map improvements and GTFS vehicle tracking bases

.idea/deploymentTargetSelector.xml

@@ -4,7 +4,7 @@
     <selectionStates>
       <SelectionState runConfigName="app">
         <option name="selectionMode" value="DROPDOWN" />
-        <DropdownSelection timestamp="2026-09-01T18:25:26.823607018Z">
+        <DropdownSelection timestamp="2026-09-02T15:28:00.985067432Z">
           <Target type="DEFAULT_BOOT">
             <handle>
               <DeviceId pluginId="LocalEmulator" identifier="path=/home/lukas/.config/.android/avd/Medium_Phone_OSS.avd" />

app/build.gradle.kts

@@ -59,4 +59,5 @@ dependencies {
     androidTestImplementation(libs.androidx.compose.ui.test.junit4)
     debugImplementation(libs.androidx.compose.ui.tooling)
     debugImplementation(libs.androidx.compose.ui.test.manifest)
+    implementation(libs.gtfs.realtime.bindings)
 }

app/src/main/java/org/pupes/mhdrunpathfinder/GTFSUtils.kt

@@ -4,18 +4,11 @@ import android.app.Activity
 import android.os.Handler
 import android.os.Looper
 import android.widget.Toast
-import androidx.compose.foundation.layout.size
-import androidx.compose.material3.Icon
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.res.painterResource
-import androidx.compose.ui.unit.dp
+import com.google.transit.realtime.GtfsRealtime
 import kotlinx.serialization.Serializable
 import okhttp3.OkHttpClient
 import okhttp3.Request
-import ovh.plrapps.mapcompose.api.addMarker
 import ovh.plrapps.mapcompose.api.removeMarker
-import ovh.plrapps.mapcompose.ui.state.markers.model.RenderingStrategy
 import java.net.URL
 
 @Serializable
@@ -82,32 +75,36 @@ private val GTFSMainHandler = Handler(Looper.getMainLooper())
 private var GTFSTrackingThread: Thread? = null
 private var GTFSIsTracking = false
 
-private fun fetchGTFSPosition(gtfsUrl: URL,api_key: String, callee: Activity) {
+private fun fetchGTFSPositions(gtfsUrl: URL, api_key: String, callee: Activity) {
     try {
-
         val request = Request.Builder()
-            .url("${gtfsUrl.protocol}://${gtfsUrl.host}${"/"}")
+            .url("${gtfsUrl.protocol}://${gtfsUrl.host}${callee.getString(R.string.combined_feed_path)}")
             .header("User-Agent", "${BuildConfig.APPLICATION_ID}/${BuildConfig.VERSION_NAME} (Android)")
+            .header("X-Access-Token", api_key)
             .build()
 
         gtfshttpClient.newCall(request).execute().use { response ->
-            var message = if (response.isSuccessful) {
-                response.body?.string() ?: "Empty response"
-            } else {
-                "Error: ${response.code} ${response.message}"
+            if (!response.isSuccessful) {
+                throw Exception("Error: ${response.code} ${response.message}")
             }
 
-            // TODO: Handle response
+            val bytes = response.body?.bytes() ?: throw Exception("Empty response")
+            val feed = GtfsRealtime.FeedMessage.parseFrom(bytes)
+
+            feed.entityList.forEach { entity ->
+                if (entity.hasVehicle()) {
+
+                    // use vehicle
+                }
+            }
         }
     } catch (e: Exception) {
-        // Post UI update to main thread
         GTFSMainHandler.post {
             Toast.makeText(callee, e.message ?: "Unknown error", Toast.LENGTH_SHORT).show()
         }
     }
 }
 
-
 // Start the timer with a URL:
 fun startGTFSTracking(url: String, api_key: String, callee: Activity) {
     if (GTFSIsTracking) return
@@ -197,7 +194,7 @@ fun startGTFSTracking(url: String, api_key: String, callee: Activity) {
             return@Thread
         }
         while (GTFSIsTracking) {
-            fetchGTFSPosition(gtfsUrl,api_key, callee)
+            fetchGTFSPositions(gtfsUrl,api_key, callee)
             try {
                 Thread.sleep(1000) // Wait 1 second between requests
             } catch (e: InterruptedException) {

app/src/main/java/org/pupes/mhdrunpathfinder/HaukUtils.kt

@@ -4,10 +4,15 @@ import android.app.Activity
 import android.os.Handler
 import android.os.Looper
 import android.widget.Toast
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.unit.dp
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.json.Json
 import okhttp3.OkHttpClient
+import ovh.plrapps.mapcompose.api.addPath
 import ovh.plrapps.mapcompose.api.moveMarker
+import ovh.plrapps.mapcompose.api.removePath
+import ovh.plrapps.mapcompose.api.updatePath
 import java.net.URL
 
 @Serializable
@@ -28,8 +33,9 @@ val haukhttpClient = OkHttpClient.Builder()
 
 private val HaukMainHandler = Handler(Looper.getMainLooper())
 private var HaukTrackingThread: Thread? = null
-private var HaukIsTracking = false
+var HaukIsTracking = false
 
+private var PathCreated = false
 private fun fetchHaukPosition(haukUrl: String, callee: Activity) {
     try {
         val url = URL(haukUrl)
@@ -76,6 +82,18 @@ private fun fetchHaukPosition(haukUrl: String, callee: Activity) {
                     } catch (e: Exception) {
                         // Marker might not exist yet, ignore
                     }
+
+                    pathDataBuilder.addPoint(longitudeToXNormalized(lon), latitudeToYNormalized(lat));
+                    if (!PathCreated) {
+                        mapState.addPath(
+                            "target_path", color = Color(0xFF0000FF),
+                            pathData = pathDataBuilder.build()?: return@post,
+                            width = 1.dp
+                        );
+                        PathCreated = true
+                    }
+                    mapState.updatePath("target_path", pathData = pathDataBuilder.build())
+
                 }
             } else {
                 HaukMainHandler.post {
@@ -95,6 +113,10 @@ fun startHaukTracking(url: String, callee: Activity) {
     if (HaukIsTracking) return
 
     HaukIsTracking = true
+
+
+
+
     HaukTrackingThread = Thread {
         while (HaukIsTracking) {
             fetchHaukPosition(url, callee)
@@ -111,4 +133,6 @@ fun stopHaukTracking() {
     HaukIsTracking = false
     HaukTrackingThread?.interrupt()
     HaukTrackingThread = null
+    mapState.removePath("target_path");
+    PathCreated = false;
 }

app/src/main/java/org/pupes/mhdrunpathfinder/MainActivity.kt

@@ -31,7 +31,6 @@ import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
-import androidx.compose.ui.Alignment
 import kotlinx.coroutines.launch
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
@@ -52,9 +51,18 @@ import java.io.FileInputStream
 import java.io.FileOutputStream
 import java.net.URL
 import android.os.StrictMode
+import android.widget.Toast
 import androidx.compose.ui.geometry.Offset
 import androidx.compose.ui.unit.sp
 import ovh.plrapps.mapcompose.api.getMarkerInfo
+import android.util.Log
+import androidx.compose.foundation.layout.navigationBarsPadding
+import androidx.compose.material3.DropdownMenu
+import androidx.compose.material3.DropdownMenuItem
+import androidx.compose.ui.Alignment
+import ovh.plrapps.mapcompose.api.addPath
+import ovh.plrapps.mapcompose.api.makePathDataBuilder
+import java.security.MessageDigest
 
 
 // MapState configuration for OpenStreetMap
@@ -67,15 +75,42 @@ val mapState = MapState(
     fullHeight = 67108864,
     tileSize = 256
 )
+val pathDataBuilder = mapState.makePathDataBuilder();
+
+
 var target_speed by mutableStateOf("0.0km/h");
 
 /**
- * Creates a cached tile stream provider for OpenStreetMap tiles
- * Tiles are cached in the app's cache directory for offline access and faster loading
- * Cache expires after 30 days to ensure map updates are fetched
+ * Derives a stable, filesystem-safe cache namespace for a tile provider from its URL.
+ * Query parameters are ignored: same path with a different apikey/lang/etc. maps to
+ * the same namespace. A different path (e.g. "outdoor" vs "basic") maps to a different one.
  */
-fun createCachedTileStreamProvider(context: Context, cacheExpiryDays: Int = 30): TileStreamProvider {
-    val cacheDir = File(context.cacheDir, "map_tiles")
+fun providerCacheNamespace(urlNoQuery: String): String {
+    val digest = MessageDigest.getInstance("SHA-256")
+        .digest(urlNoQuery.toByteArray(Charsets.UTF_8))
+    return digest.joinToString("") { "%02x".format(it) }.take(16)
+}
+
+/**
+ * Creates a cached tile stream provider for a given map tile URL template.
+ * Tiles are cached in the app's cache directory, namespaced per provider so different
+ * providers/layers never collide even if they share col/row/zoomLvl coordinates.
+ * Cache expires after 30 days to ensure map updates are fetched.
+ *
+ * @param urlBuilder builds the request URL for a given (row, col, zoomLvl). Everything
+ *   after '?' (GET parameters) is ignored for cache namespacing purposes.
+ */
+fun createCachedTileStreamProvider(
+    context: Context,
+    cacheExpiryDays: Int = 30,
+    urlBuilder: (row: Int, col: Int, zoomLvl: Int) -> String
+): TileStreamProvider {
+    // Namespace derived from the URL path (query params stripped), sampled once,
+    // so tiles from different providers/layers land in separate cache directories.
+    val sampleUrlNoQuery = urlBuilder(0, 0, 0).substringBefore('?')
+    val namespace = providerCacheNamespace(sampleUrlNoQuery)
+
+    val cacheDir = File(File(context.cacheDir, "map_tiles"), namespace)
     if (!cacheDir.exists()) {
         cacheDir.mkdirs()
     }
@@ -95,7 +130,7 @@ fun createCachedTileStreamProvider(context: Context, cacheExpiryDays: Int = 30):
 
             // Since mapcompose runs this on a background thread, we can do networking here.
             try {
-                val url = URL("https://tile.openstreetmap.org/$zoomLvl/$col/$row.png")
+                val url = URL(urlBuilder(row, col, zoomLvl))
                 val connection = url.openConnection()
                 // Set User-Agent header as required by OSM tile usage policy
                 val userAgent = "${BuildConfig.APPLICATION_ID}/${BuildConfig.VERSION_NAME} (Android) (Contact: poliecho@pupes.org)"
@@ -115,7 +150,9 @@ fun createCachedTileStreamProvider(context: Context, cacheExpiryDays: Int = 30):
                 if (tileFile.exists()) {
                     FileInputStream(tileFile)
                 } else {
+                    Log.e("TileStreamProvider", "Failed to download tile: ${e.message} from: ")
                     null
+
                 }
             }
         } catch (e: Exception) {
@@ -177,6 +214,8 @@ fun MainScreen(callee: Activity) {
     var haukState by remember { mutableStateOf(false) }
     var golemioState by remember { mutableStateOf(golemioAPIkey.isNotEmpty())}
 
+    var showMapProviderDialog by remember { mutableStateOf(false) }
+
     LaunchedEffect(Unit) {
         if (golemioState) {
             startGTFSTracking(callee.getString(R.string.golemio_base_url), golemioAPIkey, callee)
@@ -193,19 +232,19 @@ fun MainScreen(callee: Activity) {
             IconID = R.drawable.baseline_settings_24
         )
         Column(modifier = Modifier.align(Alignment.TopStart)) {
-        IconButton( // look at target button
-            onClick = {
-                coroutineScope.launch {
-                    mapState.getMarkerInfo("target_position")?.let { marker ->
-                        mapState.scrollTo(marker.x, marker.y, destScale = 0.1)
+            IconButton( // look at target button
+                onClick = {
+                    coroutineScope.launch {
+                        mapState.getMarkerInfo("target_position")?.let { marker ->
+                            mapState.scrollTo(marker.x, marker.y, destScale = 0.1)
+                        }
                     }
-                }
-            },
-            modifier = Modifier
-                .padding(start = 5.dp, bottom = 5.dp),
-            IconID = R.drawable.target
-        )
-        IconButton( // look at my location button
+                },
+                modifier = Modifier
+                    .padding(start = 5.dp, bottom = 5.dp),
+                IconID = R.drawable.target
+            )
+            IconButton( // look at my location button
                 onClick = {
                     coroutineScope.launch {
                         mapState.getMarkerInfo("current_position")?.let { marker ->
@@ -219,6 +258,44 @@ fun MainScreen(callee: Activity) {
             )
         }
 
+        Box(modifier = Modifier.align(Alignment.BottomEnd).navigationBarsPadding()) {
+            IconButton( // change map provider
+                onClick = { showMapProviderDialog = true },
+                modifier = Modifier
+                    .padding(end = 5.dp, bottom = 5.dp),
+                IconID = R.drawable.outline_layers_24
+            )
+            DropdownMenu(
+                expanded = showMapProviderDialog,
+                onDismissRequest = { showMapProviderDialog = false }
+            ) {
+                DropdownMenuItem(
+                    text = { Text("Map provider 1") },
+                    onClick = { /* Do something... */ },
+                    leadingIcon = {
+                        Icon(
+                            painter = painterResource(id = R.drawable.ic_launcher_foreground),
+                            contentDescription = null,
+                            modifier = Modifier.size(24.dp),
+                            tint = Color(0xFF000000)
+                        )
+                    },
+                )
+                DropdownMenuItem(
+                    text = { Text("Add new provider") },
+                    leadingIcon = {
+                        Icon(
+                            painter = painterResource(id = R.drawable.outline_add_24),
+                            contentDescription = null,
+                            modifier = Modifier.size(24.dp),
+                            tint = Color(0xFF000000)
+                        )
+                    },
+                    onClick = { /* Do something... */ }
+                )
+            }
+        }
+
         if (showSettings) {
             ShowSettingsMenu(
                 onDismiss = { showSettings = false },
@@ -339,10 +416,10 @@ fun ShowSettingsMenu(
                         .width(250.dp));
                 ElevatedButton(onClick = onGolemioApply, modifier = Modifier.padding(start = 5.dp), shape = RectangleShape) {
                     Text("Apply")
+                }
             }
         }
-    }
-}}
+    }}
 
 @Preview
 @Composable
@@ -350,7 +427,9 @@ fun OpenStreetMapScreen(context: Context? = null) {
     // Create tile stream provider for OpenStreetMap with caching
     val tileStreamProvider = remember(context) {
         context?.let {
-            createCachedTileStreamProvider(it)
+            createCachedTileStreamProvider(it) { row, col, zoomLvl ->
+                "https://api.mapy.com/v1/maptiles/outdoor/256/$zoomLvl/$col/$row?lang=cs&apikey=jv6a1-RP0jvLuMAL8jUUVw5Jaw1gAVC2jttMzdsOqyw"
+            }
         } ?: TileStreamProvider { row, col, zoomLvl ->
             // Fallback for preview mode without context
             try {

app/src/main/res/drawable/outline_add_24.xml

@@ -0,0 +1,20 @@
+<!--
+  ~ Copyright (C) 2026 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:height="24dp" android:tint="#000000" android:viewportHeight="960" android:viewportWidth="960" android:width="24dp">
+      
+    <path android:fillColor="@android:color/white" android:pathData="M440,520L200,520L200,440L440,440L440,200L520,200L520,440L760,440L760,520L520,520L520,760L440,760L440,520Z"/>
+    
+</vector>

app/src/main/res/drawable/outline_layers_24.xml

@@ -0,0 +1,20 @@
+<!--
+  ~ Copyright (C) 2026 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:height="24dp" android:tint="#000000" android:viewportHeight="960" android:viewportWidth="960" android:width="24dp">
+      
+    <path android:fillColor="@android:color/white" android:pathData="M480,842L120,562L186,512L480,740L774,512L840,562L480,842ZM480,640L120,360L480,80L840,360L480,640ZM480,360L480,360L480,360L480,360ZM480,538L710,360L480,182L250,360L480,538Z"/>
+    
+</vector>

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

@@ -2,6 +2,7 @@
     <string name="app_name">MHD run Pathfinder</string>
     <string name="routes_path">/v2/gtfs/routes</string>
     <string name="stops_path">/v2/gtfs/stops</string>
+    <string name="combined_feed_path">/v2/vehiclepositions/gtfsrt/pid_feed.pb</string>"
     <string name="golemio_base_url">https://api.golemio.cz</string>
     <string name="golemio_realtime_path"></string>
 </resources>

gradle/libs.versions.toml

@@ -1,6 +1,7 @@
 [versions]
 agp = "9.0.0"
 coreKtx = "1.10.1"
+gtfsRealtimeBindings = "0.2.0"
 junit = "4.13.2"
 junitVersion = "1.1.5"
 espressoCore = "3.5.1"
@@ -14,6 +15,7 @@ appcompat = "1.7.1"
 
 [libraries]
 androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
+gtfs-realtime-bindings = { module = "org.mobilitydata:gtfs-realtime-bindings", version.ref = "gtfsRealtimeBindings" }
 junit = { group = "junit", name = "junit", version.ref = "junit" }
 androidx-junit = { group = "androidx.test.ext", name = "junit", version.ref = "junitVersion" }
 androidx-espresso-core = { group = "androidx.test.espresso", name = "espresso-core", version.ref = "espressoCore" }