adapt android build

wien_talks/wien_talks_flutter/.gitignore

@@ -44,6 +44,7 @@ app.*.map.json
 /android/app/debug
 /android/app/profile
 /android/app/release
+android/key.properties
 
 
 .env

wien_talks/wien_talks_flutter/android/app/build.gradle.kts

@@ -1,29 +1,48 @@
+import java.util.Properties
+import java.io.FileInputStream
+
 plugins {
     id("com.android.application")
     id("kotlin-android")
-    // The Flutter Gradle Plugin must be applied after the Android and Kotlin Gradle plugins.
     id("dev.flutter.flutter-gradle-plugin")
 }
 
+
+dependencies {
+    implementation("com.google.android.play:core:1.10.3")
+}
+
+val keystoreProperties = Properties()
+val keystorePropertiesFile = rootProject.file("key.properties")
+if (keystorePropertiesFile.exists()) {
+    FileInputStream(keystorePropertiesFile).use { keystoreProperties.load(it) }
+}
+
 android {
     namespace = "com.wien_talks"
     compileSdk = flutter.compileSdkVersion
     ndkVersion = flutter.ndkVersion
 
     compileOptions {
-        sourceCompatibility = JavaVersion.VERSION_11
-        targetCompatibility = JavaVersion.VERSION_11
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
     }
+    kotlinOptions { jvmTarget = "17" }
 
-    kotlinOptions {
-        jvmTarget = JavaVersion.VERSION_11.toString()
+    signingConfigs {
+        if (keystorePropertiesFile.exists()) {
+            create("release") {
+                keyAlias = keystoreProperties["keyAlias"] as String
+                keyPassword = keystoreProperties["keyPassword"] as String
+                val storePath = keystoreProperties["storeFile"] as String?
+                storeFile = storePath?.let { file(it) }
+                storePassword = keystoreProperties["storePassword"] as String
+            }
+        }
     }
 
     defaultConfig {
-        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId = "com.wien_talks"
-        // You can update the following values to match your application needs.
-        // For more information, see: https://flutter.dev/to/review-gradle-config.
         minSdk = flutter.minSdkVersion
         targetSdk = flutter.targetSdkVersion
         versionCode = flutter.versionCode
@@ -32,9 +51,18 @@ android {
 
     buildTypes {
         release {
-            // TODO: Add your own signing config for the release build.
-            // Signing with the debug keys for now, so `flutter run --release` works.
-            signingConfig = signingConfigs.getByName("debug")
+            signingConfig = signingConfigs.findByName("release")
+                ?: signingConfigs.getByName("debug")
+
+        isMinifyEnabled = true
+        isShrinkResources = true
+
+        proguardFiles(
+            getDefaultProguardFile("proguard-android-optimize.txt"),
+            "proguard-rules.pro"
+         )
+        }
+        debug {
         }
     }
 }

wien_talks/wien_talks_flutter/android/app/proguard-rules.pro

@@ -0,0 +1,8 @@
+-keep class io.flutter.embedding.** { *; }
+-keep class io.flutter.plugins.** { *; }
+-keep class io.flutter.** { *; }
+
+-keep class com.google.android.gms.** { *; }
+-dontwarn com.google.android.gms.**
+
+-dontwarn kotlinx.coroutines.**

wien_talks/wien_talks_flutter/lib/screens/show_latest_news_widget.dart

@@ -105,6 +105,7 @@ class _LatestQuotesScreenState extends State<LatestQuotesScreen> {
     return LayoutBuilder(
       builder: (context, constraints) {
         return MasonryGridView.count(
+          cacheExtent: 20,
           crossAxisCount: 2,
           mainAxisSpacing: 8,
           crossAxisSpacing: 8,