java - 如何在主 UI 线程之外运行 TimerTask？

Question

我在 TimerTask 干扰应用内购买(异步任务)时遇到问题。 我对线程很弱，所以我相信它在主 UI 线程上运行，占用资源。 我如何在 UI 线程之外运行它？我已经搜索并尝试了一些使用处理程序的建议。但似乎我得到了相同的结果，应用程序变得非常滞后。 当我不运行此任务(每 500 毫秒刷新一次)时， Activity 运行平稳，并且在应用内购买期间没有挂起。 感谢您的帮助，代码 fragment 如下:

公共(public)类 DummyButtonClickerActivity 扩展 Activity {

        protected Timer timeTicker = new Timer("Ticker");
        private Handler timerHandler = new Handler();
        protected int timeTickDown = 20;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.mainhd);

    // start money earned timer handler
    TimerTask tick = new TimerTask() {
        public void run() {
            myTickTask();
        }
    }; 

    timeTicker.scheduleAtFixedRate(tick, 0, 500); // 500 ms each


} // End OnCreate



protected void myTickTask() {

    if (timeTickDown == 0) {

        /// run my code here
        //total = total + _Rate;





        timerHandler.post(doUpdateTimeout);
}
      else if(timeTickDown < 0) {
        // do nothing
    }

    timeTickDown--;

}

private Runnable doUpdateTimeout = new Runnable() {
    public void run() {

        updateTimeout();
    }
};



private void updateTimeout() {

    // reset tick
    timeTickDown = 2; // 2* 500ms == once a second



}

Answer 1

您可以使用 HandlerThread 来在单独的线程上运行您的处理程序

文档:

 Handy class for starting a new thread that has a looper.
 The looper can then be used to create handler classes. Note that start() must still be called.

示例:

     HandlerThread mHandlerThread = new HandlerThread("my-handler");
     mHandlerThread.start();
     Handler mHandler = new Handler(mHandlerThread.getLooper());

更新:

 private Runnable doUpdateTimeout;
private HandlerThread mHandlerThread;
private Handler timerHandler;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.mainhd);

    // start money earned timer handler
    TimerTask tick = new TimerTask() {
        public void run() {
            myTickTask();
        }
    }; 

    mHandlerThread = new HandlerThread("my-handler");
    mHandlerThread.start();

    timerHandler = new Handler(mHandlerThread.getLooper());
    doUpdateTimeout = new Runnable() {
        public void run() {

            updateTimeout();
        }
    };

    timeTicker.scheduleAtFixedRate(tick, 0, 500); // 500 ms each


} // End OnCreate



protected void myTickTask() {

    if (timeTickDown == 0) {

        /// run my code here
        //total = total + _Rate;

        timerHandler.post(doUpdateTimeout);
}
      else if(timeTickDown < 0) {
        // do nothing
    }

    timeTickDown--;

}





private void updateTimeout() {

    // reset tick
    timeTickDown = 2; // 2* 500ms == once a second

}
}

当你想从不同的线程更新 TextView 时

调用这个:

YOU_ACITIVITY_CLASS.this.runOnUiThread(new Runnable() {

        @Override
        public void run() {
            //update here

        }
    });