The integration of Java SDKs into Android applications is made possible through the use of low-code approaches that allow for easy communication with various APIs. APIMatic provides a developer experience platform that offers automatic code generation for API specifications in multiple languages, including Java. By utilizing client SDKs, developers can reduce manual coding and increase API adoption. The choice between using JAR or AAR files depends on the need to include resources such as layouts and drawables, with JAR being a better option due to its lightweight nature and compatibility with IDEs like Eclipse and Android Studio. Maven is used as the project management tool for APIMatic SDKs, allowing for easy integration into existing Java applications. Gradle's build system makes it easier to include external binaries and library modules, enabling developers to consume Maven libraries with ease. The Calculator SDK can be integrated into Android applications using either remote or local dependencies, with options available in Android Studio and through the use of Gradle settings files. Once the dependency is resolved, developers can easily use the SDK components in their application, as demonstrated by Java and Kotlin code samples.