适用于svr SDK APP开发的controller插件
    controller插件框架，unity使用的是controller插件，controller.cs脚本应用可以根据自己情况进行调整实现。controller plugin这一部分使用java代码实现，以aar库的形式存在于controller插件中。AIDLControllerService和ControllerService是以common service方式存在，代码打包在GvrLctService.apk中，此代码会编译到系统system.img中。controller.cs 和controller plugin在app进程中运行，AIDLcontrollerService和ControllerService运行在com.google.vr.vrcore进程中。
    controller支持大多数daydream app的手柄行为 。 实现上主要采用与daydream手柄service同名的controllerservice实现。Daydream app可以bind到针对手柄实现的ConrollerServices. 使用daydream sdk约定的listener(IControllerListener)进行通信。如图：

图片1.png

    在设计AirMouse的操作实现的时候，通过对google controller service进行一层封装。应用通过调用AIDL controller service来对controller service进行操作。由于google/vr/vrcore/controller实现的方式是通过打包到system/priv-app/GvrLctService中，因此这里需要进行CS通信，这里使用的是LocalBroadcastManager的方式，进行通信。
    发送方：

import android.support.v4.content.LocalBroadcastManager;

LocalBroadcastManager localBroadcastManager;

public void onCreate(){
        super.onCreate();
        localBroadcastManager = LocalBroadcastManager.getInstance(this);
......

        @Override
        public void updateAirMouseControllerState(boolean enable){
           Log.d(TAG,"UpdateAirMouseControllerState"+" enable = "+enable);
           mAirMouseControllerState = enable;
           Intent intent = new Intent();
           intent.putExtra("enable", enable);
           intent.setAction("FREEZE_HAND_DEVICES");
           localBroadcastManager.sendBroadcast(intent);
        }

    接收方：

import android.support.v4.content.LocalBroadcastManager;

private LocalBroadcastManager localBroadcastManager;

    @Override
    public void onCreate() {
        super.onCreate();
        localBroadcastManager = LocalBroadcastManager.getInstance(this);
        IntentFilter filter = new IntentFilter();
        filter.addAction("FREEZE_HAND_DEVICES");
        localBroadcastManager.registerReceiver(eventReceiver,filter);
    }

    public class EventReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if("OPEN_VIBRATOR_ACTION".equals(action)) {
                controlJoystickVibrate(3, 5);
            }else if("OPEN_VIBRATOR_TIME_ACTION".equals(action)) {
                long time = intent.getLongExtra("time", -1);
                controlJoystickVibrate(3, (int)time);
......
            }else if("FREEZE_HAND_DEVICES".equals(action)){
                boolean status = intent.getBooleanExtra("enable", false);
                mFreezeAirMouseDayDream = status;
            }
        }
    }
......

这里的成员变量是手柄在2d和3d场景下切换的控制flag

    // add: Freeze DayDream hand devices activity when enable 2D dialog
    boolean mFreezeAirMouseDayDream = false;