Broadcast Receiver Demo

An Android application demonstrating the use of BroadcastReceiver to detect and respond to system-level events, specifically Airplane Mode state changes.

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Introduction

This project showcases how to implement a BroadcastReceiver in Android to listen for system broadcasts. The app monitors the device's Airplane Mode status and provides real-time visual feedback when the mode is toggled on or off.

BroadcastReceivers are a fundamental Android component that allows apps to respond to system-wide broadcast announcements, making them essential for building reactive applications.

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Project Structure

Broadcast/
├── app/
│   ├── src/
│   │   └── main/
│   │       ├── java/com/example/broadcast/
│   │       │   ├── MainActivity.java      # Main UI and receiver registration
│   │       │   └── AirplaneModeReceiver.java  # Custom BroadcastReceiver
│   │       ├── res/
│   │       │   ├── layout/
│   │       │   │   └── activity_main.xml  # Main activity layout
│   │       │   └── values/
│   │       │       ├── colors.xml
│   │       │       ├── strings.xml
│   │       │       └── themes.xml
│   │       └── AndroidManifest.xml
│   └── build.gradle.kts
├── gradle/
│   └── libs.versions.toml
├── build.gradle.kts
├── settings.gradle.kts
└── README.md

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Features

Feature	Description
Real-time Detection	Instantly detects when Airplane Mode is toggled
Dynamic Registration	BroadcastReceiver registered dynamically in activity lifecycle
Visual Feedback	Displays status indicators for ON/OFF states
Manual Check	Button to manually check current Airplane Mode status
Clean UI	Modern Material Design interface

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Technologies Used

• Language: Java
• Min SDK: 24 (Android 7.0)
• Target SDK: 35
• Android Components:
  • BroadcastReceiver
  • IntentFilter
  • Settings.Global
• Libraries:
  • AndroidX AppCompat
  • Material Design Components

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How It Works

1. Registration: The app dynamically registers an IntentFilter for Intent.ACTION_AIRPLANE_MODE_CHANGED in onStart()
2. Detection: When Airplane Mode is toggled, the system broadcasts an intent
3. Response: The custom AirplaneModeReceiver receives the broadcast and updates the UI
4. Cleanup: The receiver is unregistered in onStop() to prevent memory leaks

Key Code Snippet

// Registering the BroadcastReceiver
IntentFilter filter = new IntentFilter(Intent.ACTION_AIRPLANE_MODE_CHANGED);
registerReceiver(airplaneModeReceiver, filter);

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Screenshots

Add screenshots of your app here

Airplane Mode OFF	Airplane Mode ON

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Installation

1. Clone the repository
2. Open in Android Studio
3. Sync Gradle files
4. Run on emulator or physical device

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License

This project is for educational purposes.

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Author

Ranjeet

GitHub: @Chran19

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Built for learning Android Development