Android – Building a Dynamic Broadcast Receiver

package com.example.android_broadcastreceivers;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class MyReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // Check if the received action is the Airplane Mode change
        if (Intent.ACTION_AIRPLANE_MODE_CHANGED.equals(intent.getAction())) {
            
            // Get the current state (true = on, false = off)
            boolean isAirplaneModeOn = intent.getBooleanExtra("state", false);
            
            if (isAirplaneModeOn) {
                Toast.makeText(context, "✈️ Airplane Mode is ON", Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(context, "📶 Airplane Mode is OFF", Toast.LENGTH_SHORT).show();
            }
        }
    }
}

package com.example.android_broadcastreceivers;

import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

public class MainActivity extends AppCompatActivity {

    // Declare an instance of your receiver
    private MyReceiver airplaneModeReceiver = new MyReceiver();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_main);
        
        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
            return insets;
        });
    }

    @Override
    protected void onStart() {
        super.onStart();
        // Register the receiver with the specific filter
        IntentFilter filter = new IntentFilter(Intent.ACTION_AIRPLANE_MODE_CHANGED);
        registerReceiver(airplaneModeReceiver, filter);
    }

    @Override
    protected void onStop() {
        super.onStop();
        // Unregister to prevent memory leaks
        unregisterReceiver(airplaneModeReceiver);
    }
}

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Swipe down from the top of your screen\nand toggle Airplane Mode to test the Receiver!"
        android:textAlignment="center"
        android:textSize="16sp"
        android:padding="20dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>