解决NestedScrollView嵌套RecycleView的bug

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正常情况下NestedScrollView嵌套RecycleView，一是会出现只显示一行的情况，二是滑动异常即事件冲突。

解决方法：

1.也是最简单的方法，把design库和V7库升级到23.2以上，注意加上以下代码

mLinearLayoutManager.setSmoothScrollbarEnabled(true);  mLinearLayoutManager.setAutoMeasureEnabled(true);  cardslist_view.setLayoutManager(mLinearLayoutManager);  cardslist_view.setHasFixedSize(true);  cardslist_view.setNestedScrollingEnabled(false);

问题即可解决。

2.麻烦一点，重写LinearLayoutManager和NestedScrollView。

public class CustomLinearLayoutManager extends LinearLayoutManager {        public CustomLinearLayoutManager(Context context, int orientation, boolean reverseLayout) {          super(context, orientation, reverseLayout);      }        private int[] mMeasuredDimension = new int[2];        @Override      public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State state,                            int widthSpec, int heightSpec) {          final int widthMode = View.MeasureSpec.getMode(widthSpec);          final int heightMode = View.MeasureSpec.getMode(heightSpec);          final int widthSize = View.MeasureSpec.getSize(widthSpec);          final int heightSize = View.MeasureSpec.getSize(heightSpec);          int width = 0;          int height = 0;          for (int i = 0; i < getItemCount(); i++) {              if (getOrientation() == HORIZONTAL) {                  measureScrapChild(recycler, i,                          View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),                          heightSpec,                          mMeasuredDimension);                    width = width + mMeasuredDimension[0];                  if (i == 0) {                      height = mMeasuredDimension[1];                  }              } else {                  measureScrapChild(recycler, i,                          widthSpec,                          View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),                          mMeasuredDimension);                  height = height + mMeasuredDimension[1];                  if (i == 0) {                      width = mMeasuredDimension[0];                  }              }          }          switch (widthMode) {              case View.MeasureSpec.EXACTLY:                  width = widthSize;              case View.MeasureSpec.AT_MOST:              case View.MeasureSpec.UNSPECIFIED:          }            switch (heightMode) {              case View.MeasureSpec.EXACTLY:                  height = heightSize;              case View.MeasureSpec.AT_MOST:              case View.MeasureSpec.UNSPECIFIED:          }            setMeasuredDimension(width, height);      }        private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec,                                     int heightSpec, int[] measuredDimension) {          View view = recycler.getViewForPosition(position);          recycler.bindViewToPosition(view, position);          if (view != null) {              RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams();              int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec,                      getPaddingLeft() + getPaddingRight(), p.width);              int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec,                      getPaddingTop() + getPaddingBottom(), p.height);              view.measure(childWidthSpec, childHeightSpec);              measuredDimension[0] = view.getMeasuredWidth() + p.leftMargin + p.rightMargin;              measuredDimension[1] = view.getMeasuredHeight() + p.bottomMargin + p.topMargin;              recycler.recycleView(view);          }      }    }

    public class MyNestedScrollView extends NestedScrollView {          private int downX;          private int downY;          private int mTouchSlop;                public MyNestedScrollView(Context context) {              super(context);              mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();          }                public MyNestedScrollView(Context context, AttributeSet attrs) {              super(context, attrs);              mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();          }                public MyNestedScrollView(Context context, AttributeSet attrs, int defStyleAttr) {              super(context, attrs, defStyleAttr);              mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();          }                @Override          public boolean onInterceptTouchEvent(MotionEvent e) {              int action = e.getAction();              switch (action) {                  case MotionEvent.ACTION_DOWN:                      downX = (int) e.getRawX();                      downY = (int) e.getRawY();                      break;                  case MotionEvent.ACTION_MOVE:                      int moveY = (int) e.getRawY();                      if (Math.abs(moveY - downY) > mTouchSlop) {                          return true;                      }              }              return super.onInterceptTouchEvent(e);          }      }

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