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https://github.com/nicosnicolaou16/flutterandroidprojectandndk

This project is just the setup for the NDK in android, the communication Android project with C/C++ file. In this example we print only a text from C/C++ file to Android Project.
https://github.com/nicosnicolaou16/flutterandroidprojectandndk

android c cmake dart flutter flutter-app kotlin kotlin-android ndk ndk-cmake

Last synced: 17 days ago
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This project is just the setup for the NDK in android, the communication Android project with C/C++ file. In this example we print only a text from C/C++ file to Android Project.

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# Flutter Android Project and NDK

This project is just the setup for the NDK in android, the communication Android project with C/C++
file. In this
example we print only a text from C/C++ file to Android Project.
The communication between Android Native with Flutter, I used channel (check the references). But, if you need an extra example about the channel check my repository for more information. https://github.com/NicosNicolaou16/ExampleChannelNativeAndroidWithCustomData

NOTE: EXAMPLE ONLY FOR ANDROID

## Similar project with (Dart Language)

https://github.com/NicosNicolaou16/AndroidProjectAndNDK

## Versions

Flutter SDK version: 3.24.4

Dart Version: 3.5.4

# Setup - Steps

- Install the latest NDK and CMake version from Android Studio SDK Manager from the SDK Tools
section.
- Create the cpp package, add the CMake .txt and .cpp file. Some name below is base on .cpp file
name.

```cmake
# For more information about using CMake with Android Studio, read the
# documentation: https://d.android.com/studio/projects/add-native-code.html

# Sets the minimum version of CMake required to build the native library.

cmake_minimum_required(VERSION 3.4.1)

# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.

add_library( # Sets the name of the library.
message # based on .cpp file name

# Sets the library as a shared library.
SHARED

# Provides a relative path to your source file(s).
message.cpp) # based on .cpp file name

# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.

find_library( # Sets the name of the path variable.
log-lib

# Specifies the name of the NDK library that
# you want CMake to locate.
log)

# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.

target_link_libraries( # Specifies the target library.
message # based on .cpp file name

# Links the target library to the log library
# included in the NDK.
${log-lib})
```

- Add the follow code in Gradle file.

```Kotlin
android {

//Other Gradle Code Here...

externalNativeBuild {
cmake {
path = file("src/main/cpp/CMakeLists.txt")
version = "3.31.0"
}
}
ndkVersion = "27.2.12479018"

//Other Gradle Code Here...
}
```

- Load the C/C++ file.

```Kotlin
companion object {
/**
* Load the C file
* */
init {
System.loadLibrary("message")
}
}
```

- Initialize the method(s) from .cpp file.

```Kotlin
private external fun message(): String
```

## Check my article
https://medium.com/@nicosnicolaou/ndk-setup-on-android-flutter-android-project-1571d9a3f5cb

# References/Tutorials Follow

https://github.com/android/ndk-samples

https://developer.android.com/studio/projects/add-native-code

https://blog.mindorks.com/getting-started-with-android-ndk-android-tutorial/

https://medium.com/@shreebhagwat94/flutter-platform-channel-46578d21e69

https://blog.devgenius.io/use-flutter-screens-in-native-android-app-share-data-among-them-d97d670807a6