Android线程不会停止运行

发布于 2024-11-08 02:27:00 字数 1735 浏览 0 评论 0原文

我有一个执行 Web 请求的基本异步任务。该线程不包含在循环或任何其他内容中，它执行请求并从 run() 返回。当我尝试使用该线程执行另一个请求时，我会抛出异常，因为该线程已经在运行。我在这个网站上搜索了很多答案，但似乎出现的只是停止循环中的线程，基本上是强制线程返回。

我是否应该将线程中的请求代码放入一个循环中，等待主线程中的某种标志来告诉它继续并再次执行？像：

public void run()
{
    while ( threadIsStillRunning )
    {
        while ( !threadShouldExecute )
        {
            //Sleep the thread
        }
        //Execute the request

    }
}

编辑：好的，这是线程（它包含在我的类对象之一 - WebServiceHelper 中）：

private Thread executeRequest = new Thread()
{
    public void run()
    {
        //Meat of the code
        isRunning = false;
    }
}

然后我在同一个类中拥有另一个类方法（WebServiceHelper）：

private volatile boolean isRunning = false;
public void Execute(WebServiceHandler handler)
{
    while ( isRunning )
    {
        try 
        {
            Thread.sleep(1000);
        } 
        catch (InterruptedException e) 
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    isRunning = true;
    r = handler;
    executeRequest.start();
}

其中 r 只是一个接口对象，我用它来执行对该对象的回调执行请求。

然后在我的主要活动（请求线程执行的活动）中，我有这样的：

private Runnable getSiteData = new Runnable(){
    public void run(){
        mWebServiceHelper.SetMethod("GetSiteData");
        mWebServiceHelper.Execute(mySiteHelper);
    }
};

public void downloadDidFinish(List<Map<String, String>> data)
{
    // TODO Auto-generated method stub
    TeamList.StoreTeams(data );

    mHandler.post(getSiteData);
}

完成后上面的线程调用 downloadDidFinish ，然后我立即执行另一个请求，如您所见。崩溃正在发生当我尝试在 WebServiceHelper 上再次调用 Execute 并再次启动线程时。

原文

I have a basic asynchronous task that performs a web request. The thread is not contained in a loop or anything, it performs the request and returns from run(). When I try to execute another request, using that thread, I get an exception thrown because the thread is already running. I've searched around a lot on this site for answers, but all that seems to come up is stopping threads that are in a loop, basically forcing the thread to return.

Should I just put the request code in the thread into a loop that waits on some kind of flag from the main thread to tell it to go ahead and execute again? like:

public void run()
{
    while ( threadIsStillRunning )
    {
        while ( !threadShouldExecute )
        {
            //Sleep the thread
        }
        //Execute the request

    }
}

EDIT:
Ok, well here's the thread (this is contained in one of my class objects-WebServiceHelper):

private Thread executeRequest = new Thread()
{
    public void run()
    {
        //Meat of the code
        isRunning = false;
    }
}

I then have another class method in the same class(WebServiceHelper):

private volatile boolean isRunning = false;
public void Execute(WebServiceHandler handler)
{
    while ( isRunning )
    {
        try 
        {
            Thread.sleep(1000);
        } 
        catch (InterruptedException e) 
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    isRunning = true;
    r = handler;
    executeRequest.start();
}

where r is just an interface object that I use to perform callbacks to the object performing the request.

Then in my main activity (the one that requested the thread execution i have this:

private Runnable getSiteData = new Runnable(){
    public void run(){
        mWebServiceHelper.SetMethod("GetSiteData");
        mWebServiceHelper.Execute(mySiteHelper);
    }
};

public void downloadDidFinish(List<Map<String, String>> data)
{
    // TODO Auto-generated method stub
    TeamList.StoreTeams(data );

    mHandler.post(getSiteData);
}

downloadDidFinish gets called by the thread above upon completion, I then perform another request right after as you can see. The crash is happening when I try to call Execute again on the WebServiceHelper and start the thread again.

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