android RecyclerView自适应高度的LayoutManager

RecyclerView原生的LayoutManager并不能自适应宽高，此处实现了一个LayoutManager的子类，实现了自适应。

如图下demo所示，具体可下载试玩我们的应用，免费赚钱

package com.nnddkj.meimeila.adapter;import android.content.Context;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.util.Log;import android.view.View;import android.view.ViewGroup;/** * 重写布局管理器实现自适应高度 * Created by nyw on 2017/6/4. */public class SyLinearLayoutManager extends LinearLayoutManager {    private static final int CHILD_WIDTH = 0;    private static final int CHILD_HEIGHT = 1;    private static final int DEFAULT_CHILD_SIZE = 100;    private final int[] childDimensions = new int[2];    private int childSize = DEFAULT_CHILD_SIZE;    private boolean hasChildSize;    @SuppressWarnings("UnusedDeclaration")    public SyLinearLayoutManager(Context context) {        super(context);    }    @SuppressWarnings("UnusedDeclaration")    public SyLinearLayoutManager(Context context, int orientation, boolean reverseLayout) {        super(context, orientation, reverseLayout);    }    private int[] mMeasuredDimension = new int[2];    @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;        Log.d("state:" ,state.toString());        for (int i = 0; i < getItemCount(); i++) {            try {                measureScrapChild(recycler, i,                        widthSpec,                        View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),                        mMeasuredDimension);            } catch (IndexOutOfBoundsException e) {                e.printStackTrace();            }            if (getOrientation() == HORIZONTAL) {                width = width + mMeasuredDimension[0];                if (i == 0) {                    height = mMeasuredDimension[1];                }            } else {                height = height + mMeasuredDimension[1];                if (i == 0) {                    width = mMeasuredDimension[0];                }            }        }//        Logger.d("ll width:"+width+";widthSize:"+widthSize+";widthSpec:"+widthSpec);//        Logger.d("ll height:"+width+";heightSize:"+heightSize+";heightSpec:"+heightSpec);//        Logger.d("ll widthMode:"+widthMode+";heightMode:"+heightMode);        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(widthSpec, height);    }    private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec, int heightSpec, int[] measuredDimension) {        View view = recycler.getViewForPosition(position);        // For adding Item Decor Insets to view//        super.measureChildWithMargins(view, 0, 0);        if (view != null) {            RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams();            int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec,                    getPaddingTop() + getPaddingBottom(), p.height);            view.measure(widthSpec, childHeightSpec);            measuredDimension[0] = view.getMeasuredWidth() + p.leftMargin + p.rightMargin;            measuredDimension[1] = view.getMeasuredHeight() + p.bottomMargin + p.topMargin;            recycler.recycleView(view);        }    }    @Override    public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) {//        Logger.e("SyLinearLayoutManager state:" + state.toString());        super.onLayoutChildren(recycler, state);    }}

在使用的地方使用，如下示例：

        ShoppingInfoUtil shoppingInfo=new ShoppingInfoUtil();        shoppingInfo.setTitle("商品标题");        shoppingInfoList.add(shoppingInfo);//        basicParamInit();        holder.rcv_shoppingInfo.setLayoutManager(new SyLinearLayoutManager(context,LinearLayoutManager.VERTICAL,false));        orderShoppingAdapter=new OrderShoppingAdapter(context,shoppingInfoList);        holder.rcv_shoppingInfo.setAdapter(orderShoppingAdapter);

感谢来自http://blog.csdn.net/singleton1900/article/details/48369635