BackgroundAsyncTask在平板電腦中出現錯誤

Question

任何人都可以請幫我解決這個問題。在這裏，我從服務中下載數據，爲此我使用了後臺服務並顯示進度對話框。它在我的手機可以正常使用，但同樣的代碼，使問題在我的平板電腦：

這裏是mycode的：

public class BackgroundAsyncTaskForFirstTimeHitOrCacheExpired extends AsyncTask<String, Void, Boolean> { 
     public ProgressDialog dialog; 
     @Override 
     protected void onPreExecute() { 
      dialog = ProgressDialog.show(HomeActivity.this, "", "Downloading...", true); 
     } 

     @Override 
     protected Boolean doInBackground(String... arg0) { 

        //Download data   
       }  

     @Override 
     protected void onPostExecute(Boolean isServiceValuesFetchedSuccessfully) { 
      dialog.dismiss(); 
      //activity started 

     } 
    } 

這裏是我的logcat錯誤：

07-12 16:31:31.597: E/AndroidRuntime(2493): FATAL EXCEPTION: main 
07-12 16:31:31.597: E/AndroidRuntime(2493): java.lang.IllegalArgumentException: View not attached to window manager 
07-12 16:31:31.597: E/AndroidRuntime(2493):  at android.view.WindowManagerImpl.findViewLocked(WindowManagerImpl.java:385) 
07-12 16:31:31.597: E/AndroidRuntime(2493):  at android.view.WindowManagerImpl.removeView(WindowManagerImpl.java:230) 
07-12 16:31:31.597: E/AndroidRuntime(2493):  at android.view.Window$LocalWindowManager.removeView(Window.java:432) 
07-12 16:31:31.597: E/AndroidRuntime(2493):  at android.app.Dialog.dismissDialog(Dialog.java:290) 
07-12 16:31:31.597: E/AndroidRuntime(2493):  at android.app.Dialog.access$000(Dialog.java:78) 
07-12 16:31:31.597: E/AndroidRuntime(2493):  at android.app.Dialog$1.run(Dialog.java:123) 
07-12 16:31:31.597: E/AndroidRuntime(2493):  at android.app.Dialog.dismiss(Dialog.java:280) 
07-12 16:31:31.597: E/AndroidRuntime(2493):  at com.cpt.realtor.activity.HomeActivity$BackgroundAsyncTaskForFirstTimeHitOrCacheExpired.onPostExecute(HomeActivity.java:150) 
07-12 16:31:31.597: E/AndroidRuntime(2493):  at com.cpt.realtor.activity.HomeActivity$BackgroundAsyncTaskForFirstTimeHitOrCacheExpired.onPostExecute(HomeActivity.java:1) 
07-12 16:31:31.597: E/AndroidRuntime(2493):  at android.os.AsyncTask.finish(AsyncTask.java:417) 
07-12 16:31:31.597: E/AndroidRuntime(2493):  at android.os.AsyncTask.access$300(AsyncTask.java:127) 
07-12 16:31:31.597: E/AndroidRuntime(2493):  at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429) 
07-12 16:31:31.597: E/AndroidRuntime(2493):  at android.os.Handler.dispatchMessage(Handler.java:99) 
07-12 16:31:31.597: E/AndroidRuntime(2493):  at android.os.Looper.loop(Looper.java:123) 
07-12 16:31:31.597: E/AndroidRuntime(2493):  at android.app.ActivityThread.main(ActivityThread.java:3687) 
07-12 16:31:31.597: E/AndroidRuntime(2493):  at java.lang.reflect.Method.invokeNative(Native Method) 
07-12 16:31:31.597: E/AndroidRuntime(2493):  at java.lang.reflect.Method.invoke(Method.java:507) 
07-12 16:31:31.597: E/AndroidRuntime(2493):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842) 
07-12 16:31:31.597: E/AndroidRuntime(2493):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600) 
07-12 16:31:31.597: E/AndroidRuntime(2493):  at dalvik.system.NativeStart.main(Native Method) 

任何人都可以在這方面的幫助？ ？

在此先感謝。

Answer 1

嗨問題是相對於ProgressDialog（），它的活動開關（帶同一活動期間不隱藏進度條再次打開）。

嘗試隱藏onPause（）中的進度對話框並在onResume（）上顯示相同的內容。

Answer 2

可能是你正在傳遞一個錯誤的上下文進度對話框

dialog = ProgressDialog.show(HomeActivity.this, "", "Downloading...", true); 

你肯定HomeActivity不彎腰時，應顯示的進度dialod？

Answer 3

你可以試試這個。有時候這個問題可能是因爲進度dilog可能沒有正確初始化。不這樣做anythind相關背景與UI即使做一些嘗試，使其在runonUIthread outherwise windowleak可能發生

public class BackgroundAsyncTaskForFirstTimeHitOrCacheExpired extends AsyncTask<String, Void, Boolean> { 
      private ProgressDialog dialog; 
      @Override 
      protected void onPreExecute() { 
       dialog = new ProgressDialog(DictateActivity.this); 
       dialog.setCancelable(false); 
       dialog.setMessage("Downloadin.."); 
       dialog.show(); 
      } 

      @Override 
      protected Boolean doInBackground(String... arg0) { 

         //Download data   
        }  

      @Override 
      protected void onPostExecute(Boolean isServiceValuesFetchedSuccessfully) { 

       dialog.dismiss(); 
       //activity started 

      } 
    }