重复延迟任务n次

Question

我想运行部分代码 n 次，延迟几秒。

这是我的代码：

 Runnable runnable = new Runnable() {
        @Override
        public void run() {
            Log.e("myLog","Runnable()-->Run()");
               // do a task here
        }
    };

Handler handler = new Handler();
    // loop repeating task 6 times
    for (int count = 0; count < 6; count++){
        Log.e("Log","Task loop "+count);

        handler.postDelayed(runnable, 20000);    // run task after 20 seconds
    }

问题：for 循环运行并发执行所有任务。我要运行一个接一个延迟任务

我在 post 找到了答案：- Repeat a task with a time delay?

但它会无限次地重复作业。

我发现我的问题非常符合逻辑：-

但看起来与我无关

Answer 1

你可以试试这个，

        int n=0;
        myHandler=new Handler();
        myRunnable=new Runnable() {
            @Override
            public void run() {
                //do your task
                n++;
                if(n<=count)
                    myHandler.postDelayed(this,2000);


            }
        };
        myRunnable.run();

Answer 2

// Instance variable

private int counter = 0;
private int maxCounter = 6;

createTask(){
    if(counter<maxCount){
        counter++;
        handler.postDelayed(runnable, 20000);
    }
}


Runnable runnable = new Runnable() {
        @Override
        public void run() {
            Log.e("myLog","Runnable()-->Run()");
               // do a task here

               createTask();
            } catch (IOException e) {
                Log.e("myLog "+e.toString());
            }
        }
    };

Answer 3

 import java.util.Timer;
 import java.util.TimerTask;
 import java.util.concurrent.TimeUnit;
 class RepeatableTask extends TimerTask{
    int repeats;
    Timer time;
    public RepeatableTask(int repeats){
        this.repeats=repeats;
    }
    void init(){
        time = new Timer();
        time.schedule(this,0,TimeUnit.MINUTES.toMillis(delayInMinutes));
    }
    void stop(){
        time.cancel();
    }
    void run(){
        if(repeats == 0){stop();}
        new Thread->{
            //task
        }
        repeats--;
    }
}

//usage
RepeatableTask taskObject = new RepeatableTask(5);
taskObject.init();

重复延迟任务n次

Repeat delayed task n times

java

android

postdelayed