Constraint layout setting runtime constraintStart_toEndOf

Question

I have a constraint app:layout_constraintStart_toStartOf="parent". Runtime I need to change this constraint to app:layout_constraintStart_toEndOf="@+id\myid" .

From my research i found only constraintSet.connect(viewid, ConstraintSet.END, ConstraintSet.PARENT_ID, ConstraintSet.END, 50); . But how to achieve my requirements with this. Any idea on this?

Answer 1

This is in kotlin but it's barely different from Java.

1. Give an ID to the rootLayout.

2. Now, use this code:

   val constraintSet = ConstraintSet()
   constraintSet.clone(rootLayout) //Your rootLayout
   constraintSet.connect(
      yourView.id,                //ID of the view whose position you want to change
      ConstraintSet.START,      
      yourMyIdView.id,            //ID of the correspondent view
      ConstraintSet.END
   )
   constraintSet.applyTo(rootLayout) //Your rootLayout
   

ProTip : You can also animate the change by setting animateChange to true in rootLayout (XML) or you can use a Transition animation which I always prefer.

val transition: Transition = ChangeBounds()
transition.interpolator = AccelerateInterpolator() //Or Any other Interpolator
transition.duration = 700 //Duration
TransitionManager.beginDelayedTransition(rootLayout, transition) //Your rootLayout
constraintSet.applyTo(rootLayout) //Remember to put above 4 lines before this

You can further add Alpha animation it by using yourView.animate().alpha(1f).duration = 700 //1f (0 to 1) is the value and 700 is the duration.

Remember, it is barely different from Java, you just have to add ; at the end possibly.