本篇文章为大家展示了如何在Android中自定义上下左右间隔线，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。
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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);
}
}上述内容就是如何在Android中自定义上下左右间隔线，你们学到知识或技能了吗？如果还想学到更多技能或者丰富自己的知识储备，欢迎关注创新互联行业资讯频道。
