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 } } }
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自学编程网。
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