如何设置实际有效的Timer.scheduleAtFixedRate()？

Question

我正在使用Eclipse for Android.我试图做一个简短的重复计时器,有一个短暂的延迟.它将在单击TextView timerTV后启动.此代码位于onCreate方法中:

    timerTV = (TextView) findViewById(R.id.timerTV);
    timerTV.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

              Timer gameTimer = new Timer();
              TimerTask doThis;

              int delay = 5000;   // delay for 5 sec.
              int period = 1000;  // repeat every sec.
              doThis = new TimerTask() {
                public void run() {
                               Toast.makeText(getApplicationContext(), "timer is running", Toast.LENGTH_SHORT).show();
                }
              };
              gameTimer.scheduleAtFixedRate(doThis, delay, period);

每当我尝试运行它时,弹出一个"类文件编辑器",错误:"找不到源"JAR文件C:\ Program Files\Android\android-sdk\platforms\android-8\android.jar没有来源附件.您可以通过单击下面的附加源附加源:[附加源...]当我单击此按钮时,Eclipse要求我选择包含'android.jar'的位置文件夹我试图这样做,但无法一直导航到无论如何它所在的文件夹.

我认为这个问题出现在我的代码中.我一直在搜索几个小时,甚至多次复制和粘贴代码.

Answer 1

将实际的Timer(java.util.Timer)与runOnUiThread()结合使用是解决此问题的一种方法,下面是如何实现它的示例.

public class myActivity extends Activity {

private Timer myTimer;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.main);
    myTimer = new Timer();
    myTimer.schedule(new TimerTask() {
        @Override
        public void run() {
            TimerMethod();
        }

    }, 0, 1000);
}

private void TimerMethod()
{
    //This method is called directly by the timer
    //and runs in the same thread as the timer.

    //We call the method that will work with the UI
    //through the runOnUiThread method.
    this.runOnUiThread(Timer_Tick);
}

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

    //This method runs in the same thread as the UI.               

    //Do something to the UI thread here

    }
};
}

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