Android Example - Listen to Keyboard Enter Key

Here is a Kotlin example of how to listen to keyboard keys for example Enter Key.

import android.os.Bundle
import android.widget.EditText
import android.view.KeyEvent
import android.widget.Toast

class MainActivity : AppCompatActivity() {

    private lateinit var editText: EditText

    override fun onCreate(savedInstanceState: Bundle?) {
        setContentView(R.layout.activity_main) // Replace with your layout

        editText = findViewById( // Replace with your EditText id

        // Set up the listener for the Enter key press
        editText.setOnKeyListener { _, keyCode, event ->
            if (keyCode == KeyEvent.KEYCODE_ENTER && event.action == KeyEvent.ACTION_DOWN) {
                // Perform your action here
                val text = editText.text.toString()
                Toast.makeText(this, "You entered: $text", Toast.LENGTH_SHORT).show()
                // Clear the EditText
                return@setOnKeyListener true
  1. Import necessary classes:
  • android.view.KeyEvent for handling key events.
  • android.widget.Toast for displaying a simple message.
  1. Initialize the EditText:
  • Get a reference to the EditText using findViewById().
  1. Set up the listener:
  • Use editText.setOnKeyListener() to attach a listener for key events.
  • Inside the listener:
    • Check if the pressed key is KeyEvent.KEYCODE_ENTER and the action is KeyEvent.ACTION_DOWN (key pressed, not released).
    • If it is, perform your desired action. In this example:
    • Get the text from the EditText using editText.text.toString().
    • Display a Toast message showing the entered text.
    • Clear the EditText using editText.setText("").
    • Return true to consume the event, preventing the Enter key from performing its default action (moving to the next line).
  • If the pressed key is not Enter or the action is not down, return false to let the system handle the event.