upgraded stuff, prepared for notifications, renamed app. No actual code-changes :/

android/app/build.gradle

@@ -26,10 +26,13 @@ apply plugin: 'kotlin-android'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion flutter.compileSdkVersion
+    //compileSdkVersion flutter.compileSdkVersion
+    compileSdkVersion 33 //default: 31, flutter_local_notification needs min 33
     ndkVersion flutter.ndkVersion
 
     compileOptions {
+        //coreLibraryDesugaringEnabled true //flutter_local_notification
+
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
     }
@@ -43,14 +46,18 @@ android {
     }
 
     defaultConfig {
-        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
-        applicationId "cloud.dresselhaus.nextcloud_reminder.nextcloud_reminder"
+        applicationId "cloud.dresselhaus.todotxt_reminder"
         // 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
-        targetSdkVersion flutter.targetSdkVersion
+        //minSdkVersion flutter.minSdkVersion
+        minSdkVersion 20
+        //targetSdkVersion flutter.targetSdkVersion
+        targetSdkVersion 33 //flutter.targetSdkVersion //33 = Android 13 = needed for request of notification-permissions.
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
+
+        //flutter_local_notification
+        multiDexEnabled true
     }
 
     buildTypes {
@@ -67,5 +74,8 @@ flutter {
 }
 
 dependencies {
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:2.0.0' //1.1.5
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
+    implementation 'androidx.window:window:1.0.0'      //flutter_local_notification for Android 12L
+    implementation 'androidx.window:window-java:1.0.0' //flutter_local_notification for Android 12L
 }

android/app/proguard-rules.pro

@@ -0,0 +1,28 @@
+# FROM: https://github.com/MaikuB/flutter_local_notifications/blob/master/flutter_local_notifications/example/android/app/proguard-rules.pro
+## Gson rules
+# Gson uses generic type information stored in a class file when working with fields. Proguard
+# removes such information by default, so configure it to keep all of it.
+-keepattributes Signature
+
+# For using GSON @Expose annotation
+-keepattributes *Annotation*
+
+# Gson specific classes
+-dontwarn sun.misc.**
+#-keep class com.google.gson.stream.** { *; }
+
+# Prevent proguard from stripping interface information from TypeAdapter, TypeAdapterFactory,
+# JsonSerializer, JsonDeserializer instances (so they can be used in @JsonAdapter)
+-keep class * extends com.google.gson.TypeAdapter
+-keep class * implements com.google.gson.TypeAdapterFactory
+-keep class * implements com.google.gson.JsonSerializer
+-keep class * implements com.google.gson.JsonDeserializer
+
+# Prevent R8 from leaving Data object members always null
+-keepclassmembers,allowobfuscation class * {
+  @com.google.gson.annotations.SerializedName <fields>;
+}
+
+# Retain generic signatures of TypeToken and its subclasses with R8 version 3.0 and higher.
+-keep,allowobfuscation,allowshrinking class com.google.gson.reflect.TypeToken
+-keep,allowobfuscation,allowshrinking class * extends com.google.gson.reflect.TypeToken

android/app/src/debug/AndroidManifest.xml

@@ -1,5 +1,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="cloud.dresselhaus.nextcloud_reminder.nextcloud_reminder">
+    package="cloud.dresselhaus.todotxt_reminder">
     <!-- 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

@@ -1,7 +1,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="cloud.dresselhaus.nextcloud_reminder.nextcloud_reminder">
-   <application
-        android:label="nextcloud_reminder"
+    package="cloud.dresselhaus.todotxt_reminder">
+    <application
+        android:label="Todo.txt Reminder"
         android:name="${applicationName}"
         android:icon="@mipmap/ic_launcher">
         <activity

android/app/src/main/kotlin/cloud/dresselhaus/nextcloud_reminder/nextcloud_reminder/MainActivity.kt

@@ -1,4 +1,4 @@
-package cloud.dresselhaus.nextcloud_reminder.nextcloud_reminder
+package cloud.dresselhaus.todotxt_reminder
 
 import io.flutter.embedding.android.FlutterActivity
 

android/app/src/main/res/raw/keep.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- example from https://github.com/MaikuB/flutter_local_notifications/blob/master/flutter_local_notifications/example/android/app/src/main/res/raw/keep.xml
+See: https://pub.dev/packages/flutter_local_notifications#release-build-configuration
+-->
+<!--resources xmlns:tools="http://schemas.android.com/tools"
+    tools:keep="@drawable/*,@raw/slow_spring_board" /-->
+
+<resources xmlns:tools="http://schemas.android.com/tools"
+    tools:keep="@drawable/*" />

android/app/src/profile/AndroidManifest.xml

@@ -1,5 +1,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="cloud.dresselhaus.nextcloud_reminder.nextcloud_reminder">
+        package="cloud.dresselhaus.todotxt_reminder">
     <!-- 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/build.gradle

@@ -1,12 +1,12 @@
 buildscript {
-    ext.kotlin_version = '1.6.10'
+    ext.kotlin_version = '1.7.10'
     repositories {
         google()
         mavenCentral()
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:7.1.2'
+        classpath 'com.android.tools.build:gradle:7.3.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }

android/gradle/wrapper/gradle-wrapper.properties

@@ -2,4 +2,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.5.1-all.zip