这篇文章主要介绍“Android怎么自定义ViewGroup多行多列效果”，在日常操作中，相信很多人在Android怎么自定义ViewGroup多行多列效果问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”Android怎么自定义ViewGroup多行多列效果”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！
先看下效果图
每行两个子孩子
每行一个子孩子
自定义viewGroup,实现测量和布局，使控件适应业务场景。
测量
根据父控件的宽度，平均分给每个子孩子固定的宽度。高度就是行数乘以一个子孩子的高度，再加上空隙的高度。
根据子孩子个数计算行数
计算
安全
数据库
网络和加速
企业服务
val rows = if (childCount % perLineChild == 0) {
childCount / perLineChild
} else {
childCount / perLineChild + 1
}代码示例
override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
val width = MeasureSpec.getSize(widthMeasureSpec)
for (i in 0 until childCount) {
val child: View = getChildAt(i)
if (child.visibility != GONE) {
val lp = child.layoutParams
val childWidthMeasureSpec = getChildMeasureSpec(
widthMeasureSpec,
0, (width - (perLineChild - 1) * space) / perLineChild
)
val childHeightMeasureSpec = getChildMeasureSpec(
heightMeasureSpec,
0, lp.height
)
child.measure(childWidthMeasureSpec, childHeightMeasureSpec)
}
}
val rows = if (childCount % perLineChild == 0) {
childCount / perLineChild
} else {
childCount / perLineChild + 1
}
if (childCount > 0) {
setMeasuredDimension(
width,
getChildAt(0).measuredHeight * rows + (rows - 1) * space
)
}
}布局
需要注意摆放的顺序和位置，每行摆放固定的个数，达到个数之后换行继续摆放
代码示例
override fun onLayout(changed: Boolean, l: Int, t: Int, r: Int, b: Int) {
var left = l
var top = t
children.forEachIndexed { index, view ->
if (index % perLineChild == 0) {
left = 0
if (index != 0) {
top += view.measuredHeight
top+=space
}
view.layout(left, top, view.measuredWidth + left, top + view.measuredHeight)
} else {
view.layout(left, top, view.measuredWidth + left, top + view.measuredHeight)
}
left += view.measuredWidth
left += space
}
}完整代码
class MultiLineViewG @JvmOverloads constructor(
context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
) : ViewGroup(context, attrs, defStyleAttr) {
var perLineChild = 2
/**
* 子孩子之间的空隙
*/
var space = 10
override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
val width = MeasureSpec.getSize(widthMeasureSpec)
for (i in 0 until childCount) {
val child: View = getChildAt(i)
if (child.visibility != GONE) {
val lp = child.layoutParams
val childWidthMeasureSpec = getChildMeasureSpec(
widthMeasureSpec,
0, (width - (perLineChild - 1) * space) / perLineChild
)
val childHeightMeasureSpec = getChildMeasureSpec(
heightMeasureSpec,
0, lp.height
)
child.measure(childWidthMeasureSpec, childHeightMeasureSpec)
}
}
val rows = if (childCount % perLineChild == 0) {
childCount / perLineChild
} else {
childCount / perLineChild + 1
}
if (childCount > 0) {
setMeasuredDimension(
width,
getChildAt(0).measuredHeight * rows + (rows - 1) * space
)
}
}
override fun onLayout(changed: Boolean, l: Int, t: Int, r: Int, b: Int) {
var left = l
var top = t
children.forEachIndexed { index, view ->
if (index % perLineChild == 0) {
left = 0
if (index != 0) {
top += view.measuredHeight
top+=space
}
view.layout(left, top, view.measuredWidth + left, top + view.measuredHeight)
} else {
view.layout(left, top, view.measuredWidth + left, top + view.measuredHeight)
}
left += view.measuredWidth
left += space
}
}
}到此，关于“Android怎么自定义ViewGroup多行多列效果”的学习就结束了，希望能够解决大家的疑惑。理论与实践的搭配能更好的帮助大家学习，快去试试吧！若想继续学习更多相关知识，请继续关注亿速云网站，小编会继续努力为大家带来更多实用的文章！
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