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首先看實(shí)現(xiàn)效果圖：

類似的這種需求在實(shí)際的項目中還是挺多的。說說的詳情頁，頂部顯示內(nèi)容，然后顯示一個熱門評論，最后顯示全部評論。兩個評論列表數(shù)量都是動態(tài)的，并且全部評論還可以下拉刷新。?

我們來實(shí)現(xiàn)這個效果。

1、布局

最關(guān)鍵的是 NestedScrollView 控件，看這張圖

NestedScrollView  // 滾動頁 - LinearLayout  // NestedScrollView 只能包含一個 LinearLayout   - LinearLayout // 說說詳情   - LinearLayout // 熱門評論     - RecyclerView   - LinearLayout // 全部評論     - RecyclerView

2、重寫 LinearLayoutManager

初始化 RecyclerView 時需要設(shè)置 setLayoutManager(),我們需要重寫它來計算列表的高度。

代碼如下：

public?class?WrappingLinearLayoutManager?extends?LinearLayoutManager{
    public WrappingLinearLayoutManager(Context context) {        super(context);    }
    private int[] mMeasuredDimension = new int[2];
    @Override    public boolean canScrollVertically() {        return false;    }
    @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(0, View.MeasureSpec.UNSPECIFIED),                        heightSpec,                        mMeasuredDimension);
                width = width + mMeasuredDimension[0];                if (i == 0) {                    height = mMeasuredDimension[1];                }            } else {                measureScrapChild(recycler, i,                        widthSpec,                        View.MeasureSpec.makeMeasureSpec(0, 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);        if (view.getVisibility() == View.GONE) {            measuredDimension[0] = 0;            measuredDimension[1] = 0;            return;        }        // For adding Item Decor Insets to view        super.measureChildWithMargins(view, 0, 0);        RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams();        int childWidthSpec = ViewGroup.getChildMeasureSpec(                widthSpec,                getPaddingLeft() + getPaddingRight() + getDecoratedLeft(view) + getDecoratedRight(view),                p.width);        int childHeightSpec = ViewGroup.getChildMeasureSpec(                heightSpec,                getPaddingTop() + getPaddingBottom() + getDecoratedTop(view) + getDecoratedBottom(view),                p.height);        view.measure(childWidthSpec, childHeightSpec);
        // Get decorated measurements        measuredDimension[0] = getDecoratedMeasuredWidth(view) + p.leftMargin + p.rightMargin;        measuredDimension[1] = getDecoratedMeasuredHeight(view) + p.bottomMargin + p.topMargin;        recycler.recycleView(view);    }}

3、初始化 RecyclerView

就是按照正常的流程初始化 RecyclerView，只不過在 setLayoutManager() 時，

使用我們自定的 WrappingLinearLayoutManager。

至于其中的 DetailCommentAdapter 就是正常的 RecyclerView.Adapter。

RecyclerView RecyclerHot;RecyclerView RecyclerAll;
private DetailCommentAdapter mHotCommentAdapter;private DetailCommentAdapter mAllCommentAdapter;
private List mHotCommentsList = new ArrayList<>();private List mAllCommentsList = new ArrayList<>();
private void setView() {    // 設(shè)置熱門評論列表    WrappingLinearLayoutManager wrappingLinearLayoutManager = new WrappingLinearLayoutManager(mContext);    wrappingLinearLayoutManager.setAutoMeasureEnabled(false);// 如果導(dǎo)入的包是  Android Support Library 23.2.0  以上的，需要加這句    RecyclerHot.setLayoutManager(wrappingLinearLayoutManager);
    mHotCommentAdapter = new DetailCommentAdapter(mContext, mHotCommentsList, DetailCommentAdapter.COMMENT_TYPE_HOT);    RecyclerHot.setAdapter(mHotCommentAdapter);    RecyclerHot.setNestedScrollingEnabled(false);

    // 設(shè)置全部評論列表    WrappingLinearLayoutManager wrappingLinearLayoutManager2 = new WrappingLinearLayoutManager(mContext);    wrappingLinearLayoutManager2.setAutoMeasureEnabled(false);// 如果導(dǎo)入的包是  Android Support Library 23.2.0  以上的，需要加這句    RecyclerAll.setLayoutManager(wrappingLinearLayoutManager2);
    mAllCommentAdapter = new DetailCommentAdapter(mContext, mAllCommentsList, DetailCommentAdapter.COMMENT_TYPE_ALL);    RecyclerAll.setAdapter(mAllCommentAdapter);    RecyclerAll.setNestedScrollingEnabled(true);}

注意：

wrappingLinearLayoutManager.setAutoMeasureEnabled(false);
如果導(dǎo)入的包是 ?Android Support Library 23.2.0 ?以上的，需要加這句。
RecyclerHot.setNestedScrollingEnabled(false);
在這里setNestedScrollingEnabled（false）禁用滾動為RecyclerView，它不會攔截從NestedScrollView滾動事件。
setHasFixedSize（false）（默認(rèn)false）
確定適配器內(nèi)容中的更改可以更改RecyclerView的大小。

至此就可以實(shí)現(xiàn)想要達(dá)到的效果。

源碼地址：

https://github.com/Wing-Li/DoubleList

到這里就結(jié)束啦。

Android仿內(nèi)涵段子詳情頁評論功能

1、布局

2、重寫 LinearLayoutManager

3、初始化 RecyclerView

1、布局

2、重寫 LinearLayoutManager

3、初始化 RecyclerView