Android判斷是否是黑屏

Android判斷是否是黑屏

public final static boolean isScreenLocked(Context c) {    

      android.app.KeyguardManager mKeyguardManager = (KeyguardManager) c.getSystemService(c.KEYGUARD_SERVICE);    
      return !mKeyguardManager.inKeyguardRestrictedInputMode();    

 }