Constraintlayout's constraintset dynamically modifies constraints

Use

1. establish ConstraintSet object

   ConstraintSet set = new ConstraintSet();
   set.clone(constraintLayout);
   //  or  
   // set.clone(this, R.layout.main_activity);
   

2. Constraint element

   set.connect(v1.getId(), ConstraintSet.TOP, ConstraintSet.PARENT_ID, ConstraintSet.BOTTOM);
   set.connect(v2.getId(), ConstraintSet.TOP, v1.getId(), ConstraintSet.BOTTOM, dp2px(16));
   set.applyTo(constraintLayout);
   

Be careful : If there is View Hide Show operation , Be sure to display the operation View.setVisibility(View.VISIBLE) Not in 1、2 Execute in the middle of step , Because when establishing constraints , The previous position constraints may be changed , Thus, it shows that it may fail .

Official documents