java.lang.UnsatisfiedLinkError: No implementation found for int com.myapp.SDLActivity.nativeSetupJNI()

SDL Development
1

When I run my app on emulator in Android studio in debian I get next error:

11-29 07:41:22.147 2583-2583/com.example.administrator.myapp E/art: No implementation found for int com.example.administrator.myapp.SDLActivity.nativeSetupJNI() (tried Java_com_example_administrator_myapp_SDLActivity_nativeSetupJNI and Java_com_example_administrator_myapp_SDLActivity_nativeSetupJNI__)
11-29 07:41:22.155 2583-2583/com.example.administrator.myapp E/AndroidRuntime: FATAL EXCEPTION: main
 	Process: com.example.administrator.myapp, PID: 2583
 	java.lang.UnsatisfiedLinkError: No implementation found for int com.example.administrator.myapp.SDLActivity.nativeSetupJNI() (tried Java_com_example_administrator_myapp_SDLActivity_nativeSetupJNI and Java_com_example_administrator_myapp_SDLActivity_nativeSetupJNI__)
	at com.example.administrator.myapp.SDLActivity.nativeSetupJNI(Native Method)
	at com.example.administrator.myapp.SDL.setupJNI(SDL.java:14)
	at com.example.administrator.myapp.SDLActivity.onCreate(SDLActivity.java:190)
	at android.app.Activity.performCreate(Activity.java:6679)
	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2618)
 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
 	at android.app.ActivityThread.-wrap12(ActivityThread.java)
 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
 	at android.os.Handler.dispatchMessage(Handler.java:102)
 	at android.os.Looper.loop(Looper.java:154)
 	at android.app.ActivityThread.main(ActivityThread.java:6119)
 	at java.lang.reflect.Method.invoke(Native Method)
 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

I am using SDL2-2.0.7, SDL2_image-2.0.2 and SDL2_mixer-2.0.2 and folder android-project as my start point for my project.

2

You need to not rename SDLActivity or change which package it’s in, because java will look for particular C functions needed to implement SDL based on both the class and package names. If you want your application to have a different class name, then you need to make a new class that derives from SDLActivity instead of renaming SDLActivity. That way, SDLActivity will still have the correct name and Java will find the correct functions. See http://blog.stuff-o-matic.com/post/2013/10/20/ASGP-s-Android-Port-Part-IV%3A-building-the-APK for some examples.

1 Like
3

I have changed only package name from “package org.libsdl.app;” to “package com.example.administrator.myapp;” in SDLActivity.java and other similar java-files which I have copied from android-project folder.
I still have this line:

public class SDLActivity extends Activity {

and in AndroidManifest.xml I have this:

<activity android:name="SDLActivity"

4

Into the file /SDL2/src/core/android/SDL_android.c I found a line:

#define SDL_JAVA_PREFIX org_libsdl_app

but in the file AndroidManifest.xml there is a line:

<!-- Replace org.libsdl.app with the identifier of your game below, e.g.
     com.gamemaker.game
-->

It seems I can’t change package name of my app from default ‘org.libsdl.app’, right?

5

@Jacob_Lifshay, thanks for useful advice.

6

You should create your own activity class that extends the SDL one. You can put your own class into any package and leave the SDL one where it is.

1 Like
7

Oops, that was already stated above. After that you should be able to use any applicationId/package name you want. Note that the package name from the manifest is actually overridden by the applicationId from the app/build.gradle file (if I recall correctly).

8

@ollika, thank you!
I have created now my own java-class and have changed package name into the AndroidManifest.xml file and it works.