Android网络收音机--使用Vitamio解码（一）

前面讲到Vitamio可以支持一些流媒体，在这里就用Vitamio来播放网络上的一些流媒体，如：mms、rtsp、http，参考前辈的一些文章来写一个网络收音机程序，对于界面的要求不高，要求实现一些实用的功能

程序目录结构

初期界面，左边是用开源项目SlidingMenu，不清楚的可以参考：Android开源项目SlidingMenu的学习笔记

电台信息是通过XML来保存channel.xml，这里只添加一部分，更详细的可以参考文章最后的链接，自行添加

读取XML数据放在NetRadioApp.java，使用两个全局的变量来保存，方便其它类的使用

package com.dzt.netradio;

import java.io.InputStream;
import java.util.ArrayList;

import com.dzt.netradio.constant.GlobalConstants;
import com.dzt.netradio.domain.RadioChannelData;
import com.dzt.netradio.utils.XmlPullParserUtils;

import android.app.Application;

public class NetRadioApp extends Application {

	public static ArrayList ChannelTypeList = new ArrayList();
	public static ArrayList> finalChanneldata = new ArrayList>();

	@Override
	public void onCreate() {
		// TODO Auto-generated method stub
		super.onCreate();
		InputStream is = null;
		try {
			is = getResources().getAssets().open("channel.xml");
			XmlPullParserUtils.getRadioListData(is, ChannelTypeList,
					finalChanneldata);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			GlobalConstants.print_i("NetRadioApp",
					"onCreate Exception = " + e.toString());
			e.printStackTrace();
		}
	}

	@Override
	public void onLowMemory() {
		// TODO Auto-generated method stub
		super.onLowMemory();
		System.gc();
	}

}

在左侧菜单中使用观察者模式监听点击事件

public void setOnMenuListOnItemClickListener(
			OnMenuListOnItemClickListener listener) {
		mListener = listener;
	}

	public interface OnMenuListOnItemClickListener {

		public void onSelectItem(int groupPosition, int childPosition);
	}

	@Override
	public boolean onChildClick(ExpandableListView parent, View v,
			int groupPosition, int childPosition, long id) {
		// TODO Auto-generated method stub
		if (mListener != null) {
			mListener.onSelectItem(groupPosition, childPosition);
		}
		return false;
	}

在MainActivity.java类中设置监听器，和设置Handler与Service通信

/**
	 * 选择对应的Item
	 */
	@Override
	public void onSelectItem(int groupPosition, int childPosition) {
		// TODO Auto-generated method stub
		RadioChannelData channelData = NetRadioApp.finalChanneldata.get(
				groupPosition).get(childPosition);
		mName.setText(channelData.getChannelName());
		for (int i = 0; i < mUpdateHandler.size(); i++) {
			Handler h = mUpdateHandler.get(i);
			Message msg = h.obtainMessage();
			msg.what = GlobalConstants.SELECT_ITEM;
			Bundle data = new Bundle();
			data.putInt("groupPosition", groupPosition);
			data.putInt("childPosition", childPosition);
			msg.setData(data);
			h.sendMessage(msg);
		}
	}

	public static void addUpdateHandler(Handler handler) {
		mUpdateHandler.add(handler);
	}

	public static void removeUpdateHandler(Handler handler) {
		mUpdateHandler.remove(handler);
	}

在Service中处理播放PlayService.java

package com.dzt.netradio.player;

import java.io.IOException;

import io.vov.vitamio.MediaPlayer;
import io.vov.vitamio.MediaPlayer.OnBufferingUpdateListener;
import io.vov.vitamio.MediaPlayer.OnCompletionListener;
import io.vov.vitamio.MediaPlayer.OnPreparedListener;
import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;

import com.dzt.netradio.MainActivity;
import com.dzt.netradio.NetRadioApp;
import com.dzt.netradio.WeakHandler;
import com.dzt.netradio.constant.GlobalConstants;
import com.dzt.netradio.domain.RadioChannelData;

public class PlayService extends Service implements OnBufferingUpdateListener,
		OnCompletionListener, OnPreparedListener {

	private MediaPlayer mPlayer;

	public void MyMethod() {
		GlobalConstants.print_i("PlayService", "MyMethod called");
	}

	public PlayService() {
	}

	@Override
	public IBinder onBind(Intent intent) {
		// TODO Auto-generated method stub
		return myBinder;
	}

	public class MyBinder extends Binder {

		public PlayService getService() {
			return PlayService.this;
		}
	}

	private MyBinder myBinder = new MyBinder();

	@Override
	public void onCreate() {
		// TODO Auto-generated method stub
		super.onCreate();
		MainActivity.addUpdateHandler(selectItemHandler);
		GlobalConstants.print_i("PlayService", "onCreate called");
	}

	@Override
	public void onDestroy() {
		// TODO Auto-generated method stub
		MainActivity.removeUpdateHandler(selectItemHandler);
		if (mPlayer != null) {
			mPlayer.release();
			mPlayer = null;
		}
		super.onDestroy();
	}

	@Override
	public void onPrepared(MediaPlayer mp) {
		// TODO Auto-generated method stub
		GlobalConstants.print_i("PlayService", "onPrepared called");
		if (mPlayer != null)
			mPlayer.start();// 开始播放
	}

	@Override
	public void onCompletion(MediaPlayer mp) {
		// TODO Auto-generated method stub
		GlobalConstants.print_i("PlayService", "onCompletion called");
	}

	@Override
	public void onBufferingUpdate(MediaPlayer mp, int percent) {
		// TODO Auto-generated method stub
		// GlobalConstants.print_i("PlayService", "onBufferingUpdate called");
	}

	private void playSelectItem(String url) {
		if (mPlayer == null) {
			try {
				mPlayer = new MediaPlayer(this);// 播放流媒体的对象
				mPlayer.setDataSource(url);// 设置流媒体的数据源
				mPlayer.prepare();
				mPlayer.setOnBufferingUpdateListener(this);
				mPlayer.setOnCompletionListener(this);
				mPlayer.setOnPreparedListener(this);
			} catch (Exception e) {
				GlobalConstants.print_i("PlayService", "onCreate Exception = "
						+ e.toString());
				e.printStackTrace();
			}
		} else {
			try {
				mPlayer.setDataSource(url);// 设置流媒体的数据源
			} catch (Exception e) {
				GlobalConstants.print_i("PlayService", "onCreate Exception = "
						+ e.toString());
				e.printStackTrace();
			}
		}

		GlobalConstants.print_i("PlayService", "playSelectItem url = " + url);
	}

	private Handler selectItemHandler = new SelectItemHandler(this);

	private static class SelectItemHandler extends WeakHandler {

		public SelectItemHandler(PlayService owner) {
			super(owner);
			// TODO Auto-generated constructor stub
		}

		@Override
		public void handleMessage(Message msg) {
			// TODO Auto-generated method stub
			PlayService owner = getOwner();
			if (owner == null)
				return;
			switch (msg.what) {
			case GlobalConstants.SELECT_ITEM:
				Bundle data = msg.getData();
				int groupPosition = data.getInt("groupPosition");
				int childPosition = data.getInt("childPosition");
				RadioChannelData channelData = NetRadioApp.finalChanneldata
						.get(groupPosition).get(childPosition);
				owner.playSelectItem(channelData.getChannelURL());
				break;
			default:
				break;
			}
		}
	}

}

但只能播放一次，再点击Item就不能播放或自动退出，还没找到是什么原因，在后续再解决这个问题Vitamio中的MediaPlayer与系统中的MediaPlayer非常相似，用起来也方便，比VLC要方便

相关代码：http://download.csdn.net/detail/deng0zhaotai/7905367

参考文档：

1、网络电台地址（一）

2、网络电台地址（二）

3、http://www.cnblogs.com/mythou/p/3231184.html