在运行时创建RelativeLayout时是否可以以编程方式设置android:layout_below
的等效项?
Yes:
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 addRule
method adds the equivalent of the xml properly android:layout_below
. Then you just call View#setLayoutParams
on the view you want to have those params.
Alternatively you can use the views current layout parameters and modify them:
RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) viewToLayout.getLayoutParams();
params.addRule(RelativeLayout.BELOW, R.id.below_id);
虽然@jackofallcode 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);
Kotlin version with infix function
infix fun View.below(view: View) {
(this.layoutParams as? RelativeLayout.LayoutParams)?.addRule(RelativeLayout.BELOW, view.id)
}
Then you can write:
view1 below view2
Or you can call it as a normal function:
view1.below(view2)
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