两个不同的AsyncTasks同时执行 [英] Two different AsyncTasks execute at the same time

问题描述

我总共有两种不同的AsyncTask实现，比如说AT1和AT2.

I have two total different implementations of AsyncTask, lets say AT1 and AT2.

AT1，然后执行AT2. AT1在doInBackground中等待，直到AT2通过每500 ms轮询一次此数据来完成其任务.但这永远不会发生.

AT1 is executed first, then AT2 is executed. AT1 waits in doInBackground until AT2 has done its task by polling this data every 500 ms. But this never happens.

所以我基本上想要的是:

So what I basically want is this:

但是似乎发生了什么:
除了AT1从未完成，并且AT2从未启动.

But what seems to happen is this:
Except AT1 is never done, and AT2 is never started.

有没有办法强制这两个AsyncTask在两个单独的线程上执行，或者有其他解决方案吗?

Is there a way I can force these two AsyncTasks to be executed on two seperate threads, or is there another solution for this?

不可能首先启动AT2，然后再执行AT1.

It is not possible to first start AT2 and after that execute AT1.

编辑
为了澄清起见:AT1是在用户打开特定屏幕并需要根据位置下载该屏幕的数据时执行的. AT2在位置更改时执行，并且发生这种情况时，会进行一些无法在UI线程上执行的计算.

EDIT
For clarification: AT1 is executed when a user opens a particular screen, and needs to download data for that screen, based on a location. AT2 is executed on Location change, and when that happens, some calculations are made that cannot be done on the UI thread.

当从未执行过AT2时，AT1没有下载数据的位置，因此需要等待AT2完成.执行AT2 后，位置数据已经存在，并且AT1无需等待.

When AT2 has never been executed, AT1 has no location to download data for, so it needs to wait for AT2 to finish. When AT2 has been executed, the location data is already there, and AT1 doesn't need to wait.

此外，此问题发生在ICS中，而不是在Android 2.3中发生，例如

Also, this problem occurs in ICS, not in Android 2.3, like this answer suggests.

推荐答案

当我发布此问题时，

When I posted this question, this question appeared in the Related section. It advices to use executeOnExecutor, I've implemented this as follows:

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
    new SetLocationAsyncTask().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, location);
} else {
    new SetLocationAsyncTask().execute(location);
}

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