如何在Android Studio中调用c++源码？

android {
    // ...
    externalNativeBuild {
        cmake {
            path "CMakeLists.txt"
        }
    }
    // ...
}

cmake_minimum_required(VERSION 3.4.1)

add_library(
    native-lib
    SHARED
    native-lib.cpp
)

# 链接静态库或动态库
target_link_libraries(
    native-lib
    log
)

public class MainActivity extends AppCompatActivity {
    // ...

    public native String stringFromJNI();

    // ...
}

public class MainActivity extends AppCompatActivity {
    // ...

    static {
        System.loadLibrary("native-lib");
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // ...

        String result = stringFromJNI();
        Log.d("JNI", "Result: " + result);

        // ...
    }

    // ...
}