android中RecyclerView添加下划线

public class RecyclerViewDivider extends RecyclerView.ItemDecoration {    private Paint mPaint;    private Drawable mDivider;    private int mDividerHeight = 2;//分割线高度，默认为1px    private int mOrientation;//列表的方向：LinearLayoutManager.VERTICAL或LinearLayoutManager.HORIZONTAL    private static final int[] ATTRS = new int[]{android.R.attr.listDivider};    /**     * 默认分割线：高度为2px，颜色为灰色     *     * @param context     * @param orientation 列表方向     */    public RecyclerViewDivider(Context context, int orientation) {        if (orientation != LinearLayoutManager.VERTICAL && orientation != LinearLayoutManager.HORIZONTAL) {            throw new IllegalArgumentException("请输入正确的参数！");        }        mOrientation = orientation;        final TypedArray a = context.obtainStyledAttributes(ATTRS);        mDivider = a.getDrawable(0);        a.recycle();    }    /**     * 自定义分割线     *     * @param context     * @param orientation 列表方向     * @param drawableId  分割线图片     */    public RecyclerViewDivider(Context context, int orientation, int drawableId) {        this(context, orientation);        mDivider = ContextCompat.getDrawable(context, drawableId);        mDividerHeight = mDivider.getIntrinsicHeight();    }    /**     * 自定义分割线     *     * @param context     * @param orientation   列表方向     * @param dividerHeight 分割线高度     * @param dividerColor  分割线颜色     */    public RecyclerViewDivider(Context context, int orientation, int dividerHeight, int dividerColor) {        this(context, orientation);        mDividerHeight = dividerHeight;        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);        mPaint.setColor(dividerColor);        mPaint.setStyle(Paint.Style.FILL);    }    //获取分割线尺寸    @Override    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {        super.getItemOffsets(outRect, view, parent, state);        outRect.set(0, 0, 0, mDividerHeight);    }    //绘制分割线    @Override    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {        super.onDraw(c, parent, state);        if (mOrientation == LinearLayoutManager.VERTICAL) {            drawVertical(c, parent);        } else {            drawHorizontal(c, parent);        }    }    //绘制横向 item 分割线    private void drawHorizontal(Canvas canvas, RecyclerView parent) {        final int left = parent.getPaddingLeft();        final int right = parent.getMeasuredWidth() - parent.getPaddingRight();        final int childSize = parent.getChildCount();        for (int i = 0; i < childSize; i++) {            final View child = parent.getChildAt(i);            RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) child.getLayoutParams();            final int top = child.getBottom() + layoutParams.bottomMargin;            final int bottom = top + mDividerHeight;            if (mDivider != null) {                mDivider.setBounds(left, top, right, bottom);                mDivider.draw(canvas);            }            if (mPaint != null) {                canvas.drawRect(left, top, right, bottom, mPaint);            }        }    }    //绘制纵向 item 分割线    private void drawVertical(Canvas canvas, RecyclerView parent) {        final int top = parent.getPaddingTop();        final int bottom = parent.getMeasuredHeight() - parent.getPaddingBottom();        final int childSize = parent.getChildCount();        for (int i = 0; i < childSize; i++) {            final View child = parent.getChildAt(i);            RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) child.getLayoutParams();            final int left = child.getRight() + layoutParams.rightMargin;            final int right = left + mDividerHeight;            if (mDivider != null) {                mDivider.setBounds(left, top, right, bottom);                mDivider.draw(canvas);            }            if (mPaint != null) {                canvas.drawRect(left, top, right, bottom, mPaint);            }        }    }}
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