Android: Overriding the power button in a Fragment

Question

I'm working on a thing where I need to override the power button in a Fragment when pressed. I did this successfully, however, the screen turns off when the power button is pressed.

I did a quick search and came across a few posts like this , this , and this . Some say it's doable and others say it's not. My question is that is this even doable? If so, any idea how to go about this?

Answer 1

You can use this to prevent screen from locking

getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);

While using in fragment

getActivity().getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);

Use a BroadcastReceiver and listen for the android.intent.action.SCREEN_OFF or Intent.ACTION_SCREEN_OFF which is sent when power button is pressed (and screen is on). What i think is that overriding the power button is not possible , because of security issues.

Answer 2

What you are doing is not advisable. However you can write a broadcast receiver and then the screen gets locked, wake it up using AlarmManager. Below is the code.

    @Override
public void onReceive(Context context, Intent intent) {
if ((intent.getAction().equals(Intent.ACTION_SCREEN_OFF))) {

PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
wakeLock = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP | PowerManager.ON_AFTER_RELEASE, "TEST");
wakeLock.acquire();

AlarmManager alarmMgr = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
Intent inten = new Intent(context,NewActivity.class);
PendingIntent pi = PendingIntent.getActivity(context, 0, inten, 0);
alarmMgr.set(AlarmManager.ELAPSED_REALTIME_WAKEUP,  100, pi);
}
}   

// Finish your WakeLock HERE. call this method after U put the activity in front or when u exit from the new activity.
public void finishWakeLocker(){
if (wakeLock != null) 
wakeLock.release();  
}

Answer 3

You cannot override the power button functionality however you can prevent system from showing dialog on long press of a power button using following.

    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        if(!hasFocus) {
           Intent closeDialog = new Intent(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
            sendBroadcast(closeDialog);
        }
    }