Android 4.0 asynctask 同时不可能

Question

我有同样的问题Running multiple AsyncTasks at the same time -- not possible?除了我使用 android 4.0 和 android:minSdkVersion="14"。

我试过他的例子，也得到了:

bar bar bar
bar bar bar
bar bar bar

编辑:

我找到了解决方案 here

而不是使用:

task.execute();

使用:

task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, null);

Answer 1

听起来像这样解释(来自 documentation ):

When first introduced, AsyncTasks were executed serially on a single background thread. Starting with DONUT, this was changed to a pool of threads allowing multiple tasks to operate in parallel. Starting with HONEYCOMB, tasks are executed on a single thread to avoid common application errors caused by parallel execution.

If you truly want parallel execution, you can invoke executeOnExecutor(java.util.concurrent.Executor, Object[]) with THREAD_POOL_EXECUTOR.