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(jiān)聽鎖屏動作，一旦監(jiān)聽到，便執(zhí)行操作
        while(true){
          boolean isLockScreen = keyguardManager.inKeyguardRestrictedInputMode();
          /**此處可作相應(yīng)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(jiān)聽
    unregisterReceiver(receiver);
  }
}