Initial commit: Helios Tracker location responder app

Minimal Android app that receives LOCATE commands via ntfy push
notifications and replies with GPS coordinates + battery level.
Uses WorkManager, FusedLocationProvider, and OkHttp.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/.gitignore

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+/build

app/build.gradle.kts

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+plugins {
+    alias(libs.plugins.android.application)
+    alias(libs.plugins.kotlin.compose)
+}
+
+android {
+    namespace = "com.example.helios_location_finder"
+    compileSdk {
+        version = release(36) {
+            minorApiLevel = 1
+        }
+    }
+
+    defaultConfig {
+        applicationId = "com.example.helios_location_finder"
+        minSdk = 24
+        targetSdk = 36
+        versionCode = 1
+        versionName = "1.0"
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+
+    buildFeatures {
+        compose = true
+    }
+}
+
+dependencies {
+    implementation(libs.androidx.core.ktx)
+
+    // Compose
+    implementation(platform(libs.compose.bom))
+    implementation(libs.compose.ui)
+    implementation(libs.compose.ui.tooling.preview)
+    implementation(libs.compose.material3)
+    implementation(libs.activity.compose)
+    debugImplementation(libs.compose.ui.tooling)
+
+    // WorkManager
+    implementation(libs.work.runtime.ktx)
+
+    // Google Play Services Location
+    implementation(libs.play.services.location)
+
+    // OkHttp
+    implementation(libs.okhttp)
+
+    // Coroutines for Play Services .await()
+    implementation(libs.coroutines.play.services)
+
+    testImplementation(libs.junit)
+    androidTestImplementation(libs.androidx.junit)
+    androidTestImplementation(libs.androidx.espresso.core)
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

app/src/androidTest/java/com/example/helios_location_finder/ExampleInstrumentedTest.kt

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+package com.example.helios_location_finder
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("com.example.helios_location_finder", appContext.packageName)
+    }
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
+    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
+    <uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />
+    <uses-permission android:name="android.permission.INTERNET" />
+
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.Helioslocationfinder"
+        tools:targetApi="31">
+
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:theme="@style/Theme.Helioslocationfinder">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+        <receiver
+            android:name=".NtfyReceiver"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="io.heckel.ntfy.MESSAGE_RECEIVED" />
+            </intent-filter>
+        </receiver>
+
+    </application>
+
+</manifest>

app/src/main/java/com/example/helios_location_finder/LocationWorker.kt

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+package com.example.helios_location_finder
+
+import android.Manifest
+import android.content.Context
+import android.content.Intent
+import android.content.IntentFilter
+import android.content.pm.PackageManager
+import android.location.Location
+import android.os.BatteryManager
+import android.os.Looper
+import android.util.Log
+import androidx.core.content.ContextCompat
+import androidx.work.CoroutineWorker
+import androidx.work.WorkerParameters
+import com.google.android.gms.location.LocationCallback
+import com.google.android.gms.location.LocationRequest
+import com.google.android.gms.location.LocationResult
+import com.google.android.gms.location.LocationServices
+import com.google.android.gms.location.Priority
+import com.google.android.gms.tasks.CancellationTokenSource
+import kotlinx.coroutines.suspendCancellableCoroutine
+import kotlinx.coroutines.tasks.await
+import kotlinx.coroutines.withTimeoutOrNull
+import okhttp3.MediaType.Companion.toMediaType
+import okhttp3.OkHttpClient
+import okhttp3.Request
+import okhttp3.RequestBody.Companion.toRequestBody
+import kotlin.coroutines.resume
+
+class LocationWorker(
+    context: Context,
+    params: WorkerParameters
+) : CoroutineWorker(context, params) {
+
+    companion object {
+        private const val TAG = "LocationWorker"
+        private const val NTFY_BASE_URL = "https://ntfy.sh/"
+        private const val LOCATION_TIMEOUT_MS = 30_000L
+    }
+
+    private val client = OkHttpClient()
+
+    override suspend fun doWork(): Result {
+        Log.d(TAG, "LocationWorker started")
+
+        val replyTopic = Prefs.getReplyTopic(applicationContext)
+        if (replyTopic.isBlank()) {
+            Log.e(TAG, "No reply topic configured")
+            return Result.failure()
+        }
+        val replyUrl = NTFY_BASE_URL + replyTopic
+
+        if (!hasLocationPermission()) {
+            Log.e(TAG, "No location permission")
+            sendMessage(replyUrl, "Error: Location permission not granted")
+            return Result.failure()
+        }
+
+        val locationClient = LocationServices.getFusedLocationProviderClient(applicationContext)
+
+        try {
+            // Strategy 1: getCurrentLocation
+            val cancellationSource = CancellationTokenSource()
+            var location: Location? = try {
+                withTimeoutOrNull(LOCATION_TIMEOUT_MS) {
+                    locationClient.getCurrentLocation(
+                        Priority.PRIORITY_BALANCED_POWER_ACCURACY,
+                        cancellationSource.token
+                    ).await()
+                }
+            } catch (e: Exception) {
+                Log.w(TAG, "getCurrentLocation failed: ${e.message}")
+                null
+            } finally {
+                cancellationSource.cancel()
+            }
+
+            // Strategy 2: getLastLocation as fallback
+            if (location == null) {
+                Log.d(TAG, "getCurrentLocation returned null, trying getLastLocation")
+                location = try {
+                    locationClient.lastLocation.await()
+                } catch (e: Exception) {
+                    Log.w(TAG, "getLastLocation failed: ${e.message}")
+                    null
+                }
+            }
+
+            // Strategy 3: requestLocationUpdates as last resort
+            if (location == null) {
+                Log.d(TAG, "getLastLocation returned null, trying requestLocationUpdates")
+                location = withTimeoutOrNull(LOCATION_TIMEOUT_MS) {
+                    requestSingleUpdate(locationClient)
+                }
+            }
+
+            if (location == null) {
+                Log.w(TAG, "All location strategies failed")
+                sendMessage(replyUrl, "Error: Could not determine location")
+                return Result.retry()
+            }
+
+            val battery = getBatteryLevel()
+            val payload = "Lat: ${location.latitude}, Lon: ${location.longitude}, Battery: $battery%"
+
+            Log.d(TAG, "Sending location: $payload")
+            sendMessage(replyUrl, payload)
+
+            return Result.success()
+        } catch (e: SecurityException) {
+            Log.e(TAG, "SecurityException", e)
+            sendMessage(replyUrl, "Error: SecurityException - ${e.message}")
+            return Result.failure()
+        } catch (e: Exception) {
+            Log.e(TAG, "Unexpected error", e)
+            sendMessage(replyUrl, "Error: ${e.message}")
+            return Result.retry()
+        }
+    }
+
+    private suspend fun requestSingleUpdate(
+        locationClient: com.google.android.gms.location.FusedLocationProviderClient
+    ): Location = suspendCancellableCoroutine { cont ->
+        val request = LocationRequest.Builder(
+            Priority.PRIORITY_BALANCED_POWER_ACCURACY, 1000L
+        ).setMaxUpdates(1).build()
+
+        val callback = object : LocationCallback() {
+            override fun onLocationResult(result: LocationResult) {
+                locationClient.removeLocationUpdates(this)
+                val loc = result.lastLocation
+                if (loc != null && cont.isActive) {
+                    cont.resume(loc)
+                }
+            }
+        }
+
+        locationClient.requestLocationUpdates(request, callback, Looper.getMainLooper())
+
+        cont.invokeOnCancellation {
+            locationClient.removeLocationUpdates(callback)
+        }
+    }
+
+    private fun hasLocationPermission(): Boolean {
+        return ContextCompat.checkSelfPermission(
+            applicationContext, Manifest.permission.ACCESS_FINE_LOCATION
+        ) == PackageManager.PERMISSION_GRANTED || ContextCompat.checkSelfPermission(
+            applicationContext, Manifest.permission.ACCESS_COARSE_LOCATION
+        ) == PackageManager.PERMISSION_GRANTED
+    }
+
+    private fun getBatteryLevel(): Int {
+        val intentFilter = IntentFilter(Intent.ACTION_BATTERY_CHANGED)
+        val batteryStatus = applicationContext.registerReceiver(null, intentFilter)
+        val level = batteryStatus?.getIntExtra(BatteryManager.EXTRA_LEVEL, -1) ?: -1
+        val scale = batteryStatus?.getIntExtra(BatteryManager.EXTRA_SCALE, -1) ?: -1
+        return if (level >= 0 && scale > 0) (level * 100 / scale) else -1
+    }
+
+    private fun sendMessage(url: String, text: String) {
+        try {
+            val request = Request.Builder()
+                .url(url)
+                .post(text.toRequestBody("text/plain".toMediaType()))
+                .build()
+
+            client.newCall(request).execute().use { response ->
+                Log.d(TAG, "POST response: ${response.code}")
+            }
+        } catch (e: Exception) {
+            Log.e(TAG, "Failed to send message", e)
+        }
+    }
+}

app/src/main/java/com/example/helios_location_finder/MainActivity.kt

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+package com.example.helios_location_finder
+
+import android.Manifest
+import android.content.pm.PackageManager
+import android.os.Build
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material3.Button
+import androidx.compose.material3.ButtonDefaults
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.OutlinedTextFieldDefaults
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.material3.darkColorScheme
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.unit.dp
+import androidx.core.content.ContextCompat
+
+private val Orange = Color(0xFFFF6D00)
+private val OrangeLight = Color(0xFFFFAB40)
+private val DarkSurface = Color(0xFF1A1A1A)
+
+private val HeliosDarkColorScheme = darkColorScheme(
+    primary = Orange,
+    onPrimary = Color.Black,
+    secondary = OrangeLight,
+    onSecondary = Color.Black,
+    background = Color.Black,
+    surface = DarkSurface,
+    onBackground = Color.White,
+    onSurface = Color.White,
+    error = Color(0xFFCF6679),
+)
+
+class MainActivity : ComponentActivity() {
+
+    private val foregroundGranted = mutableStateOf(false)
+    private val backgroundGranted = mutableStateOf(false)
+
+    private val foregroundPermissionLauncher = registerForActivityResult(
+        ActivityResultContracts.RequestMultiplePermissions()
+    ) { permissions ->
+        foregroundGranted.value = permissions.values.any { it }
+        checkPermissions()
+    }
+
+    private val backgroundPermissionLauncher = registerForActivityResult(
+        ActivityResultContracts.RequestPermission()
+    ) { granted ->
+        backgroundGranted.value = granted
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        checkPermissions()
+
+        val listenTopic = mutableStateOf(Prefs.getListenTopic(this))
+        val replyTopic = mutableStateOf(Prefs.getReplyTopic(this))
+
+        setContent {
+            MaterialTheme(colorScheme = HeliosDarkColorScheme) {
+                Surface(
+                    modifier = Modifier.fillMaxSize(),
+                    color = MaterialTheme.colorScheme.background
+                ) {
+                    StatusScreen(
+                        foregroundGranted = foregroundGranted.value,
+                        backgroundGranted = backgroundGranted.value,
+                        listenTopic = listenTopic.value,
+                        replyTopic = replyTopic.value,
+                        onListenTopicChange = { value ->
+                            listenTopic.value = value
+                            Prefs.setListenTopic(this, value)
+                        },
+                        onReplyTopicChange = { value ->
+                            replyTopic.value = value
+                            Prefs.setReplyTopic(this, value)
+                        },
+                        onRequestForegroundPermission = { requestForegroundPermissions() },
+                        onRequestBackgroundPermission = { requestBackgroundPermission() }
+                    )
+                }
+            }
+        }
+    }
+
+    override fun onResume() {
+        super.onResume()
+        checkPermissions()
+    }
+
+    private fun checkPermissions() {
+        foregroundGranted.value = ContextCompat.checkSelfPermission(
+            this, Manifest.permission.ACCESS_FINE_LOCATION
+        ) == PackageManager.PERMISSION_GRANTED || ContextCompat.checkSelfPermission(
+            this, Manifest.permission.ACCESS_COARSE_LOCATION
+        ) == PackageManager.PERMISSION_GRANTED
+
+        backgroundGranted.value = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+            ContextCompat.checkSelfPermission(
+                this, Manifest.permission.ACCESS_BACKGROUND_LOCATION
+            ) == PackageManager.PERMISSION_GRANTED
+        } else {
+            true
+        }
+    }
+
+    private fun requestForegroundPermissions() {
+        foregroundPermissionLauncher.launch(
+            arrayOf(
+                Manifest.permission.ACCESS_FINE_LOCATION,
+                Manifest.permission.ACCESS_COARSE_LOCATION
+            )
+        )
+    }
+
+    private fun requestBackgroundPermission() {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+            backgroundPermissionLauncher.launch(Manifest.permission.ACCESS_BACKGROUND_LOCATION)
+        }
+    }
+}
+
+@Composable
+fun StatusScreen(
+    foregroundGranted: Boolean,
+    backgroundGranted: Boolean,
+    listenTopic: String,
+    replyTopic: String,
+    onListenTopicChange: (String) -> Unit,
+    onReplyTopicChange: (String) -> Unit,
+    onRequestForegroundPermission: () -> Unit,
+    onRequestBackgroundPermission: () -> Unit
+) {
+    val textFieldColors = OutlinedTextFieldDefaults.colors(
+        focusedBorderColor = Orange,
+        unfocusedBorderColor = OrangeLight.copy(alpha = 0.5f),
+        focusedLabelColor = Orange,
+        cursorColor = Orange,
+    )
+
+    Column(
+        modifier = Modifier
+            .fillMaxSize()
+            .padding(24.dp),
+        horizontalAlignment = Alignment.CenterHorizontally,
+        verticalArrangement = Arrangement.Center
+    ) {
+        Text(
+            text = "Helios Tracker",
+            style = MaterialTheme.typography.headlineMedium,
+            color = Orange
+        )
+
+        Spacer(modifier = Modifier.height(32.dp))
+
+        val statusText = when {
+            !foregroundGranted -> "Standort-Berechtigung fehlt"
+            !backgroundGranted -> "Hintergrund-Standort fehlt"
+            else -> "Bereit"
+        }
+        val isReady = foregroundGranted && backgroundGranted
+
+        Text(
+            text = "Status: $statusText",
+            style = MaterialTheme.typography.bodyLarge,
+            color = if (isReady) Orange else MaterialTheme.colorScheme.error
+        )
+
+        Spacer(modifier = Modifier.height(24.dp))
+
+        OutlinedTextField(
+            value = listenTopic,
+            onValueChange = onListenTopicChange,
+            label = { Text("Empfangs-Topic (lauschen)") },
+            placeholder = { Text("z.B. mein_geraet_locate") },
+            singleLine = true,
+            modifier = Modifier.fillMaxWidth(),
+            colors = textFieldColors
+        )
+
+        Spacer(modifier = Modifier.height(12.dp))
+
+        OutlinedTextField(
+            value = replyTopic,
+            onValueChange = onReplyTopicChange,
+            label = { Text("Antwort-Topic (senden)") },
+            placeholder = { Text("z.B. mein_geraet_reply") },
+            singleLine = true,
+            modifier = Modifier.fillMaxWidth(),
+            colors = textFieldColors
+        )
+
+        Spacer(modifier = Modifier.height(16.dp))
+
+        Text(
+            text = "Die App lauscht auf ntfy-Nachrichten mit dem Inhalt \"LOCATE\" " +
+                   "auf dem Empfangs-Topic und antwortet mit dem Standort auf dem Antwort-Topic.",
+            style = MaterialTheme.typography.bodyMedium,
+            color = Color.LightGray
+        )
+
+        if (!foregroundGranted) {
+            Spacer(modifier = Modifier.height(24.dp))
+            Button(
+                onClick = onRequestForegroundPermission,
+                colors = ButtonDefaults.buttonColors(containerColor = Orange)
+            ) {
+                Text("Standort-Berechtigung erteilen", color = Color.Black)
+            }
+        } else if (!backgroundGranted) {
+            Spacer(modifier = Modifier.height(24.dp))
+            Button(
+                onClick = onRequestBackgroundPermission,
+                colors = ButtonDefaults.buttonColors(containerColor = Orange)
+            ) {
+                Text("Hintergrund-Standort erlauben", color = Color.Black)
+            }
+            Spacer(modifier = Modifier.height(8.dp))
+            Text(
+                text = "Damit die App auf LOCATE-Anfragen reagieren kann, " +
+                       "muss \"Immer erlauben\" gewaehlt werden.",
+                style = MaterialTheme.typography.bodySmall,
+                color = Color.Gray
+            )
+        }
+    }
+}

app/src/main/java/com/example/helios_location_finder/NtfyReceiver.kt

@@ -0,0 +1,42 @@
+package com.example.helios_location_finder
+
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import android.util.Log
+import androidx.work.ExistingWorkPolicy
+import androidx.work.OneTimeWorkRequestBuilder
+import androidx.work.WorkManager
+
+class NtfyReceiver : BroadcastReceiver() {
+
+    companion object {
+        private const val TAG = "NtfyReceiver"
+    }
+
+    override fun onReceive(context: Context, intent: Intent) {
+        val message = intent.getStringExtra("message") ?: return
+        val topic = intent.getStringExtra("topic") ?: ""
+
+        Log.d(TAG, "Received ntfy message on topic '$topic': $message")
+
+        val listenTopic = Prefs.getListenTopic(context)
+        if (listenTopic.isBlank()) {
+            Log.w(TAG, "No listen topic configured, ignoring")
+            return
+        }
+
+        if (topic != listenTopic) {
+            Log.d(TAG, "Topic '$topic' does not match configured '$listenTopic', ignoring")
+            return
+        }
+
+        if (message.trim().equals("LOCATE", ignoreCase = true)) {
+            Log.d(TAG, "LOCATE command received, enqueuing LocationWorker")
+            val workRequest = OneTimeWorkRequestBuilder<LocationWorker>().build()
+            WorkManager.getInstance(context).enqueueUniqueWork(
+                "locate", ExistingWorkPolicy.REPLACE, workRequest
+            )
+        }
+    }
+}

app/src/main/java/com/example/helios_location_finder/Prefs.kt

@@ -0,0 +1,24 @@
+package com.example.helios_location_finder
+
+import android.content.Context
+
+object Prefs {
+    private const val NAME = "helios_prefs"
+    const val KEY_LISTEN_TOPIC = "listen_topic"
+    const val KEY_REPLY_TOPIC = "reply_topic"
+
+    private fun prefs(context: Context) =
+        context.getSharedPreferences(NAME, Context.MODE_PRIVATE)
+
+    fun getListenTopic(context: Context): String =
+        prefs(context).getString(KEY_LISTEN_TOPIC, "") ?: ""
+
+    fun getReplyTopic(context: Context): String =
+        prefs(context).getString(KEY_REPLY_TOPIC, "") ?: ""
+
+    fun setListenTopic(context: Context, topic: String) =
+        prefs(context).edit().putString(KEY_LISTEN_TOPIC, topic).apply()
+
+    fun setReplyTopic(context: Context, topic: String) =
+        prefs(context).edit().putString(KEY_REPLY_TOPIC, topic).apply()
+}

app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/black" />
+    <foreground android:drawable="@mipmap/ic_launcher_foreground" />
+</adaptive-icon>

app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/black" />
+    <foreground android:drawable="@mipmap/ic_launcher_foreground" />
+</adaptive-icon>

app/src/main/res/values-night/themes.xml

@@ -0,0 +1,9 @@
+<resources>
+    <style name="Theme.Helioslocationfinder" parent="android:Theme.Material.NoActionBar">
+        <item name="android:colorPrimary">@color/orange</item>
+        <item name="android:colorAccent">@color/orange_light</item>
+        <item name="android:windowBackground">@color/black</item>
+        <item name="android:statusBarColor">@color/black</item>
+        <item name="android:navigationBarColor">@color/black</item>
+    </style>
+</resources>

app/src/main/res/values/colors.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="orange">#FFFF6D00</color>
+    <color name="orange_light">#FFFFAB40</color>
+    <color name="orange_dark">#FFCC5500</color>
+    <color name="black">#FF000000</color>
+    <color name="dark_surface">#FF1A1A1A</color>
+    <color name="white">#FFFFFFFF</color>
+    <color name="gray_light">#FFB0B0B0</color>
+</resources>

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

@@ -0,0 +1,3 @@
+<resources>
+    <string name="app_name">Helios Tracker</string>
+</resources>

app/src/main/res/values/themes.xml

@@ -0,0 +1,9 @@
+<resources>
+    <style name="Theme.Helioslocationfinder" parent="android:Theme.Material.NoActionBar">
+        <item name="android:colorPrimary">@color/orange</item>
+        <item name="android:colorAccent">@color/orange_light</item>
+        <item name="android:windowBackground">@color/black</item>
+        <item name="android:statusBarColor">@color/black</item>
+        <item name="android:navigationBarColor">@color/black</item>
+    </style>
+</resources>

app/src/main/res/xml/backup_rules.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+   Sample backup rules file; uncomment and customize as necessary.
+   See https://developer.android.com/guide/topics/data/autobackup
+   for details.
+   Note: This file is ignored for devices older than API 31
+   See https://developer.android.com/about/versions/12/backup-restore
+-->
+<full-backup-content>
+    <!--
+   <include domain="sharedpref" path="."/>
+   <exclude domain="sharedpref" path="device.xml"/>
+-->
+</full-backup-content>

app/src/main/res/xml/data_extraction_rules.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+   Sample data extraction rules file; uncomment and customize as necessary.
+   See https://developer.android.com/about/versions/12/backup-restore#xml-changes
+   for details.
+-->
+<data-extraction-rules>
+    <cloud-backup>
+        <!-- TODO: Use <include> and <exclude> to control what is backed up.
+        <include .../>
+        <exclude .../>
+        -->
+    </cloud-backup>
+    <!--
+    <device-transfer>
+        <include .../>
+        <exclude .../>
+    </device-transfer>
+    -->
+</data-extraction-rules>

app/src/test/java/com/example/helios_location_finder/ExampleUnitTest.kt

@@ -0,0 +1,17 @@
+package com.example.helios_location_finder
+
+import org.junit.Test
+
+import org.junit.Assert.*
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+class ExampleUnitTest {
+    @Test
+    fun addition_isCorrect() {
+        assertEquals(4, 2 + 2)
+    }
+}