InterceptScrollView, solved scroll interception problem when RecyclerView inside NestedScrollView

InterceptScrollView

public class InterceptScrollView extends NestedScrollView {

  private int downX;
  private int downY;
  private int mTouchSlop;
  public InterceptScrollView(Context context) {
    super(context);
    mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
  }

  public InterceptScrollView(Context context, AttributeSet attrs) {
    super(context, attrs);
    mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
  }

  public InterceptScrollView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
  }

  @Override public void requestChildFocus(View child, View focused) {
    // super.requestChildFocus(child, focused);
  }

  @Override
  public boolean onInterceptTouchEvent(MotionEvent ev) {
    int action = ev.getAction();
    switch (action) {
      case MotionEvent.ACTION_DOWN:
        downX = (int) ev.getRawX();
        downY = (int) ev.getRawY();
        break;
      case MotionEvent.ACTION_MOVE:
        int moveY = (int) ev.getRawY();
        if (Math.abs(moveY - downY) > mTouchSlop) {
          return true;
        }
    }
    return super.onInterceptTouchEvent(ev);
  }
}