public class AppLockService extends Service {  private ActivityManager am;  private KeyguardManager keyguardManager;  private LockScreenReceiver receiver;  @Override  public void onCreate() {    // TODO Auto-generated method stub    super.onCreate();    am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);    keyguardManager = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);    //注冊鎖屏廣播接收者    IntentFilter filter = new IntentFilter();    filter.addAction(Intent.ACTION_SCREEN_OFF);    receiver = new LockScreenReceiver();    registerReceiver(receiver, filter);    new Thread(){      public void run() {        //一直在監聽鎖屏動作，一旦監聽到，便執行操作        while(true){          boolean isLockScreen = keyguardManager.inKeyguardRestrictedInputMode();          /**此處可作相應操作*/        }      };    }.start();  }  private final class LockScreenReceiver extends BroadcastReceiver{    @Override    public void onReceive(Context context, Intent intent) {      tempAppLocks.clear();    }  }  @Override  public void onDestroy() {    super.onDestroy();    //取消鎖屏的廣播監聽    unregisterReceiver(receiver);  }}