Android自定义ViewGroup多行多列效果 Android自定义ViewGroup多行多列效

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

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每行一个子孩子

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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.layoutParamsval 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 = lvar top = tchildren.forEachIndexed { index, view ->if (index % perLineChild == 0) {left = 0if (index != 0) {top += view.measuredHeighttop+=space}view.layout(left, top, view.measuredWidth + left, top + view.measuredHeight)} else {view.layout(left, top, view.measuredWidth + left, top + view.measuredHeight)}left += view.measuredWidthleft += 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 = 10override 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.layoutParamsval 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 = lvar top = tchildren.forEachIndexed { index, view ->if (index % perLineChild == 0) {left = 0if (index != 0) {top += view.measuredHeighttop+=space}view.layout(left, top, view.measuredWidth + left, top + view.measuredHeight)} else {view.layout(left, top, view.measuredWidth + left, top + view.measuredHeight)}left += view.measuredWidthleft += space}}}

【Android自定义ViewGroup多行多列效果】以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。