对于AlertDemo类型,未定义getSystemService(String)方法

Question

我用getSystemService(String)这种方式,我希望这个活动开始振动1秒钟.但是,错误说标题

public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  mVibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
  mVibrator.vibrate(1000);
}

谢谢你的回答!

Answer 1

好吧,你需要从一个活动中调用这个方法...所以改变以上调用:

public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  mVibrator = (Vibrator) getActivity().getSystemService(Context.VIBRATOR_SERVICE);
  mVibrator.vibrate(1000);
}