Android 计时器更新文本视图(UI) [英] Android timer updating a textview (UI)

问题描述

我正在使用计时器来创建秒表.定时器通过增加一个整数值来工作.然后我想通过不断更新文本视图在活动中显示这个值.

I'm using a timer to create a stop watch. The timer works by increasing a integer value. I want to then display this value in the activity by constantly updating a textview.

这是我尝试更新活动文本视图的服务中的代码:

Here's my code from the service where I try and update the activity's textview:

protected static void startTimer() {
    isTimerRunning = true; 
    timer.scheduleAtFixedRate(new TimerTask() {
        public void run() {
            elapsedTime += 1; //increase every sec
            StopWatch.time.setText(formatIntoHHMMSS(elapsedTime)); //this is the textview
        }
    }, 0, 1000);
}

我在错误的线程中更新 UI 时遇到某种错误.

I got some kind of error about updating the UI in the wrong thread.

如何调整我的代码以完成不断更新文本视图的任务?

How can I adapt my code to accomplish this task of constantly updating the textview?

推荐答案

protected static void startTimer() {
    isTimerRunning = true; 
    timer.scheduleAtFixedRate(new TimerTask() {
        public void run() {
            elapsedTime += 1; //increase every sec
            mHandler.obtainMessage(1).sendToTarget();
        }
    }, 0, 1000);
}

public Handler mHandler = new Handler() {
    public void handleMessage(Message msg) {
        StopWatch.time.setText(formatIntoHHMMSS(elapsedTime)); //this is the textview
    }
};

以上代码会起作用...

Above code will work...

注意:必须在主线程中创建处理程序，以便您可以修改 UI 内容.

Note: Handlers must be created in your main thread so that you can modify UI content.

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