Android自定义ViewGroup多行多列效果
时间：2023-03-01 15:10:40 | 栏目： | 点击：次
本文实例为大家分享了Android自定义ViewGroup多行多列的具体代码，供大家参考，具体内容如下
先看下效果图
每行两个子孩子
每行一个子孩子
实现思路
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
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
}
}
}