Android ProgressDialog和AsyncTask在异常行为下失败

我有一个AsyncTasc，它可以打开ProgressDialog，一切都很好，但在一段时间的异常行为后，应用程序失败了。我知道，那个用户永远不会这么做。但是为了好的测试，必须尝试所有的方法

代码：

怎么了？感谢您的回答更改：

        @Override
    protected void onPostExecute(String result) {
        super.onPostExecute(result);
        mProgressDialog.dismiss();
        Log.d("onPostExecute", " in AsyncTasc");

    }

到

问题是，您试图在不检查进度对话框是否显示的情况下关闭该对话框，用户可以通过按

backKey

轻松取消该对话框

---

仍然可以通过设置为false来强制用户等待对话框。这样，back键将无效。

更改后仍然失败，但

setCancelable（）

解决了我的问题。谢谢你的解释。

04-16 21:14:21.053: E/AndroidRuntime(28767): FATAL EXCEPTION: main
04-16 21:14:21.053: E/AndroidRuntime(28767): java.lang.IllegalArgumentException: View not attached to window manager
04-16 21:14:21.053: E/AndroidRuntime(28767):    at android.view.WindowManagerImpl.findViewLocked(WindowManagerImpl.java:751)
04-16 21:14:21.053: E/AndroidRuntime(28767):    at android.view.WindowManagerImpl.removeView(WindowManagerImpl.java:474)
04-16 21:14:21.053: E/AndroidRuntime(28767):    at android.view.WindowManagerImpl$CompatModeWrapper.removeView(WindowManagerImpl.java:163)
04-16 21:14:21.053: E/AndroidRuntime(28767):    at android.app.Dialog.dismissDialog(Dialog.java:348)
04-16 21:14:21.053: E/AndroidRuntime(28767):    at android.app.Dialog$1.run(Dialog.java:139)
04-16 21:14:21.053: E/AndroidRuntime(28767):    at android.app.Dialog.dismiss(Dialog.java:333)
04-16 21:14:21.053: E/AndroidRuntime(28767):    at com.example.getusersubs.MainActivity$GetSubs.onPostExecute(MainActivity.java:82)
04-16 21:14:21.053: E/AndroidRuntime(28767):    at com.example.getusersubs.MainActivity$GetSubs.onPostExecute(MainActivity.java:1)
04-16 21:14:21.053: E/AndroidRuntime(28767):    at android.os.AsyncTask.finish(AsyncTask.java:602)
04-16 21:14:21.053: E/AndroidRuntime(28767):    at android.os.AsyncTask.access$600(AsyncTask.java:156)
04-16 21:14:21.053: E/AndroidRuntime(28767):    at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:615)
04-16 21:14:21.053: E/AndroidRuntime(28767):    at android.os.Handler.dispatchMessage(Handler.java:99)
04-16 21:14:21.053: E/AndroidRuntime(28767):    at android.os.Looper.loop(Looper.java:154)
04-16 21:14:21.053: E/AndroidRuntime(28767):    at android.app.ActivityThread.main(ActivityThread.java:4945)
04-16 21:14:21.053: E/AndroidRuntime(28767):    at java.lang.reflect.Method.invokeNative(Native Method)
04-16 21:14:21.053: E/AndroidRuntime(28767):    at java.lang.reflect.Method.invoke(Method.java:511)
04-16 21:14:21.053: E/AndroidRuntime(28767):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
04-16 21:14:21.053: E/AndroidRuntime(28767):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
04-16 21:14:21.053: E/AndroidRuntime(28767):    at dalvik.system.NativeStart.main(Native Method)

        @Override
    protected void onPostExecute(String result) {
        super.onPostExecute(result);
        mProgressDialog.dismiss();
        Log.d("onPostExecute", " in AsyncTasc");

    }

    @Override
    protected void onPostExecute(String result) {
        super.onPostExecute(result);
        if(mProgressDialog != null && mProgressDialog.isShowing()){
                mProgressDialog.dismiss();
        }
        Log.d("onPostExecute", " in AsyncTasc");

    }