如何调用AsyncTask的调用Web服务之后更新列表视图 [英] How to update listview after calling Asynctask to call webservice

问题描述

我打电话一个 Web服务到的AsyncTask ，调用 Web服务我打电话一只叫方法 makeRequest（）在 doInBackground（），我得到的回应另一种方法成功（），在成功的方法，我更新列表视图

I am calling a webservice through asynctask, to call the webservice i am calling one method named makeRequest() in doInBackground(), I am getting the response in another methods success(), In success method i am updating the listview

但我得到的错误，如

android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views."

下面林加入我的code.Im调用 synctask 从活动

Here Im adding my code.Im calling synctask from activity

new MyTask(this,urlAsString,sp).execute(); 

这里是AsyncTask的类

here is the Asynctask class

class MyTask extends AsyncTask<Void, Void, Void> {
        ProgressDialog progress;

        String url;
        SharedPreferences sp;
        HomepageH2desk c;
          public MyTask(HomepageH2desk context,String url,SharedPreferences sp) {
            this.c = context;
            this.url = url;
            this.sp = sp;
            progress = new ProgressDialog(this.c);
            progress.setMessage("Loading...");
          }

          public void onPreExecute() {
            progress.show();
          }

          public Void doInBackground(Void... unused) {
             c.getTickets(url,sp);
            return null;
            //progress.setMessage("Loading...");
          }

          public void onPostExecute(Void unused) {
            progress.dismiss();
          }
        }

下面即时得到 Web服务响应

 public void success(Object result) {

     list = (ArrayList<Map<String, String>>) result;

    this.adapter.setList(list);
            this.adapter.notifyDataSetChanged();
}

列表视图没有得到更新，示值误差

listview is not getting updated and showing error

android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.

帮我解决这个问题...

Help me to solve this problem...

推荐答案

您应该更新您的列表是这样的。

You should update your List like this.

Activity_name.this.runOnUiThread(new Runnable() {

@Override
public void run() {
      list = (ArrayList<Map<String, String>>) result;
      this.adapter.setList(list);
      this.adapter.notifyDataSetChanged();
    }
});

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