Merge "Improve Exception message for adding private fragments"

            if (targetSdkVersion > Build.VERSION_CODES.N && (fragmentClass.isAnonymousClass()

                    || !Modifier.isPublic(modifiers)

                    || (fragmentClass.isMemberClass() && !Modifier.isStatic(modifiers)))) {

                throw new IllegalStateException("Fragment must be a public static class to be "

                        + "properly recreated on configuration change.");

                throw new IllegalStateException("Fragment " + fragmentClass.getCanonicalName()

                        + " must be a public static class to be  properly recreated from"

                        + " instance state.");

            }

        }

        fragment.mFragmentManager = mManager;