Unable to register broadcast receiver

Question

I am trying to detect internet connectivity using broadcast receiver I have registered broadcast receiver dynamically but when app launches it is showing error below:

 java.lang.IllegalArgumentException: Receiver not registered: com.app.qrius.ConnectivityReceiver@3240fd8

I want to redirect to another activity which shows not network message when there is no internet connection.

Below is my code:

ConnectivityReceiver.java

public class ConnectivityReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {

    ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();

    if(networkInfo != null){

        Toast.makeText(context,"On",Toast.LENGTH_SHORT).show();
    }
    else{
         Intent i = new Intent(context,Network.class);
         context.startActivity(i);
        ((Activity)context).finish();
    }
}

MainActivity.java

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    final Toolbar toolbar = findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
  
  }

    @Override
protected void onResume() {

    LocalBroadcastManager.getInstance(this).registerReceiver(
            mMessageReceiver, new IntentFilter("android.net.conn.CONNECTIVITY_CHANGE"));
    super.onResume();
}

 private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        // Get extra data included in the Intent
        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();

        if(networkInfo != null){

            Toast.makeText(context,"On",Toast.LENGTH_SHORT).show();
        }
        else{
            //  Toast.makeText(context,"Off",Toast.LENGTH_SHORT).show();
            Intent i = new Intent(context,Network.class);
            context.startActivity(i);
            ((Activity)context).finish();
        }
    }
};

}

Someone please let me know what I am doing wrong any help would be appreciated.

THANKS

Answer 1

You would need to add it to the AndroidManifest.xml

Similar to:

        <receiver
        android:name=".BatteryPowerBroadcastReceiver"
        android:enabled="true"
        android:exported="true">
        <intent-filter>
            <action android:name="android.intent.action.ACTION_POWER_CONNECTED" />
            <action android:name="android.intent.action.ACTION_POWER_DISCONNECTED" />
            <action android:name="android.intent.action.BATTERY_LOW" />
            <action android:name="android.intent.action.BATTERY_OKAY" />
            <action android:name="android.intent.action.DOCK_EVENT" />
        </intent-filter>
    </receiver>

Answer 2

You should change your activity as below for programmatically register and unregister broadcast receiver. You can use LocalBroadcastManager for this.

    public class MainActivity extends AppCompatActivity {
   
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
      }
    
    
    @Override
    protected void onResume() {
        // Register to receive messages.
        // We are registering an observer (mMessageReceiver) to receive 
        //  Intents
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");

        LocalBroadcastManager.getInstance(this).registerReceiver(
                mMessageReceiver, intentFilter);
        super.onResume();
    }
    
    @Override
    protected void onPause() {
        // Unregister since the activity is paused.
        LocalBroadcastManager.getInstance(this).unregisterReceiver(
                mMessageReceiver);
        super.onPause();
    }


    // Our handler for received Intents. This will be called whenever an Intent
    // with an action named "custom-event-name" is broadcasted.
    private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            // TODO Auto-generated method stub
            // Get extra data included in the Intent
            
            ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();

    if(networkInfo != null){

        Toast.makeText(context,"On",Toast.LENGTH_SHORT).show();
    }
    else{
         Intent i = new Intent(context,Network.class);
         context.startActivity(i);
        ((Activity)context).finish();
    }
        }

    };

}

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