运行code一遍遍 [英] Run code over and over

问题描述

在我的申请，我显示一个时钟的TextView ，我想实时更新。我试着像这样运行：

In my application I am showing a clock in a TextView, and I want to update it in real time. I tried to run it like this:

public void clock() {
    while(clock_on == true) {
        executeClock();
    }
}

public void executeClock() {
    TextView timeTv = (TextView) findViewById(R.id.time);
    long currentTime=System.currentTimeMillis();
    Calendar cal=Calendar.getInstance();
    cal.setTimeInMillis(currentTime);
    String showTime=String.format("%1$tI:%1$tM %1$Tp",cal);
    timeTv.setText(showTime);
}

不过，这是行不通的。

But it doesn't work.

推荐答案

请尝试：

private Handler handler = new Handler();
runnable.run();

private Runnable runnable = new Runnable() 
{

public void run() 
{
     //
     // Do the stuff
     //
     if(clock_on == true) {

             executeClock();

     }

     handler.postDelayed(this, 1000);
}
};

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