Prevent my android app starts automatically when the device/screen is sleeping/locked

Question

The problem is that if my app is running and the device (screen) is locked, the app is restarted while the device is locked (I know because I can hear the sound of my app at startup).

[Edit]

This seems very complicated. I think it would be easier to turn off sounds in the app, but I do not know how to do this only when the device is asleep:

public void playSound(int id){
    if(!DEVICE_IS_ASLEEP())
        snds[id].play(soundID[id], 1, 1, 0, 0, 1);
}

For decrease killing and restarting app you can try run Service with inside app. But this is not prevent restarting your app only decrease chance — Tapa Save, Jan 15 '15 at 07:44

snachmsm · Accepted Answer · 2015-01-15T17:42:24.167

you may registerReceiver using Context (probably inside Service)

//assuming user starting Service by press smth in app (or simple open it), so the screen will be on for sure
boolean screenOn=true;

//put this inside your onCreate
private void initBroadcasts(){
    IntentFilter filter = new IntentFilter();
    filter.addAction(Intent.ACTION_SCREEN_ON);
    filter.addAction(Intent.ACTION_SCREEN_OFF);
    filter.addAction(Intent.ACTION_USER_PRESENT);
    //new feature from API 17 - screensaver (?)
    if(android.os.Build.VERSION.SDK_INT>=17){
        filter.addAction(Intent.ACTION_DREAMING_STARTED);
        filter.addAction(Intent.ACTION_DREAMING_STOPPED);
    }

    screenOn = getScreenUnlocked();
    this.registerReceiver(screenBroadcastReceiver, filter);
}

screenBroadcastReceiver is a BroadcastReceiver as below:

private BroadcastReceiver screenBroadcastReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent myIntent) {
        if(myIntent.getAction().equals(Intent.ACTION_SCREEN_ON))
            screenOn=getScreenUnlocked();
        else if(myIntent.getAction().equals(Intent.ACTION_SCREEN_OFF))
            screenOn=false;
        else if(myIntent.getAction().equals(Intent.ACTION_USER_PRESENT))
            screenOn=true;
        else if(android.os.Build.VERSION.SDK_INT>=17){
            if(myIntent.getAction().equals(Intent.ACTION_DREAMING_STARTED))
                screenOn=false;
            else if(myIntent.getAction().equals(Intent.ACTION_DREAMING_STOPPED))
                screenOn=getScreenUnlocked();
        }
    }
};

check if screen is unlocked:

private boolean getScreenUnlocked(){
    KeyguardManager kgMgr = 
            (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
    return !kgMgr.inKeyguardRestrictedInputMode();
}

This seems very complicated. I think it would be easier to turn off sounds in the app, but I do not know how to do this only when the device is asleep: public void playSound(int id){ if(!DEVICE_IS_ASLEEP()) snds[id].play(soundID[id], 1, 1, 0, 0, 1); } — txuy, Jan 15 '15 at 17:06
just copy all above snippets to your Service or Activity and call `initBroadcasts()` in `onCreate`. if Activity still lives when screen is off (it shouldn't btw.) - locked/turned off/screensaver on - then you might pass `screenOn` boolean to your `playSound(int id, boolean screenOn)` and inside `if(screenOn){...}` — snachmsm, Jan 15 '15 at 17:40

score 0 · Answer 2 · edited May 23 '17 at 12:22

0

When configuration changes happens with app like screen lock, the activity is restarted. You will get so many answers on stackoverflow to avoid this problem like this; but according to Google Engineers, it is bad practice to retain the activity. You will get the proper answer about how to avoid this problem here

edited May 23 '17 at 12:22

Community

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answered Jan 15 '15 at 07:48

Pankaj Deshpande

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Prevent my android app starts automatically when the device/screen is sleeping/locked

2 Answers2