Question

recyclerview如何给最后一个item添加分割线

Answer 1

应为 RecyclerView 和 LayoutManager 是分离的，所以没有分割线属性，可以用 RecyclerView.ItemDecoration 进行分割线的绘制。提供一个简单的装饰/** * 分隔线装饰* * @author youmingdot*/public class DividerLine extends RecyclerView.ItemDecoration {/** * 水平方向*/ public static final int HORIZONTAL = LinearLayoutManager.HORIZONTAL;/** * 垂直方向*/ public static final int VERTICAL = LinearLayoutManager.VERTICAL; // 画笔 private Paint paint; // 布局方向 private int orientation; // 分割线颜色 private int color; // 分割线尺寸 private int size; public DividerLine() {this(VERTICAL);} public DividerLine(int orientation) { this.orientation = orientation; paint = new Paint();}@Override public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) { super.onDrawOver(c, parent, state); if (orientation == VERTICAL) { drawHorizontal(c, parent); } else { drawVertical(c, parent);}}/** * 设置分割线颜色* * @param color 颜色*/ public void setColor(int color) { this.color = color;paint.setColor(color);}/** * 设置分割线尺寸* * @param size 尺寸*/ public void setSize(int size) { this.size = size;} // 绘制垂直分割线 protected void drawVertical(Canvas c, RecyclerView parent) { final int top = parent.getPaddingTop(); final int bottom = parent.getHeight() - parent.getPaddingBottom(); final int childCount = parent.getChildCount(); 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.getRight() + params.rightMargin; final int right = left + size; c.drawRect(left, top, right, bottom, paint);}} // 绘制水平分割线 protected void drawHorizontal(Canvas c, RecyclerView parent) { final int left = parent.getPaddingLeft(); final int right = parent.getWidth() - parent.getPaddingRight(); final int childCount = parent.getChildCount(); 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.getBottom() + params.bottomMargin; final int bottom = top + size; c.drawRect(left, top, right, bottom, paint);}}}使用方法DividerLine dividerLine = new DividerLine(DividerLine.VERTICAL);dividerLine.setSize(1);dividerLine.setColor(0xFFDDDDDD);recyclerView.addItemDecoration(dividerLine);