android - 进度对话框不会立即出现

当我开始一个新的活动时，我的progressDialog不会立即出现。我使用AsyncTask相同。我将在下一个活动中从Web服务加载数据。以下是我的异步类：

private class TheTask extends AsyncTask<Void, Void, Void>{

    Context con;
     Intent aboutusIntent;
     TabGroupActivity parentActivity;
    private TheTask(Context context)
    {
        this.con=context;
    }

    @Override
    protected void onPreExecute() {
        progDialog = ProgressDialog.show(con, "Loading... ",
                "please wait....", true);

    }

    @Override
    protected Void doInBackground(Void... params) {
         aboutusIntent = new Intent(con, Departments.class);
          parentActivity = (TabGroupActivity)getParent();
        //progDialog.show();
        return null;
    }

    @Override
    protected void onPostExecute(Void result) {

        parentActivity.startChildActivity("Departments", aboutusIntent);
        if(progDialog.isShowing())
        {
        progDialog.dismiss();
        }


    }

}

我正在创建此类onClick of按钮的实例：

ourdepbtn.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            new TheTask(AboutUs.this.getParent()).execute();
        }
    });

有什么建议么？

最佳答案

Handler mHandler = new Handler();// This statement is to be called by the main thread

ProgressDialog.show();// This statement is to be called by the main thread

Thread t = new Thread(
new Runnable(){

public void run()
{

  callWebServicesHereAndFetchingMethod(); //

   mHandler.post(new Runnable(){

   public void run()
   {
     ProgressDialog.dismiss();
   }
});
    }});
t.start();

关于android - 进度对话框不会立即出现，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/4790109/