我可以在运行时以编程方式设置“android:layout_below”吗？
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Can I Set "android:layout_below" at Runtime Programmatically?
提问by AlanH
Is it possible when creating a RelativeLayoutat runtime to set the equivalent of android:layout_belowprogrammatically?
在运行时创建RelativeLayout时是否可以以android:layout_below编程方式设置等效项？
回答by Rich Schuler
Yes:
是的：
RelativeLayout.LayoutParams params= new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT);
params.addRule(RelativeLayout.BELOW, R.id.below_id);
viewToLayout.setLayoutParams(params);
First, the code creates a new layout params by specifying the height and width. The addRulemethod adds the equivalent of the xml properly android:layout_below. Then you just call View#setLayoutParamson the view you want to have those params.
首先，代码通过指定高度和宽度来创建一个新的布局参数。该addRule方法正确添加了 xml 的等效项android:layout_below。然后你只需调用View#setLayoutParams你想要拥有这些参数的视图。
回答by Hymanofallcode
Alternatively you can use the views current layout parameters and modify them:
或者，您可以使用视图当前布局参数并修改它们：
RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) viewToLayout.getLayoutParams();
params.addRule(RelativeLayout.BELOW, R.id.below_id);
回答by CoolMind
While @Hymanofallcode answer is correct, it can be written in one line:
虽然@Hymanofallcode 答案是正确的，但它可以写成一行：
((RelativeLayout.LayoutParams) viewToLayout.getLayoutParams()).addRule(RelativeLayout.BELOW, R.id.below_id);
回答by Mahmoud
Kotlinversion with infixfunction
带中缀功能的Kotlin版本
infix fun View.below(view: View) {
(this.layoutParams as? RelativeLayout.LayoutParams)?.addRule(RelativeLayout.BELOW, view.id)
}
Then you can write:
然后你可以写：
view1 below view2
Or you can call it as a normal function:
或者您可以将其称为普通函数：
view1.below(view2)
