在处理程序中重复调用asynctask并更新UI挂起​​应用程序

Question

我试图在处理程序中重复调用asynctask并更新适配器，但它会挂起UI。现在我很困惑所以请告诉我如何重复调用asynctask和upd UI.I已确保asynctask只调用一次，直到它没有得到flagAsync的帮助完成。 处理程序代码如下。

  private void RefreshData() {

         mHandler = new Handler(Looper.getMainLooper());

            // Create runnable for posting
            mUpdateResults = new Runnable() {
                public void run() {

                    InsideHandler();

                }

            };

            int delay = 500;

            int period = 500;

            Timer timer = new Timer();

            timer.scheduleAtFixedRate(new TimerTask() {

                public void run() {

                    mHandler.post(mUpdateResults);

                }

            }, delay, period);

        }

在Handler中调用Asynctask - 代码在 -

之下

   private void InsideHandler() {

    if(aController.isNetworkAvailable() && flagAsync == 0)
            {

                flagAsync =1;

         adapter.setNotifyOnChange(false);
                    MsgList.clear();
                    MsgList.addAll(db.getMsgList(teacherId));
                    adapter.notifyDataSetChanged();


           PostMsgData(strUrl, strJson);

                        if (Build.VERSION.SDK_INT>= Build.VERSION_CODES.HONEYCOMB)
                            postDataAsyn.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
                        else
                            postDataAsyn.execute();

    }
        }

 private void PostMsgData(final String strUrl, final String strJson) {



        postDataAsyn = new AsyncTask<String, String, String>() {

            @Override
            protected void onPreExecute() {
                super.onPreExecute();


            }

            protected String doInBackground(String... args) {

                Thread.currentThread().setPriority(Thread.MAX_PRIORITY);


                try {
                    HttpURLConnection httpcon = (HttpURLConnection) ((new URL(strUrl).openConnection()));
                    httpcon.setDoOutput(true);
                    httpcon.setRequestProperty("Content-Type", "application/json");
                    httpcon.setRequestProperty("Accept", "application/json");
                    httpcon.setRequestMethod("POST");
                    httpcon.connect();

                    byte[] outputBytes = strJson.getBytes("UTF-8");
                    OutputStream os = httpcon.getOutputStream();
                    os.write(outputBytes);

                    os.close();

                    int responseCode = httpcon.getResponseCode();

                    if(responseCode == 200)
                    {
                        InputStream inputStream = new BufferedInputStream(httpcon.getInputStream());
                        InputStreamReader inputStreamReader = new InputStreamReader(
                                inputStream);

                        BufferedReader bufferedReader = new BufferedReader(
                                inputStreamReader);

                        StringBuilder stringBuilder = new StringBuilder();

                        String bufferedStrChunk = null;

                        while ((bufferedStrChunk = bufferedReader.readLine()) != null) {
                            stringBuilder.append(bufferedStrChunk);
                        }

                        return stringBuilder.toString();

                    }
                } catch (MalformedURLException e) {


                } catch (IOException e) {

                }
                return "ERROR";

            }



            @Override
            protected void onCancelled()
            {
                super.onCancelled();

            }

            protected void onPostExecute(String result) {
            }
            }

Answer 1

  mHandler = new Handler() {
   @Override
 public void handleMessage(Message msg) {
runOnUiThread(new Runnable() {
    @Override
    public void run() {
    InsideHandler();
    }
});
  }
};

你能试试吗

Answer 2

此链接可以帮助您解决问题。建议你使用runonthreadui来处理负载。

http://www.codota.com/android/methods/android.app.Activity/runOnUiThread

不要从处理程序调用asyntask。

Answer 3

使用Haroon提供的代码并让计时器退出。使用runnable作为计时器这将解决你的问题（我希望哈哈:)）