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

    //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 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();
            //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;
            }}}

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