RecyclerView在ScrollView中使用wrap_content

RecyclerView如果在ScrollView中使用wrap_content，那么有可能会出现高度为0的情况，为了解决这个问题，我们要手动测量高度并且设置高度，RecyclerView测量工作都是交个LayoutManager的，所以我们要从LayoutManager下手。

以LinearLayoutManager为例子，重写onMeasure方法：

public class AutoSizeLayoutManager extends LinearLayoutManager{    public AutoSizeLayoutManager(Context context) {        super(context);    }    public AutoSizeLayoutManager(Context context, int orientation, boolean reverseLayout) {        super(context, orientation, reverseLayout);    }    public AutoSizeLayoutManager(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {        super(context, attrs, defStyleAttr, defStyleRes);    }    @Override    public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State state, int widthSpec, int heightSpec) {        int itemCount = getItemCount();        if (itemCount == 0) {            super.onMeasure(recycler, state, widthSpec, heightSpec);            return;        }        //测量每个item,高度相加        int measuredWidth = 0;        int measuredHeight = 0;        for (int i = 0; i < itemCount; i++) {            View view = recycler.getViewForPosition(i);            if (view != null) {                measureChild(view, widthSpec, heightSpec);                measuredWidth += view.getMeasuredWidth();                measuredHeight += view.getMeasuredHeight();            }        }        //if (!isAutoWidth){//使用原来的宽度        //    measuredWidth = View.MeasureSpec.getSize(widthSpec);        //}        //if (!isAutoHeight){//使用原来的高度        //    measuredHeight = View.MeasureSpec.getSize(heightSpec);        //}        setMeasuredDimension(measuredWidth, measuredHeight);    }}

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