2019-11-13ViewPager+NestedScroll

核心代码就是重写NestScrollView的onIntereptTouchEvent方法，判断手势滑动方法
public class JudgeNestedScrollView extends NestedScrollView {
private boolean isNeedScroll = true;
private float xDistance, yDistance, xLast, yLast;

public JudgeNestedScrollView(@NonNull Context context) {
    super(context);
}

public JudgeNestedScrollView(@NonNull Context context, @Nullable AttributeSet attrs) {
    super(context, attrs);
}

public JudgeNestedScrollView(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
}

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
    switch (ev.getAction()) {
        case MotionEvent.ACTION_DOWN:
            xDistance = yDistance = 0f;
            xLast = ev.getX();
            yLast = ev.getY();
            break;
        case MotionEvent.ACTION_MOVE:
            final float curX = ev.getX();
            final float curY = ev.getY();
            xDistance += Math.abs(curX - xLast);
            yDistance += Math.abs(curY - yLast);
            xLast = curX;
            yLast = curY;
            if (xDistance > yDistance) {
                return false;
            }
            return isNeedScroll;

    }
    return super.onInterceptTouchEvent(ev);
}

/*
改方法用来处理NestedScrollView是否拦截滑动事件
 */
public void setNeedScroll(boolean isNeedScroll) {
    this.isNeedScroll = isNeedScroll;
}

}