How to add different weight to ConstraintLayout views

Question

In my layout, I have a ConstraintLayout containing two TextView elements. They are currently the same size, but I would like them to have different

Answer 1

In XML

Create a horizontal chain, and then use the app:layout_constraintHorizontal_weight attribute:

In Java

Create your views and add them to the parent ConstraintLayout. You will need to give them each an id in order for everything to work; you can use View.generateViewId() or you can define an id resource for them.

// this will be MATCH_CONSTRAINTS width and 48dp height
int height = (int) (getResources().getDisplayMetrics().density * 48);
ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(0, height);

View left = new View(this);
left.setId(R.id.one);
parent.addView(left, params);

View right = new View(this);
right.setId(R.id.two);
parent.addView(right, params);

Then create a ConstraintSet object and create your chain:

ConstraintSet set = new ConstraintSet();
set.clone(parent);

int[] chainIds = { R.id.one, R.id.two }; // the ids you set on your views above
float[] weights = { 6, 4 };
set.createHorizontalChain(ConstraintSet.PARENT_ID, ConstraintSet.LEFT,
                          ConstraintSet.PARENT_ID, ConstraintSet.RIGHT,
                          chainIds, weights, ConstraintSet.CHAIN_SPREAD);

set.applyTo(parent);