Android Service的两种使用方法

final Intent intent = new Intent(MainActivity.this,StartService.class);
        start.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                startService(intent);
            }
        });
        stop.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                stopService(intent);
            }
        });

    @Override
    public void onCreate() {
        super.onCreate();
        Log.e(TAG,"onCreate");
        mediaPlayer  =  MediaPlayer.create(this,R.raw.music);
    }
 
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.e(TAG,"onStartCommand");
        if(mediaPlayer.isPlaying()){
            mediaPlayer.pause();
        }
        else {
            mediaPlayer.start();
        }
        return super.onStartCommand(intent, flags, startId);
 
    }
    
    @Override
    public void onDestroy() {
        Log.e(TAG,"onDestroy");
        mediaPlayer.release();
        super.onDestroy();
    }

 ServiceConnection serviceConnection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
            Log.e(getClass().getName(),"onServiceConnected");
            myBinder = (BindService.MyBinder) iBinder;
            myBinder.startMusic();
        }
 
        @Override
        public void onServiceDisconnected(ComponentName componentName) {
            Log.e(getClass().getName(),"onServiceDisconnected");
        }
    };

 final Intent intent1 = new Intent(MainActivity.this,BindService.class);
        bind.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                bindService(intent1,serviceConnection,BIND_AUTO_CREATE);
            }
        });
        unbind.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                unbindService(serviceConnection);
            }
        });

    MyBinder myBinder = new MyBinder();
    MediaPlayer mediaPlayer;
    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
       // throw new UnsupportedOperationException("Not yet implemented");
        Log.e(TAG,"onBind");
        return myBinder;
    }
 
    @Override
    public void onCreate() {
        Log.e(TAG,"onCreate");
        mediaPlayer  =  MediaPlayer.create(this,R.raw.music);
        super.onCreate();
    }
 
    @Override
    public boolean onUnbind(Intent intent) {
        Log.e(TAG,"onUnbind");
        return super.onUnbind(intent);
    }
 
    @Override
    public void onDestroy() {
        Log.e(TAG,"onDestroy");
        mediaPlayer.release();
        super.onDestroy();
    }
 
 
    class MyBinder extends Binder{
        public void startMusic(){
            if(!mediaPlayer.isPlaying()){
                mediaPlayer.start();
            }
        }
 
        public void stopMusic(){
            if(mediaPlayer.isPlaying()){
                mediaPlayer.stop();
            }
        }
    }