How to change the focus to next edit text in android?

Question

The User can enter only one digit in the edit text. if he enters the value in

Answer 1

My kotlin solution for this

private fun addEditTextListener(editText: EditText?, nextEditText: EditText?) {
    editText?.setOnFocusChangeListener { view, focused ->
        if (focused) {
            editText.text = null
        }
    }
    editText?.addTextChangedListener {
        if (it.toString().isNotEmpty()) {
            if (nextEditText != null) {
                nextEditText.requestFocus()
            } else {
                viewModel.confirmCode(
                    binding?.digit1?.text?.toString(),
                    binding?.digit2?.text?.toString(),
                    binding?.digit3?.text?.toString(),
                    binding?.digit4?.text?.toString(),
                )
            }
        }

    }
}

And setting the listeners

 override fun setupViews() {
    addEditTextListener(binding?.digit1, binding?.digit2)
    addEditTextListener(binding?.digit2, binding?.digit3)
    addEditTextListener(binding?.digit3, binding?.digit4)
    addEditTextListener(binding?.digit4, null)
}