Where to place JNI/native libraries in Android Studio Project

Question

I am trying to compile the following code:

https://android.googlesource.com/platform/packages/inputmethods/LatinIME/+/master

into an apk file.

To do

Answer 1

The typical structure of an Android project with jni support is as below:

.
├── CMakeLists.txt // Your cmake configuration files. 
├── app.iml
├── build
├── build.gradle
├── libs
├── proguard-rules.pro
└── src
    ├── androidTest
    │   └── java
    ├── main
    │   ├── AndroidManifest.xml
    │   ├── cpp // Directory to put your jni native source code. 
    │   │   └── native-lib.cpp
    │   ├── java
    │   ├── jniLibs // Directory to put your jni libs, i.e. the .so files. 
    │   └── res
    └── test
        └── java

But, theoretically you can configure your jniLibs path anywhere that you like inside the app level build.gradle file.

android {
    ...
    defaultConfig {
        ...
        externalNativeBuild {
            cmake {
                cppFlags "-frtti -fexceptions"
            }
        }
    }
    ...
    externalNativeBuild {
        cmake {
            path "CMakeLists.txt"
        }
    }
    ...
    sourceSets {
        main {
            // put your jni libs.
            jniLibs.srcDirs += "${projectDir}/jniLibs"]
        }
        debug {
            // put your debug version jni libs.
            jniLibs.srcDirs += "${projectDir}/jniLibs/debug"]
        }
        release {
            // put your release version jni libs.
            jniLibs.srcDirs += "${projectDir}/jniLibs/release"]
        }
    }
    ...
}

---

For Android Studio 3.0+, you don't need to explicitly configure the jniLibs path for your c/c++ source code as it will be automatically managed by Android Studio. All those c/c++ source code under src/main/cpp will be compiled and packaged into your apk automatically.