相关疑难解决方法(0)

何时使用MutableLiveData以及LiveData使用方法的范围：

MutableLiveData<User> getUser() {
    if (userMutableLiveData == null) {
        userMutableLiveData = new MutableLiveData<>();
    }
    return userMutableLiveData;
}

以及何时使用

LiveData<User> getUser() {
    if (userMutableLiveData == null) {
        userMutableLiveData = new MutableLiveData<>();
    }
    return userMutableLiveData
}