基于Android平台的音乐播放器及源代码下载

package com.gm.activity; 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 android.app.ListActivity; import android.content.Intent; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.AdapterView.OnItemClickListener; import android.widget.ListView; import android.widget.SimpleAdapter; import com.gm.model.Mp3Info; import com.gm.mp3player.service.DownloadService; import com.gm.xml.HttpDownloader; import com.gm.xml.Mp3ListContentHandler; public class RemoteMp3ListActivity extends ListActivity { private static final int UPDATE = 1; private static final int ABOUT = 2; private List<Mp3Info> mp3InfoList = null; //下载地址 private static final String URL = "http://172.16.18.123:8080/mp3/resources.xml"; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.remote_mp3_list); //使得一进入软件，就更新播放列表 updateListView(); } /** * 添加菜单 */ @Override public boolean onCreateOptionsMenu(Menu menu) { menu.add(0, UPDATE, 1, R.string.mp3list_update); menu.add(0, ABOUT, 2, R.string.mp3list_about); return super.onCreateOptionsMenu(menu); } /** * 处理Menu菜单中的按钮事情监听 * @param MenuItem * @return boolean */ @Override public boolean onOptionsItemSelected(MenuItem item) { //用户点击“更新”按钮，在ListView中显示所有mp3列表 if (item.getItemId() == UPDATE) { //更新处理ListView updateListView(); } else if (item.getItemId() == ABOUT) { } return super.onOptionsItemSelected(item); } /** * 更新ListView的方法 */ private void updateListView( ){ //根据指定路径，下载xml文件，并获得xml的字符串形式的内容 String xml = downloadXML(URL); //并获得文件内容， mp3InfoList = parse(xml); //获得simplAdapter对象 SimpleAdapter simpleAdapter = buildSimpleAdapter(mp3InfoList); setListAdapter(simpleAdapter); } /** * 创建并获得SimpleAdapter * @param List<Mp3Info> * @return SimpleAdapter对象 */ private SimpleAdapter buildSimpleAdapter(List<Mp3Info> mp3InfoList ){ //生成装载HashMap对象的List对象，按时SimpleAdapter的标准，将mp3Infos当中的数据添加到List当中去 List<HashMap<String, String>> mp3InfoHashMapList = new ArrayList<HashMap<String, String>>(); for (Iterator iterator = mp3InfoList.iterator(); iterator.hasNext();) { Mp3Info mp3Info = (Mp3Info) iterator.next(); HashMap<String,String> mp3InfoHashMap = new HashMap<String, String>(); mp3InfoHashMap.put("mp3_name", mp3Info.getMp3Name()); mp3InfoHashMap.put("mp3_size", mp3Info.getMp3Size()); mp3InfoHashMapList.add(mp3InfoHashMap); } //创建一个SimpleAdapter对象,ListView就是通过SimpleAdapter对象来迭代的 SimpleAdapter simpleAdapter = new SimpleAdapter(this,mp3InfoHashMapList,R.layout.mp3infoitem,new String[]{"mp3_name","mp3_size"},new int[]{R.id.mp3_name,R.id.mp3_size}); return simpleAdapter; } /** * 下载XML歌曲列表文件，并以字符串形式获得xml文件内容 * @param String url地址 * @return String xml文件的内容 */ private String downloadXML(String urlStr) { HttpDownloader httpDownloader = new HttpDownloader(); String result = httpDownloader.download(urlStr); return result; } /** * 按照自定义的格式解析传递进来的xml内容 * @param xmlStr * @return */ private List<Mp3Info> parse(String xmlStr) { // 创建一个SAXParserFactory SAXParserFactory mSASaxParserFactory = SAXParserFactory.newInstance(); List<Mp3Info> mp3InfoList = new ArrayList<Mp3Info>(); try { // 获得XMLReader XMLReader xmlReader = mSASaxParserFactory.newSAXParser() .getXMLReader(); // 获得我们自定义的解析xml文件用的ContentHandler Mp3ListContentHandler mp3ListContentHandler = new Mp3ListContentHandler( mp3InfoList); // 为XMLReader设置内容处理器 xmlReader.setContentHandler(mp3ListContentHandler); // 开始解析xml文件 xmlReader.parse(new InputSource(new StringReader(xmlStr))); // 迭代遍历mp3InfoList,并输出每个Mp3Info对象中的内容 for (Iterator<Mp3Info> iterator = mp3InfoList.iterator(); iterator .hasNext();) { Mp3Info mp3Info = (Mp3Info) iterator.next(); System.out.println("mp3 message------" + mp3Info); } } catch (Exception e) { e.printStackTrace(); } return mp3InfoList; } /** * ListView 中的Item对象的点击事件监听 */ @Override protected void onListItemClick(ListView l, View v, int position, long id) { //根据ListView中的Item的位置号，即mp3Info在List中的编号 Mp3Info mp3Info = mp3InfoList.get(position); //以下做的是为了使下载mp3文件的线程放到一个Service中，以防止在主线程中阻碍主线程运行 //生成Intent对象 Intent intent = new Intent(); //将Mp3Info对象存入到Intent对象中，使其传递到下一个类中 intent.putExtra("mp3Info", mp3Info); //第一个参数是启动Intent的Activity，第二个参数是被启动的类 intent.setClass(this, DownloadService.class); //启动Service,因为下载 Mp3的线程在Service中 startService(intent); super.onListItemClick(l, v, position, id); } }