android异步下载mp3文件

android的异步下载文件，即在非ui主线程之外，用新的线程下载mp3文件。达到ui主线程正常运行的状态下，异步下载文件。

考虑的实现方式有两种：1.在使用HandlerThread绑定handler，并在handler处理消息队列的（onhandlerMessage()）方法中下载mp3文件，下边是代码。

public class Mp3ListActivity extends ListActivity {private List<Map<String,String>> mplist=null;private Handler handle=null;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_mp3list);Intent intent=getIntent();List<Mp3Bean> list=(ArrayList<Mp3Bean>) intent.getSerializableExtra("list");mplist=new ArrayList<Map<String,String>>();Map<String,String> map=null;for(Mp3Bean bean:list){map=new HashMap<String,String>();map.put("id", bean.getId());map.put("name", bean.getName());map.put("ip", bean.getIp());System.out.println("id"+bean.getId()+"=====name:"+bean.getName());mplist.add(map);}ListAdapter adapter=new SimpleAdapter(this, mplist, R.layout.mp3_item, new String[]{"id","name","ip"}, new int[]{R.id.id,R.id.name,R.id.ip});setListAdapter(adapter);HandlerThread thread=new HandlerThread("down");thread.start();handle=new MyHandler(thread.getLooper());}/*  * 列表被选中 */@Overrideprotected void onListItemClick(ListView l, View v, int position, long id) {Map<String,String> map=this.mplist.get(position);Message msg=handle.obtainMessage();msg.obj=map;msg.sendToTarget();//通过handlerThread来下载文件}private class MyHandler extends Handler{public MyHandler(Looper looper) {super(looper);}/* (non-Javadoc) * @see android.os.Handler#handleMessage(android.os.Message) */@Overridepublic void handleMessage(Message msg) {Map<String,String> map=(Map<String, String>) msg.obj;String urlStr=map.get("ip");//在线程中下载文件HttpDownUtil down=new HttpDownUtil(urlStr);int a=down.downURLMp3("ova/", map.get("name"));if(a==0){Toast.makeText(Mp3ListActivity.this, "下载成功", Toast.LENGTH_LONG).show();}else if(a==1){Toast.makeText(Mp3ListActivity.this, "文件已经下载", Toast.LENGTH_LONG).show();}else{Toast.makeText(Mp3ListActivity.this, "下载错误", Toast.LENGTH_LONG).show();}}}

2.第二中实现方式是在service中启动新线程并用notification来通知用户更改ui界面的显示：

public class Mp3DownService extends Service {@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {Mp3Bean bean=(Mp3Bean) intent.getSerializableExtra("bean");//创建下载文件的线程Thread t=new Thread(new DownThread(bean));t.start();return super.onStartCommand(intent, flags, startId);}private class DownThread implements Runnable{Mp3Bean bean=null;public DownThread(Mp3Bean bean){this.bean=bean;}public void run() {String mp3UrlStr="http://192.168.1.2:8888/download/"+bean.getMp3name();HttpDown down=new HttpDown(mp3UrlStr);int a=down.downMp3("ova/", bean.getMp3name());String resault="";if(a==0){resault="文件下载成功！";}else if(a==1){resault="文件已经存在！";}else{resault="下载出错！";}//Notification来通知用户修改ui界面}}

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