Android的進步，從不會的AsyncTask

Question

更新對話框我有一個進步的PreferenceFragment內部對話框，並且不更新其進度：

進度對話框下面的監聽器裏初始化

@Override 
public boolean onPreferenceClick(Preference preference) { 
    if (getString(R.string.sync).equalsIgnoreCase(preference.getKey())) { 
     String saveTitle = getString(R.string.crop__wait); 
     String saveDescription = getString(R.string.sync_is_running); 
     progressDialog = ProgressDialog.show(getActivity(), saveTitle, saveDescription, false, true); 
     progressDialog.setProgress(10); 
     progressDialog.setMax(100); 
     progressDialog.show(); 
     new SyncAsyncTask(this).execute(); 
     return true; 
    } else if (getString(R.string.changePassword).equalsIgnoreCase(preference.getKey())) { 
     ChangePasswordDialog.createDialog(getString(R.string.changePassword)).show(getActivity().getSupportFragmentManager(), "YES_NO_DIALOG"); 
     return true; 
    } 

    return true; 
} 

在這裏，我我正在更新進度對話框，但是ui沒有出現任何進展。僅顯示ProgressDialog的以下部分：標題，描述和微調器。

@Override 
    public void updateProgress(int progress) { 
     total += progress; 
     progressDialog.setProgress(total); 
     progressDialog.incrementProgressBy(total); 

    } 

奇怪的事實是，這個代碼使可見的進展：

progressDialog = new ProgressDialog (getActivity()); 
    progressDialog.setIndeterminate(false); 
    progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); 
    progressDialog.setCancelable(true); 
    progressDialog.setTitle(saveTitle); 
    progressDialog.setMessage(saveDescription); 
    progressDialog.setMax(100); 
    progressDialog.show(); 

我也張貼了異步任務的代碼，但我相信這是罰款：

import android.app.ProgressDialog; 
import android.content.Context; 
import android.os.AsyncTask; 
import android.widget.Toast; 

import java.lang.ref.WeakReference; 
import java.text.ParseException; 
import java.text.SimpleDateFormat; 
import java.util.Calendar; 
import java.util.Date; 
import java.util.List; 


public class SyncAsyncTask extends AsyncTask<Void, Integer, Boolean> { 

    private WeakReference<ISyncronizable> ref = null; 
    private final int totalCount = 21; 

    public SyncAsyncTask(ISyncronizable syncronizable) { 
     ref = new WeakReference<>(syncronizable); 
    } 

    @Override 
    protected Boolean doInBackground(Void... params) { 
     if (ref.get().getContext() != null) { 
      return synchronizeDB(ref.get().getContext()); 
     } 

     return false; 
    } 

    @Override 
    protected void onPostExecute(Boolean result) {  
     if (ref.get().getContext() != null) { 
      ref.get().finishedSyncronization(result); 
      ref.clear(); 
     } 
    } 

    @Override 
    protected void onProgressUpdate(Integer... values) { 
     ref.get().updateProgress(values[0]); 
    } 

    public boolean synchronizeDB(final Context context) { 
     Calendar cal = Calendar.getInstance(); 
     cal.set(Calendar.YEAR, 2000); 
     cal.set(Calendar.MONTH, 1); 
     cal.set(Calendar.DAY_OF_MONTH, 1); 

     SoapSyncService ss = SoapSyncService.getSoapSyncService(); 
     boolean successfullSync = true; 

     SystemSettingBean systemSettingsBean = SQLMceHelper.getDb(context).getLatestSyncDate(); 

     Date date = cal.getTime(); 
     String serverDateAndTime = ss.getServerDateAndTime(); 
     if (systemSettingsBean == null || systemSettingsBean.getDateValue() == null) { 
      systemSettingsBean = new SystemSettingBean(); 
      systemSettingsBean.setDateValue(serverDateAndTime); 

      date = cal.getTime(); 
     } else { 
      //........ 
      if (numberOfChanges == 0) { 
       return true; 
      } 
     } 
     publishProgress(1); 
//........ 
     publishProgress(5); 
     //........ 
     publishProgress(4); 
     //........ 

     publishProgress(4); 
     //........ 
     publishProgress(4); 
     //........ 

     publishProgress(4); 
     //........ 

     publishProgress(4); 
     //........ 

     publishProgress(4); 
     //........ 

     publishProgress(5); 
     //........ 

     publishProgress(5); 
     //........ 

     publishProgress(5); 
     //........ 

//  //........ 
     publishProgress(5); 
     //........ 


     publishProgress(5); 
     //........ 

     publishProgress(5); 
     //........ 
     publishProgress(5); 
     //........ 

     publishProgress(5); 
     //........ 

     publishProgress(5); 
     //........ 

     publishProgress(5); 
     //........ 

     publishProgress(5); 
     //........ 

     publishProgress(5); 
     //........ 

     publishProgress(5); 
     //........ 

     if (successfullSync) { 
      //........ 
     } 
     publishProgress(5); 
     return successfullSync; 
    } 
} 

而且接口代碼：

import android.content.Context;

public interface ISyncronizable { 

    public Context getContext(); 
    public void updateProgress(int progress); 
    public void finishedSyncronization(boolean isSuccessfullyFinished); 
} 

奇怪的是，使用此代碼的進步是明顯的：

progressDialog = new ProgressDialog (getActivity()); 
     progressDialog.setIndeterminate(false); 
     progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); 
     progressDialog.setCancelable(true); 
     progressDialog.setTitle(saveTitle); 
     progressDialog.setMessage(saveDescription); 
     progressDialog.setMax(100); 
     progressDialog.show(); 

Answer 1

問題是與你傳遞給publishProgress()值。

您已將最大值ProgressBar設置爲100，因此如果要查看進度的任何可見更改，請改爲使用10,20,30等。

因此，在您doInBackground()你會做這樣的事情：

if (successfullSync) { 
    publishProgress(100); 
    //........ 
}