Add light sensor (#761)

* First commit of light sensor

* Fixes for light sensor

* Lint

* Fix sensor receiver fatal error

* Review comments

app/src/main/java/io/homeassistant/companion/android/sensors/LightSensorManager.kt

@@ -0,0 +1,80 @@
+package io.homeassistant.companion.android.sensors
+
+import android.content.Context
+import android.content.Context.SENSOR_SERVICE
+import android.hardware.Sensor
+import android.hardware.SensorEvent
+import android.hardware.SensorEventListener
+import android.hardware.SensorManager.SENSOR_DELAY_NORMAL
+import io.homeassistant.companion.android.domain.integration.SensorRegistration
+import kotlin.math.roundToInt
+
+class LightSensorManager : SensorManager, SensorEventListener {
+    companion object {
+
+        private const val TAG = "LightSensor"
+        private val lightSensor = SensorManager.BasicSensor(
+            "light_sensor",
+            "sensor",
+            "Light Sensor",
+            "illuminance",
+            "lx"
+        )
+        private var lightReading: String = "unavailable"
+        lateinit var mySensorManager: android.hardware.SensorManager
+    }
+
+    override val name: String
+        get() = "Light Sensors"
+
+    override val availableSensors: List<SensorManager.BasicSensor>
+        get() = listOf(lightSensor)
+
+    override fun requiredPermissions(): Array<String> {
+        return emptyArray()
+    }
+
+    override fun getSensorData(
+        context: Context,
+        sensorId: String
+    ): SensorRegistration<Any> {
+        return when (sensorId) {
+            lightSensor.id -> getLightSensor(context)
+            else -> throw IllegalArgumentException("Unknown sensorId: $sensorId")
+        }
+    }
+
+    private fun getLightSensor(context: Context): SensorRegistration<Any> {
+
+        mySensorManager = context.getSystemService(SENSOR_SERVICE) as android.hardware.SensorManager
+
+        val lightSensors = mySensorManager.getDefaultSensor(Sensor.TYPE_LIGHT) as Sensor
+        if (lightSensors != null) {
+            mySensorManager.registerListener(
+                this,
+                lightSensors,
+                SENSOR_DELAY_NORMAL)
+        }
+
+        val icon = "mdi:brightness-5"
+
+        return lightSensor.toSensorRegistration(
+            lightReading,
+            icon,
+            mapOf()
+        )
+    }
+
+    override fun onAccuracyChanged(p0: Sensor?, p1: Int) {
+        // Nothing happening here but we are required to call onAccuracyChanged for sensor events
+    }
+
+    override fun onSensorChanged(event: SensorEvent?) {
+        if (event != null) {
+            if (event.sensor.type == Sensor.TYPE_LIGHT) {
+                lightReading = event.values[0].roundToInt().toString()
+            }
+        }
+        mySensorManager.unregisterListener(this)
+    }
+}

app/src/main/java/io/homeassistant/companion/android/sensors/SensorReceiver.kt

@@ -24,6 +24,7 @@ class SensorReceiver : BroadcastReceiver() {
             BluetoothSensorManager(),
             NetworkSensorManager(),
             GeocodeSensorManager(),
+            LightSensorManager(),
             NextAlarmManager(),
             PhoneStateSensorManager(),
             StorageSensorManager()