Service后台服务控制音乐的播放暂停和停止,播放完自动播放下一曲

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//添加获得sd卡的状态权限,和读取sd卡的权限

<uses-
permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
<uses-
permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
//
MainActivity中用三个按钮,播放,暂停,停止,发送服务到后台服务来控制

public class MainActivity extends Activity implements OnClickListener {
private Button puase;

private Button stop;

private Button start;


@Override

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

start = (Button) findViewById(R.id.start);

puase = (Button) findViewById(R.id.puase);

stop = (Button) findViewById(R.id.stop);


start.setOnClickListener(this);

puase.setOnClickListener(this);

stop.setOnClickListener(this);

}
@Override

public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, Service1.class);

switch (v.getId()) {
case R.id.start:
intent.putExtra("key", 1);

break;

case R.id.puase:
intent.putExtra("key", 2);

break;

case R.id.stop:
intent.putExtra("key", 3);

break;

default:
break;

}
startService(intent);

}
}
//自定义类,继承Service服务

public class Service1 extends Service {
private MediaPlayer mediaplayer;

private ArrayList<Music> list;

private String path = "";

private int index = 0;


@Override

public IBinder onBind(Intent intent) {
return null;

}
@Override

public void onCreate() {
super.onCreate();

mediaplayer = new MediaPlayer();

list = new ArrayList<Music>();

//读取SD卡

if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
File file = Environment.getExternalStorageDirectory();

path = file.getAbsolutePath();

}
list.add(new Music("男人歌", path + "/nanrenge.mp3"));

list.add(new Music("夜色", path + "/yese.mp3"));

list.add(new Music("漂洋过海来看你", path + "/piaoyang.mp3"));

list.add(new Music("兄弟无数", path + "/xiongdiwushu.mp3"));

//播放完成后自定播放下一曲

mediaplayer.setOnCompletionListener(new OnCompletionListener() {
@Override

public void onCompletion(MediaPlayer mp) {
index++;

play();

}
});

}
	//用这个方法控制MainActivity发来的服务,控制音乐
@Override

public int onStartCommand(Intent intent, int flags, int startId) {
int m = intent.getIntExtra("key", 0);

switch (m) {
case 1:
play();

break;

case 2:// 暂停

if (mediaplayer != null && mediaplayer.isPlaying())
mediaplayer.pause();

break;

case 3:// 停止

if (mediaplayer != null) {
mediaplayer.stop();

stopService(intent);

}
break;


default:
break;

}
return super.onStartCommand(intent, flags, startId);

}
	//播放音乐
private void play() {
mediaplayer.reset();

try {
mediaplayer.setDataSource(list.get(index).getPath());

mediaplayer.prepare();

} catch (Exception e) {
e.printStackTrace();

}
mediaplayer.start();

}
@Override

public void onDestroy() {
super.onDestroy();

if (mediaplayer != null) {
mediaplayer.release();

mediaplayer = null;

}
}
}