android listView动态刷新

Answer 1

adapter.notifyDataSetChanged();

这个要在数据发生改变之后才调用

Answer 2

错误原因终于找到：当用AsyncHttpClient时，程序会自动新开一个线程，数据获取在一个线程，而adapter中的getCount又在另一个线程，两者的进度是无法把握的。结果很明显了
现将纠正后的代码奉献出
package com.example.fiz.myapplication;

/**

• Created by Fiz on 16/3/21.

• 和服务器进行通信
  */

import android.annotation.SuppressLint;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.os.Handler;
import android.widget.SimpleAdapter;
import com.example.fiz.myapplogin.DjangoRestClient;
import com.loopj.android.http.JsonHttpResponseHandler;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.HashMap;

import cz.msebera.android.httpclient.Header;

@SuppressLint("ValidFragment")
public class Home2 extends Fragment {

private String textString;
private Handler mHandler;
private static final String Tag = "MainActivity";
private ArrayList<HashMap<String, Object>> arrayList = new ArrayList<HashMap<String, Object>>();

public Home2(String textString) {
    this.textString = textString;
}

public static Home2 newInstance(String textString) {
    Home2 mFragment = new Home2(textString);
    return mFragment;
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.home_page, container, false);
    final ListView listView = (ListView) view.findViewById(R.id.listView);
    DjangoRestClient.get("/demo/test/?format=json",
            null, new JsonHttpResponseHandler() {
                @Override
                public void onSuccess(int statusCode, Header[] headers, JSONObject response) {
                    // If the response is JSONObject instead of expected JSONArray
                    System.out.println(response);
                    try {
                        JSONArray array = response.getJSONArray("data");
                        System.out.print("状态码" + statusCode);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }

                @Override
                public void onSuccess(int statusCode, Header[] headers, JSONArray timeline) {

                    try {
                        JSONArray secondEvent = (JSONArray) timeline;
                        for (int j = 0; j < secondEvent.length(); j++) {
                            JSONObject firstEvent = (JSONObject) timeline.get(j);
                            HashMap<String, Object> tempHashMap = new HashMap<String, Object>();
                            //新闻标题
                            String title = firstEvent.getString("title");
                            //新闻时间
                            String description = firstEvent.getString("description");
                            //新闻来源
                            String link = firstEvent.getString("link");
                            //新闻序号
                            String linkmd5id = firstEvent.getString("linkmd5id");
                            tempHashMap.put("news_title", title);
                            tempHashMap.put("news_from", link);
                            tempHashMap.put("news_judge", linkmd5id);
                            tempHashMap.put("news_time", description);
                            arrayList.add(tempHashMap);
                        }
                        final SimpleAdapter adapter = new SimpleAdapter(getActivity(), getData(), R.layout.home_page_text,
                                new String[]{"news_title", "news_from", "news_judge","news_time"},
                                new int[]{R.id.news_title, R.id.news_from, R.id.news_judge,R.id.news_time});
                        listView.setAdapter(adapter);
                        System.out.println(arrayList);

                    } catch (JSONException e) {
                        e.printStackTrace();
                    }

                }
            });

    /**
     *事件监听
     */
    listView.setOnItemClickListener(new OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            if (!arrayList.get(position).equals(null)) {
                Log.d(Tag, "THIS IS A JOKKE AA  UN FUNC  M ");

            } else {
                Log.d(Tag, "THIS IS A error are you undenstard AA  UN FUNC  M ");
            }
        }
    });

    return view;
}

/**

• getData
  */

1. ArrayList<HashMap<String, Object>> getData() {

      return arrayList;
   

   }

}