监听回调事件模式

和通过数据进行交互类似，监听回调模式除去了数据作为中间层，而直接在客户端中向框架传入监听，框架处理完事件后，通过回调通知客户端。

监听集合

通过一个SparseArray来存储监听

    private SparseArray<OnNavigationStateChangeListener> mOnNavigationStateChangeListenerGroup = new SparseArray<OnNavigationStateChangeListener>();

客户端传入监听

doTask会触发具体的业务，然后通过回调回传给客户端

    public void startNavigation(float endX, float endY, float endAngle, OnNavigationStateChangeListener mOnNavigationStateChangeListener) {
       
        registerOnNavigationStateChangeListener(mOnNavigationStateChangeListener, true);
        doTask（）；
    }

存储注册的监听

    public void registerOnNavigationStateChangeListener(OnNavigationStateChangeListener mOnNavigationStateChangeListener, boolean isNeedClean) {
        if (mOnNavigationStateChangeListener != null) {
                mOnNavigationStateChangeListenerGroup.append(mOnNavigationStateChangeListenerGroup.size(), mOnNavigationStateChangeListener);     
        }
    }

回传客户端

//在特定的位置 调用集合中的监听 将结果回传客户端
      for (int i = 0; i < navigationStateChangeListenerSize; i++) {
                    OnNavigationStateChangeListener mOnNavigationStateChangeListener = mOnNavigationStateChangeListenerGroup.valueAt(i);
                    if (mOnNavigationStateChangeListener != null)
                        mOnNavigationStateChangeListener.onNavigationStart();
  }

取消注册的监听

    /**
     * 取消注册导航下位机命令
     */
    public void unRegisterOnNavigationStateChangeListener(OnNavigationStateChangeListener mOnNavigationStateChangeListener) {
        int size = mOnNavigationStateChangeListenerGroup.size();
        for (int i = 0; i < size; i++) {
            OnNavigationStateChangeListener onNavigationStateChangeListener = mOnNavigationStateChangeListenerGroup.valueAt(i);
            if (onNavigationStateChangeListener.equals(mOnNavigationStateChangeListener)) {
                mOnNavigationStateChangeListenerGroup.removeAt(i);
                break;
            }
        }
    }