AyncTask中的ProgressDialog片段（崩潰）

我想在一個具有ProgressDialog的片段中運行AsyncTask，我在其他活動中多次做了這個工作，但是當我在片段中嘗試相同時，它因爲崩潰一些內存泄漏。我知道這個原因與ProgressDialog有關，但我似乎無法弄清楚如何正確地做到這一點。AyncTask中的ProgressDialog片段（崩潰）

AsynTask：

private void startNewAsyncTask() { 
    NetCheck asyncTask = new NetCheck(); 
    asyncTask.execute(); 
} 

private class NetCheck extends AsyncTask<String, String, Boolean> 
{ 

    private ProgressDialog nDialog; 

    protected void onPreExecute(){ 
     super.onPreExecute(); 
     nDialog = new ProgressDialog(getActivity()); 
     nDialog.setTitle("Checking Network"); 
     nDialog.setMessage("Loading.."); 
     nDialog.setIndeterminate(false); 
     nDialog.setCancelable(true); 
     nDialog.show(); 
} 


    protected Boolean doInBackground(String... args){ 

     ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); 
     NetworkInfo ni = cm.getActiveNetworkInfo(); 
     if (ni != null && ni.isConnected()){ 
      try { 
       URL url = new URL("http://www.google.com"); 
       HttpURLConnection urlc = (HttpURLConnection) url.openConnection(); 
       urlc.setConnectTimeout(4000); 
       urlc.connect(); 
       if (urlc.getResponseCode() == 200){ 
        return true; 
       } 
      }catch (MalformedURLException e1){ 
       e1.printStackTrace(); 
      }catch (IOException e){ 
       e.printStackTrace(); 
      } 

     } 

     return false; 
    } 

    protected void onPostExecute(Boolean th){ 

     if(th == true){ 
      nDialog.dismiss(); 

     } 
     else{ 
      nDialog.dismiss(); 
      errorMessage.setText("Error connecting to network"); 
     } 
    }

錯誤日誌：

03-25 10:53:58.074: E/WindowManager(4549): Activity com.gmail.lucsantisf.software_project.views.ProfileView has leaked window [email protected] that was originally added here 
03-25 10:53:58.074: E/WindowManager(4549): android.view.WindowLeaked: Activity com.gmail.lucsantisf.software_project.views.ProfileView has leaked window [email protected] that was originally added here 
03-25 10:53:58.074: E/WindowManager(4549): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:418) 
03-25 10:53:58.074: E/WindowManager(4549): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:294) 
03-25 10:53:58.074: E/WindowManager(4549): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:226) 
03-25 10:53:58.074: E/WindowManager(4549): at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:151) 
03-25 10:53:58.074: E/WindowManager(4549): at android.view.Window$LocalWindowManager.addView(Window.java:547) 
03-25 10:53:58.074: E/WindowManager(4549): at android.app.Dialog.show(Dialog.java:277) 
03-25 10:53:58.074: E/WindowManager(4549): at com.gmail.lucsantisf.software_project.fragments.ProfilePhotosFragment$NetCheck.onPreExecute(ProfilePhotosFragment.java:70) 
03-25 10:53:58.074: E/WindowManager(4549): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586) 
03-25 10:53:58.074: E/WindowManager(4549): at android.os.AsyncTask.execute(AsyncTask.java:534) 
03-25 10:53:58.074: E/WindowManager(4549): at com.gmail.lucsantisf.software_project.fragments.ProfilePhotosFragment.startNewAsyncTask(ProfilePhotosFragment.java:55) 
03-25 10:53:58.074: E/WindowManager(4549): at com.gmail.lucsantisf.software_project.fragments.ProfilePhotosFragment.onCreateView(ProfilePhotosFragment.java:49) 
03-25 10:53:58.074: E/WindowManager(4549): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500) 
03-25 10:53:58.074: E/WindowManager(4549): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927) 
03-25 10:53:58.074: E/WindowManager(4549): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104) 
03-25 10:53:58.074: E/WindowManager(4549): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682) 
03-25 10:53:58.074: E/WindowManager(4549): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467) 
03-25 10:53:58.074: E/WindowManager(4549): at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:472) 
03-25 10:53:58.074: E/WindowManager(4549): at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141) 
03-25 10:53:58.074: E/WindowManager(4549): at android.support.v4.view.ViewPager.populate(ViewPager.java:1068) 
03-25 10:53:58.074: E/WindowManager(4549): at android.support.v4.view.ViewPager.populate(ViewPager.java:914) 
03-25 10:53:58.074: E/WindowManager(4549): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1436) 
03-25 10:53:58.074: E/WindowManager(4549): at android.view.View.measure(View.java:15264) 
03-25 10:53:58.074: E/WindowManager(4549): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4916) 
03-25 10:53:58.074: E/WindowManager(4549): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1390) 
03-25 10:53:58.074: E/WindowManager(4549): at android.widget.LinearLayout.measureVertical(LinearLayout.java:681) 
03-25 10:53:58.074: E/WindowManager(4549): at android.widget.LinearLayout.onMeasure(LinearLayout.java:574) 
03-25 10:53:58.074: E/WindowManager(4549): at android.view.View.measure(View.java:15264) 
03-25 10:53:58.074: E/WindowManager(4549): at android.widget.ScrollView.measureChildWithMargins(ScrollView.java:1196) 
03-25 10:53:58.074: E/WindowManager(4549): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
03-25 10:53:58.074: E/WindowManager(4549): at android.widget.ScrollView.onMeasure(ScrollView.java:318) 
03-25 10:53:58.074: E/WindowManager(4549): at android.view.View.measure(View.java:15264) 
03-25 10:53:58.074: E/WindowManager(4549): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4916) 
03-25 10:53:58.074: E/WindowManager(4549): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
03-25 10:53:58.074: E/WindowManager(4549): at android.view.View.measure(View.java:15264) 
03-25 10:53:58.074: E/WindowManager(4549): at android.widget.LinearLayout.measureVertical(LinearLayout.java:833) 
03-25 10:53:58.074: E/WindowManager(4549): at android.widget.LinearLayout.onMeasure(LinearLayout.java:574) 
03-25 10:53:58.074: E/WindowManager(4549): at android.view.View.measure(View.java:15264) 
03-25 10:53:58.074: E/WindowManager(4549): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4916) 
03-25 10:53:58.074: E/WindowManager(4549): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
03-25 10:53:58.074: E/WindowManager(4549): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2339) 
03-25 10:53:58.074: E/WindowManager(4549): at android.view.View.measure(View.java:15264) 
03-25 10:53:58.074: E/WindowManager(4549): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2131) 
03-25 10:53:58.074: E/WindowManager(4549): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1242) 
03-25 10:53:58.074: E/WindowManager(4549): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1435) 
03-25 10:53:58.074: E/WindowManager(4549): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1127) 
03-25 10:53:58.074: E/WindowManager(4549): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4606) 
03-25 10:53:58.074: E/WindowManager(4549): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:747) 
03-25 10:53:58.074: E/WindowManager(4549): at android.view.Choreographer.doCallbacks(Choreographer.java:567) 
03-25 10:53:58.074: E/WindowManager(4549): at android.view.Choreographer.doFrame(Choreographer.java:536) 
03-25 10:53:58.074: E/WindowManager(4549): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:733) 
03-25 10:53:58.074: E/WindowManager(4549): at android.os.Handler.handleCallback(Handler.java:615) 
03-25 10:53:58.074: E/WindowManager(4549): at android.os

是否有人知道我做錯了嗎？

感謝您的幫助！

來源

2014-03-25 Luciano Santis

應用程序崩潰還是隻是錯誤？ – Blackbelt

是的，它崩潰 –

然後發佈整個堆棧跟蹤 – Blackbelt

您正在從片段的onCreateView()中調用show()方法。該片段尚未通過其onResume()回調，因此它沒有有效的窗口供進度對話框使用，所以這種不匹配會導致泄漏。將AsyncTask的起始位置移動到您片段的onResume()方法中，並且應該可以解決問題。

來源

2014-03-25 11:09:40

嗨，感謝您的幫助我嘗試了您所說的：\t \t public void onResume（）{ \t \t \t super.onResume（）; \t \t startNewAsyncTask（）; \t \t \t} 但它仍然崩潰。 –

它確實解決了這個問題，我在連接管理器中遇到了另一個問題，這就是爲什麼您的解決方案一開始不工作，但後來它解決了問題。謝謝。 –

很高興你能解決這個問題！ –

AyncTask中的ProgressDialog片段（崩潰）

回答

相關問題