在异步任务中给出异常的进度对话框[重复]

Posted 2023-04-15

【中文标题】在异步任务中给出异常的进度对话框[重复]

【英文标题】：progress dialogue box giving exception in asynchtask [duplicate]

【发布时间】：2013-04-17 19:48:29

【问题描述】：

我正在开发一个 android 应用程序，当我关闭进度对话框时，我正在使用异步任务和后期执行方法，异常即将到来并且应用程序正在强制关闭。

异常来了：

    04-24 09:41:54.661: E/AndroidRuntime(1727): java.lang.IllegalArgumentException: View not attached to window manager
    04-24 09:41:54.661: E/AndroidRuntime(1727):     at android.view.WindowManagerImpl.findViewLocked(WindowManagerImpl.java:355)

代码：

data_insertion = new AsyncTask<Void, Void, Void>() 
  @Override
  protected void onPreExecute() 
    // TODO Auto-generated method stub             
    CommonUtility.show_PDialog(MainActivity.this);
    super.onPreExecute();
  
  @Override
  protected void onPostExecute(Void result) 
    // TODO Auto-generated method stub
    //setting alaram for refresh api 
    CommonUtility.close_PDialog(); //*getting exception on this line* 
    Intent setalaram = new Intent(MainActivity.this, SetAlaram.class);
    startService(setalaram);
    Intent i = new Intent(MainActivity.this, PlayListActivity.class);
    startActivity(i);
    MainActivity.this.finish();
    super.onPostExecute(result);
    finish();
  
  @Override
  protected Void doInBackground(Void...params) 
    // TODO Auto-generated method stub
    //some code 
  
  return null;

.execute(null, null, null); 

//and here is my close method for dilogue
public static void close_PDialog() 
  if (dialog != null && dialog.isShowing()) 
    dialog.dismiss();
  

日志输出：

04-24 09:41:54.661: E/AndroidRuntime(1727): FATAL EXCEPTION: main
04-24 09:41:54.661: E/AndroidRuntime(1727): java.lang.IllegalArgumentException: View not attached to window manager
04-24 09:41:54.661: E/AndroidRuntime(1727):     at android.view.WindowManagerImpl.findViewLocked(WindowManagerImpl.java:355)
04-24 09:41:54.661: E/AndroidRuntime(1727):     at android.view.WindowManagerImpl.removeView(WindowManagerImpl.java:200)
04-24 09:41:54.661: E/AndroidRuntime(1727):     at android.view.Window$LocalWindowManager.removeView(Window.java:432)
04-24 09:41:54.661: E/AndroidRuntime(1727):     at android.app.Dialog.dismissDialog(Dialog.java:278)
04-24 09:41:54.661: E/AndroidRuntime(1727):     at android.app.Dialog.access$000(Dialog.java:71)
04-24 09:41:54.661: E/AndroidRuntime(1727):     at android.app.Dialog$1.run(Dialog.java:111)
04-24 09:41:54.661: E/AndroidRuntime(1727):     at android.app.Dialog.dismiss(Dialog.java:268)
04-24 09:41:54.661: E/AndroidRuntime(1727):     at commonUtilities.CommonUtility.close_PDialog(CommonUtility.java:233)
04-24 09:41:54.661: E/AndroidRuntime(1727):     at com.walkover.filesharing.MainActivity$1.onPostExecute(MainActivity.java:55)
04-24 09:41:54.661: E/AndroidRuntime(1727):     at com.walkover.filesharing.MainActivity$1.onPostExecute(MainActivity.java:1)
04-24 09:41:54.661: E/AndroidRuntime(1727):     at android.os.AsyncTask.finish(AsyncTask.java:417)
04-24 09:41:54.661: E/AndroidRuntime(1727):     at android.os.AsyncTask.access$300(AsyncTask.java:127)
04-24 09:41:54.661: E/AndroidRuntime(1727):     at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429)
04-24 09:41:54.661: E/AndroidRuntime(1727):     at android.os.Handler.dispatchMessage(Handler.java:99)
04-24 09:41:54.661: E/AndroidRuntime(1727):     at android.os.Looper.loop(Looper.java:130)
04-24 09:41:54.661: E/AndroidRuntime(1727):     at android.app.ActivityThread.main(ActivityThread.java:3683)
04-24 09:41:54.661: E/AndroidRuntime(1727):     at java.lang.reflect.Method.invokeNative(Native Method)
04-24 09:41:54.661: E/AndroidRuntime(1727):     at java.lang.reflect.Method.invoke(Method.java:507)
04-24 09:41:54.661: E/AndroidRuntime(1727):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
04-24 09:41:54.661: E/AndroidRuntime(1727):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
04-24 09:41:54.661: E/AndroidRuntime(1727):     at dalvik.system.NativeStart.main(Native Method)

【问题讨论】：

CommonUtility.close_PDialog();方法的邮政编码。

请发布 logcat 输出？

如果去掉抛出异常的那一行，progressDialog是停留在屏幕上还是消失了？

“对话”对象在哪里实例化？在 show_PDialog(MainActivity.this) 里面？

@Analizer 我按照你说的做了，这次出乎意料地出现了异常，进度条也消失了。首先非常感谢，你能告诉我这个的原因..为什么会这样？？

【参考方案1】：

可能当任务结束并在其 onPostExecute 上运行时，创建它（并从中获取上下文）的 Activity 在到达 onPostExecute 时已经被销毁。

您可以保持这种方式，或者在某个地方创建一个 progressDialog 实例，以便每次您需要一个对话框时都可以使用它，并且在您的活动的 onDestroy() 方法中您可以取消它（以防发生类似情况）。