是否已有一个秒表类，Android和为什么我的执行工作？ [英] Is there already a StopWatch class for android and why doesn't my implementation work?

问题描述

最近我看到 http://developer.android.com/reference/android /os/CountDownTimer.html 并想知道是否有相应的类秒表，因为我想告诉我的应用程序的用户多长时间，他已经试图解决这一难题。我的意思是不那么复杂编程你自己这样一个秒表。我想是这样

Lately I saw http://developer.android.com/reference/android/os/CountDownTimer.html and wondered if there is an respective class for stop watches since I want to tell the user of my App how long he's already trying to solve the puzzle. I mean it isn't that complicated to program such a stop watch on your own. I tried something like

    Runnable runnable = new Runnable() {
        @Override
        public void run() {
            while (true) {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                }
                long seconds = (System.currentTimeMillis() - t) / 1000;
                statusBar.setText(String.format("%02d:%02d", seconds / 60, seconds % 60));
            }
        }

    };
    statusBar.post(runnable);

不过，奇怪的是我的活动的布局是不是夸大了，因为我有这样的 statusBar.post（可运行）; 中的活性的研究的的onCreate 方法，即启动该应用程序后，我只看到，而不是正常的GUI白屏。

But bizarrely the layout of my activity isn't inflated anymore since I have this statusBar.post(runnable); in the end of the acitivity's onCreate method meaning that after starting the app I only see a white screen instead of the normal gui.

推荐答案

您应该使用一个天文台。

You should use a Chronometer.

但无论如何，你的code能如果从UI线程删除休眠工作。

But anyway, your code can work if you remove the sleep from UI thread.

private final Runnable mRunnable = new Runnable() {
    @Override
    public void run() {
        if (mStarted) {
            long seconds = (System.currentTimeMillis() - t) / 1000;
            statusBar.setText(String.format("%02d:%02d", seconds / 60, seconds % 60));
            handler.postDelayed(runnable, 1000L);
        }
    }

};

private Hanlder mHandler;
private boolean mStarted;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mHandler = new Handler();
}

@Override
protected void onStart() {
    super.onStart();
    mStarted = true;
    mHandler.postDealyed(runnable, 1000L);
}

@Override
protected void onStop() {
    super.onStop();
    mStarted = false;
    mHandler.removeCallbacks(mRunnable);
}

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