如何在一定的时间间隔后重复运行一个线程 [英] How to run a thread repeatedly after some interval

问题描述

我要运行一个线程（它一些时间在后台耗时的任务，不更新UI），它只是下载了一些文件，形成了互联网，它是独立于用户界面。

I want to run a thread (Which does some time consuming task in background and does NOT update UI) it just downloads some files form the internet and it is independent from the UI.

我想一段时间间隔后重复运行这个线程。

I want to run this thread repeatedly after some time interval.

我怎样才能做到这一点，我有螺纹类似如下：

How can i do this, I have thread something like below:

boolean mResult =false;

void onCreate()
{
    DownloadThread mDownloadThread = new DownloadThread();
    mDownloadThread.start();
}

class DownloadThread extends Thread implements Runnable
{
    public void run() 
    {
       // My download code 
       mResult  = result;
    }
}

我是否需要使用处理程序实施呢？

推荐答案

选项1：

volatile boolean flag = true;

public void run() 
{
    while(flag)
    {    
       // Do your task
        try{
            Thread.Sleep(interval);
        } catch(Exception e){

        }

    }
}

选项2：

Timer timer = new Timer();
timer.scheduleAtFixedRate(new TimerTask() {

    @Override
    public void run() {
        // Do your task
    }

}, 0, interval);

选项3：

volatile boolean flag = true;

public void someMethod(){
     // Do your task
     try{
         Thread.Sleep(interval);
     } catch(Exception e){

     }
     if(flag)
        return;
     else
        someMethod();     
}

方法4：

final Handler handler = new Handler();
volatile boolean flag = true;

Class A implements Runnable{
    public void run(){
        // Do your Task
    }
    if(!flag)
       handler.postDelayed(a, interval);
}

A a = new A();

handler.postDelayed(a);

将有更多的选择。我从来没有尝试过的选项3和4，刚来到我的脑海里，我写道。如果我是你，我会使用任何1或2。

There will be many more options. I never tried option 3 and 4. It just came to my mind and I wrote. If I were you I would use any of 1 or 2.

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