Question

After completion of some work in Middleware C library, Need to show few notifications to Notification bar. Please suggest if any work around to show the notifications.This C library doesnt have GUI part of it.

Answer 1

As Nitrex said, you would need to call the method in your Java class via JNI:

In C:

void
Java_com_example_hellojni_HelloJni_doSomeInterestingJob( JNIEnv* env,
                                                         jobject thiz )
{
    jclass cls = (*env)->GetObjectClass(env, thiz);
    jmethodID mid = (*env)->GetMethodID(env, cls, "callback", "()V");
    if (mid == 0)
        return;
    (*env)->CallVoidMethod(env, thiz, mid);
}

In your “HelloJni” (pls. find a better name ;-)) class, you can then call:

public void callback() {
    Log.d(TAG, "...");
    // Start notifications now.
}