Android自定义ViewGroup多行多列效果

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。