异步任务进度对话框显示为时已晚

时间:2012-11-21 14:35:59

标签: android asynchronous task progressdialog

进度对话框出现,可能在异步任务完成后,在doInBackground中调用Web服务并解析xml,如果在xml中是一个更大的文件,则活动必须等待几秒钟

@Override
protected void onPreExecute(){
    super.onPreExecute();
    completed=false;
    this.progressDialog.show();

}

@Override
protected Boolean doInBackground(Integer... params) {
    t=HttpHelper.callWebService( url, soapAction,xml);
    if (t.equals("")){  
        return false;
    }
    else {
        try {
            SAXParserFactory spf = SAXParserFactory.newInstance();
            SAXParser sp = spf.newSAXParser();
            XMLReader xr = sp.getXMLReader();
            XMLHelperFile myXmlHelperFile = new XMLHelperFile();
            xr.setContentHandler(myXmlHelperFile);
            InputSource is = new InputSource(new StringReader(CallWebFile.t)); 
            xr.parse(is);
            mesaj = myXmlHelperFile.getParsedData(); 
            completed=true;
    } catch (Exception e) {
            e.printStackTrace();
        }
        return true;
    }

}

@Override
protected void onPostExecute(Boolean result) {
    super.onPostExecute(result);
    if (completed==true && progressDialog.isShowing()) progressDialog.dismiss();
}


@Override
protected void onProgressUpdate(Integer... values) {
    super.onProgressUpdate(values);


    }
}

2 个答案:

答案 0 :(得分:1)

只是一个猜测。在preExecute()

中初始化进度对话框

答案 1 :(得分:0)

您在doInBackground()

中缺少对publish {1}}的调用