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javaandroid-studioandroid-ndkjava-native-interfaceshared-libraries

How to use the generated .so library in another Android Project?

I’ve followed http://kn-gloryo.github.io/Build_NDK_AndroidStudio_detail/ and it works well! However, I want to use the generated .so library in a new Android application, and I simply don’t know how to do this... I’ve been struggling for days and if any step-by-step tutorial can be shared that would be helpful!

This is the Android Project MyApp which I used to generate the .so files:

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MainActivity :

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Java Class : MyNDK

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header file: com_demo_ble_myapp_MyNDK.h

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Cpp file: MyLibrary

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And this is the structure of my new Android project useSOLib, I simply copy all the so files from MyApp\app\src\main\libs to useSoLib\app\src\main\jniLibs

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And this is MainActivity in useSoLib:

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I can Build-> Make Project successfully, but when I run it on the device, the app shows "Unfortunately, useSoLib has stopped." and crushed. I know I miss some steps here, but I'm new to Android Studio so I have no clue where I should start with... thank you in advance for any suggestions! :)

Solution

  • You should import MyNDK and use its instance. JNI library is related to Java class. Change the code:

    public class MainActivity extends AppCompatActivity{
   @Override
   protected void onCreate(Bundle savedInstanceState){

       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       Log.i("MyTag", new MyNDK().getMyString());
   }
}

    You can either export the MyNDK class as a jar package or create an aar bundle. Then import the Java class into your new project with JNI library.

    The post How to Build *.so Library Files into AAR Bundle in Android Studio may help you.