[仕事の積み重ね]Android dynamic library&JNI_OnLoad

Bionic libc doesn't load dependencies for current .so file (diff from Windows or Linux)
so a explicit calling of Java's System.loadLibrary() is needed, in order to load depedency libraries. otherwise the original .so will fail to load.
 
JNI_OnLoad will be called mostly on  System.LoadLibrary() or equavilent calls
System.loadLibrary("gnustl_shared");
 
the .so file is loaded & and symbol get loaded by common dynamic library function:
dlopen
dlsym
 
if the symbol "JNI_OnLoad"is not found in the lib, dalvik will simply do nothing, but a Debug Log: No JNI_OnLoad found in xxx.so, skipping init.
 
details at:
  dalvik/vm/Native.c
 
NatvieAcitviy: JNI_OnLoad is not get called
For the startup library speicified by "android.app.lib_name", system will auto-load library on activity startup, but JNI_OnLoad is not get called, only libs loaded by System.loadLibrary() will.
but you can use native activity and load the library manually for the second time, so that JNI_OnLoad & all other activity binding function is exposed.
 
in AndroidManifest.xml:

            <meta-data android:name="android.app.lib_name"

                  android:value="GameLibrary" />

in Game Activity.java - load it manually:

1 public class GameActivity extends NativeActivity {

2     ....

3     static {

4         System.loadLibrary("GameLibrary");

5     }

6 }