am ba1ae3af: am 42786418: Don\'t instantiate non-Fragments in Fragment.instantiate

            if (clazz == null) {

                // Class not found in the cache, see if it's real, and try to add it

                clazz = context.getClassLoader().loadClass(fname);

                if (!Fragment.class.isAssignableFrom(clazz)) {

                    throw new InstantiationException("Trying to instantiate a class " + fname

                        + " that is not a Fragment", new ClassCastException());

                }

                sClassMap.put(fname, clazz);

            }

            Fragment f = (Fragment)clazz.newInstance();