Android 4.4.2 : How to turn off screen automatically

Question

After using SCREEN_ON SCREEN_OFF broadcast receiver, screen does not seem to switch off automatically as it used to for default android app.

None of the code commented below works for Android 4.4.2 (API 19 onward)

int time = android.provider.Settings.System.getInt(context.getContentResolver(), Settings.System.SCREEN_OFF_TIMEOUT, Integer.MAX_VALUE);
// Toast.makeText(context, "Screen Time out is "+new Date(lastTimeScreenOn+15000) + ", lastTimeScreenOn = "+new Date(lastTimeScreenOn), Toast.LENGTH_SHORT).show();
// screen off if more than 15 sec
if(System.currentTimeMillis() - lastTimeScreenOn > 15000)
 {
      Toast.makeText(context, "Screen Time out ", Toast.LENGTH_LONG).show();
      //DevicePolicyManager mDPM = (DevicePolicyManager)context.getSystemService(Context.DEVICE_POLICY_SERVICE);
      //mDPM.lockNow();
      //Settings.System.putInt(context.getContentResolver(), Settings.System.SCREEN_OFF_TIMEOUT, 1000);
 }

Answer 1

I have come across a similar question in this link.

It seems you should first receive admin access for the device. Then, you have to call lockNow method of DevicePolicyManager instance.

Note: I haven't tested the code my self. Please let me know if this doesn't work. I will look into what's wrong.