How can I change android chip attributes in using Java

Question

I am using android studio where I placed a chipGroup and programmatically adding chips inside. I am trying to change the chips witch, height & spacing but the attributes I assign have no effect when I run the app.

I generate and assign attributes like this:

ChipGroup  lettersButtons = findViewById(R.id.letterButtons);

String[] letters = genABC();// Generates A-Z array
for (String letter : letters) {
    Chip chip = new Chip(lettersButtons.getContext());
    chip.setText(letter);
    lettersButtons.addView(chip);
    chip.setWidth(50);
    chip.setHeight(50);
    chip.setTextSize(16);
    chip.setChipBackgroundColorResource(R.color.selectionButtons);
    chip.setEnsureMinTouchTargetSize(false);
    chip.setClickable(true);
    chip.setEnsureMinTouchTargetSize(true);
    chip.setCheckedIconVisible(false);
    chip.setChecked(false);
    chip.setOnClickListener(new View.OnClickListener() {...

Below are the letter chips and they do not obey the size definitions above. How can I change the chip width, height, round corners, spacing etc in this way?

Chip letters