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Editorial Team
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Asked: 2026-06-04T13:17:21+00:00

I’m trying to register a broadcast receiver so that when the screen turns on,

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I’m trying to register a broadcast receiver so that when the screen turns on, airplane mode turns on as well. It WORKS as long as I stay in the activity where I register it, but as soon as I leave the activity, it stops working. Android Manifest is static so I can’t use that and besides, the Android Manifest method does not allow you to use SCREEN_ON because Android doesn’t want you to run a bunch of things when the screen wakes up so it has to be done by using registerReceiver AFAIK.

My activity:-

public class WakeActivity extends Activity {

IntentFilter screenon = new IntentFilter("android.intent.action.SCREEN_ON");

//Skipped a bunch of code here to keep it relevant. Remember, the broadcast receiver
//does in fact work while I'm in the activity, so the problem isn't with
//the missing code here. Still, let me know if I'm missing something.

//The following method is called within onCreate()

protected void airplane(int i) {
    Screen_On screenon_airplane = new Screen_On();
    if (i == 0) {
        screenon_airplane.airplanei = 0;
        registerReceiver(screenon_airplane, screenon);
    } else if (i == 1) {
        screenon_airplane.airplanei = 1;
        registerReceiver(screenon_airplane, screenon);
    } else if (i == -1) {
        unregisterReceiver(screenon_airplane);
    }
}
}

My Broadcast Receiver:-

public class Screen_On extends BroadcastReceiver {

public int airplanei;

@Override
public void onReceive(final Context context, Intent intent) {
    boolean isEnabled = Settings.System.getInt(
            context.getContentResolver(), Settings.System.AIRPLANE_MODE_ON,
            0) == 1;
    if (airplanei == 0) {
        if (isEnabled != false) {
            Settings.System.putInt(context.getContentResolver(),
                    Settings.System.AIRPLANE_MODE_ON, 0);
            Intent turnplaneoff = new Intent(
                    Intent.ACTION_AIRPLANE_MODE_CHANGED);
            turnplaneoff.putExtra("state", 0);
            context.sendBroadcast(turnplaneoff);
        }
    } else if (airplanei == 1) {
        if (isEnabled == false) {
            Settings.System.putInt(context.getContentResolver(),
                    Settings.System.AIRPLANE_MODE_ON, 1);
            Intent turnplaneon = new Intent(
                    Intent.ACTION_AIRPLANE_MODE_CHANGED);
            turnplaneon.putExtra("state", 1);
            context.sendBroadcast(turnplaneon);
        }
    }
}
}

LogCat Error:-

05-17 23:44:24.886: E/ActivityThread(2435): Activity com.dragonheart.autodroid.ActionActivities.WakeActivity has leaked IntentReceiver com.dragonheart.autodroid.BroadCastRecievers.Screen_On@414271b0 that was originally registered here. Are you missing a call to unregisterReceiver()?

Could the error have something to do with not telling the Broadcast Receiver what to in onPause() or onDestroy()?…Although I thought once it’s registered, it would work until unregistered, regardless of the activity…

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1 Answer

  1. Editorial Team

    I’m not sure that your broadcast receiver will work once the activity is stopped, since your receiver has been registered programmatically and not statically through manifest (since android do not let you do so).

    I’ve looked at your code trying to understand what the code does, but that’s not simple from just a couple of lines…

    But anyway, why dont you create a service in which you register the listener to the screen state? In this way the service will not stop execution, even after the activity has stopped.

    And every time the service notice the screen turn on/off you can send a message to your main activity (check documentation).

    See this previous question, with example on how to use LocalBroadcastReceiver: LINK

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