works now

android/app/build.gradle

@@ -44,7 +44,7 @@ android {
 
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
-        applicationId "com.example.demoapp"
+        applicationId "com.oggauergemeindetrommler.app"
         // 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 19

android/app/src/debug/AndroidManifest.xml

@@ -1,5 +1,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.example.demoapp">
+    package="com.oggauergemeindetrommler.app">
     <!-- The INTERNET permission is required for development. Specifically,
          the Flutter tool needs it to communicate with the running application
          to allow setting breakpoints, to provide hot reload, etc.

android/app/src/main/AndroidManifest.xml

@@ -1,5 +1,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.example.demoapp">
+    package="com.oggauergemeindetrommler.app">
    <application
         android:label="Oggauer Gemeindetrommler"
         android:name="${applicationName}"

android/app/src/main/kotlin/com/oggauergemeindetrommler/app/MainActivity.kt

@@ -1,4 +1,4 @@
-package com.example.oggauer_gemeindetrommler
+package com.oggauergemeindetrommler.app
 
 import io.flutter.embedding.android.FlutterActivity
 

android/app/src/profile/AndroidManifest.xml

@@ -1,5 +1,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.example.oggauer_gemeindetrommler">
+    package="com.oggauergemeindetrommler.app">
     <!-- The INTERNET permission is required for development. Specifically,
          the Flutter tool needs it to communicate with the running application
          to allow setting breakpoints, to provide hot reload, etc.