我用的Android4.1的手机和Android4.2的模拟器,项目可以正常运行,没有报错,就是下载xml文件解析的数据无法正常显示到Listview中。之前用了个Thread()的可以下载解析xml,不用Thread()的话,就无法下载解析XML中数据,但是在Listview中使用Thread()又要报错了。
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == UPDATE) {
//用户点击了 更新列表 按钮
//new Thread(){
//public void run(){
updateListView();
//}
//}.start();
}
else if (item.getItemId() == ABOUT) {
//用户点击了 关于 按钮
}
return super.onOptionsItemSelected(item);
}
private SimpleAdapter buildSimpleAdapter(List<Mp3Info> mp3Infos) {
// 生成一个List对象,并按照SimpleAdapter的标准,将mp3Infos当中的数据添加到List当中去
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_name", mp3Info.getMp3Name());
map.put("mp3_size", mp3Info.getMp3Size());
list.add(map);
}
// 创建一个SimpleAdapter对象
SimpleAdapter simpleAdapter = new SimpleAdapter(this, list,
R.layout.mp3info_item, new String[] { "mp3_name", "mp3_size" },
new int[] { R.id.mp3_name, R.id.mp3_size });
// 将这个SimpleAdapter对象设置到ListActivity当中
return simpleAdapter;
}
private void updateListView() {
// 用户点击了更新列表按钮
// 下载包含所有Mp3基本信息的xml文件
String xml = downloadXML("http://59.69.26.186:8080/mp3/resources.xml");
// 对xml文件进行解析,并将解析的结果放置到Mp3Info对象当中,最后将这些Mp3Info对象放置到List当中
mp3Infos = parse(xml);
SimpleAdapter simpleAdapter = buildSimpleAdapter(mp3Infos);
setListAdapter(simpleAdapter);
}
private String downloadXML(String urlStr){
HttpDownloader httpDownloader = new HttpDownloader();
String result = httpDownloader.download(urlStr);
return result;
}
private List<Mp3Info> parse(String xmlStr){
SAXParserFactory saxParserFactory = SAXParserFactory.newInstance();
List<Mp3Info> infos = new ArrayList<Mp3Info>();
try {
XMLReader xmlReader = saxParserFactory.newSAXParser().getXMLReader();
Mp3ListContentHandler mp3ListContentHandler = new Mp3ListContentHandler(infos);
xmlReader.setContentHandler(mp3ListContentHandler);
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
e.printStackTrace();
}
return infos;
}
}