android - Android AsyncTask崩溃

Question

我正在扩展AsyncTask，并在我的doInBackground()中使用findViewById获得按钮 View ，并且当我调用button.performClick()时，我的应用程序崩溃了。

知道为什么吗？

这是logcat:

E/AndroidRuntime(604): FATAL EXCEPTION: AsyncTask #2
E/AndroidRuntime(604): java.lang.RuntimeException: An error occured while executing doInBackground()
E/AndroidRuntime(604):  at android.os.AsyncTask$3.done(AsyncTask.java:278)
E/AndroidRuntime(604):  at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
E/AndroidRuntime(604):  at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
E/AndroidRuntime(604):  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
E/AndroidRuntime(604):  at java.util.concurrent.FutureTask.run(FutureTask.java:137)
E/AndroidRuntime(604):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
E/AndroidRuntime(604):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
E/AndroidRuntime(604):  at java.lang.Thread.run(Thread.java:856)
E/AndroidRuntime(604): Caused by: android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
E/AndroidRuntime(604):  at android.view.ViewRootImpl.checkThread(ViewRootImpl.java:4039)
E/AndroidRuntime(604):  at android.view.ViewRootImpl.playSoundEffect(ViewRootImpl.java:3610)
E/AndroidRuntime(604):  at android.view.View.playSoundEffect(View.java:13103)
E/AndroidRuntime(604):  at android.view.View.performClick(View.java:3510)

Answer 1

I'm extending AsyncTask and in my doInBackground() I get a button view using findViewById and when I call button.performClick() my app crashes.

在AsyncTasks中，您只能使用 onProgressUpdate()， onPostExecute()或有权访问UI线程的其他方法中的UI元素(例如Button)。只需将调用 button的代码移到可接受的方法中即可。