The author details their experience integrating a C++ AI assistant into an Android app using JNI. JNI serves as the essential link between Java/Kotlin and C/C++ code. This interface is crucial for performance-intensive tasks and accessing low-level Android APIs. The author found the process initially disorienting, feeling like they were learning an additional complex language. Debugging proved challenging, with subtle errors like forgotten DeleteLocalRef calls causing critical app failures. The project required bridging the Java and C++ environments, leading to common JNI pitfalls. Understanding JNI's mechanics is key to successful native integration. The author aims to share their insights on what went wrong and what worked. This knowledge will help others navigating similar JNI challenges. The goal is to simplify the development process for those using JNI.