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