java - 我想每隔 5 秒更改 TextView 的文本

Question

我想每隔 5 秒更改一次 TextView 的字符串。所以我写道:

    Intent intent = getIntent();
    int kutisu = Integer.parseInt(intent.getStringExtra("kutisu"));// the number of times
    int max = Integer.parseInt(intent.getStringExtra("max"));
    int speed = 5000;// 5 seconds

    int[] sum=new int[kutisu]; // After finished count, I want to ask for a total  
    int answer = 0;
    for(int i=0;i<=kutisu;i++){
        sum[i]=new java.util.Random().nextInt(max);
        tv.setText(sum[i]); //tv is a TextView
        try {
            Thread.sleep(speed); // stop
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

但是字符串在运行时并没有改变。如何每 5 秒更改一次 TextView 的字符串？

Answer 1

使用timerTask

public void startTimer() {
//set a new Timer
timer = new Timer();
//initialize the TimerTask's job --> change yourView text data
initializeTimerTask();
//schedule the timer, after the first 5000ms the TimerTask will run every 10000ms
timer.schedule(timerTask, 5000, 10000); //
}

你也可以使用postDelayed，要让它以5秒的间隔连续运行，你需要调用postDelayed作为嵌套再次使用您的 Run 方法

handler.postDelayed(new Runnable() {

  public void run() {
    Log.d("MyActivity", "Ding Ding");
     // --> change yourView text data
    //calling postdelayed again
    handler.postDelayed(this, 5000); //added this line
  }
}, 5000);