NestedScrollView 嵌套ViewPageer,ViewPager中嵌套多个带RecyclerView的自定义view滑动时的问题解决

遇到的问题描述：

嵌套后ViewPager中的view展示不出来，解决办法：重新设置Viewpager的高度

自定义viewpager

public class WrapViewPager extends ViewPager {      private int current;     private int height = 0;     /**      * 保存position与对于的View      */     private HashMap<Integer, View> childrenViews = new LinkedHashMap();      private boolean isCanScroll = false;      public WrapViewPager(Context context) {         super(context, null);     }      public WrapViewPager(Context context, AttributeSet attrs) {         super(context, attrs);     }      public void setScanScroll(boolean isCanScroll) {         this.isCanScroll = isCanScroll;     }//切换tab的时候重新设置viewpager的高度     public void resetHeight(int current) {         this.current = current;         if (childrenViews.size() > current) {             LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) getLayoutParams();             if (layoutParams == null) {                 layoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, height);             } else {                 layoutParams.height = height;             }             setLayoutParams(layoutParams);         }     }      /**      * 保存position与对于的View      */     public void setObjectForPosition(View view, int position) {         childrenViews.put(position, view);     }      @Override     public void scrollTo(int x, int y) {         super.scrollTo(x, y);     }      @Override     public boolean onTouchEvent(MotionEvent arg0) {         try {             if (isCanScroll) {                 return super.onTouchEvent(arg0);             }         } catch (Exception e) {         }          return false;      }      @Override     public boolean onInterceptTouchEvent(MotionEvent arg0) {         try {             if (isCanScroll) {                 return super.onInterceptTouchEvent(arg0);             }         } catch (Exception e) {          }          return false;     }      @Override     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {         super.onMeasure(widthMeasureSpec, heightMeasureSpec);         if (childrenViews.size() > current) {             View child = childrenViews.get(current);             child.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));             height = child.getMeasuredHeight();         }         heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);          super.onMeasure(widthMeasureSpec, heightMeasureSpec);     } } 

　　调用的方法：创建三个自定义view，添加到view列表中

        view1 = UserView(context)         viewpager.setObjectForPosition(goodView,0)         view2  = UserView(context)         viewpager.setObjectForPosition(middleView,1)         view3 = UserView(context)         viewpager.setObjectForPosition(badView,2)

       pageList.add(view1)       pageList.add(view2)       pageList.add(view3)

监听viewpager

 viewpager.addOnPageChangeListener(object : ViewPager.OnPageChangeListener {             override fun onPageScrollStateChanged(p0: Int) {             }              override fun onPageScrolled(p0: Int, p1: Float, p2: Int) {             }              override fun onPageSelected(index: Int) {                 viewpager.resetHeight(index)                 //自己的代码实现             }         })

设置好后高度问题解决了，因自定义view为了防止tab切换时每次重新加载页面和数据，做了return处理，这里viewpager高度变化后，

    scrollView.setOnScrollChangeListener(NestedScrollView.OnScrollChangeListener { v, scrollX, scrollY, oldScrollX, oldScrollY ->             if (scrollY == v.getChildAt(0).measuredHeight - v.measuredHeight) {                 //到底了                 if (isLoadMore) {                                      } else {                                     }             }         })

if (isLoading) {    return}