Android 绑定服务，定时往服务器发送指令

有一个需求，因为后台没做接口，为了测试，实现基本展示功能，将让设备运动的指令动作，因此，打算将指令做成一个数组，绑定服务，由服务在后台定时发送指令。

服务类：用timer和timertask做定时处理；另外一个方法设置需要发送的指令集，由MainActivity绑定传递。

public class MusicDanceService extends Service {
    private MyBinder binder = null;
    private final static String TAG = "TestService";
    public MusicDanceService() {
    }

    @Override
    public void onCreate() {
        super.onCreate();
        binder = new MyBinder();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        binder = null;
    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.

        return binder;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

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

    public class MyBinder extends Binder {
        private int[] actions;
        public TimerTask mTimerTask = null;
        public Timer mTimer = null;
        private int position;
        /**
         * 根据动作数组发送指定指令
         */
        public void startMusicDanceActions(final int[] actions ){
            if (!(actions.length > 0)) return;
            this.actions = actions;
            if (mTimerTask != null){
                mTimerTask.cancel();
                mTimerTask = null;
            }
            if (mTimer != null){
                mTimer.cancel();
                mTimer = null;
            }
            position = 0;
            mTimerTask = new TimerTask() {
                @Override
                public void run() {
                    handleSendCmd(actions[position]);
                }

            };
            mTimer = new Timer();
            mTimer.schedule(mTimerTask,0,1500);
        }

        private void handleSendCmd(int type){
            switch (type){
                case 1:
                    Log.d(TAG, "startMusicDanceActions: 前进");
                    break;
                case 2:
                    Log.d(TAG, "startMusicDanceActions: 后退");
                    break;
                case 3:
                    Log.d(TAG, "startMusicDanceActions: 左转");
                    break;
                case 4:
                    Log.d(TAG, "startMusicDanceActions: 右转");
                    break;
                default:
                    break;
            }
            position ++;
            if (position >= actions.length) {
                position = 0;
            }
            Log.d(TAG, "handleSendCmd: " + position);
        }
    }

}

MainActivity类：

private MusicDanceService.MyBinder mMyBinder = null;
int[] actions = new int[]{1,4,3,2,3,2,1,2,3,4,3,2};

初始化一个指令集，由于动作只由四种，将1~4分别代表不同的指令，

在connection中得到服务的binder

private ServiceConnection mConnection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
            Log.d("Test", "onServiceConnected: ");
            mMyBinder = (MusicDanceService.MyBinder) iBinder;
        }

        @Override
        public void onServiceDisconnected(ComponentName componentName) {
            Log.d("Test", "onServiceDisconnected: ");
        }
    };

主要是绑定服务，然后需要调用的时候调用方法，最后，在destroy的时候需要解绑服务。

//连接服务
        Intent intent = new Intent(this,MusicDanceService.class);
        bindService(intent,mConnection,BIND_AUTO_CREATE);
        findViewById(R.id.send_btn).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (mMyBinder != null){
                    mMyBinder.startMusicDanceActions(actions);
                }
            }
        });

最后

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