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Bug 2053

Summary: Android can't find SDL2's JNI functions by name
Product: SDL Reporter: Dan Hatch <danhatch333>
Component: *don't know*Assignee: Gabriel Jacobo <gabomdq>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2 CC: gabomdq
Version: 2.0.0   
Hardware: x86_64   
OS: Linux   

Description Dan Hatch 2013-08-22 06:15:18 UTC 
I've replaced sdl-hg with the SDL2-2.0.0 source in my android project and did a full recompile(had to reflect change of 'SDL2/src/main/android/SDL_android_main.c'). When I run the app, it crashes on both a real device and the emulator.

My project is C++, which might be mangling the JNI glue function names. If I add 'extern "C"' though I get a bunch of syntax errors which suggests it's being compiled as C, so maybe this isn't the problem?


Error on Real Device:
I/SDL     (20310): SDL_Android_Init()
W/IInputConnectionWrapper(20149): showStatusIcon on inactive InputConnection
W/SDL     (20310): SDL: Couldn't locate Java callbacks, check that they're named and typed correctly
I/SDL     (20310): SDL_Android_Init() finished!
I/DEBUG   (20203): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***


Error in Emulator:
I/SDL     (  410): SDL_Android_Init()
W/dalvikvm(  410): JNI WARNING: JNI method called with exception raised
W/dalvikvm(  410):              in Lorg/libsdl/app/SDLActivity;.nativeInit ()V (GetStaticMethodID)
W/dalvikvm(  410): Pending exception is:
I/dalvikvm(  410): Ljava/lang/NoSuchMethodError;: audioInit
I/dalvikvm(  410): 	at org.libsdl.app.SDLActivity.nativeInit(Native Method)
I/dalvikvm(  410): 	at org.libsdl.app.SDLMain.run(SDLActivity.java:516)
I/dalvikvm(  410): 	at java.lang.Thread.run(Thread.java:1019)
I/dalvikvm(  410): "SDLThread" prio=5 tid=9 NATIVE
I/dalvikvm(  410):   | group="main" sCount=0 dsCount=0 obj=0x40522488 self=0x2a2110
I/dalvikvm(  410):   | sysTid=418 nice=0 sched=0/0 cgrp=default handle=2760072
I/dalvikvm(  410):   | schedstat=( 4012991 82880980 8 )
I/dalvikvm(  410):   at org.libsdl.app.SDLActivity.nativeInit(Native Method)
I/dalvikvm(  410):   at org.libsdl.app.SDLMain.run(SDLActivity.java:516)
I/dalvikvm(  410):   at java.lang.Thread.run(Thread.java:1019)
Comment 1 Gabriel Jacobo 2013-08-22 13:02:50 UTC 
It doesn't look like it's a C++ problem. The error says that the C code couldn't get a hold of the audioInit method on the Java side. Are you using the stock SDLActivity.java file? Any customizations to the Android project file?
Comment 2 Dan Hatch 2013-08-22 17:49:04 UTC 
Thank you! Updating SDLActivity.java fixed it.