播放背景音乐，Service的简单应用

首先创建自己的Service处理类
MyService

public class MyService extends Service {
	private MediaPlayer mp;

	@Override
	public void onStart(Intent intent, int startId) {
		// TODO Auto-generated method stub
		//开始播放音乐
		mp.start();
		//音乐播放完毕的事件处理
		mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener()         {
			
			public void onCompletion(MediaPlayer mp) {
				// TODO Auto-generated method stub
                                //循环播放
				try {
					mp.start();
				} catch (IllegalStateException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		});
		//播放音乐时发生错误的事件处理
		mp.setOnErrorListener(new MediaPlayer.OnErrorListener() {
			
			public boolean onError(MediaPlayer mp, int what, int extra) {
				// TODO Auto-generated method stub
				//释放资源
				try {
					mp.release();
				} catch (Exception e) {
					e.printStackTrace();
				}
				
				return false;
			}
		});
		
		super.onStart(intent, startId);
	}

	@Override
	public void onCreate() {
		// TODO Auto-generated method stub
                //初始化音乐资源
		try {
                        //创建MediaPlayer对象
			mp = new MediaPlayer();
                        //将音乐以Import的方式保存在res/raw/zhou.mp3
			mp = MediaPlayer.create(MyService.this, R.raw.zhou);
                        //在MediaPlayer取得播放资源与stop()之后要准备PlayBack的状            态前一定要使用MediaPlayer.prepeare()
			mp.prepare();
		} catch (IllegalStateException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		super.onCreate();
	}

	@Override
	public void onDestroy() {
		// TODO Auto-generated method stub
		//服务停止时停止播放音乐并释放资源
		mp.stop();
		mp.release();
		
		super.onDestroy();
	}

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

}

然后在需要播放背景音乐的Activity的onCreate()方法中加入如下代码

Intent intent = new Intent(MyAcitivity.this,Myservice.class);
startService(intent);

在其onStop()方法中加入如下代码

Intent intent = new Intent(MyActivity.this,MyService.class);
stopService(intent);

最后在AndroidManifest.xml中做如下配置

<service
			android:name=".MyService"
			android:exported="true"
			android:process=":remote">
</service>