How to determine if the phone is in sleep mode in code?

Question

Is there a way to determine if the Android phone is in sleep mode (black screen) in the code? I wrote a home screen widget. I do not want the widget to update when the screen is black to save battery consumption.

Thanks.

Answer 1

You can use AlarmManager to start updating your widget. When you plan your next cycle, you can determine if you need to wake up your device (otherwise do the actual task).

alarmManager.set(wakeUpType, triggerAtTime, pendingIntent); 

Answer 2

You can use a broadcast receiver with android.intent.action.SCREEN_ON and android.intent.action.SCREEN_OFF action filters

A small example:

Your receiver:

  public class ScreenOnOffReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) { // some code } if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) { // some code } } } 

Your manifest:

  <receiver android:name=".ScreenOnOffReceiver"> <intent-filter> <action android:name="android.intent.action.SCREEN_ON" /> <action android:name="android.intent.action.SCREEN_OFF" /> </intent-filter> </receiver>