Detecting whether screen is locked or not in Android

 public class ScreenOnOffReceiver extends BroadcastReceiver {

		@Override	
		public void onReceive(Context context, Intent intent)
			{
		            if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF))
			            {    
		                  Log.v("Screen mode", "Screen is in off State”); 
					//Your logic comes here whatever you want perform when screen is in off state			                  			            }
			      else
				if (intent.getAction().equals(Intent.ACTION_SCREEN_ON))
			            {
			            Log.v("Screen mode"," Screen is in on State”); 
			            //Your logic comes here whatever you want perform when screen is in on state	      
			
			            }
			}
}

 

3)IntentFilter to add actions

protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_screen);
		 IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);

		 filter.addAction(Intent.ACTION_SCREEN_OFF);
		
  }

 

4) Instantiating the “ScreenReceiver” class and register broaadcast receiver

 	 ScreenOnOffReceiver  onoffReceiver = new ScreenOnOffReceiver();
	 registerReceiver(onoffReceiver, filter);