Add status label to main activity that indicates background service status for debugging (#66)

app/src/main/kotlin/de/timklge/karooheadwind/KarooHeadwindExtension.kt

@@ -94,6 +94,8 @@ class KarooHeadwindExtension : KarooExtension("karoo-headwind", BuildConfig.VERS
         super.onCreate()
 
         karooSystem = KarooSystemService(applicationContext)
+        ServiceStatusSingleton.getInstance().setServiceStatus(true)
+
 
         updateLastKnownGpsJob = CoroutineScope(Dispatchers.IO).launch {
             karooSystem.updateLastKnownGps(this@KarooHeadwindExtension)

app/src/main/kotlin/de/timklge/karooheadwind/ServiceStatusSingleton.kt

@@ -0,0 +1,28 @@
+package de.timklge.karooheadwind
+
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+
+class ServiceStatusSingleton private constructor() {
+    companion object {
+        private var instance: ServiceStatusSingleton? = null
+
+        @Synchronized
+        fun getInstance(): ServiceStatusSingleton {
+            if (instance == null) {
+                instance = ServiceStatusSingleton()
+            }
+            return instance as ServiceStatusSingleton
+        }
+    }
+
+    private val serviceStatus: MutableStateFlow<Boolean> = MutableStateFlow(false)
+
+    fun getServiceStatus(): StateFlow<Boolean> {
+        return serviceStatus
+    }
+
+    fun setServiceStatus(status: Boolean) {
+        serviceStatus.value = status
+    }
+}

app/src/main/kotlin/de/timklge/karooheadwind/screens/WeatherScreen.kt

@@ -27,11 +27,11 @@ import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import de.timklge.karooheadwind.HeadwindStats
 import de.timklge.karooheadwind.KarooHeadwindExtension
 import de.timklge.karooheadwind.R
+import de.timklge.karooheadwind.ServiceStatusSingleton
 import de.timklge.karooheadwind.TemperatureUnit
 import de.timklge.karooheadwind.WeatherInterpretation
 import de.timklge.karooheadwind.datatypes.ForecastDataType
 import de.timklge.karooheadwind.datatypes.WeatherDataType.Companion.timeFormatter
-import de.timklge.karooheadwind.datatypes.WeatherForecastDataType
 import de.timklge.karooheadwind.datatypes.getShortDateFormatter
 import de.timklge.karooheadwind.getGpsCoordinateFlow
 import de.timklge.karooheadwind.streamCurrentWeatherData
@@ -113,7 +113,14 @@ fun WeatherScreen(onFinish: () -> Unit) {
         val lastPositionDistanceStr =
             lastPosition?.let { dist -> " (${dist.roundToInt()} km away)" } ?: ""
 
-        if (stats.failedWeatherRequest != null && (stats.lastSuccessfulWeatherRequest == null || stats.failedWeatherRequest!! > stats.lastSuccessfulWeatherRequest!!)) {
+        val serviceStatus by ServiceStatusSingleton.getInstance().getServiceStatus().collectAsStateWithLifecycle(false)
+
+        if (!serviceStatus){
+            Text(
+                modifier = Modifier.padding(5.dp),
+                text = "Attempting to connect to weather background service..."
+            )
+        } else if (stats.failedWeatherRequest != null && (stats.lastSuccessfulWeatherRequest == null || stats.failedWeatherRequest!! > stats.lastSuccessfulWeatherRequest!!)) {
             val successfulTime = LocalDateTime.ofInstant(
                 Instant.ofEpochMilli(
                     stats.lastSuccessfulWeatherRequest ?: 0