Android 6.0 解決recyclerview 在 scrollview 中不能全部顯示，高度不正常的問題

recycleview和scrollive的配合使用，在6.0以下正常使用。在6.0上高度顯示不全了。查了好久的資料，用過以下的方法都沒用。 

遇到這問題的你，可嘗試以下方法解決。

1、重寫GridLayoutManager

 

public class FullyGridLayoutManager extends GridLayoutManager {
 public FullyGridLayoutManager(Context context, int spanCount) {
     super(context, spanCount);
 }

 public FullyGridLayoutManager(Context context, int spanCount, int orientation, boolean reverseLayout) {
     super(context, spanCount, 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;
     int count = getItemCount();
     int span = getSpanCount();
     for (int i = 0; i < count; i++) {
         measureScrapChild(recycler, i,
                 View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),
                 View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),
                 mMeasuredDimension);

         if (getOrientation() == HORIZONTAL) {
             if (i % span == 0) {
                 width = width + mMeasuredDimension[0];
             }
             if (i == 0) {
                 height = mMeasuredDimension[1];
             }
         } else {
             if (i % span == 0) {
                 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) {
     if (position < getItemCount()) {
         try {
             View view = recycler.getViewForPosition(0);//fix 動態添加時報IndexOutOfBoundsException
             if (view != null) {
                 RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams();
                 int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec,
                         getPaddingLeft() + getPaddingRight(), p.width);
                 int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec,
                         getPaddingTop() + getPaddingBottom(), p.height);
                 view.measure(childWidthSpec, childHeightSpec);
                 measuredDimension[0] = view.getMeasuredWidth() + p.leftMargin + p.rightMargin;
                 measuredDimension[1] = view.getMeasuredHeight() + p.bottomMargin + p.topMargin;
                 recycler.recycleView(view);
             }
         } catch (Exception e) {
             e.printStackTrace();
         }
     }
 }
}

 2、重寫recycleview的onMeasure方法

@Override
    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        int expandSpec = View.MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, View.MeasureSpec.AT_MOST);
        super.onMeasure(widthMeasureSpec, expandSpec);

        ViewGroup.LayoutParams params = getLayoutParams();
        params.height = getMeasuredHeight();

        setNestedScrollingEnabled(false);

    }

前面兩種我都試了沒用。最後一種是直接在recycleview加一層相對佈局就可以了。反正我的問題解決了。

	<RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:descendantFocusability="blocksDescendants">
                <android.support.v7.widget.RecyclerView
                    android:id="@+id/menuRv"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginLeft="@dimen/margin_16"
                    android:layout_marginRight="@dimen/margin_16">

                </android.support.v7.widget.RecyclerView>
        </RelativeLayout>

這個方法可以解決RecycleView與RecycleView嵌套顯示不全和ScrollView和RecycleView嵌套顯示不全。

附上原文鏈接http://www.jianshu.com/p/3815d36fd371?nomobile=yes