为什么我的 LayoutParams 不会改变我的布局? [英] Why won't my LayoutParams change my layout?

问题描述

我想在 EditText 旁边显示一个带有建议条目的框.我想我必须设置 LayoutParams(就像 这个问题.

I want to display a box with suggested entries next to an EditText. I figured I'd have to set LayoutParams (like suggested in this question.

然而，无论我尝试什么，框总是在左上角结束.

However, no matter what I try, the box always ends up in the top left corner.

我尝试过的:- 获取 LayoutParams 作为 MarginLayoutParams(它们是)，并设置它们.将它们放回视图中以进行良好测量.- 上面提到的链接中的所有答案

What I tried: - get LayoutParams as MarginLayoutParams (which they are), and set them. Set them back in the view for good measure. - All the answers in the link mentioned above

• 使用 TranslationX 和 -Y 更改位置(有效，但会遇到其他问题，例如状态栏可能不总是 24dp 并且似乎是一个黑客)

                        val layoutParams = box?.layoutParams
                        //val layoutParams = ConstraintLayout.LayoutParams(WRAP_CONTENT, WRAP_CONTENT).apply{
                        //    setMargins(left, top, 0,0)
                        //}
                        if (layoutParams !is ViewGroup.MarginLayoutParams) return@onTextChanged

                        //layoutParams.leftMargin = left
                        layoutParams.marginStart = left
                        layoutParams.topMargin = top
                        box?.layoutParams = layoutParams // Don't think this is necessary 
                        Log.d(TAG, "$layoutParams")

                        // works, but don't like it
                        // box?.translationX = left.toFloat()
                        // box?.translationY = top.toFloat()

                        //doesn't work
                        //box?.setMargins(left, top, right, 1000)

函数View.Setmargins如下:

the function View.Setmargins is as follows:

fun View.setMargins(left: Int, top: Int, right: Int, bottom: Int) {
    if (layoutParams is MarginLayoutParams) {
        val p = layoutParams as MarginLayoutParams
        p.setMargins(left, top, right, bottom)
        requestLayout()
    }
}

我想做的事情的完整来源 这里(上面的片段在第 170 行，稍微编辑了一下以显示我尝试过的内容)

Complete source of the thing I want to do here (snippet above is at line 170, edited it a bit to show things I've tried)

我尝试过的其他事情:将 box 添加到不同的布局，这在所有情况下都会导致在该布局的左上角绘制框

Other things I have tried: add box to different layouts, which in all cases results in the box being drawn in the top-left corner of that layout

推荐答案

对于任何和我有同样问题的人:Mike M. 建议将 LayoutParams 设为 ConstraintLayout.LayoutParams，并设置其 topToTop 和 startToStartConstraintLayout.LayoutParams.PARENT_ID 的字段成功了，即.

For anybody having the same problem as I had: Mike M. 's suggestion to get the LayoutParams as ConstraintLayout.LayoutParams, and also set its topToTop and startToStart fields to ConstraintLayout.LayoutParams.PARENT_ID did the trick, ie.

(box?.layoutParams as ConstraintLayout.LayoutParams).apply{
    topToTop = ConstraintLayout.LayoutParams.PARENT_ID
    startToStart = ConstraintLayout.LayoutParams.PARENT_ID
    topMargin = top
    marginStart = left
}

这篇关于为什么我的 LayoutParams 不会改变我的布局?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！