废话不多说,直接上代码.主要思路就是以分割线的最小单位等分全部分割线,然后按需分配份数.
public class MyDecoration extends RecyclerView.ItemDecoration { private int mDividerHeight; private int mDividerWidth; private int mHeaderCounts; private int mFooterCounts; public MyDecoration(int dividerHeightPx, int dividerWidthPx, int headerCounts, int footerCounts) { mDividerHeight = dividerHeightPx; mDividerWidth = dividerWidthPx; mHeaderCounts = headerCounts; mFooterCounts = footerCounts; } @Override public void getItemOffsets(@NonNull Rect outRect, @NonNull View view, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) { super.getItemOffsets(outRect, view, parent, state); int position = parent.getChildAdapterPosition(view); int itemCount = parent.getAdapter().getItemCount(); RecyclerView.LayoutManager layoutManager = parent.getLayoutManager(); if (layoutManager != null && layoutManager instanceof GridLayoutManager) { int realPosition = position - mHeaderCounts; int spanCount = ((GridLayoutManager) layoutManager).getSpanCount(); int column = (realPosition) % spanCount+1; if (spanCount == 1) { return; }else if (position < itemCount - mHeaderCounts - mFooterCounts - spanCount) { outRect.top = 0; outRect.bottom = mDividerHeight; //注意这里一定要先乘 后除 先除数因为小于1然后强转int后会为0 outRect.left = (column-1) * mDividerWidth / spanCount; //左侧为(当前条目数-1)/总条目数*divider宽度 outRect.right = (spanCount-column)* mDividerWidth / spanCount ;//右侧为(总条目数-当前条目数)/总条目数*divider宽度 }else { outRect.top = 0; outRect.bottom = 0; //注意这里一定要先乘 后除 先除数因为小于1然后强转int后会为0 outRect.left = (column-1) * mDividerWidth / spanCount; //左侧为(当前条目数-1)/总条目数*divider宽度 outRect.right = (spanCount-column)* mDividerWidth / spanCount ;//右侧为(总条目数-当前条目数)/总条目数*divider宽度 } }else { outRect.bottom = mDividerHeight; } } }上个图?你看这个分割线,又大又白
