android - 当我尝试动态创建 LinearLayout 时，无法重新分配 Val

Question

我正在尝试在 MainActivity.kt 中使用 kotlin 创建新的 LinearLayout

for (i in 0 until tileArr.size){
    var tileLayout: LinearLayout = LinearLayout(this)
    tileLayout.marginBottom = 10
}

当它在线抛出错误Val无法重新分配时:tileLayout.marginBottom = 10

Answer 1

您不能直接修改这些属性，您需要使用LayoutParams。

 for (i in 0 until tileArr.size){
        var tileLayout: ViewGroup = LinearLayout(this)
        val params = <Parent ViewGroup Type>.LayoutParams( // if the parent is FrameLayout, this should be FrameLayout.LayoutParams
            LinearLayout.LayoutParams.WRAP_CONTENT, // modify this if its not wrap_content
            LinearLayout.LayoutParams.WRAP_CONTENT // modify this if its not wrap_content
        )
        params.setMargins(0, 0, 0, 10) // last argument here is the bottom margin
        tileLayout.layoutParams = params
  }