Android：修改计时器中的 XML 元素

发布于 2024-10-05 13:50:38 字数 795 浏览 3 评论 0原文

我试图有一个计数器（计算秒和分钟）并每秒在显示屏上更新它。

我的类的 onCreate 中有此代码，它扩展了 Activity：

timeOnCall = (TextView) findViewById(R.id.time);
minutes = seconds = 0;
timeOnCall.setText(minutes + ":" + seconds);

// Implements the timer
Timer timer = new Timer();
timer.scheduleAtFixedRate(new TimerTask() {
    public void run() {
        ++seconds;
        if (seconds == 60) {
            seconds = 0;
            ++minutes;
        }
        // Display the new time
        timeOnCall.setText(minutes + ":" + seconds);
    }
}, 1000, 1000);

不幸的是，我收到以下错误：

android.view.ViewRoot$CalledFromWrongThreadException: 只有创建视图层次结构的原始线程才能触摸其视图。

我不知道如何解决这个问题，因为它已经在 onCreate() 方法中。有谁知道解决方案吗？

原文

I am trying to have a counter (count seconds and minutes) and update it on the display every second.

I have this code in the onCreate of my class, which extends Activity:

timeOnCall = (TextView) findViewById(R.id.time);
minutes = seconds = 0;
timeOnCall.setText(minutes + ":" + seconds);

// Implements the timer
Timer timer = new Timer();
timer.scheduleAtFixedRate(new TimerTask() {
    public void run() {
        ++seconds;
        if (seconds == 60) {
            seconds = 0;
            ++minutes;
        }
        // Display the new time
        timeOnCall.setText(minutes + ":" + seconds);
    }
}, 1000, 1000);

Unfortunately, I get the following error:

android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.

I am not sure how to fix this as it's already in the onCreate() method. Does anyone know a solution?

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謌踐踏愛綪 2024-10-12 13:50:38

您可以使用处理程序来完成此操作，例如：

final Handler mHandler = new Handler();
final Runnable updateText = new Runnable() {
    public void run() {
        timeOnCall.setText(minutes + ":" + seconds);
    }
};

在 onCreate 中您可以运行：

onCreate(Bundle b) {
...
    Timer timer = new Timer();
    timer.scheduleAtFixedRate(new TimerTask() {
        public void run() {
            ++seconds;
            if (seconds == 60) {
                seconds = 0;
                ++minutes;
            }

            // Display the new time
        mHandler.post(updateText);
        }
    }, 1000, 1000);
}

You can do it with a handler, something lite this:

final Handler mHandler = new Handler();
final Runnable updateText = new Runnable() {
    public void run() {
        timeOnCall.setText(minutes + ":" + seconds);
    }
};

in onCreate you can then run:

onCreate(Bundle b) {
...
    Timer timer = new Timer();
    timer.scheduleAtFixedRate(new TimerTask() {
        public void run() {
            ++seconds;
            if (seconds == 60) {
                seconds = 0;
                ++minutes;
            }

            // Display the new time
        mHandler.post(updateText);
        }
    }, 1000, 1000);
}

回复收藏 0 原文

画中仙 2024-10-12 13:50:38

这是因为您试图从不同的线程内部更改文本视图。你不能那样做。您需要将消息发布回拥有文本视图的线程。

public void run()

这将启动一个与运行 UI 的线程分开的新线程。

编辑：网上有大量您正在寻找的代码的示例。只需谷歌“Android 线程消息处理程序”之类的东西即可。

Its because your trying to change the textview from inside a different thread. You can't do that. You need to post a message back to the thread that owns the textview.