Android Thingsの概要とKotlinでのLチカ ref: https://qiita.com/akimach/items/07cc61b16068336be86a

file0.txt

import android.app.Activity
import android.os.Build
import android.os.Bundle
import android.util.Log
import com.google.android.things.pio.PeripheralManagerService

class MainActivity : Activity() {
    private val TAG = "MainActivity"
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        Log.d(TAG, "BOARD:" + Build.BOARD)
        Log.d(TAG, "DEVICE:" + Build.DEVICE)
        Log.d(TAG, "BRAND:" + Build.BRAND)
        Log.d(TAG, "PRODUCT:" + Build.PRODUCT)
        Log.d(TAG, "CPU_ABI2:" + Build.CPU_ABI2)
        Log.d(TAG, "HARDWARE:" + Build.HARDWARE)
        val manager = PeripheralManagerService()
        Log.d(TAG, "GPIO:" + manager.gpioList.toString())
        Log.d(TAG, "PWM:" + manager.pwmList.toString())
        Log.d(TAG, "I2C:" + manager.i2cBusList.toString())
        Log.d(TAG, "SPI:" + manager.spiBusList.toString())
        Log.d(TAG, "UART:" + manager.uartDeviceList.toString())
        Log.d(TAG, "I2S:" + manager.i2sDeviceList.toString())
    }
}

file1.txt

D/MainActivity: BOARD:imx7d
D/MainActivity: DEVICE:imx7d_pico
D/MainActivity: BRAND:Things
D/MainActivity: PRODUCT:iot_imx7d_pico
D/MainActivity: CPU_ABI2:armeabi
D/MainActivity: HARDWARE:imx7d
D/MainActivity: GPIO:[GPIO_10, GPIO_128, GPIO_172, GPIO_173, GPIO_174, GPIO_175, GPIO_32, GPIO_33, GPIO_34, GPIO_35, GPIO_37, GPIO_39]
D/MainActivity: PWM:[PWM1, PWM2]
D/MainActivity: I2C:[I2C1]
D/MainActivity: SPI:[SPI3.0, SPI3.1]
D/MainActivity: UART:[UART6]
D/MainActivity: I2S:[I2S3]

file2.txt

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

class MainActivity : Activity() {
    private val TAG = "MainActivity"
    private val LED_PIN_NAME = "GPIO_34"
    private val BUTTON_PIN_NAME = "GPIO_174"
    private lateinit var mLedGpio: Gpio
    private lateinit var mButtonGpio: Gpio

    // Callback for button
    private val mCallback = object : GpioCallback() {
        override fun onGpioEdge(gpio: Gpio?): Boolean {
            Log.i(TAG, "GPIO changed, button pressed")
            val mLedGpio = mLedGpio ?: return false
            try {
                mLedGpio.value = !mLedGpio.value
            } catch (e: IOException) {
                Log.e(TAG, "Error on PeripheralIO API", e)
            }

            return true
        }
    }
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val service = PeripheralManagerService()
        Log.d(TAG, "Available GPIO: " + service.gpioList)
        try {
            // Setup LED
            mLedGpio = service.openGpio(LED_PIN_NAME)
            mLedGpio.setDirection(Gpio.DIRECTION_OUT_INITIALLY_LOW)
            mLedGpio.value = false
            Log.i(TAG, "Setup LED pin")
            // Setup Button
            mButtonGpio = service.openGpio(BUTTON_PIN_NAME)
            mButtonGpio.setDirection(Gpio.DIRECTION_IN)
            mButtonGpio.setEdgeTriggerType(Gpio.EDGE_FALLING)
            mButtonGpio.registerGpioCallback(mCallback)
            Log.i(TAG, "Setup Button pin")
        } catch (e: IOException) {
            Log.e(TAG, "Error on PeripheralIO API", e)
        }
    }
    override fun onDestroy() {
        super.onDestroy()
        mButtonGpio.unregisterGpioCallback(mCallback)
        try {
            mLedGpio.close()
            mButtonGpio.close()
        } catch (e: IOException) {
            Log.e(TAG, "Error on PeripheralIO API", e)
        }
    }
}