Add On Body sensor for Wear OS (#2961)

* Add On Body sensor for Wear OS

* Remove unnecessary requirement

common/src/main/res/values/strings.xml

@@ -932,4 +932,6 @@
     <string name="sensor_name_display_sensors">Display Sensors</string>
     <string name="sensor_name_screen_off_timeout">Screen Off Timeout</string>
     <string name="sensor_description_screen_off_timeout">The current duration of idle time before the screen turns off in milliseconds</string>
+    <string name="sensor_name_on_body">On Body Sensor</string>
+    <string name="sensor_description_on_body">Indicates whether the device is on body</string>
 </resources>

wear/src/main/java/io/homeassistant/companion/android/sensors/OnBodySensorManager.kt

@@ -0,0 +1,97 @@
+package io.homeassistant.companion.android.sensors
+
+import android.content.Context
+import android.hardware.Sensor
+import android.hardware.SensorEvent
+import android.hardware.SensorEventListener
+import android.hardware.SensorManager.SENSOR_DELAY_NORMAL
+import android.util.Log
+import androidx.core.content.getSystemService
+import io.homeassistant.companion.android.common.sensors.SensorManager
+import kotlin.math.roundToInt
+import io.homeassistant.companion.android.common.R as commonR
+
+class OnBodySensorManager : SensorManager, SensorEventListener {
+    companion object {
+
+        private const val TAG = "OnBodySensor"
+        private var isListenerRegistered = false
+        private val onBodySensor = SensorManager.BasicSensor(
+            "on_body",
+            "binary_sensor",
+            commonR.string.sensor_name_on_body,
+            commonR.string.sensor_description_on_body,
+            "mdi:account",
+            entityCategory = SensorManager.ENTITY_CATEGORY_DIAGNOSTIC
+        )
+    }
+
+    private lateinit var latestContext: Context
+    private lateinit var mySensorManager: android.hardware.SensorManager
+
+    override fun docsLink(): String {
+        return "https://companion.home-assistant.io/docs/core/sensors#on-body-sensor"
+    }
+    override val enabledByDefault: Boolean
+        get() = false
+
+    override val name: Int
+        get() = commonR.string.sensor_name_on_body
+
+    override fun getAvailableSensors(context: Context): List<SensorManager.BasicSensor> {
+        return listOf(onBodySensor)
+    }
+
+    override fun requiredPermissions(sensorId: String): Array<String> {
+        return emptyArray()
+    }
+
+    override fun hasSensor(context: Context): Boolean {
+        mySensorManager = context.getSystemService()!!
+        return mySensorManager.getDefaultSensor(Sensor.TYPE_LOW_LATENCY_OFFBODY_DETECT, true) != null
+    }
+
+    override fun requestSensorUpdate(context: Context) {
+        latestContext = context
+        updateOnBodySensor()
+    }
+
+    private fun updateOnBodySensor() {
+        if (!isEnabled(latestContext, onBodySensor.id))
+            return
+
+        mySensorManager = latestContext.getSystemService()!!
+
+        val onBodySensors = mySensorManager.getDefaultSensor(Sensor.TYPE_LOW_LATENCY_OFFBODY_DETECT, true)
+        if (onBodySensors != null && !isListenerRegistered) {
+            mySensorManager.registerListener(
+                this,
+                onBodySensors,
+                SENSOR_DELAY_NORMAL
+            )
+            Log.d(TAG, "On body sensor listener registered")
+            isListenerRegistered = true
+        }
+    }
+
+    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?.sensor?.type == Sensor.TYPE_LOW_LATENCY_OFFBODY_DETECT) {
+            val state = event.values[0].roundToInt() != 0
+            Log.d(TAG, "onbody state: $state and ${event.values[0]}")
+            onSensorUpdated(
+                latestContext,
+                onBodySensor,
+                state,
+                if (state) onBodySensor.statelessIcon else "mdi:account-off",
+                mapOf()
+            )
+        }
+
+        // Send update immediately
+        SensorWorker.start(latestContext)
+    }
+}

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

@@ -27,7 +27,8 @@ class SensorReceiver : SensorReceiverBase() {
         const val TAG = "SensorReceiver"
         val MANAGERS = listOf(
             BatterySensorManager(),
-            NetworkSensorManager()
+            NetworkSensorManager(),
+            OnBodySensorManager()
         )
 
         const val ACTION_REQUEST_SENSORS_UPDATE =