1. Configure JDK, NDK path environments

I'm using jdk 1.8.0_65 and ndk-bundle. We can use the official ndk also.

2. Add javah, ndk-build as External Tools

(Menu Location is 'Settings > Tools > External Tools')

2-1. Configure javah

2-2. Configure ndk-build

2-3. Configure ndk-build clean

3. Create a new Android Studio Project

4. Add a java class for JNI

5. Create a folder for JNI

6. Configure build.gradle

android {
  ...
  defaultConfig {
    ...
    ndk {
      moduleName "your dllname"
    }

    sourceSets.main {
      jni.srcDirs = []
      jniLibs.srcDir "src/main/libs"
    }
    ...
  }
  ...
}

7. First Build

We will encounter an error like 'Error: NDK integration is deprecated in the current plugin. blah blah'.

Because we are not using the experimental class for NDK.

Let's add one line in 'gradle.properties'.

android.useDeprecatedNdk=true

And build again, it must be succeeded.

8. Create a JNI header file

Use 'NDK external tools - javah'

Then we will have a JNI header file.

9. Create a C++ source file

We don't need to check "Create associated header".

10. Create some MakeFiles

Android.mk

Application.mk

11. Build Our NDK Library

12. Let's Use Our NDK Library Function

13. Final Build and Create APK

After build, We must have our library in the APK.

14. Let's Enjoy NDK :)