android – 如何更新线程中的listview？

概述我想从远程服务器获取一些信息并在listview中显示该数据,我已从服务器检索数据,但我不知道如何在列表视图中显示该数据, 这是我的代码,在这段代码中,我已经显示了一个包含静态数据的列表视图,并尝试通过从服务器获取的数据更新此列表视图, 我不知道在哪里更新列表视图,请任何人帮我这样做 package com.listview;import java.io.BufferedReader;imp 我想从远程服务器获取一些信息并在ListvIEw中显示该数据,我已从服务器检索数据,但我不知道如何在列表视图中显示该数据,
这是我的代码,在这段代码中,我已经显示了一个包含静态数据的列表视图,并尝试通过从服务器获取的数据更新此列表视图,

我不知道在哪里更新列表视图,请任何人帮我这样做

package com.ListvIEw;import java.io.BufferedReader;import java.io.inputStream;import java.io.inputStreamReader;import java.util.ArrayList;import org.apache.http.httpentity;import org.apache.http.httpResponse;import org.apache.http.nameValuePair;import org.apache.http.clIEnt.httpClIEnt;import org.apache.http.clIEnt.entity.UrlEncodedFormEntity;import org.apache.http.clIEnt.methods.httpPost;import org.apache.http.impl.clIEnt.DefaulthttpClIEnt;import org.Json.JsONArray;import org.Json.JsONException;import org.Json.JsONObject;import androID.app.ListActivity;import androID.net.ParseException;import androID.os.Bundle;import androID.util.Log;import androID.vIEw.VIEw;import androID.Widget.AdapterVIEw;import androID.Widget.ArrayAdapter;import androID.Widget.ListVIEw;import androID.Widget.TextVIEw;import androID.Widget.Toast;import androID.Widget.AdapterVIEw.OnItemClickListener;public class ListVIEwActivity extends ListActivity {/** Called when the activity is first created. */private ThreadTest mThreadTest;ArrayList<String > arList;public voID onCreate(Bundle savedInstanceState) {      super.onCreate(savedInstanceState);      mThreadTest=new Threadtest();             Thread tt=new Thread(mThreadTest);      tt.start();   //create a static arrayList to display it in ListvIEw      arList = new ArrayList<String>();      arList.add("xxxxxxxxxxxx");      arList.add("yyyyyyyyyyyy");      ArrayAdapter<String>  arrayAdapter = new ArrayAdapter<String>(this,R.layout.List_item,arList);      setlistadapter(arrayAdapter);       //create ListvIEw      ListVIEw lv = getListVIEw();      lv.setTextFilterEnabled(true);      lv.setonItemClickListener(new OnItemClickListener() {        public voID onItemClick(AdapterVIEw<?> parent,VIEw vIEw,int position,long ID) {// When clicked,show a toast with the TextVIEw text          Toast.makeText(getApplicationContext(),((TextVIEw) vIEw).getText(),Toast.LENGTH_SHORT).show();        }      });    }static public class ThreadTest implements Runnable{    ListVIEwActivity li=new ListVIEwActivity();                 JsONArray jArray;    String result = null;    inputStream is = null;    StringBuilder sb=null;    public  ArrayList al,arrayList;    public voID run()     {//get some details from Remote Server as Json string         ArrayList<nameValuePair> nameValuePairs = new ArrayList<nameValuePair>();        try        {            httpClIEnt httpclIEnt = new DefaulthttpClIEnt();            httpPost httppost = new httpPost("http://xxxxxxxxx/clIEnts/yyyyyy/city.PHP");            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));            httpResponse response = httpclIEnt.execute(httppost);            httpentity entity = response.getEntity();            is = entity.getContent();         }        catch(Exception e)        {            Log.e("log_tag","Error in http connection "+e.toString());        }        try{                            BufferedReader reader = new BufferedReader(new inputStreamReader(is,"iso-8859-1"),8);            sb = new StringBuilder();            sb.append(reader.readline() + "\n");            String line="0";            while ((line = reader.readline()) != null)             {                    sb.append(line  );            }            is.close();            result=sb.toString();/**************************************             * result is [{"city_ID":"1","city_name":"madurai"},{"city_ID":"2","city_name":"coimbatore"},{"city_ID":"3","city_name":"chennai"}]             *///parse the Json string values            JsONArray array = new JsONArray(result);            for (int i = 0; i < array.length(); i++)             {                JsONObject row = array.getJsONObject(i);                int ID = row.getInt("city_ID");                                 String name = row.getString("city_name");//add the cityname to arrayList to display it in ListvIEw after the thread exeucted                arrayList.add(name);                                                                }                    }        catch(Exception e)        {              Log.e("log_tag","Error converting result "+e.toString());        }    }}

}

我在http://www.sitepoint.com/loading-twitter-data-into-android-with-lists/找到了一个很好的教程来做到这一点,

解决方法 要更新UI,您应该在线程中调用UI线程,如下所示

runOnUiThread(new Runnable() {     @OverrIDe     public voID run() {            ArrayAdapter<String>  arrayAdapter = new ArrayAdapter<String>(this,arList);  setlistadapter(arrayAdapter); }  });

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