Gist which demonstrate how to make blinking LED with peripheral manager and handler (Kotlin, Android Things)

Blinking LED with handler.kt

package <package_name>

import android.app.Activity
import android.os.Bundle
import android.os.Handler
import android.util.Log
import com.google.android.things.pio.Gpio
import com.google.android.things.pio.PeripheralManager
import java.io.IOException

class BlinkingLED : Activity() {

    // Variables
    val TAG = "Blinking LED Activity"
    val INTERVAL_BETWEEN_BLINKS_MS = 1000
    val LED_PIN_NAME = <GPIO_pin>
    val mHandler = Handler()
    val manager = PeripheralManager.getInstance()
    lateinit var mLedGpio: Gpio

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

        try {
            // Open GPIO connection
            mLedGpio = manager.openGpio(LED_PIN_NAME)
            // Configure as an output.
            mLedGpio.setDirection(Gpio.DIRECTION_OUT_INITIALLY_HIGH)
            // Repeat using a handler.
            mHandler.post(mBlinkRunnable)
        } catch (e: IOException) {
            Log.e(TAG, "Error on Peripheral IO API", e)
        }
    }

    override fun onDestroy() {
        super.onDestroy()

        try {
            // Remove handler events on close.
            mHandler.removeCallbacks(mBlinkRunnable)
            // Close the resource.
            mLedGpio.close()
        } catch (e: IOException) {
            Log.e(TAG, "Error on PeripheralIO API", e)
        }
    }


    private val mBlinkRunnable = object : Runnable {
        override fun run() {

            try {
                // Toggle the LED state
                Log.d(TAG, mLedGpio.value.toString())
                mLedGpio.value = !mLedGpio.value

                // Schedule another event after delay.
                mHandler.postDelayed(this, INTERVAL_BETWEEN_BLINKS_MS.toLong())
            } catch (e: IOException) {
                Log.e(TAG, "Error on PeripheralIO API", e)
            }
        }
    }
}