android - 如何打破 CountDownTimer

Question

我是 android 的新手，我遇到了一个问题。

这是我的问题:我正在运行 CountDownTimer 30 秒，间隔为 5 秒。当它运行时，我为每个间隔做一个 Activity 。如果 Activity 返回肯定结果，我将停止计时器。如果计时器结束，我将宣布它失败。我尝试了很多方法，但我无法完成我需要的。

我不知道如何使用 CountDownTimer 或 Timer？也许你这样做？

这是我的代码:

    public void StartTimeOutTimer() {
    countDown timer = new countDown(30000, 5000);
    timer.start();
    }

    public class countDown extends CountDownTimer{
    ProgressDialog pd;

    public countDown(long millisInFuture, long countDownInterval) {
        super(millisInFuture, countDownInterval);
        pd = ProgressDialog.show(Activity_MapMain.this, "",
                "Loading new location...", true, false);
    }

    @Override
    public void onTick(long millisUntilFinished) {
                     //Do an activity get new location
                     //if OK stop CountDownTimer ; 
    }

    @Override
    public void onFinish() {
        pd.cancel();
    }
   }

Answer 1

尝试改用 Handler。类似这样的事情:

Handler handler;
boolean result;

@Override
public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    handler = new Handler();
    handler.post(timerRunnable);
}


Runnable timerRunnable = new Runnable() {
    int interval = 5000, period = 30000;
    int count;
    @Override
    public void run() {
        if (!result && count < period ) {
            count += interval;
            //call to the  activity get new location with startActivityForResult()
            handler.postDelayed(this, interval);
        }
    }
};



@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode == RESULT_OK){
       result = true;
    }
}

编辑如何为结果启动 Activity:

首先定义字段:

private final int CODE_NEW_LOCATION = 1;

在 Rubbable 里面放这样的东西:

 startActivityForResult(new Intent(MainActivity.this, LocationActivity.class), CODE_NEW_LOCATION);

在 LocationActivity 中定义返回值:

 boolean result;
 //define the result
 setResult(Activity.RESULT_OK);