这篇文章主要介绍了怎么在Android中自定义上下左右间隔线的相关知识，内容详细易懂，操作简单快捷，具有一定借鉴价值，相信大家阅读完这篇怎么在Android中自定义上下左右间隔线文章都会有所收获，下面我们一起来看看吧。
代码如下：
public class SpaceItemDecoration extends RecyclerView.ItemDecoration {
private int space;
Paint mPaint;
public SpaceItemDecoration(int space) {
this.space = space;
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setColor(0xffededed);
mPaint.setStyle(Paint.Style.FILL);
}
private static final int HORIZONTAL = 355;
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
int itemViewType = parent.getLayoutManager().getItemViewType(view);
if (itemViewType == HORIZONTAL) { //根据ViewType类型来判断是否展示线
outRect.bottom = space;
if (parent.getChildLayoutPosition(view) % 2 == 0) {
outRect.right = space / 2;
outRect.left = space;
} else {
outRect.right = space;
outRect.left = space / 2;
}
}
}
@Override
public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
c.save();
if (parent.getLayoutManager() instanceof GridLayoutManager) {
if ((((GridLayoutManager) parent.getLayoutManager())).getSpanCount() == 2) {
draw(c, parent);
}
}
c.restore();
}
//绘制横向 item 分割线
private void draw(Canvas canvas, RecyclerView parent) {
int childSize = parent.getChildCount();
for (int i = 0; i < childSize; i++) {
View child = parent.getChildAt(i);
RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) child.getLayoutParams();
int left = child.getLeft();
int right = child.getRight();
int top = child.getBottom() + layoutParams.bottomMargin;
int bottom = top + space;
if (mPaint != null) {
canvas.drawRect(left, top, right, bottom, mPaint);//绘制图片下放的水平线
}
if (parent.getChildLayoutPosition(child) % 2 == 0) {
canvas.drawRect(0, child.getTop(), left, child.getBottom() + space, mPaint);//绘制左边图片的左间线
}
top = child.getTop();
bottom = child.getBottom() + space;
left = child.getRight() + layoutParams.rightMargin;
right = left + space;
if (mPaint != null) {
canvas.drawRect(left, top, right, bottom, mPaint);//绘制图片的右间线
}
}
}
}使用方法下:
private void initSpaceLine() {
if (decor == null) {
decor = new SpaceItemDecoration(ViewUtil.dp2px(5));
recycleListView.addItemDecoration(decor);
}
}关于“怎么在Android中自定义上下左右间隔线”这篇文章的内容就介绍到这里，感谢各位的阅读！相信大家对“怎么在Android中自定义上下左右间隔线”知识都有一定的了解，大家如果还想学习更多知识，欢迎关注创新互联行业资讯频道。
