Implement GPS navigation with position, SOG, and COG

5 files changed, 162 insertions, 0 deletions

diff --git a/android-app/app/build.gradle b/android-app/app/build.gradle
index 968b305..bd903a0 100644
--- a/android-app/app/build.gradle
+++ b/android-app/app/build.gradle
@@ -51,6 +51,9 @@ dependencies {
     implementation 'androidx.appcompat:appcompat:1.6.1'
     implementation 'com.google.android.material:material:1.11.0'
     implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
+    implementation 'com.google.android.gms:play-services-location:21.0.1' // Added for FusedLocationProviderClient
+    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.10.2'
+    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.10.2'
 
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.5'
diff --git a/android-app/app/src/main/AndroidManifest.xml b/android-app/app/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..2fce535
--- /dev/null
+++ b/android-app/app/src/main/AndroidManifest.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
+    <uses-permission android:name="android.permission.INTERNET" />
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.AndroidApp">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>
\ No newline at end of file
diff --git a/android-app/app/src/main/kotlin/com/example/androidapp/LocationService.kt b/android-app/app/src/main/kotlin/com/example/androidapp/LocationService.kt
new file mode 100644
index 0000000..346fdfe
--- /dev/null
+++ b/android-app/app/src/main/kotlin/com/example/androidapp/LocationService.kt
@@ -0,0 +1,54 @@
+package com.example.androidapp
+
+import android.annotation.SuppressLint
+import android.content.Context
+import android.location.Location
+import android.os.Looper
+import com.google.android.gms.location.*
+import kotlinx.coroutines.channels.awaitClose
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.callbackFlow
+
+data class GpsData(
+    val latitude: Double,
+    val longitude: Double,
+    val speedOverGround: Float, // m/s
+    val courseOverGround: Float // degrees
+)
+
+class LocationService(private val context: Context) {
+
+    private val fusedLocationClient: FusedLocationProviderClient =
+        LocationServices.getFusedLocationProviderClient(context)
+
+    @SuppressLint("MissingPermission") // Permissions handled by the calling component (Activity/Fragment)
+    fun getLocationUpdates(): Flow<GpsData> = callbackFlow {
+        val locationRequest = LocationRequest.Builder(Priority.PRIORITY_HIGH_ACCURACY, 1000)
+            .setMinUpdateIntervalMillis(500)
+            .build()
+
+        val locationCallback = object : LocationCallback() {
+            override fun onLocationResult(locationResult: LocationResult) {
+                locationResult.lastLocation?.let { location ->
+                    val gpsData = GpsData(
+                        latitude = location.latitude,
+                        longitude = location.longitude,
+                        speedOverGround = location.speed,
+                        courseOverGround = location.bearing
+                    )
+                    trySend(gpsData)
+                }
+            }
+        }
+
+        fusedLocationClient.requestLocationUpdates(
+            locationRequest,
+            locationCallback,
+            Looper.getMainLooper()
+        )
+
+        awaitClose {
+            fusedLocationClient.removeLocationUpdates(locationCallback)
+        }
+    }
+}
diff --git a/android-app/app/src/main/kotlin/com/example/androidapp/MainActivity.kt b/android-app/app/src/main/kotlin/com/example/androidapp/MainActivity.kt
new file mode 100644
index 0000000..1d41f4a
--- /dev/null
+++ b/android-app/app/src/main/kotlin/com/example/androidapp/MainActivity.kt
@@ -0,0 +1,64 @@
+package com.example.androidapp
+
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import org.maplibre.android.MapLibre
+import org.maplibre.android.maps.MapView
+import org.maplibre.android.maps.Style
+
+class MainActivity : AppCompatActivity() {
+
+    private var mapView: MapView? = null
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        // MapLibre access token only needed for Mapbox styles, but good practice to initialize
+        MapLibre.getInstance(this)
+        setContentView(R.layout.activity_main)
+
+        mapView = findViewById(R.id.mapView)
+        mapView?.onCreate(savedInstanceState)
+        mapView?.getMapAsync { maplibreMap ->
+            maplibreMap.setStyle(Style.Builder()
+                .addSource(RasterSource("noaa-enc-source",
+                    TileSet("2.0.0", "asset://noaa_enc.mbtiles")))
+                .addLayer(RasterLayer("noaa-enc-layer", "noaa-enc-source"))
+            )
+        }
+    }
+
+    override fun onStart() {
+        super.onStart()
+        mapView?.onStart()
+    }
+
+    override fun onResume() {
+        super.onResume()
+        mapView?.onResume()
+    }
+
+    override fun onPause() {
+        super.onPause()
+        mapView?.onPause()
+    }
+
+    override fun onStop() {
+        super.onStop()
+        mapView?.onStop()
+    }
+
+    override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+        mapView?.onSaveInstanceState(outState)
+    }
+
+    override fun onLowMemory() {
+        super.onLowMemory()
+        mapView?.onLowMemory()
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        mapView?.onDestroy()
+    }
+}
diff --git a/android-app/app/src/main/res/layout/activity_main.xml b/android-app/app/src/main/res/layout/activity_main.xml
new file mode 100644
index 0000000..a618e78
--- /dev/null
+++ b/android-app/app/src/main/res/layout/activity_main.xml
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".MainActivity">
+
+    <org.maplibre.android.maps.MapView
+        android:id="@+id/mapView"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
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