在Room ORM中执行查询操作将重新启动我的应用程序

@Dao
public interface UserDao {
    @Query("SELECT * FROM users")
    LiveData<List<User>> getUsers();
}

public class UserRepository {
    private UserDao userDao;
    private LiveData<List<User>> users;

    public UserRepository(Application application) {
        AppDatabase database = AppDatabase.getInstance(application);
        userDao = database.userDao();
        users = userDao.getUsers();
    }

    public LiveData<List<User>> getUsers() {
        return users;
    }
}

public class UserViewModel extends AndroidViewModel {
    private UserRepository userRepository;
    private LiveData<List<User>> users;

    public UserViewModel(Application application) {
        super(application);
        userRepository = new UserRepository(application);
        users = userRepository.getUsers();
    }

    public LiveData<List<User>> getUsers() {
        return users;
    }
}

public class MainActivity extends AppCompatActivity {
    private UserViewModel userViewModel;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        userViewModel = ViewModelProviders.of(this).get(UserViewModel.class);
        userViewModel.getUsers().observe(this, new Observer<List<User>>() {
            @Override
            public void onChanged(List<User> users) {
                // 更新UI
            }
        });
    }
}