This gist demonstrate how to use user-space input driver to handle button event (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 android.view.KeyEvent
import com.google.android.things.contrib.driver.button.Button
import com.google.android.things.contrib.driver.button.ButtonInputDriver

class InputDriver : Activity() {

    //Variables
    val TAG = "Input Driver Activity"
    val mInputDriver = ButtonInputDriver(<GPOI_pin>, Button.LogicState.PRESSED_WHEN_HIGH, KeyEvent.KEYCODE_0)

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        // Register the driver
        mInputDriver.register()
        // Set debounce time for the signal
        mInputDriver.setDebounceDelay(1)
    }

    // On key pressed logic
    override fun onKeyDown(keyCode: Int, event: KeyEvent?): Boolean {
        if (keyCode == KeyEvent.KEYCODE_0) {
            Log.d(TAG, "Key was pressed")
        }
        return super.onKeyDown(keyCode, event)
    }

    // On key released logic
    override fun onKeyUp(keyCode: Int, event: KeyEvent?): Boolean {
        if (keyCode == KeyEvent.KEYCODE_0) {
            Log.d(TAG, "Key was released")
        }
        return super.onKeyUp(keyCode, event)
    }
}