RecyclerView 分间线设置

1、单条横线及横线左右间隔

   LinearLayoutManager linearLayoutManager2 = new LinearLayoutManager(getActivity());        linearLayoutManager2.setOrientation(LinearLayoutManager.VERTICAL);        linearLayoutManager2.setSmoothScrollbarEnabled(true);        linearLayoutManager2.setAutoMeasureEnabled(true);        rvArticle.setHasFixedSize(true);        rvArticle.setLayoutManager(linearLayoutManager2);        int spacingleftRight = getResources().getDimensionPixelSize(R.dimen.s12);        int spacingBottom = getResources().getDimensionPixelSize(R.dimen.s1);        SpacesItemColorDecoration decoration2 = new SpacesItemColorDecoration(spacingleftRight, spacingBottom, getResources().getColor(R.color.colorDivider));        rvArticle.addItemDecoration(decoration2);        rvArticle.setNestedScrollingEnabled(false);        mArticleAdapter = new MainArticleRecyclerAdapter(getActivity(), articleList);        rvArticle.setAdapter(mArticleAdapter);

/** * Created by Administrator on 2017/10/16. * int leftRight = dip2px(2); int topBottom = dip2px(2); rv_content.addItemDecoration(new SpacesItemDecoration(leftRight, topBottom,getResources().getColor(R.color.colorPrimary))); 链接：http://www.jianshu.com/p/3b860938e503 */public class SpacesItemColorDecoration extends RecyclerView.ItemDecoration {    private int leftRight;    private int topBottom;    //color的传入方式是resouce.getcolor    protected Drawable mDivider;    public SpacesItemColorDecoration(int leftRight, int topBottom, int mColor) {        this.leftRight = leftRight;        this.topBottom = topBottom;        if (mColor != 0) {            mDivider = new ColorDrawable(mColor);        }    }    @Override    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {        LinearLayoutManager layoutManager = (LinearLayoutManager) parent.getLayoutManager();        //没有子view或者没有没有颜色直接return        if (mDivider == null || layoutManager.getChildCount() == 0) {            return;        }        int left;        int right;        int top;        int bottom;        final int childCount = parent.getChildCount();        if (layoutManager.getOrientation() == GridLayoutManager.VERTICAL) {            for (int i = 0; i < childCount - 1; i++) {                final View child = parent.getChildAt(i);                final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();                //将有颜色的分割线处于中间位置                float center = (layoutManager.getTopDecorationHeight(child) - topBottom) / 2;                //计算下边的                left = layoutManager.getLeftDecorationWidth(child);                right = parent.getWidth() - layoutManager.getLeftDecorationWidth(child);                top = (int) (child.getBottom() + params.bottomMargin + center);                bottom = top + topBottom;                mDivider.setBounds(left, top, right, bottom);                mDivider.draw(c);            }        } else {            for (int i = 0; i < childCount - 1; i++) {                final View child = parent.getChildAt(i);                final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();                //将有颜色的分割线处于中间位置                float center = (layoutManager.getLeftDecorationWidth(child) - leftRight) / 2;                //计算右边的                left = (int) (child.getRight() + params.rightMargin + center);                right = left + leftRight;                top = layoutManager.getTopDecorationHeight(child);                bottom = parent.getHeight() - layoutManager.getTopDecorationHeight(child);                mDivider.setBounds(left, top, right, bottom);                mDivider.draw(c);            }        }    }    @Override    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {        LinearLayoutManager layoutManager = (LinearLayoutManager) parent.getLayoutManager();        //竖直方向的        if (layoutManager.getOrientation() == LinearLayoutManager.VERTICAL) {            //最后一项需要 bottom            if (parent.getChildAdapterPosition(view) == layoutManager.getItemCount() - 1) {                outRect.bottom = topBottom;            }            outRect.top = topBottom;            outRect.left = leftRight;            outRect.right = leftRight;        } else {            //最后一项需要right            if (parent.getChildAdapterPosition(view) == layoutManager.getItemCount() - 1) {                outRect.right = leftRight;            }            outRect.top = topBottom;            outRect.left = leftRight;            outRect.bottom = topBottom;        }    }}

2、多列分割

  GridLayoutManager gridLayoutManager = new GridLayoutManager(getActivity(), 2);        recyclerViewTbk.setLayoutManager(gridLayoutManager);//        recyclerViewTbk.addItemDecoration(new DividerGridItemDecoration(getActivity()));        int spanCount = 2;//跟布局里面的spanCount属性是一致的        int spacingInPixels = getResources().getDimensionPixelSize(R.dimen.s10);//每一个矩形的间距        boolean includeEdge = true;//如果设置成false那边缘地带就没有间距s        //设置每个item间距        recyclerViewTbk.addItemDecoration(new GridSpacingItemDecoration(spanCount, spacingInPixels, includeEdge));        mTbkAdapter = new MallTbkAdapter(getActivity(), tbkList);        recyclerViewTbk.setAdapter(mTbkAdapter);

public class GridSpacingItemDecoration extends RecyclerView.ItemDecoration {    private int spanCount;    private int spacing;    private boolean includeEdge;    public GridSpacingItemDecoration(int spanCount, int spacing, boolean includeEdge) {        this.spanCount = spanCount;        this.spacing = spacing;        this.includeEdge = includeEdge;    }    @Override    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {        int position = parent.getChildAdapterPosition(view); // item position        int column = position % spanCount; // item column        if (includeEdge) {            outRect.left = spacing - column * spacing / spanCount; // spacing - column * ((1f / spanCount) * spacing)            outRect.right = (column + 1) * spacing / spanCount; // (column + 1) * ((1f / spanCount) * spacing)            if (position < spanCount) { // top edge                outRect.top = spacing;            }            outRect.bottom = spacing; // item bottom        } else {            outRect.left = column * spacing / spanCount; // column * ((1f / spanCount) * spacing)            outRect.right = spacing - (column + 1) * spacing / spanCount; // spacing - (column + 1) * ((1f /    spanCount) * spacing)            if (position >= spanCount) {                outRect.top = spacing; // item top            }        }    }}