//这里是一个片段源代码,下面还有一张出错的日志,希望好心的大神解答一下,这个问题搞了一天还没有结果;
package mars.mp3player.mp3player;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
import mars.download.HttpDownloader;
import mars.model.Mp3Info;
import mars.mp3player.service.DownloadService;
import mars.xml.Mp3ListContentHandle;
import android.os.Bundle;
import android.app.Activity;
import android.app.ListActivity;
import android.content.Intent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ListView;
import android.widget.SimpleAdapter;
public class Mp3ListActivity extends ListActivity {
private static final int UPDATE =1;
private static final int ABOUT =2;
private List<Mp3Info> mp3Infos =null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.remote_mp3_list);
updateListView();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
// getMenuInflater().inflate(R.menu.mp3_list, menu);
menu.add(0, UPDATE, 1, R.string.mp3list_update);
menu.add(0, ABOUT, 2, R.string.mp3list_about);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
if (item.getItemId()==UPDATE) {
//用户点击了更新按钮
//下载包含所有MP3 基本信息的xml文件中
System.out.println("选择的类别"+item.getItemId());
updateListView();//有错误
}
else if (item.getItemId()==ABOUT)
{
//用户点击了关于按钮
}
return super.onOptionsItemSelected(item);
}
private String downloadXMl(String urlStr){
HttpDownloader httpDownloader = new HttpDownloader();
String result =httpDownloader.download(urlStr);//有错误
return result;
}
private List<Mp3Info> parse(String xmlStr)
{
SAXParserFactory saxParserFactory =SAXParserFactory.newInstance();
List<Mp3Info> infos=null;
try {
XMLReader xmlReader =saxParserFactory.newSAXParser().getXMLReader();
infos =new ArrayList<Mp3Info>();
Mp3ListContentHandle mp3ListContentHandle =new Mp3ListContentHandle(infos);
xmlReader.setContentHandler(mp3ListContentHandle);
xmlReader.parse(new InputSource(new StringReader(xmlStr)));
for( Iterator iterator =infos.iterator();iterator.hasNext();)
{
Mp3Info mp3Info =(Mp3Info) iterator.next();
System.out.println(mp3Info);
}
} catch (Exception e) {
// TODO: handle exception
}
return infos;
}
private void updateListView()
{
String xml =downloadXMl("http://192.168.191.1:8080/mp3/resources.xml");//有错误
System.out.println("xml---->"+xml);//这里没有下载到!
//parse(xml);
//对xMl文件进行解析,并将解的的结果放到MP3info当中的list中去
mp3Infos =parse(xml);
SimpleAdapter simpleAdapter=buildSimpleAdapter(mp3Infos);
setListAdapter(simpleAdapter);
}
private SimpleAdapter buildSimpleAdapter(List<Mp3Info> mp3Infos){
//生成一个额list对象,并按照simple的标准,将MP3info当中的数据添加的list当中
List<HashMap<String, String>> list = new ArrayList<HashMap<String,String>>();
for (Iterator iterator = mp3Infos.iterator();iterator.hasNext();)
{
Mp3Info mp3Info = (Mp3Info) iterator.next();
HashMap<String, String> map = new HashMap<String, String>();
map.put("mp3_id",mp3Info.getId());
map.put("mp3_name",mp3Info.getMp3Name());
list.add(map);
}
//创建一个adapter对象
SimpleAdapter simpleAdapter = new SimpleAdapter(this, list, R.layout.mp3info_item, new String[]{"mp3_id","mp3_name"},new int[]{R.id.mp3_id,R.id.mp3_name});
return simpleAdapter;
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
Mp3Info mp3Info = mp3Infos.get(position);
Intent intent = new Intent ();
//将MP3info对象放入intent中
intent.putExtra("mp3info", mp3Info);
intent.setClass(this, DownloadService.class);
//启动service
startService(intent);
super.onListItemClick(l, v, position, id);
}