Change Guideline percentage in constraint layout programmatically

Question

I have a guideline in constraint layout like this

Answer 1

You need to use ConstraintSet object to set layout_constraintGuide_percent in code.

Below is the code to set layout_constraintGuide_percent in code. First you need to create constraint set object, call clone method passing constraintlayout and then call setGuidelinePercent passing guideline id and ratio.

    ConstraintSet constraintSet = new ConstraintSet();
    constraintSet.clone(constraintLayout);

    constraintSet.setGuidelinePercent(R.id.guideline, 0.4f);