如何在AlertDialog後顯示ProgressDialog

Question

我遇到了無法隱藏的警報對話框的問題。

當用戶按下一個按鈕，我證明與此代碼創建一個對話框：

new AlertDialog.Builder(this) 
      .setTitle(R.string.enterPassword)     
      .setView(textEntryView)   
      .setPositiveButton(R.string.ok, 
        new DialogInterface.OnClickListener() { 
         public void onClick(DialogInterface dialog, int whichButton) { 
          String password = pwdText.getText().toString(); 
          dialog.dismiss(); 
          processUserAction(password,targetUri); 
         } 
        }) 
      .setNegativeButton(R.string.cancel, 
        new DialogInterface.OnClickListener() {      
         public void onClick(DialogInterface dialog, int whichButton) { 
          }     
         })    
      . 
      create(); 

裏有「processUserAction」的方法進行了一些沉重的操作，和裏面我使用的是AysncTask那顯示一個ProgressDialog。

我遇到的問題是，對話框提示輸入密碼永遠不會出現在屏幕上（我試過用dismiss（），cancel（））。 我想它一直呆在那裏，直到onClick方法完成。

所以，我的問題是如何關閉AlertDialog，所以我可以顯示ProgressDialog？

我一直在嘗試的另一種方法是在AlertDialog中設置DismissListener並從那裏調用繁重的操作，但是我沒有運氣（它沒有被調用）。

編輯：添加的AsyncTask代碼

public class BkgCryptOperations extends AsyncTask<File,Void,Integer>{ 

    @Override 
    protected Integer doInBackground(File... files) { 
     if (files!=null && files.length > 0){ 
      File source = files[0]; 
      File target = files[1]; 
      return cryptAction.process(source,password, target); 
     } 

     return Constants.RetCodeKO; 
    } 

    CryptAction cryptAction; 
    String password; 
    ProgressDialog progressDialog; 


    public BkgCryptOperations (CryptAction cryptAction,String password,ProgressDialog progressDialog){ 
     this.cryptAction=cryptAction; 
     this.password=password; 
     this.progressDialog=progressDialog; 
    } 

    @Override 
    protected void onPreExecute() { 
     if (progressDialog!=null){ 
      progressDialog.show(); 
     } 
    } 
    protected void onPostExecute(Integer i) { 
     if (progressDialog!=null){ 
      progressDialog.dismiss(); 
     } 
    } 


} 

在此先感謝

Answer 1

這裏是一個excample我如何做到這一點：

public void daten_remove_on_click(View button) { 
     // Nachfragen 
     if (spinadapter.getCount() > 0) { 
      AlertDialog Result = new AlertDialog.Builder(this) 
        .setIcon(R.drawable.icon) 
        .setTitle(getString(R.string.dialog_data_remove_titel)) 
        .setMessage(getString(R.string.dialog_data_remove_text)) 
        .setNegativeButton(getString(R.string.dialog_no), 
          new DialogInterface.OnClickListener() { 
           public void onClick(
             DialogInterface dialogInterface, int i) { 
            // Nicht löschen 
            dialogInterface.cancel(); 
           } 
          }) 
        .setPositiveButton(getString(R.string.dialog_yes), 
          new DialogInterface.OnClickListener() { 
           public void onClick(
             DialogInterface dialogInterface, int i) { 
            String _quellenName = myCursor.getString(1); 
            deleteQuellenRecord(_quellenName); 
            zuletztGelöscht = _quellenName; 
           } 
          }).show(); 
     } else { 
      // Keine Daten mehr vorhanden 
      Toast toast = Toast.makeText(Daten.this, 
        getString(R.string.dialog_data_remove_empty), 
        Toast.LENGTH_SHORT); 
      toast.show(); 
     } 
    } 

這裏是deleteQuellenRecord的代碼：

private void deleteQuellenRecord(String _quellenName) { 
     String DialogTitel = getString(R.string.daten_delete_titel); 
     String DialogText = getString(R.string.daten_delete_text); 
     // Dialogdefinition Prograssbar 
     dialog = new ProgressDialog(this) { 
      @Override 
      public boolean onSearchRequested() { 
       return false; 
      } 
     }; 
     dialog.setCancelable(false); 
     dialog.setTitle(DialogTitel); 
     dialog.setIcon(R.drawable.icon); 
     dialog.setMessage(DialogText); 
     // set the progress to be horizontal 
     dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); 
     // reset the bar to the default value of 0 
     dialog.setProgress(0); 
     // set the maximum value 
     dialog.setMax(4); 
     // display the progressbar 
     increment = 1; 
     dialog.show(); 
     // Thread starten 
     new Thread(new MyDeleteDataThread(_quellenName)) { 
      @Override 
      public void run() { 
       try { 
        // Datensatz löschen 
        myDB.execSQL("DELETE ... ');"); 
        progressHandler 
          .sendMessage(progressHandler.obtainMessage()); 
        myDB.execSQL("DELETE ...);"); 
        // active the update handler 
        progressHandler 
          .sendMessage(progressHandler.obtainMessage()); 
        myDB.execSQL("DELETE ...;"); 
        // active the update handler 
        progressHandler 
          .sendMessage(progressHandler.obtainMessage()); 
        // Einstellung speichern 
        try { 
         settings.edit().putString("LetzteQuelle", "-1") 
           .commit(); 
        } catch (Exception ex) { 
         settings.edit().putString("LetzteQuelle", "").commit(); 
        } 

       } catch (Exception ex) { 
        // Wait dialog beenden 
        dialog.dismiss(); 
        Log.e("Glutenfrei Viewer", 
          "Error in activity MAIN - remove data", ex); // log 
                      // the 
                      // error 
       } 
       // Wait dialog beenden 
       dialog.dismiss(); 

      } 
     }.start(); 
     this.onCreate(null); 
    } 

室內用異步任務我做這種方式：

private class RunningAlternativSearch extends 
      AsyncTask<Integer, Integer, Void> { 


     final ProgressDialog dialog = new ProgressDialog(SearchResult.this) { 
      @Override 
      public boolean onSearchRequested() { 
       return false; 
      } 
     }; 



     @Override 
     protected void onPreExecute() { 
      alternativeSucheBeendet = false; 
      String DialogTitel = getString(R.string.daten_wait_titel); 
      DialogText = getString(R.string.dialog_alternativ_text); 
      DialogZweiteChance = getString(R.string.dialog_zweite_chance); 
      DialogDritteChance = getString(R.string.dialog_dritte_chance); 
      sucheNach = getString(R.string.dialog_suche_nach); 
      dialog.setCancelable(true); 
      dialog.setTitle(DialogTitel); 
      dialog.setIcon(R.drawable.icon); 
      dialog.setMessage(DialogText); 
      dialog.setOnDismissListener(new OnDismissListener() { 
       public void onDismiss(DialogInterface arg0) { 
        // TODO Auto-generated method stub 
        cancleBarcodeWorker(); 
        if (alternativeSucheBeendet==false){ 
         // Activity nur beenden wenn die Suche 
         // nicht beendet wurde, also vom User abgebrochen 
         Toast toast = Toast.makeText(SearchResult.this, SearchResult.this 
           .getString(R.string.toast_suche_abgebrochen), 
           Toast.LENGTH_LONG); 
         toast.show(); 
         myDB.close(); 
         SearchResult.this.finish(); 
        } 
       } 
      }); 
      dialog.show(); 
     } 


     ... 

Answer 2

您可以創建AlertDialog之外的聽衆，抽象出了積極的按鈕OnClickListener中的邏輯。這樣，可以通知監聽者，AlertDialog將立即被解除。然後，AlertDialog的用戶輸入的任何處理都可以獨立於AlertDialog進行。我不確定這是否是實現這一目標的最佳方式，但過去對我來說效果很好。

據我所知，我沒有看到任何明顯的問題與您的AsyncTask代碼。

public interface IPasswordListener { 
    public void onReceivePassword(String password); 
} 

IPasswordListener m_passwordListener = new IPasswordListener { 
    @Override 
    public void onReceivePassword(String password) { 
     processUserAction(password,targetUri); 
    } 
} 

public void showPasswordDialog() { 
    AlertDialog.Builder builder = new AlertDialog.Builder(this); 
    builder.setTitle(R.string.enterPassword); 
    builder.setView(textEntryView); 
    builder.setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() { 
     public void onClick(DialogInterface dialog, int whichButton) { 
      m_passwordListener.onReceivePassword(pwdText.getText().toString()); 
      dialog.dismiss(); 
     } 
    }); 
    builder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() { 
     public void onClick(DialogInterface dialog, int whichButton) { 
      dialog.cancel(); 
     } 
    }); 
    builder.show(); 
} 

Answer 3

可以顯示processUserAction（..）的代碼嗎？沒有必要包括解僱。 我做了非常類似的東西，也沒有問題...... 下面的代碼：

AlertDialog.Builder builder = new AlertDialog.Builder(this); 
    builder.setMessage("Export data.\nContinue?") 
      .setCancelable(false) 
      .setPositiveButton("Yes", 
        new DialogInterface.OnClickListener() { 
         public void onClick(DialogInterface dialog, int id) { 
          String file = getObra().getNome(); 
          d = new ProgressDialog(MenuActivity.this); 
          d.setTitle("Exporting..."); 
          d.setMessage("please wait..."); 
          d.setIndeterminate(true); 
          d.setCancelable(false); 
          d.show(); 
          export(file); 
         } 
        }) 
      .setNegativeButton("No", 
        new DialogInterface.OnClickListener() { 
         public void onClick(DialogInterface dialog, int id) { 
          dialog.cancel(); 
         } 
        }); 
    AlertDialog alert = builder.create(); 
    alert.show(); 

在出口（文件），我打開線程：

private void export(final String file) { 


    new Thread() { 
     public void run() { 
      try { 
       ExportData ede = new ExportData(
         getApplicationContext(), getPmo().getId(), 
         file); 
       ede.export(); 
       handlerMessage("Done!!"); 
      } catch (Exception e) { 
       handlerMessage(e.getMessage()); 
       System.out.println("ERROR!!!" + e.getMessage()); 
      } 
     } 
    }.start(); 
} 

在handlerMessage我駁回progressDialog和表演最後的消息。 希望它可以幫助你。