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在我的活动中，我正在调用 web 服务。所以在网络服务返回结果后，我必须显示一个警报。由于警报是 UI 部分，我认为在 onPostExecute() 内部我必须编写警报代码。但是当我喜欢那个错误时。

显示错误：

12-02 09:59:08.508: ERROR/AndroidRuntime(451): Uncaught handler: thread main exiting 
due to uncaught exception
12-02 09:59:08.528: ERROR/AndroidRuntime(451): 
android.view.WindowManager$BadTokenException: Unable to add window -- token 
android.app.LocalActivityManager$LocalActivityRecord@4378eb50 is not valid; is your 
activity running?
12-02 09:59:08.528: ERROR/AndroidRuntime(451):     at 
android.view.ViewRoot.setView(ViewRoot.java:456)
12-02 09:59:08.528: ERROR/AndroidRuntime(451):     at 
android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)
12-02 09:59:08.528: ERROR/AndroidRuntime(451):     at 
android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
12-02 09:59:08.528: ERROR/AndroidRuntime(451):     at 
android.view.Window$LocalWindowManager.addView(Window.java:409)
12-02 09:59:08.528: ERROR/AndroidRuntime(451):     at
android.app.Dialog.show(Dialog.java:238)
12-02 09:59:08.528: ERROR/AndroidRuntime(451):     at 
android.app.AlertDialog$Builder.show(AlertDialog.java:802)
12-02 09:59:08.528: ERROR/AndroidRuntime(451):     at    com.myapp.android.activities.Register$PostCodeTask.onPostExecute(Register.java:291)
12-02 09:59:08.528: ERROR/AndroidRuntime(451):     at     com.myapp.android.activities.Register$PostCodeTask.onPostExecute(Register.java:1)
12-02 09:59:08.528: ERROR/AndroidRuntime(451):     at
android.os.AsyncTask.finish(AsyncTask.java:416) 
12-02 09:59:08.528: ERROR/AndroidRuntime(451):     at 
android.os.AsyncTask.access$300(AsyncTask.java:127)
12-02 09:59:08.528: ERROR/AndroidRuntime(451):     at 
android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:428)
12-02 09:59:08.528: ERROR/AndroidRuntime(451):     at 
android.os.Handler.dispatchMessage(Handler.java:99)
12-02 09:59:08.528: ERROR/AndroidRuntime(451):     at 
android.os.Looper.loop(Looper.java:123)
android.app.ActivityThread.main(ActivityThread.java:4203)
12-02 09:59:08.528: ERROR/AndroidRuntime(451):     at 
java.lang.reflect.Method.invokeNative(Native Method)
12-02 09:59:08.528: ERROR/AndroidRuntime(451):     at 
java.lang.reflect.Method.invoke(Method.java:521)
12-02 09:59:08.528: ERROR/AndroidRuntime(451):     at 
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
12-02 09:59:08.528: ERROR/AndroidRuntime(451):     at 
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)
12-02 09:59:08.528: ERROR/AndroidRuntime(451):     at dalvik.system.NativeStart.main(Native 
Method)

任何人都可以请帮助解决我的问题。提前致谢 ：）

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1 回答 1

1

您需要在 UI 线程中执行警报代码。例如，有几种方法可以做到这一点

runOnUiThread(new Runnable() {
    public void run() {
        Toast.makeText(MyActivity.this, "Hello there", Toast.LENGTH_LONG).show();
    }
});
于 2010-12-03T06:10:31.213 回答