Unable to call the c++ method from android native

kranthi

Hi,
I want to call c/c++ function from android java code, when i register the c methods using QAndroidJniEnvironment
I am not able to call the java method from c++. if dont register, then i can able to call java methods from c++. But communication should happened both the ways. below it the sample code i have used for registering native methods.
@
void registerNativeMethods() {
JNINativeMethod methods[] = {{"callNativeOne", "(I)V", reinterpret_cast<void *>(fromJavaOne)},
{"callNativeTwo", "(I)V", reinterpret_cast<void *>(fromJavaTwo)}};

QAndroidJniObject javaClass("org/qtproject/example/notification/NotificationClient");
qDebug()<<"java class is valid? <<"<<javaClass.isValid();
QAndroidJniEnvironment env;
jclass objectClass = env->GetObjectClass(javaClass.object<jobject>());

qDebug()<<"registernative returned ::"<< env->RegisterNatives(objectClass,
methods,2
/sizeof(methods) / sizeof(methods[0]/);
env->DeleteLocalRef(objectClass);
}
@

Please provide the solution for this problem

Thanks and Regards
Kranthi Talluri

[edit: Added missing coding tags @ SGaist]

zsb123

Hello!

I had the same issue. I've spent my whole day trying to figure out what can the problem be. Now that I figured it out, I felt it important to register to this forum and share the solution with you.

So... At the end of your registerNativeMethods() method add the following code:
@ if (env->ExceptionCheck()) {
// Handle exception here.
env->ExceptionClear();
}@

You should also check "this part":http://qt-project.org/doc/qt-5/qandroidjniobject.html#handling-java-exception of the documentation.

Let me know if it helped for you as well.