[PersistenceMigrationsSample]username is not shown

[wangweiqi-synu]

    private UpdateUserCallback createUpdateUserCallback() {
        return user -> {
            Log.d("GZL", "mView = " + mView);
            if (mView != null) {
                mView.showUserName(user.getUserName());
            }
        };
    }

There is a chance that mView is null when I ran the application, but I do not figure out why and how to fix it.

One finding is that I attached the process and mView is null.

[thewyp]

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