Json laden

app/build.gradle.kts

@@ -2,6 +2,7 @@ plugins {
     alias(libs.plugins.android.application)
     alias(libs.plugins.kotlin.android)
     alias(libs.plugins.kotlin.compose)
+    alias(libs.plugins.kotlin.serialization)
 }
 
 android {
@@ -68,7 +69,7 @@ dependencies {
     debugImplementation(libs.androidx.compose.ui.test.manifest)
     implementation("androidx.compose.material:material-icons-extended:1.7.8")
     implementation("com.google.android.gms:play-services-location:21.3.0")
-
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.6.0")
     // ArcGIS Maps for Kotlin - SDK dependency
     implementation(libs.arcgis.maps.kotlin)
     // Toolkit dependencies

app/src/main/java/de/jadehs/strassenschadenpro2/ListViewModel.kt

@@ -0,0 +1,105 @@
+package de.jadehs.strassenschadenpro2
+
+import android.app.Application
+import androidx.lifecycle.AndroidViewModel
+import androidx.lifecycle.viewModelScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.json.Json
+import java.net.HttpURLConnection
+import java.net.URL
+
+class ListViewModel(application: Application): AndroidViewModel(application) {
+
+    private val _features = MutableStateFlow<List<Feature>>(emptyList())
+    val features: StateFlow<List<Feature>> = _features
+
+    fun fetch() {
+        viewModelScope.launch {
+            try {
+                val data =
+                    loadFeatures("https://services9.arcgis.com/UVxdrlZq3S3gqt7w/ArcGIS/rest/services/StrassenSchaeden/FeatureServer/0/query?where=1%3D1&objectIds=&geometry=&geometryType=esriGeometryEnvelope&inSR=&spatialRel=esriSpatialRelIntersects&resultType=none&distance=0.0&units=esriSRUnit_Meter&outDistance=&relationParam=&returnGeodetic=false&outFields=OBJECTID%2Ctyp%2Cbeschreibung&returnGeometry=true&featureEncoding=esriDefault&multipatchOption=xyFootprint&maxAllowableOffset=&geometryPrecision=&outSR=&defaultSR=&datumTransformation=&applyVCSProjection=false&returnIdsOnly=false&returnUniqueIdsOnly=false&returnCountOnly=false&returnExtentOnly=false&returnQueryGeometry=false&returnDistinctValues=false&cacheHint=false&collation=&orderByFields=&groupByFieldsForStatistics=&returnAggIds=false&outStatistics=&having=&resultOffset=&resultRecordCount=&returnZ=false&returnM=false&returnTrueCurves=false&returnExceededLimitFeatures=true&quantizationParameters=&sqlFormat=none&f=pgeojson&token=")
+                _features.value = data.features
+            } catch (e: Exception){
+                e.printStackTrace()
+            }
+        }
+
+    }
+
+    suspend fun loadFeatures(url: String): FeatureCollection {
+        val jsonParser = Json { ignoreUnknownKeys = true }
+        val jsonText = loadJsonFromUrl(url)
+        return jsonParser.decodeFromString(jsonText)
+    }
+
+    suspend fun loadJsonFromUrl(urlString: String): String{
+        return withContext(Dispatchers.IO){
+            val url = URL(urlString)
+            val conn = url.openConnection() as HttpURLConnection
+            conn.requestMethod = "GET"
+            conn.connectTimeout = 5000
+            conn.readTimeout = 5000
+
+            try {
+                val stream = conn.inputStream
+                stream.bufferedReader().use { it.readText() }
+            } finally {
+                conn.disconnect()
+            }
+        }
+    }
+}
+
+@Serializable
+data class FeatureCollection(
+    val type: String? = null,
+    val features: List<Feature> = emptyList()
+)
+
+@Serializable
+data class Feature(
+    val type: String? = null,
+    val id: Int? = null,
+    val geometry: Geometry? = null,
+    val properties: Properties? = null
+)
+
+@Serializable
+data class Geometry(
+    val type: String? = null,
+    val coordinates: List<Double> = emptyList()
+)
+
+@Serializable
+data class Properties(
+    val OBJECTID: Int? = null,
+    val Typ: String? = null,
+    val Beschreibung: String? = null
+)
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+

app/src/main/java/de/jadehs/strassenschadenpro2/MainScreen.kt

@@ -59,10 +59,11 @@ fun MainScreen(modifier: Modifier = Modifier, application: Application) {
 @Composable
 fun ContentScreen(modifier: Modifier = Modifier, selectedIndex: Int, application: Application) {
     val mapViewModel = remember { MapViewModel(application) }
+    val listViewModel = remember { ListViewModel(application) }
     when(selectedIndex) {
         0 -> MapPage(modifier = modifier, mapViewModel = mapViewModel)
         1 -> CreatePage(modifier = modifier, mapViewModel = mapViewModel)
-        2 -> ListPage()
+        2 -> ListPage(modifier = modifier, listViewModel = listViewModel)
         3 -> SettingsPage()
     }
 }

app/src/main/java/de/jadehs/strassenschadenpro2/pages/CreatePage.kt

@@ -131,7 +131,11 @@ fun CreatePage(modifier: Modifier = Modifier, mapViewModel: MapViewModel) {
                                 location.latitude,
                                 SpatialReference.wgs84())
                             val photoDataList = getPhotosFromAlbum(context,albumViewModel)
-                            mapViewModel.createFeatureWithAttributesAtPoint(point,beschreibung,typ,photoDataList)
+                            mapViewModel.createFeatureWithAttributesAtPoint(
+                                point,
+                                beschreibung,
+                                typ,
+                                photoDataList)
                         }
                     }
                 }){

app/src/main/java/de/jadehs/strassenschadenpro2/pages/ListPage.kt

@@ -1,10 +1,20 @@
 package de.jadehs.strassenschadenpro2.pages
 
+import android.util.Log
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
 import androidx.compose.ui.Modifier
+import de.jadehs.strassenschadenpro2.ListViewModel
 
 @Composable
-fun ListPage(modifier: Modifier = Modifier) {
+fun ListPage(modifier: Modifier = Modifier, listViewModel: ListViewModel) {
+    val features = listViewModel.features.collectAsState()
+    LaunchedEffect(Unit) {
+        listViewModel.fetch()
+        Log.d("test",""+features.value.size)
+    }
+
     Text("Liste")
 }

gradle/libs.versions.toml

@@ -35,4 +35,5 @@ arcgis-maps-kotlin-toolkit-authentication = { group = "com.esri", name = "arcgis
 android-application = { id = "com.android.application", version.ref = "agp" }
 kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
 kotlin-compose = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin" }
+kotlin-serialization = { id="org.jetbrains.kotlin.plugin.serialization", version.ref = "kotlin"}