@Override public boolean onTouchEvent(MotionEvent ev) {
    switch (ev.getAction()) {
      case MotionEvent.ACTION_DOWN:
        return true;
      case MotionEvent.ACTION_MOVE:
		 if(上下移动到阀值){
		 	展开为详情()
		 }else if(上下滑动到阀值，恢复viewpager){
		 }else if(下滑，则关闭Activity)

	  bottom.offsetLeftAndRight(
            (int) (target.getWidth() / 2 - target.getWidth() * (1 + progress) / 2
                + MarginConfig.MARGIN_LEFT_RIGHT - bottom.getX()));

    setPageTransformer(true, new ZoomOutPageTransformer());

/改变系统绘制顺序
  @Override protected int getChildDrawingOrder(int childCount, int i) {

    int position = getCurrentItem();
    if(position<0){
      return i;
    }else{
      if(i == childCount - 1){//这是最后一个需要刷新的item
        if(position>i){
          position=i;
        }
        return position;
      }
      if(i == position){//这是原本要在最后一个刷新的item
        return childCount - 1;
      }
    }
    return i;
  }
}

@Override
  public boolean onNestedFling(CoordinatorLayout coordinatorLayout, View child, View target,
      float velocityX, float velocityY, boolean consumed) {

    //向下Fling并且到顶部
    if (velocityY < 0 && ((RecyclerView) target).getChildAt(0).getY() == 0) {
      mDependency.restore(mDependency.getY());
    }
    return super.onNestedFling(coordinatorLayout, child, target, velocityX, velocityY, consumed);
  }

  @Override
  public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, View child, View target,
      int dx, int dy, int[] consumed) {

    //如果在顶部
    if (((RecyclerView) target).getChildAt(0).getY() == 0) {
      //向下滑动
      if (dy < 0) {
        mDependency.setY(mDependency.getY() - dy);
        //小于阀值
        if (mDependency.getY() < 500) {
          mDependency.restore(mDependency.getY());
        }
      }
    }
    super.onNestedPreScroll(coordinatorLayout, child, target, dx, dy, consumed);
  }
}

Copyright 2016 androidwing1992

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.