firebase issue list working :O

android/app/build.gradle

@@ -47,10 +47,11 @@ android {
         applicationId "com.example.demoapp"
         // You can update the following values to match your application needs.
         // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-build-configuration.
-        minSdkVersion flutter.minSdkVersion
+        minSdkVersion 19
         targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
+        multiDexEnabled true
     }
 
     buildTypes {

android/app/google-services.json

@@ -0,0 +1,46 @@
+{
+  "project_info": {
+    "project_number": "576683162451",
+    "project_id": "gemeinde-trommler",
+    "storage_bucket": "gemeinde-trommler.appspot.com"
+  },
+  "client": [
+    {
+      "client_info": {
+        "mobilesdk_app_id": "1:576683162451:android:b792a81fceafa932083fa6",
+        "android_client_info": {
+          "package_name": "com.example.demoapp"
+        }
+      },
+      "oauth_client": [
+        {
+          "client_id": "576683162451-pl7mb5k00rj5dhg3krqcqh8bpvn8ijbq.apps.googleusercontent.com",
+          "client_type": 3
+        }
+      ],
+      "api_key": [
+        {
+          "current_key": "AIzaSyAWjSjX1f2rGUGHLbXQS873DYY_oXqcHhs"
+        }
+      ],
+      "services": {
+        "appinvite_service": {
+          "other_platform_oauth_client": [
+            {
+              "client_id": "576683162451-pl7mb5k00rj5dhg3krqcqh8bpvn8ijbq.apps.googleusercontent.com",
+              "client_type": 3
+            },
+            {
+              "client_id": "576683162451-vf1g0qoge66lb3bmpsg4neckv4opovub.apps.googleusercontent.com",
+              "client_type": 2,
+              "ios_info": {
+                "bundle_id": "com.example.demoapp"
+              }
+            }
+          ]
+        }
+      }
+    }
+  ],
+  "configuration_version": "1"
+}