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

1public class WrapViewPager extends ViewPager {
2
3    private int current;
4    private int height = 0;
5    /**
6     * 保存position与对于的View
7     */
8    private HashMap<Integer, View> childrenViews = new LinkedHashMap();
9
10    private boolean isCanScroll = false;
11
12    public WrapViewPager(Context context) {
13        super(context, null);
14    }
15
16    public WrapViewPager(Context context, AttributeSet attrs) {
17        super(context, attrs);
18    }
19
20    public void setScanScroll(boolean isCanScroll) {
21        this.isCanScroll = isCanScroll;
22    }//切换tab的时候重新设置viewpager的高度
23    public void resetHeight(int current) {
24        this.current = current;
25        if (childrenViews.size() > current) {
26            LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) getLayoutParams();
27            if (layoutParams == null) {
28                layoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, height);
29            } else {
30                layoutParams.height = height;
31            }
32            setLayoutParams(layoutParams);
33        }
34    }
35
36    /**
37     * 保存position与对于的View
38     */
39    public void setObjectForPosition(View view, int position) {
40        childrenViews.put(position, view);
41    }
42
43    @Override
44    public void scrollTo(int x, int y) {
45        super.scrollTo(x, y);
46    }
47
48    @Override
49    public boolean onTouchEvent(MotionEvent arg0) {
50        try {
51            if (isCanScroll) {
52                return super.onTouchEvent(arg0);
53            }
54        } catch (Exception e) {
55        }
56
57        return false;
58
59    }
60
61    @Override
62    public boolean onInterceptTouchEvent(MotionEvent arg0) {
63        try {
64            if (isCanScroll) {
65                return super.onInterceptTouchEvent(arg0);
66            }
67        } catch (Exception e) {
68
69        }
70
71        return false;
72    }
73
74    @Override
75    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
76        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
77        if (childrenViews.size() > current) {
78            View child = childrenViews.get(current);
79            child.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
80            height = child.getMeasuredHeight();
81        }
82        heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);
83
84        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
85    }
86}

　　调用的方法：创建三个自定义view，添加到view列表中

1view1 = UserView(context)
2        viewpager.setObjectForPosition(goodView,0)
3        view2  = UserView(context)
4        viewpager.setObjectForPosition(middleView,1)
5        view3 = UserView(context)
6        viewpager.setObjectForPosition(badView,2)
7
8pageList.add(view1)       pageList.add(view2)       pageList.add(view3)

监听viewpager

1 viewpager.addOnPageChangeListener(object : ViewPager.OnPageChangeListener {
2            override fun onPageScrollStateChanged(p0: Int) {
3            }
4
5            override fun onPageScrolled(p0: Int, p1: Float, p2: Int) {
6            }
7
8            override fun onPageSelected(index: Int) {
9                viewpager.resetHeight(index)
10                //自己的代码实现
11            }
12        })

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，

NestedScrollView 的高度也许变化，监听是否到底部的事件得重新监听，放到return之前即可

1scrollView.setOnScrollChangeListener(NestedScrollView.OnScrollChangeListener { v, scrollX, scrollY, oldScrollX, oldScrollY ->
2            if (scrollY == v.getChildAt(0).measuredHeight - v.measuredHeight) {
3                //到底了
4                if (isLoadMore) {
5                    
6                } else {
7                   
8                }
9            }
10        })
11
12if (isLoading) {    return}