePicture?: A. Preview returns a small Bitmap; TakePicture saves the full-size image to a Uri.
Q. Which class is used to build your own camera screen?: A. CameraX (androidx.camera) or the Camera2 API.

Practical 26Compulsory

SMS application

Aim: Send SMS with SmsManager (with permission), open the SMS app, and receive incoming SMS.

QDevelop a program to send and receive SMS.

Showing answer A of 3 · tap A, B or C to see the others

Output

Mobile number and Message boxes and
SEND SMS. The first tap asks "Allow
app to send and view SMS messages?".
After Allow, the SMS is sent from
the phone's SIM and a Toast says
"SMS sent to 9876543210". Deny →
"SMS permission denied".
(Normal SMS charges apply; on an
emulator the message goes to the
emulator's SMS log.)

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-feature android:name="android.hardware.telephony" android:required="false" />
    <uses-permission android:name="android.permission.SEND_SMS" />
    <application>
        <activity android:name=".MainActivity" android:exported="true">
            <intent-filter>

Output

Heading "Inform the class", a
numbers box, a drop-down of message
templates and OPEN IN MESSAGES. The
Messages app opens with the numbers
in "To" and the chosen template
(e.g. "MAD practical tomorrow at 10
AM in Lab 3.") already typed; the
user taps Send.

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="24dp">
    <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Inform the class" android:textSize="22sp" android:textStyle="bold" />

Output

After allowing the permission the
top line says "Waiting for new
SMS…". When an SMS arrives while the
app is open, it appears at the top
of the list:
From: +919876543210
Practical submission is on Monday.
(On the emulator: Extended controls
→ Phone → Send message.)

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-feature android:name="android.hardware.telephony" android:required="false" />
    <uses-permission android:name="android.permission.RECEIVE_SMS" />
    <application>
        <activity android:name=".MainActivity" android:exported="true">
            <intent-filter>

🎤 Viva questions (5)

Q. Which class sends SMS directly?: A. SmsManager (sendTextMessage / sendMultipartTextMessage).
Q. Which permissions are needed to send and receive SMS?: A. SEND_SMS and RECEIVE_SMS (both dangerous, granted at run time).
Q. How do you open the SMS app without permission?: A. Intent ACTION_SENDTO with a smsto: Uri and the "sms_body" extra.
Q. Which broadcast is received for a new SMS?: A. android.provider.Telephony.SMS_RECEIVED (Telephony.Sms.Intents.SMS_RECEIVED_ACTION).
Q. What does divideMessage() do?: A. Splits a long text into parts that fit in single SMS messages.

Practical 27Compulsory

Send and receive e-mail

Aim: Compose and send e-mail through the e-mail app with intents, including CC/BCC and attachments, and open the inbox.

QDevelop a program to send and receive an e-mail.

Showing answer A of 3 · tap A, B or C to see the others

Output

To, Subject and Message boxes and
SEND E-MAIL. Tapping it opens Gmail
with the recipient, subject and
message already filled; the user
taps the send arrow. An invalid
address shows "Invalid e-mail".

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="24dp">
    <EditText android:id="@+id/etTo" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="To" android:inputType="textEmailAddress" />

Output

Heading "Send attendance report",
To, CC, BCC boxes and ATTACH REPORT
AND SEND. A "Send with" sheet
appears; choosing Gmail opens a new
mail with To/CC/BCC filled, subject
"Attendance report – MAD lab", the
message, and "attendance.csv"
attached.

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <application>
        <activity android:name=".MainActivity" android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />

Output

An explanation line, OPEN INBOX, a
"Reply to" box and QUICK REPLY. OPEN
INBOX opens Gmail on the inbox so
received mails can be read. QUICK
REPLY opens a new mail to the typed
address with subject "Re: your mail"
and body "Received, thank you.

Regards".

// FILE: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="24dp">
    <TextView android:layout_width="match_parent" android:layout_height="wrap_content"

🎤 Viva questions (5)

Q. Which intent action composes an e-mail?: A. ACTION_SENDTO with mailto: (or ACTION_SEND with an e-mail type).
Q. Which extras add recipients?: A. EXTRA_EMAIL, EXTRA_CC and EXTRA_BCC (String arrays).
Q. How do you attach a file?: A. Put a content:// Uri (from FileProvider) in EXTRA_STREAM and grant read permission.
Q. Why use mailto: with ACTION_SENDTO?: A. So only e-mail apps are offered in the chooser.
Q. How can an app read e-mails itself?: A. With a mail library using IMAP/POP3 and the user's login, e.g. JavaMail/Jakarta Mail.

Practical 28

Location services with permission checks

Aim: Get the current location with LocationManager after checking permissions, find the address and distance.

QDevelop a program to use location services with permission checks.

Showing answer A of 3 · tap A, B or C to see the others

Output

GET MY LOCATION and a green box. The
phone asks "Allow app to access this
device's location?" (Precise /
Approximate). After Allow:
Latitude : 19.138300
Longitude: 77.321800
Accuracy : 12 m
Provider : gps
(values of your current place; they
update while you move). Deny →
"Location permission denied…";
location off → "Location is OFF…".

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <application>
        <activity android:name=".MainActivity" android:exported="true">
            <intent-filter>

Output

WHERE AM I? After allowing location,
"Finding address…" changes to the
address of your current place, e.g.
Near Shivaji Chowk, Nanded,
Maharashtra 431601, India

City: Nanded
PIN: 431601
State: Maharashtra

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.INTERNET" />
    <application>
        <activity android:name=".MainActivity" android:exported="true">

Output

"Distance to Government Polytechnic,
Pune", a big "—", CHECK DISTANCE and
SHOW ROUTE IN MAPS. After allowing
location, the number shows e.g. "3.4
km" (straight-line distance from
where you are). SHOW ROUTE opens
Google Maps with directions to the
college.

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <application>
        <activity android:name=".MainActivity" android:exported="true">
            <intent-filter>

🎤 Viva questions (5)

Q. Which permissions are needed for location?: A. ACCESS_FINE_LOCATION (precise) and/or ACCESS_COARSE_LOCATION (approximate).
Q. What are location providers?: A. GPS_PROVIDER (satellites), NETWORK_PROVIDER (Wi-Fi/cell), PASSIVE_PROVIDER.
Q. What is Geocoder?: A. A class that converts coordinates to addresses (reverse geocoding) and addresses to coordinates.
Q. Why remove location updates in onPause()?: A. To stop GPS when the app is not visible and save battery.
Q. What is FusedLocationProviderClient?: A. Google Play services API that combines GPS, Wi-Fi and sensors for battery-efficient location.

Practical 29Compulsory

Navigation drawer using fragments

Aim: Build a navigation drawer that switches between fragments.

QDevelop a program to implement a navigation drawer using fragments.

Showing answer A of 3 · tap A, B or C to see the others

Output

A blue toolbar "Home" with a ☰ icon
and the centred text "🏠 Home /
Welcome to the MAD app". Tapping ☰
(or swiping from the left edge)
slides in a drawer with Home, Notes,
About. Choosing Notes closes the
drawer, the title becomes "Notes"
and the screen shows "📒 Notes / Unit
1 to Unit 6". Back closes an open
drawer first.

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <application>
        <activity android:name=".MainActivity" android:exported="true" android:theme="@style/Theme.MaterialComponents.Light.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />

Output

A green toolbar "Dashboard" with a
menu icon, and two cards: "Next
lecture: MAD · 10:00 AM · Lab 3" and
"Micro project review on Friday".
The drawer has a green header
(avatar, "Sneha Patil", "CO6I · Roll
21"), Dashboard, Attendance and,
under "Account", Logout.
Attendance shows a bar about 85%
full and "41 / 48 lectures (85%)".
Logout shows Toast "Logged out".

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <application>
        <activity android:name=".MainActivity" android:exported="true" android:theme="@style/Theme.MaterialComponents.Light.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />

Output

A purple toolbar "MAD · Unit 1" with
☰ and the list "Unit 1 topics: ✓
What is Android ✓ Android
architecture ✓ Android Studio ✓
AVD". The drawer lists Unit 1–4.
Opening Unit 3 then Unit 4 and
pressing Back shows Unit 3 again,
then Unit 1, then the app closes.

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <application>
        <activity android:name=".MainActivity" android:exported="true" android:theme="@style/Theme.MaterialComponents.Light.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />

🎤 Viva questions (5)

Q. What is a Fragment?: A. A reusable part of the UI with its own lifecycle that lives inside an activity.
Q. What is DrawerLayout?: A. A layout that holds the main content and a drawer that slides in from the side.
Q. What does ActionBarDrawerToggle do?: A. Adds and animates the hamburger icon and opens/closes the drawer.
Q. How do you replace a fragment?: A. getSupportFragmentManager().beginTransaction().replace(containerId, fragment).commit().
Q. How do you pass data to a fragment?: A. Put it in a Bundle and call setArguments(); read it with getArguments().

Practical 30

Flashlight app with permission checks

Aim: Turn the camera flash (torch) on and off safely after checking the hardware and permissions.

QDevelop a simple flashlight application with permission checks.

Showing answer A of 3 · tap A, B or C to see the others

Output

A dark screen with a large power
icon and "Torch OFF". The first
launch asks for the camera
permission. Tapping the icon turns
the phone's flash ON, the screen
turns light yellow and the text says
"Torch ON"; tapping again switches
it off. On a phone without flash:
"This device has no flash".

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-feature android:name="android.hardware.camera.flash" android:required="false" />
    <uses-permission android:name="android.permission.CAMERA" />
    <application>
        <activity android:name=".MainActivity" android:exported="true">
            <intent-filter>

Output

A large grey "SOS", a START SOS
SIGNAL toggle and the line "Flashes
· · ·  – – –  · · · (Morse code
SOS)". When started, the flash
blinks three short, three long,
three short and repeats; the SOS
text turns red while the light is
on. STOP SOS SIGNAL turns it off.

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-feature android:name="android.hardware.camera.flash" android:required="false" />
    <application>
        <activity android:name=".MainActivity" android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

Output

A "Torch" switch, a slider and a
text line. After the camera
permission:
• On a phone with brightness
  support: "Brightness levels: 5";
  switching ON lights the flash and
  moving the slider shows
  "Brightness 2 / 5" while the light
  gets dimmer/brighter.
• On other phones: "This phone
  supports only ON/OFF" and the
  slider is disabled; the switch
  still turns the torch on and off.

// FILE: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-feature android:name="android.hardware.camera.flash" android:required="false" />
    <uses-permission android:name="android.permission.CAMERA" />
    <application>
        <activity android:name=".MainActivity" android:exported="true">
            <intent-filter>

🎤 Viva questions (5)

Q. Which class turns the flashlight on?: A. CameraManager.setTorchMode(cameraId, true).
Q. How do you check if a phone has a flash?: A. PackageManager.hasSystemFeature(FEATURE_CAMERA_FLASH) or FLASH_INFO_AVAILABLE.
Q. What is a runtime permission?: A. A dangerous permission the user must allow while the app is running (Android 6+).
Q. Why turn the torch off in onStop()?: A. So it does not stay on and drain the battery after leaving the app.
Q. Which method sets torch brightness?: A. turnOnTorchWithStrengthLevel() on Android 13+.

Mobile Application Development practicals — MSBTE

Install Android Studio, create an Android Virtual Device and set up React Native

Display "Hello World" on the screen

Explore the directory structure of an Android project

App using TextView and EditText

Button, ImageButton and ToggleButton

CheckBox and RadioButton

ProgressBar

Login form using UI controls

LinearLayout and ConstraintLayout: registration form with a custom Toast

FrameLayout, TableLayout and RelativeLayout for an e-commerce app

GridView, ImageView, ScrollView and ListView for a management system

Simple calculator using GridLayout

Splash screen

Converter app: temperature, currency, volume

Countdown timer

Date Picker

Time Picker

Two activities for a login application

Explicit intent and implicit intent

Services like Bluetooth and Wi-Fi

Broadcast receiver: Airplane, Silent and Loud mode

Registration app: insert and retrieve data from a database

Authentication app using a database

MyContacts app using a database

Use the camera

SMS application

Send and receive e-mail

Location services with permission checks

Navigation drawer using fragments

Flashlight app with permission checks

Real-time Class Chat App

Put your micro project on GitHub

Save this page — everything till your final year is here

Mobile Application Development practicals — MSBTE

Install Android Studio, create an Android Virtual Device and set up React Native

Display "Hello World" on the screen

Explore the directory structure of an Android project

App using TextView and EditText

Button, ImageButton and ToggleButton

CheckBox and RadioButton

ProgressBar

Login form using UI controls

LinearLayout and ConstraintLayout: registration form with a custom Toast

FrameLayout, TableLayout and RelativeLayout for an e-commerce app

GridView, ImageView, ScrollView and ListView for a management system

Simple calculator using GridLayout

Splash screen

Converter app: temperature, currency, volume

Countdown timer

Date Picker

Time Picker

Two activities for a login application

Explicit intent and implicit intent

Services like Bluetooth and Wi-Fi

Broadcast receiver: Airplane, Silent and Loud mode

Registration app: insert and retrieve data from a database

Authentication app using a database

MyContacts app using a database

Use the camera

SMS application

Send and receive e-mail

Location services with permission checks

Navigation drawer using fragments

Flashlight app with permission checks

2 micro projects with full code and output

Put your micro project on GitHub

Save this page — everything till your final year is here