Get visibility of Lockscreen

Question

How can I check from a Service if the KeyGuard (Lockscreen) is visible? I want to support the original and custom Lockscreens.

Answer 1

The screen locks only when the device turns the screen off.

You should extend BroadcastReceiver and implement onReceive, like this:

public class YourBroadcastReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        if (Intent.ACTION_SCREEN_OFF.equalsIgnoreCase(intent.getAction())) {
            //screen has been switched off!
        }
    }
}

Then you just have to register it and you'll start receiving events when the screen is switched off:

IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_SCREEN_OFF);
appBroadcastReceiver = new AppBroadcastReceiver(yourActivity);
registerReceiver(appBroadcastReceiver, filter);

There is an edge case where users have their device set to lock n seconds after the screen goes off, you might want to add a check in your broadcast receiver for the ACTION_SCREEN_ON and check the time between them.