RecyclerView的自适应高度

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RecyclerView一般用来全屏显示是最好的，不过有的时候我们也需要用它来做九宫格等控件，这个时候不得不用到自适应高度来显示这部分了！

其实只要我们在装载完成它的数据集之后,在自定义的LayoutManager中监听它的子控件的高度就可以了~！效果如图：

这张图的中间部分就是使用的RecyclerView自适应高度来做的！

下面是Manager的自定义：

package com.cq.cake.util;import android.content.Context;import android.content.res.TypedArray;import android.graphics.drawable.Drawable;import android.support.v4.widget.SwipeRefreshLayout;import android.support.v7.widget.GridLayoutManager;import android.support.v7.widget.RecyclerView;import android.view.ViewTreeObserver;import com.cq.cake.adapter.WeatherAdapter;/** * Created by Small Cake on 2015/12/24. * 复写GridLayoutManager的onMeasure动态设置RecyclerView的高度 */public class ItemGridLayoutManager extends GridLayoutManager {    WeatherAdapter adapter;    TypedArray a;    Drawable mDivider;    ViewTreeObserver obs;    /**     * @param context      上下文     * @param spanCount    列数     * @param adapter      数据适配器     * @param recyclerView 当前的RecyclerView     */    public ItemGridLayoutManager(Context context, int spanCount, WeatherAdapter adapter, final RecyclerView recyclerView) {        super(context, spanCount);        this.adapter = adapter;        a = context.obtainStyledAttributes(new int[]{android.R.attr.listDivider});        mDivider = a.getDrawable(0);        obs = recyclerView.getViewTreeObserver();        obs.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {            @Override            public boolean onPreDraw() {                calculeRecyclerViewFullHeight(recyclerView);                obs.removeOnPreDrawListener(this);                return true;            }        });    }    /**     * 刷新高度，使RecyclerView得高度为wrap_content     */    private void calculeRecyclerViewFullHeight(RecyclerView recyclerView) {        int height = 0;        height = recyclerView.getChildAt(0).getHeight();        int line = adapter.getItemCount() / getSpanCount();        if (adapter.getItemCount() % getSpanCount() > 0) {            line++;        }        SwipeRefreshLayout.LayoutParams params = recyclerView.getLayoutParams();        params.height = height * line + (line - 1) * mDivider.getIntrinsicWidth();        recyclerView.setLayoutParams(params);    }}

希望对需要做自适应高度的同学有所帮助，使用的时候

mRecyclerView.setLayoutManager(new ItemGridLayoutManager(this, 3, adapter, mRecyclerView));

缺点就是参数太多了，希望厉害的大神帮忙改进~！

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