Add Admin to relations demo

dev-doc/updating-c-library.md

@@ -18,6 +18,9 @@ Update `flutter_libs` and `sync_flutter_libs` with **compatible library versions
   - Shortcut: search and replace `-android:3.1.3` in `build.gradle` files.
   - In [flutter_libs](../flutter_libs/android/build.gradle)
   - In [sync_flutter_libs](../sync_flutter_libs/android/build.gradle)
+- Android in examples.
+  - Shortcut: search and replace `-android-objectbrowser:3.1.3` in `build.gradle` files. 
+  - In [objectbox_demo_relations](../objectbox/example/flutter/objectbox_demo_relations/android/app/build.gradle)
 - Swift (iOS/macOS) ([view releases](https://github.com/objectbox/objectbox-swift/releases))
   - Shortcut: search and replace e.g. `s.dependency 'ObjectBox', '1.7.0` in `.podspec` files.
   - In [flutter_libs for iOS](../flutter_libs/ios/objectbox_flutter_libs.podspec)

objectbox/example/flutter/objectbox_demo_relations/README.md

@@ -9,7 +9,9 @@ See how to:
 - create Boxes and put Objects there ([objectbox.dart](lib/objectbox.dart))
 - query for Objects ([objectbox.dart](lib/objectbox.dart))
 - create, read, update and delete Objects ([main.dart](lib/main.dart))
+- add ObjectBox Admin for debug builds ([objectbox.dart](lib/objectbox.dart), [build.gradle](android/app/build.gradle))
 
 ## Docs
 - [Getting started with ObjectBox](https://docs.objectbox.io/getting-started)
 - [How to use ObjectBox Relations](https://docs.objectbox.io/relations)
+- [ObjectBox Admin](https://docs.objectbox.io/data-browser)

objectbox/example/flutter/objectbox_demo_relations/android/app/build.gradle

@@ -70,6 +70,21 @@ flutter {
     source '../..'
 }
 
+// Optional: add ObjectBox Admin - https://docs.objectbox.io/data-browser
+// Tell Gradle to exclude the objectbox-android dependency from debug builds
+// that is added by objectbox_flutter_libs. Keeps it for release and profile builds.
+configurations {
+    debugImplementation {
+        exclude group: 'io.objectbox', module: 'objectbox-android'
+    }
+}
+
 dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+
+    // Optional: add ObjectBox Admin - https://docs.objectbox.io/data-browser
+    // Add objectbox-android-objectbrowser only for debug builds.
+    // Warning: when objectbox_flutter_libs updates check if version
+    // needs update, e.g. check https://github.com/objectbox/objectbox-dart/releases.
+    debugImplementation("io.objectbox:objectbox-android-objectbrowser:3.1.3")
 }

objectbox/example/flutter/objectbox_demo_relations/lib/objectbox.dart

@@ -7,6 +7,7 @@ import 'objectbox.g.dart'; // created by `flutter pub run build_runner build`
 class ObjectBox {
   /// The Store of this app.
   late final Store store;
+  late final Admin _admin;
 
   /// Two Boxes: one for Tasks, one for Tags.
   late final Box<Task> taskBox;
@@ -17,6 +18,13 @@ class ObjectBox {
   late final Stream<Query<Tag>> tagsStream;
 
   ObjectBox._create(this.store) {
+    // Optional: enable ObjectBox Admin on debug builds.
+    // https://docs.objectbox.io/data-browser
+    if (Admin.isAvailable()) {
+      // Keep a reference until no longer needed or manually closed.
+      _admin = Admin(store);
+    }
+
     taskBox = Box<Task>(store);
     tagBox = Box<Tag>(store);