记fragment重叠 解决方案

@Override
public void onAttachFragment(Fragment fragment) {
    if (statisticsFragment == null && fragment instanceof StatisticsFragment)
        statisticsFragment = fragment;
    if (logFragment == null && fragment instanceof LogFragment)
        logFragment = fragment;
    if (lawCaseFragment == null && fragment instanceof LawCaseFragment)
        lawCaseFragment = fragment;
    if (personalFragment == null && fragment instanceof PersonalFragment)
        personalFragment = fragment;
}