Question

如何绘制 RecyclerView 的分隔线

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);