RecycerView 单独设置每个childView的间隔--使用ItemDecoration

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public class SpacingItemDecoration extends RecyclerView.ItemDecoration {        private int halfSpaceInPx;        public SpacingItemDecoration(int horizontalSpaceInPx) {            halfSpaceInPx = (int) (0.5f * horizontalSpaceInPx);        }        @Override        public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {            super.getItemOffsets(outRect, view, parent, state);            if (parent != null) {//                int childIndex=parent.getChildPosition(view);//deprecated                int childIndex = parent.getChildAdapterPosition(view);                RecyclerView.Adapter adapter = parent.getAdapter();                if (adapter != null) {                    int childCount = adapter.getItemCount();                    outRect.left = halfSpaceInPx;                    outRect.right = halfSpaceInPx;                    if (childIndex == 0) {//the first one，第一个，左边缘间距                        outRect.left = SystemUtil.dpToPx(12);//12dp;                    }                    if (childIndex == childCount - 1) {//the last one,最后一个，右边缘间距                        outRect.right = SystemUtil.dpToPx(12);//12dp                    }                    Loger.d(TAG, "--->getItemOffsets()--childIndex:" + childIndex + ",childCount=" + childCount);                }            }        }    }

使用如下代码添加：

mRecyclerView.addItemDecoration(new SpacingItemDecoration(SystemUtil.dpToPx(10)));//间隔为10dp

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