Sensors API: τι είναι, τύποι αισθητήρων και εργασία με αισθητήρες

val sensorManager = getSystemService(Context.SENSOR_SERVICE) as SensorManager
val sensorList: List<Sensor> = sensorManager.getSensorList(Sensor.TYPE_ALL)
sensorList.forEach { sensor ->
    Log.d("Αισθητήρες", "${sensor.name} — ${sensor.type}")
}

class SensorActivity : Activity(), SensorEventListener {
    override fun onSensorChanged(event: SensorEvent) {
        if (event.sensor.type == Sensor.TYPE_ACCELEROMETER) {
            val x = event.values[0]
            val y = event.values[1]
            val z = event.values[2]
            textView.text = "X: $x, Y: $y, Z: $z"
        }
    }
    override fun onAccuracyChanged(sensor: Sensor, accuracy: Int) {}
}

val sensor = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER)
sensorManager.registerListener(
    this,
    sensor,
    SensorManager.SENSOR_DELAY_GAME
)

fun checkSensorAvailability(type: Int): Boolean {
    val sensorManager =
        getSystemService(Context.SENSOR_SERVICE) as SensorManager
    return sensorManager.getDefaultSensor(type) != null
}

// Χρήση:
if (checkSensorAvailability(Sensor.TYPE_GYROSCOPE)) {
    Log.d("Sensor", "Γυροσκόπιο διαθέσιμο")
}

val gravity = FloatArray(3)
val geomagnetic = FloatArray(3)
val rotationMatrix = FloatArray(9)
val orientation = FloatArray(3)

SensorManager.getRotationMatrix(
    rotationMatrix, null, gravity, geomagnetic
)
SensorManager.getOrientation(rotationMatrix, orientation)
// orientation[0] — azimuth, [1] — pitch, [2] — roll
val azimuthDeg = Math.toDegrees(orientation[0].toDouble())

var initialSteps = 0
var isInitialized = false

override fun onSensorChanged(event: SensorEvent) {
    if (event.sensor.type == Sensor.TYPE_STEP_COUNTER) {
        if (!isInitialized) {
            initialSteps = event.values[0].toInt()
            isInitialized = true
        }
        val currentSteps = event.values[0].toInt()
        val sessionSteps = currentSteps - initialSteps
        Log.d("Βήματα", "Βήματα ανά συνεδρία: $sessionSteps")
    }
}