recyclerview添加分割线的方法

给recyclerview设置分割

recyclerView.addItemDecoration(new MyItemDecoration(this));

public class MyItemDecoration extends RecyclerView.ItemDecoration {

        private  final int[] ATTRS = new int[]{android.R.attr.listDivider};
        private Drawable mDivider;

        public MyItemDecoration(Context context) {
            final TypedArray array = context.obtainStyledAttributes(ATTRS);
            mDivider = array.getDrawable(0);
            array.recycle();
        }

        @Override
        public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
            drawHorizontal(c, parent);
            drawVertical(c, parent);
        }

        // 水平线
        public void drawHorizontal(Canvas c, RecyclerView parent) {

            final int childCount = parent.getChildCount();

            // 在每一个子控件的底部画线
            for (int i = 0; i < childCount; i++) {
                final View child = parent.getChildAt(i);
                final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                        .getLayoutParams();
                final int left = child.getLeft() - params.leftMargin;
                final int right = child.getRight() + params.rightMargin
                        + mDivider.getIntrinsicWidth();
                final int top = child.getBottom() + params.bottomMargin;
                final int bottom = top + mDivider.getIntrinsicHeight();
                mDivider.setBounds(left, top, right, bottom);
                mDivider.draw(c);
            }
        }

        // 竖直线
        public void drawVertical(Canvas c, RecyclerView parent) {

            final int childCount = parent.getChildCount();

            // 在每一个子控件的右侧画线
            for (int i = 0; i < childCount; i++) {
                final View child = parent.getChildAt(i);

                final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                        .getLayoutParams();
                final int top = child.getTop() - params.topMargin;
                final int bottom = child.getBottom() + params.bottomMargin;
                final int left = child.getRight() + params.rightMargin;
                final int right = left + mDivider.getIntrinsicWidth();

                mDivider.setBounds(left, top, right, bottom);
                mDivider.draw(c);
            }
        }

        // Item之间的留白
        @Override
        public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
            outRect.set(0, 0, mDivider.getIntrinsicWidth(), mDivider.getIntrinsicHeight());
        }