Example how to use user-space driver for button events (Kotlin, Android Things)

Button events with user-space driver.kt

package <package_name>

import android.app.Activity
import android.os.Bundle
import android.util.Log
import com.google.android.things.contrib.driver.button.Button
import java.io.IOException

class UserDriver : Activity() {
    // Variables
    val TAG = "Driver Activity"
    lateinit var mButton: Button

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        // Access the button and listen for events:
        try {
            mButton = Button(<GPIO_pin>, Button.LogicState.PRESSED_WHEN_HIGH)
            mButton.setDebounceDelay(1)

            // Set listener when key state changed
            mButton.setOnButtonEventListener { button, pressed ->
                Log.d(TAG, "Button is pressed")
                Log.d(TAG, "Key state: " + pressed.toString())
            }
        } catch (e: IOException) {
            Log.d(TAG, "Can't configure GPIO")
        }
    }

    override fun onDestroy() {
        super.onDestroy()

        // Close the connection
        mButton.close()
    }
}