No implementation found for void jsqlite.Database.internal_init

[Jean-Yves Hallé]

I am trying to run SpatiaLite on Android by doing what the tutorial is showing there (in the Open a database section):
https://www.gaia-gis.it/fossil/libspatialite/wiki?name=spatialite-android-tutorial

But I get an error on the line:

    db = new jsqlite.Database();

The error is:
Caused by: java.lang.UnsatisfiedLinkError: No implementation found for void jsqlite.Database.internal_init() (tried Java_jsqlite_Database_internal_1init and Java_jsqlite_Database_internal_1init__)
        at jsqlite.Database.internal_init(Native Method)
        at jsqlite.Database.<clinit>(Database.java:956)
        at sygif.testspatialite2.MainActivity.HelloOnClick(MainActivity.java:23)
        at java.lang.reflect.Method.invoke(Native Method) 
        at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:384) 
        at android.view.View.performClick(View.java:6579) 
        at android.view.View.performClickInternal(View.java:6556) 
        at android.view.View.access$3100(View.java:777) 
        at android.view.View$PerformClick.run(View.java:25660) 
        at android.os.Handler.handleCallback(Handler.java:819) 
        at android.os.Handler.dispatchMessage(Handler.java:99) 
        at android.os.Looper.loop(Looper.java:164) 
        at android.app.ActivityThread.main(ActivityThread.java:6656) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823) 

It seems to be the same than this post:
https://groups.google.com/forum/#!topic/spatialite-users/pPf7H1SsH08

But I tried to change the sdk version and nothing changes. I don't understand why the code compile but I get this error. The code should not compile?

[Jean-Yves Hallé]

I found that the SO files from Jsqlite were not included in my project (they were not in the right folder). I had to put them in src\main\jniLibs and now it works.