惯性滑动切换（Fling操作）

重写LinearLayoutManager类，配合v7包中的PagerSnapHelper 达成效果

FlingLayoutManager:

/*** Synopsis     ${SYNOPSIS}* Author		Mosr* Version		${VERSION}* Create 	    2018.08.28 15:52* Email  		intimatestranger@sina.cn*/
public class FlingLayoutManager extends LinearLayoutManager implements RecyclerView.OnChildAttachStateChangeListener {private OnViewPagerListener mOnViewPagerListener;private PagerSnapHelper mPagerSnapHelper;private int mDrift;//位移，判断移动方向public FlingLayoutManager setmOnViewPagerListener(OnViewPagerListener mOnViewPagerListener) {this.mOnViewPagerListener = mOnViewPagerListener;return this;}public FlingLayoutManager(Context context, int orientation, boolean reverseLayout) {super(context, orientation, reverseLayout);mPagerSnapHelper = new PagerSnapHelper();}@Overridepublic void onAttachedToWindow(RecyclerView view) {view.addOnChildAttachStateChangeListener(this);mPagerSnapHelper.attachToRecyclerView(view);super.onAttachedToWindow(view);}@Overridepublic void onDetachedFromWindow(RecyclerView view, RecyclerView.Recycler recycler) {super.onDetachedFromWindow(view, recycler);}/*** @param dy       下 负*                 上 正* @param recycler* @param state** @return*/@Overridepublic int scrollVerticallyBy(int dy, RecyclerView.Recycler recycler, RecyclerView.State state) {this.mDrift = dy;return super.scrollVerticallyBy(dy, recycler, state);}@Overridepublic boolean canScrollVertically() {
//        return super.canScrollVertically();return true;}@Overridepublic void onChildViewAttachedToWindow(View view) {if (this.mOnViewPagerListener != null) {mOnViewPagerListener.onPageSelected(getPosition(view), mDrift > 0);}}@Overridepublic void onChildViewDetachedFromWindow(View view) {if (this.mOnViewPagerListener != null) {mOnViewPagerListener.onPageRelease(getPosition(view), mDrift > 0);}}@Overridepublic void onScrollStateChanged(int state) {switch (state) {case RecyclerView.SCROLL_STATE_IDLE:if (this.mOnViewPagerListener != null) {View mView = mPagerSnapHelper != null ? mPagerSnapHelper.findSnapView(this) : null;if (mView != null) {mOnViewPagerListener.onPageSelected(getPosition(mView), true);}}break;}super.onScrollStateChanged(state);}
}

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