Hi, Use env->CallVoidMethod(obj, xyz); and not cls
obj can be obtained by jmethodID init = env->GetMethodID(gcls, "<init>","()V"); obj = env->NewGlobalRef(env->NewObject(cls, init)); Try this. This should work. On Tue, Dec 22, 2009 at 11:24 AM, Latha Shivanna <[email protected]> wrote: > Hi All > > > In my Android app, I need to call a non static java method from C/C++. > But i get a blunt crash when i do it using > GetMethodID/CallVoidMethod()1 methods. > > I have done like this: > > 1. Register the method using GetMethodID() as follows (mine is a cpp > file): > > jmethodID xyz = (env)->GetMethodID( cls, "showxyz", "()V"); > > > 2. And I call this method as follows: > > env->CallVoidMethod(cls, xyz); > > > 3. In java, my showxyz() is defined this way(this basically enables a > button which was disabled) > > void showxyz() > { > findViewById(R.id.btnPass).setEnabled(true); > } > > And this crashes. > > > But I have been using this method of calling Java funcs from C using a > set of GetStaticMethodID/CallStaticVoidMethod()(for nonstatic > methods) and that works always. > > But in this case, I have to call a non-static method and i get a crash. > > Can anybody please tel me where I am going wrong. I know this is a > basic JNI knowledge. But I am left high and dry. Please do advise. > > thanks > Latha > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected]<android-developers%[email protected]> > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
