Question

我无法在进度对话框中看到任何进度更新。

在活动类中：

void reterieveImages()
    {
        mImageUriList=new ArrayList<String>();
        mImageUriList=Utils.fetchImages(this);
        mProgressDialog=new ProgressDialog(this);
            //progress dialog here is class level activity member
        mProgressDialog.show();
        mProgressDialog.setIndeterminate(false);
        mProgressDialog.setMessage("Processing Images..");
        mProgressDialog.setMax(100);
        mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        mProgressDialog.setCanceledOnTouchOutside(false);
        new GetImageAsyncTask(this, mImageUriList,mProgressDialog).execute();
            //passing progress dialog to async task
    }

在AsyncTask中

@Override
    protected Void doInBackground(Void... params) 
    {
    int progress_status;
    float count=imageUriList.size();
    float increment=0;
    float p=(increment/count)*100;
        for(int i=0;i<count;i++)
        {
            increment++;
            //do some operation
            p=(increment/count)*100;
            progress_status=Math.round(p);
            publishProgress(progress_status);
            Log.i(TAG, "progress value-"+progress_status);
        }   
        return null;
    }
    @Override
protected void onProgressUpdate(Integer... values) 
{
    //super.onProgressUpdate(values);
    progressDialog.setProgress(values[0]);
}

我只能看到微调器和消息“处理图像..”，我没有看到任何进度条/更新

我正在使用ActionBarSherLock，我也试过这个似乎也不起作用的解决方案here，它也只是在动作栏上显示进度微调器。我想要一个对话框来显示进度，而不是在操作栏上。

Answer 1

这里的技巧不是在活动中创建进度条，通过将Activity的上下文传递到AsyncTask来在AsyncTask中创建进度对话框，看看这里的代码

void reterieveImages()
    {
        //some method in sherlock activity 
        mImageUriList=new ArrayList<String>();
        mImageUriList=Utils.fetchImages(this);
        new GetImageAsyncTask(this, mImageUriList).execute();
        //NOT passing progress dialog to async task,just activity context
    }

在AsyncTask中

在构造函数

中

GetImageAsyncTask(Context mContext,ArrayList<String> mImageUriList)
{
    //Other intializations
    mProgressDialog=new ProgressDialog(mContext);

    mProgressDialog=new ProgressDialog(this);
        //progress dialog here is asynctask class member
    mProgressDialog.setIndeterminate(false);
    mProgressDialog.setMessage("Processing Images..");
    mProgressDialog.setMax(100);
    mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
    mProgressDialog.setCanceledOnTouchOutside(false);
}

现在onPreExecute（），显示/加载进度对话框

public void onPreExecute()
{
   //show dialog box on pre execute
   mProgressDialog.show();
}

保持doInBackground和onProgressUpdate相同

ProgressDialog不会在ActionBarSherlock中更新

1 个答案: