Overlay for lock screen

AndroidManifest

<activity android:name=".MainActivity"

			android:showOnLockScreen="true">
			<intent-filter>
				<action android:name="android.intent.action.MAIN" />

				<category android:name="android.intent.category.LAUNCHER" />
			</intent-filter>
		</activity>

MainActivity

@Override
	protected void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
			getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON|
				WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED |
				WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);
		setContentView(R.layout.activity_main);
	}