Android 6.0 解决recyclerview 在 scrollview 中不能全部显示，高度不正常的问题

最新推荐文章于 2024-07-08 02:32:50 发布

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本文提供了解决 RecyclerView 在 Android 6.0 上显示不全的问题。通过重写 GridLayoutManager 和 RecyclerView 的 onMeasure 方法，或者在 RecyclerView 外层添加 RelativeLayout 来解决高度显示不全的情况。

recycleview和scrollive的配合使用，在6.0以下正常使用。在6.0上高度显示不全了。
查了好久的资料，用过以下的方法都没用。遇到这问题的你，可尝试以下方法解决。

重写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 动态添加时报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();
         }
     }
 }
}

重写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);

    }

前面两种我都试了没用。最后一种是直接在recycleview加一层相对布局就可以了。反正我的问题解决了。

  <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>