Handling Enter Key on EditText (Kotlin, Android)

Bellow is the simplest solution for above question

    editText.setOnKeyListener(View.OnKeyListener { v, keyCode, event ->
                if (keyCode == KeyEvent.KEYCODE_ENTER && event.action == KeyEvent.ACTION_UP) {
                    //Perform Code 
                    return@OnKeyListener true
                }
                false
            })

This code handles both hardware and software enter key

Step 1 [Important] Specify in XML two attributes:

1. android:imeOptions in order to show the user the correct button to press
2. android:inputType in order to tell the user what text he has to input, numbers text etc

Step 2 Add in your Kotlin file:

yourEditText.setOnEditorActionListener { _, keyCode, event ->
        if (((event?.action ?: -1) == KeyEvent.ACTION_DOWN)
          || keyCode == EditorInfo.IME_PUT_THE_ACTION_YOU_HAVE_SET_UP_IN_STEP_1) {
          
             // Your code here

            return@setOnEditorActionListener true
        }
        return@setOnEditorActionListener false
}

The reason I choose setOnEditorActionListener is because it handles better this action. According to Docs:

   /**
     * Set a special listener to be called when an action is performed
     * on the text view.  This will be called when the enter key is pressed,
     * or when an action supplied to the IME is selected by the user.  Setting
     * this means that the normal hard key event will not insert a newline
     * into the text view, even if it is multi-line; holding down the ALT
     * modifier will, however, allow the user to insert a newline character.
     */

I used the when-expression to check if the enter-button was clicked

edittext.setOnKeyListener { v, keyCode, event ->
        
        when {

            //Check if it is the Enter-Key,      Check if the Enter Key was pressed down
            ((keyCode == KeyEvent.KEYCODE_ENTER) && (event.action == KeyEvent.ACTION_DOWN)) -> {
                
                
                //perform an action here e.g. a send message button click
                sendButton.performClick()

                //return true
                return@setOnKeyListener true
            }
            else -> false
        }


    }