How to listen for Key input from User?

Question

I managed to get a Alert Dialog to pop up with a editText to handle input from the user. How would i handle the submit process when they hit Enter on the keyboard? I would like to refrain from using a button to submit and change the text. Hopefully i gave enough detail as i am still quite new to this. Thanks for your time.

Phone App Pic

The Alert Dialog:

(1..912).forEach {
        val id = resources.getIdentifier("Price$it", "id", packageName)
        val tv = findViewById<TextView>(id)
        tv.setOnLongClickListener {

            //Alert Window
            val alertDialog = AlertDialog.Builder(this@MainActivity)
            alertDialog.setTitle("NEW PRICE")
            val input = EditText(this@MainActivity)
            val lp = LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.MATCH_PARENT,
                LinearLayout.LayoutParams.MATCH_PARENT
            )
            input.layoutParams = lp
            alertDialog.setView(input).show()
            return@setOnLongClickListener true

        }
    }

UPDATE:

(1..912).forEach {
        val id = resources.getIdentifier("Price$it", "id", packageName)
        val tv = findViewById<TextView>(id)
        tv.setOnLongClickListener {

            //Alert Window
            val alertDialog = AlertDialog.Builder(this@MainActivity)
            alertDialog.setTitle("NEW PRICE")
            val input = EditText(this@MainActivity)
            //Alert Submit on Enter
            input.setOnKeyListener { v, keyCode, event ->
                if (event.action == KeyEvent.ACTION_DOWN && keyCode == KeyEvent.KEYCODE_ENTER) {
                    // Input changes text
                    tv.text = input.text
                    when {
                        tv.text.startsWith("-") -> tv.setTextColor(Color.RED)
                        tv.text.startsWith("+") -> tv.setTextColor(Color.GREEN)
                    else -> {
                        tv.text = "_"
                        tv.setTextColor(Color.DKGRAY)
                    }
                    }
                    // Hide Keyboard
                    // Save Price Table
                }
                false
            }

Answer 1

You can set your custom OnKeyListener for the EditText:

val input = EditText(this@MainActivity)
input.setOnKeyListener(View.OnKeyListener { v, keyCode, event ->
    if (event.action == KeyEvent.ACTION_DOWN && keyCode == KeyEvent.KEYCODE_ENTER) {
        // your code here
        true
    }
    false
})