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app/src/main/java/com/gh/common/util/MeasureHeightLayoutManager.java

@@ -0,0 +1,62 @@
+package com.gh.common.util;
+
+import android.content.Context;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
+import android.view.View;
+import android.view.ViewGroup;
+
+/**
+ * Created by khy on 2016/8/22.
+ * RecyclerView 自适应高度
+ */
+public class MeasureHeightLayoutManager extends LinearLayoutManager {
+
+    public MeasureHeightLayoutManager(Context context) {
+        super(context);
+    }
+
+    private int[] mMeasuredDimension = new int[1];
+    @Override
+    public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State state,
+                          int widthSpec, int heightSpec) {
+
+        final int heightSize = View.MeasureSpec.getSize(heightSpec);
+
+        int height = 0;
+        for (int i = 0; i < getItemCount(); i++) {
+            measureScrapChild(recycler, i,
+                    View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),
+                    View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),
+                    mMeasuredDimension);
+            height = height + mMeasuredDimension[0];
+
+        }
+        if (height>heightSize){
+            super.onMeasure(recycler, state, widthSpec, heightSpec);
+        }else {
+            setMeasuredDimension(View.MeasureSpec.getSize(widthSpec), 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;
+            return;
+        }
+        super.measureChildWithMargins(view, 0, 0);
+        RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams();
+        int childHeightSpec = ViewGroup.getChildMeasureSpec(
+                heightSpec,
+                getPaddingTop() + getPaddingBottom() + getDecoratedTop(view) + getDecoratedBottom(view),
+                p.height);
+
+        view.measure(0, childHeightSpec);
+        measuredDimension[0] = getDecoratedMeasuredHeight(view) + p.bottomMargin + p.topMargin;
+        recycler.recycleView(view);
+    }
+}