From e7f0ef03ad92979e663f782ceb447194d474bcca Mon Sep 17 00:00:00 2001
From: si2503 <siegfried.klaus@student.jade-hs.de>
Date: Sat, 20 Dec 2025 11:22:12 +0100
Subject: [PATCH] =?UTF-8?q?-=20Standortbestimmungfunktionalit=C3=A4t=20hin?=
 =?UTF-8?q?zugef=C3=BCgt?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 app/src/main/AndroidManifest.xml              |   3 +
 .../com/example/snapandsolve/MainScreen.kt    |   7 +-
 .../snapandsolve/ui/theme/locationHelper.kt   | 109 ++++++++++++++++++
 3 files changed, 118 insertions(+), 1 deletion(-)
 create mode 100644 app/src/main/java/com/example/snapandsolve/ui/theme/locationHelper.kt

diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index c091ed7..1e9787f 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -6,6 +6,9 @@
     <uses-feature android:name="android.hardware.camera" android:required="false" />
     <!-- ArcGIS Pro benötigt-->
     <uses-permission android:name="android.permission.INTERNET" />
+    <!-- Für Standortbestimmung -->
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
+    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
 
     <application
         android:allowBackup="true"
diff --git a/app/src/main/java/com/example/snapandsolve/MainScreen.kt b/app/src/main/java/com/example/snapandsolve/MainScreen.kt
index ab56026..d999c9e 100644
--- a/app/src/main/java/com/example/snapandsolve/MainScreen.kt
+++ b/app/src/main/java/com/example/snapandsolve/MainScreen.kt
@@ -67,6 +67,7 @@ import com.example.snapandsolve.camera.Intent
 import com.example.snapandsolve.ui.theme.AppColor
 import com.example.snapandsolve.ui.theme.ButtonColor
 import com.example.snapandsolve.ui.theme.WidgetColor
+import com.example.snapandsolve.ui.theme.setupLocationDisplay
 import kotlinx.coroutines.Dispatchers
 
 
@@ -141,11 +142,15 @@ fun ContentScreen(
         createMap() //Funktion zur Erstellung der Map
     }
 
+    //Standortbestimmung aus locationHelper.kt
+    val locationDisplay = setupLocationDisplay()
+
     Box(modifier = modifier.fillMaxSize()) {
         // HINTERGRUND: Die Map
         MapView(
             modifier = Modifier.fillMaxSize(),
-            arcGISMap = map
+            arcGISMap = map,
+            locationDisplay = locationDisplay
         )
 
         // VORDERGRUND: Das Overlay (wenn showReport = true)
diff --git a/app/src/main/java/com/example/snapandsolve/ui/theme/locationHelper.kt b/app/src/main/java/com/example/snapandsolve/ui/theme/locationHelper.kt
new file mode 100644
index 0000000..e903832
--- /dev/null
+++ b/app/src/main/java/com/example/snapandsolve/ui/theme/locationHelper.kt
@@ -0,0 +1,109 @@
+package com.example.snapandsolve.ui.theme
+
+
+
+import android.Manifest
+import android.content.Context
+import android.content.pm.PackageManager
+import android.widget.Toast
+import androidx.activity.compose.rememberLauncherForActivityResult
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.core.content.ContextCompat
+import com.arcgismaps.location.LocationDisplayAutoPanMode
+import com.arcgismaps.mapping.view.LocationDisplay
+import com.arcgismaps.toolkit.geoviewcompose.rememberLocationDisplay
+import kotlinx.coroutines.launch
+
+/**
+ * Helper-Klasse für Standort-Funktionalität
+ */
+class LocationHelper(private val context: Context) {
+
+    /**
+     * Prüft, ob Standort-Berechtigungen erteilt wurden
+     */
+    fun hasLocationPermissions(): Boolean {
+        val coarseLocation = ContextCompat.checkSelfPermission(
+            context,
+            Manifest.permission.ACCESS_COARSE_LOCATION
+        ) == PackageManager.PERMISSION_GRANTED
+
+        val fineLocation = ContextCompat.checkSelfPermission(
+            context,
+            Manifest.permission.ACCESS_FINE_LOCATION
+        ) == PackageManager.PERMISSION_GRANTED
+
+        return coarseLocation && fineLocation
+    }
+}
+
+/**
+ * Composable zum Einrichten des Location Display
+ *
+ * @param autoPanMode Wie die Karte dem Standort folgen soll (default: Recenter)
+ * @return LocationDisplay-Objekt, das an MapView übergeben werden kann
+ */
+@Composable
+fun setupLocationDisplay(
+    autoPanMode: LocationDisplayAutoPanMode = LocationDisplayAutoPanMode.Recenter
+): LocationDisplay {
+    val context = androidx.compose.ui.platform.LocalContext.current
+    val coroutineScope = rememberCoroutineScope()
+    val locationHelper = LocationHelper(context)
+
+    val locationDisplay = rememberLocationDisplay().apply {
+        setAutoPanMode(autoPanMode)
+    }
+
+    if (locationHelper.hasLocationPermissions()) {
+        LaunchedEffect(Unit) {
+            locationDisplay.dataSource.start()
+        }
+    } else {
+        RequestLocationPermissions(
+            context = context,
+            onPermissionsGranted = {
+                coroutineScope.launch {
+                    locationDisplay.dataSource.start()
+                }
+            }
+        )
+    }
+
+    return locationDisplay
+}
+
+/**
+ * Composable zum Anfordern von Standort-Berechtigungen
+ */
+@Composable
+private fun RequestLocationPermissions(
+    context: Context,
+    onPermissionsGranted: () -> Unit
+) {
+    val activityResultLauncher = rememberLauncherForActivityResult(
+        ActivityResultContracts.RequestMultiplePermissions()
+    ) { permissions ->
+        if (permissions.all { it.value }) {
+            onPermissionsGranted()
+        } else {
+            Toast.makeText(
+                context,
+                "Standort-Berechtigung wurde verweigert",
+                Toast.LENGTH_LONG
+            ).show()
+        }
+    }
+
+    LaunchedEffect(Unit) {
+        activityResultLauncher.launch(
+            arrayOf(
+                Manifest.permission.ACCESS_COARSE_LOCATION,
+                Manifest.permission.ACCESS_FINE_LOCATION
+            )
+        )
+    }
+}
\ No newline at end of file