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1pxprivate int mOrientation;//列表的方向：LinearLayoutManager.VERTICAL或LinearLayoutManager.HORIZONTALprivate 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@Overridepublic 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@Overridepublic 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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