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| Deletions are marked like this. | Additions are marked like this. |
| Line 31: | Line 31: |
| jclass clazz( env->GetObjectClass(activity) ); | jclass clazz(env->GetObjectClass(activity)); |
| Line 34: | Line 34: |
| jmethodID method_id = env->GetMethodID( clazz, "showHome", "()V" ); | jmethodID method_id = env->GetMethodID(clazz, "showHome", "()V"); |
| Line 37: | Line 37: |
| env->CallVoidMethod( activity, method_id ); |
env->CallVoidMethod(activity, method_id); |
DRAFT |
SDL_AndroidGetJNIEnv
Use this function to retrieve the Java native interface object (JNIEnv) of the current thread on Android builds.
Syntax
void* SDL_AndroidGetJNIEnv(void)
Return Value
Returns a pointer to Java native interface object (JNIEnv) to which the current thread is attached, or 0 on error.
Code Examples
// Calls the void MyActivity.showHome() method of the Java instance of MyActivity.
void showHome(void)
{
// retrieve the JNI environment.
JNIEnv* env = (JNIEnv*)SDL_AndroidGetJNIEnv();
// retrieve the Java instance of the SDLActivity
jobject activity = (jobject)SDL_AndroidGetActivity();
// 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);
}
Remarks
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 it allows not to include jni.h in the headers of the SDL.
Version
This function is available in SDL 2.0.0
