为什么Progress Bar不会退出？

Question

我使用了asyncTask来发出http请求,因此我使用了进度条来指示该线程中的ongoings的进度.一切正常,直到onPostexecute()方法被调用,我已经显示了响应字符串,Logcat但我的进度条没有退出.

有类似的问题,但我没有得到问题所需的解决方案.请帮忙.

这是我的代码:

class RequestTask extends AsyncTask<String, Integer, String> {
        @SuppressWarnings("static-access")
        @Override
        protected void onPreExecute() {
            // TODO Auto-generated method stub
            super.onPreExecute();
            prgDialog=new ProgressDialog(getActivity()); 
            prgDialog.setCancelable(true);
            prgDialog.show(getActivity(), null, "Loading...");
        }

        @Override
        protected String doInBackground(String... uri) {
            HttpClient httpclient = new DefaultHttpClient();
            HttpResponse response;
            String responseString = null;
            try {
                response = httpclient.execute(new HttpGet(uri[0]));
                StatusLine statusLine = response.getStatusLine();
                if (statusLine.getStatusCode() == HttpStatus.SC_OK) {
                    ByteArrayOutputStream out = new ByteArrayOutputStream();
                    response.getEntity().writeTo(out);
                    out.close();
                    responseString = out.toString();
                } else {
                    // Closes the connection.
                    response.getEntity().getContent().close();
                    throw new IOException(statusLine.getReasonPhrase());
                }
            } catch (ClientProtocolException e) {
                // TODO Handle problems..
            } catch (IOException e) {
                // TODO Handle problems..
            }
            return responseString;
        }

        @Override
        protected void onPostExecute(String result) {
            super.onPostExecute(result);
            Log.d("result", result);
                prgDialog.dismiss();
            // Do anything with response..
        }
    }

Answer 1

你没有打电话dismiss()给ProgressDialog你认为(或想要)的实例.您创建一个ProgressDialog并将其分配给prgDialog引用仅调用:

prgDialog.show(getActivity(), null, "Loading...");

这将创建一个你不会忽略的新实例,ProgressDialog因为prgDialog指向另一个未显示的实例ProgressDialog.尝试:

protected void onPreExecute() {
    super.onPreExecute();
    prgDialog = ProgressDialog.show(getActivity(), null, "Loading...");
}

这就是为什么你应该在类上调用静态方法而不是该类的某个实例.