Make child height update height of his siblings

user_4858147 0
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Is there any way to define childHeight as more important than its siblings and propagate its size to (less important) siblings.

Consider this layout

<RelativeLayout
  match_parent,match_parent>

    <FrameLayout 
      match_parent,match_parent>

        <ViewA
          this view size is important and its siblings should have same size, set on Runtime.
          layout_gravity="center"/>

        <ViewB
          match_parent,match_parent
          layout_gravity="center"
          (should have the size of ViewB)  />

    </FrameLayout>

</RelativeLayout>

I know how to do it using ConstrainLayout but I am asking just out of curiosity

<ConstraintLayout>
      <ViewA
       wrap_content,wrap_content
       constraint_to="parent"/>

       <ViewB
          0dp,0dp
          constraint_to="ViewA"
          layout_gravity="center"
          (should have the size of ViewA)  />
</ConstraintLayout>

Use case I have cameraView (ViewA) and cameraOverlay (ViewB). ViewA changes it's size according to user preference (16:9 | 4:3...) and ViewB (has some alpha) must always overlap whole ViewA.

Edit: Forgot to add that I don't want to change size of viewB manually

android-layout android
1 Answers

I understand that you change the height/width of viewA programmatically. So you have the height and width resources available.

To others who have the same problem, to set the height of the View:

viewB.getLayoutParams().height = heightViewA;
viewB.getLayoutParams().width = widthViewB;

Hope this helps.

Important. If you're setting the height after the layout has already been 'laid out', make sure you also call:

viewB.requestLayout()

Another option is to use RelativeLayout

<RelativeLayout
       wrap_content,wrap_content    
>
      <ViewA
       wrap_content,wrap_content
       constraint_to="parent"/>

       <ViewB
          match_parent,match_parent
          constraint_to="ViewA"
          layout_gravity="center"
          (should have the size of ViewA)  />
</RelativeLayout>

And in RelativeLayout you can overlay them.

user_60911440
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