Question

我正在尝试获取特定片段的ViewModel类。但ViewModelProvider.of（this）.get（UserListViewModel.class）对我不起作用。从＆＃34; android.support.v4.app.Fragment＆＃34;扩展我的片段，但它仍然不起作用。这是代码

package mudasir.android.application.upfit.Fragments;


import android.arch.lifecycle.AndroidViewModel;
import android.arch.lifecycle.ViewModelProvider;
import android.databinding.DataBindingUtil;
import android.os.Bundle;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import mudasir.android.application.upfit.R;
import mudasir.android.application.upfit.ViewModel.UserListViewModel;
import mudasir.android.application.upfit.databinding.FragmentUserListBinding;

/**
 * A simple {@link Fragment} subclass.
 */
public class UserListFragment extends Fragment {

    UserListViewModel userListViewModel;
    FragmentUserListBinding fragmentUserListBinding;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        fragmentUserListBinding = DataBindingUtil.inflate(inflater, R.layout.fragment_user_list, container, false);
        View view = fragmentUserListBinding.getRoot();

        userListViewModel = ViewModelProvider.of(this).get(UserListViewModel.class);

        return view;
    }

}

Answer 1

您使用的是错误的课程。它应该是：

userListViewModel = ViewModelProviders.of(this).get(UserListViewModel.class);

请注意，它的 ViewModelProviders

无法使用ViewModelProvider

1 个答案: