In order to install realm, requires as follows, in build.gradle (:app)

apply plugin: 'realm-android'

in build.gradle (:Project level)

buildscript {
    ext.realm_version = '10.15.1'
    repositories {
        google()
        maven { url "https://github.com/realm/realm-java" } // Realm repository
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:8.3.1'
        classpath "io.realm:realm-gradle-plugin:$realm_version"
        classpath "io.realm:realm-gradle-plugin:$realm_version-transformer-api"
        classpath "io.realm:realm-gradle-plugin:10.15.1" // Use the latest version
    }
}

What Each Line Does:

• Android Gradle Plugin (com.android.tools.build:gradle): Required for building Android projects.
• Realm Gradle Plugin (io.realm:realm-gradle-plugin): Integrates Realm into the build process, enabling schema management and other Realm features.
• Transformer API (io.realm:realm-gradle-plugin:$realm_version-transformer-api):
  • Adds support for advanced features like Realm class transformations (only required in certain cases).
• Explicit Version (io.realm:realm-gradle-plugin:10.15.1):
  • Ensures the latest version is used directly (useful for debugging or ensuring compatibility).

How it Works Together

1. Project-Level Setup:

   • The build.gradle (:Project level) file configures the build environment with the necessary dependencies and repositories to use Realm.
   • It ensures the Realm Gradle plugin is available during the build process.

2. Module-Level Plugin:

   • The build.gradle (:app) file applies the realm-android plugin to enable Realm features for your app.

3. Compilation and Integration:

   • During the build, the Realm Gradle plugin processes your model classes and generates the necessary schema code for the Realm database.
   • The plugin also ensures that Realm’s libraries and dependencies are included in your APK.

Simplified Version

Here’s a streamlined version of your configuration:

Project-Level build.gradle

 buildscript {
ext.realm_version = '10.15.1'
repositories {
google()
maven { url "https://github.com/realm/realm-java" }
}
dependencies {
classpath 'com.android.tools.build:gradle:8.3.1'
classpath "io.realm:realm-gradle-plugin:$realm_version"
}
}


App-Level build.gradle

apply plugin: 'realm-android'


This configuration should be sufficient for most cases unless advanced features are needed.