Setting rowcount and column count for grid layout dynamically

问题

I am adding linearlayouts to GridLayout dynamically. I want that to be displayed like grid view. Is it possible to calculate how many linear layouts can be placed in one row and set column count for grid layout or i should use gridview to align them automatically.

回答1:

If you want to calculate the column count based on the width of the GridLayout, override the onMeasure method. It provides widthSpec and heightSpec as parameters, from which you can get the actual width and height in pixels using MeasureSpec.getSize(). From there, calculate how many columns you'd like to show based on the width of the GridLayout you just found, and use setColumnCount to make it display that number of columns.

回答2:

Override onMeasure of the GridLayout works. Example (in Kotlin, but should be easily translated to Java):

override fun onMeasure(widthSpec: Int, heightSpec: Int) {
    var childWidth = 0
    for (i in 0 until childCount) {
        val c = getChildAt(i)
        if (c.visibility == View.GONE) {
            continue
        }
        val params = c.layoutParams
        if (params.width>childWidth) childWidth = params.width
    }
    val width = MeasureSpec.getSize(widthSpec)

    columnCount=width/childWidth
    super.onMeasure(widthSpec, heightSpec)
}

I didn't have to requestLayout() despite what @drdaanger mentions in his reply.

来源：https://stackoverflow.com/questions/16062675/setting-rowcount-and-column-count-for-grid-layout-dynamically