Android 虚拟摇杆，多种模式回调，返回距离级别，方向，角度。

使用方法 ①attr 中定义自定义参数

②复制 RockerView 到项目中 ③使用摇杆控件

③事件回调

mRockerView.setOnShakeListener(DIRECTION_8, new RockerView.OnShakeListener() {
        @Override
        public void onStart() {

        }

        @Override
        public void direction(RockerView.Direction direction) {
            if (direction == RockerView.Direction.DIRECTION_CENTER){
                mTvShake.setText("当前方向：中心");
            }else if (direction == RockerView.Direction.DIRECTION_DOWN){
                mTvShake.setText("当前方向：下");
            }else if (direction == RockerView.Direction.DIRECTION_LEFT){
                mTvShake.setText("当前方向：左");
            }else if (direction == RockerView.Direction.DIRECTION_UP){
                mTvShake.setText("当前方向：上");
            }else if (direction == RockerView.Direction.DIRECTION_RIGHT){
                mTvShake.setText("当前方向：右");
            }else if (direction == RockerView.Direction.DIRECTION_DOWN_LEFT){
                mTvShake.setText("当前方向：左下");
            }else if (direction == RockerView.Direction.DIRECTION_DOWN_RIGHT){
                mTvShake.setText("当前方向：右下");
            }else if (direction == RockerView.Direction.DIRECTION_UP_LEFT){
                mTvShake.setText("当前方向：左上");
            }else if (direction == RockerView.Direction.DIRECTION_UP_RIGHT){
                mTvShake.setText("当前方向：右上");
            }
        }

        @Override
        public void onFinish() {

        }
    });
    mRockerView.setOnAngleChangeListener(new RockerView.OnAngleChangeListener() {
        @Override
        public void onStart() {

        }

        @Override
        public void angle(double angle) {
            mTvAngle.setText("当前角度："+angle);
        }

        @Override
        public void onFinish() {

        }
    });

    mRockerView.setOnDistanceLevelListener(new RockerView.OnDistanceLevelListener() {
        @Override
        public void onDistanceLevel(int level) {
            mTvLevel.setText("当前距离级别："+level);
        }
    });