Here’s a rewritten and polished version of your README to make it more professional, clearer, and easier to follow:

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📱 Android Native C++ Integration Example

This project demonstrates how to build an Android application that integrates with C++ native code using the Java Native Interface (JNI). It’s ideal for performance-critical operations or reusing existing native libraries in Android apps.

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✨ Features

• Android app built with Java
• Native functionality implemented in C++
• Communication between Java and C++ via JNI
• Built using Android Studio with CMake

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🛠️ Technologies

• Java – Android framework and UI
• C++ – Native logic implementation
• JNI – Bridge between Java and C++
• Android Studio – Project IDE
• CMake – Native build system

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🚀 Getting Started

1. Add Native Library Files

Place your native files in the following directory:

android-project/app/src/main/cpp/testadd/

Include:

• .so library file
• Corresponding header (.h) file

2. Configure CMake

Update your CMakeLists.txt located at:

android-project/app/src/main/cpp/CMakeLists.txt

Ensure it properly includes and links your .so library and headers.

3. Call Native Code

Use native-lib.cpp to call your JNI-exposed functions. File location:

android-project/app/src/main/cpp/native-lib.cpp

You can define your native methods here and link them with your Java classes.

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📂 Project Structure

android-project/
├── app/
│   └── src/
│       └── main/
│           └── cpp/
│               ├── testadd/          # Place native .so and .h files here
│               ├── native-lib.cpp    # Implement JNI functions here
│               └── CMakeLists.txt    # CMake configuration

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📘 Notes

• Make sure your .so file matches the target architecture (e.g., armeabi-v7a, arm64-v8a, etc.).
• Rebuild the project after modifying native code or CMake configuration.

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Let me know if you'd like to include a code sample or a usage example as well.