Get the Android Java Native Interface Environment of the current thread.
Defined in <SDL3/SDL_system.h>
void * SDL_GetAndroidJNIEnv(void);(void *) Returns a pointer to Java native interface object (JNIEnv) to which the current thread is attached, or NULL on failure; call SDL_GetError() for more information.
This is the JNIEnv one needs to access the Java virtual machine from native code, and is needed for many Android APIs to be usable from C.
The prototype of the function in SDL's code actually declare a void* return type, even if the implementation returns a pointer to a JNIEnv. The rationale being that the SDL headers can avoid including jni.h.
It is safe to call this function from any thread.
This function is available since SDL 3.1.3.
#include <SDL3/SDL.h>
#include <jni.h>
// This example requires C++ and a custom Java method named "void showHome()"
// Calls the void showHome() method of the Java instance of the activity.
void showHome(void)
{
// retrieve the JNI environment.
JNIEnv* env = (JNIEnv*)SDL_GetAndroidJNIEnv();
// retrieve the Java instance of the SDLActivity
jobject activity = (jobject)SDL_GetAndroidActivity();
// find the Java class of the activity. It should be SDLActivity or a subclass of it.
jclass clazz(env->GetObjectClass(activity));
// find the identifier of the method to call
jmethodID method_id = env->GetMethodID(clazz, "showHome", "()V");
// effectively call the Java method
env->CallVoidMethod(activity, method_id);
// clean up the local references.
env->DeleteLocalRef(activity);
env->DeleteLocalRef(clazz);
// Warning (and discussion of implementation details of SDL for Android):
// Local references are automatically deleted if a native function called
// from Java side returns. For SDL this native function is main() itself.
// Therefore references need to be manually deleted because otherwise the
// references will first be cleaned if main() returns (application exit).
}