小编She*_*ler的帖子

嘿我想让我的ViewModel工作,但到目前为止没有运气.Android Studio显示错误Cannot resolve symbol 'ViewModelProviders'.

我在这个题目中找到的每个其他问题被修正extends Activity到extends AppCompatActivity,但我延长正确的.不确定我错过了什么...
我的代码基于此YouTube视频

MainActivity.java

public class MainActivity extends AppCompatActivity implements
    TileAdapter.TileAdapterOnClickHandler {


private BaseViewModel viewModel;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //set Toolbar
    Toolbar myToolbar = findViewById(R.id.toolbar);
    setSupportActionBar(myToolbar);


    //initialize viewModel
    viewModel = ViewModelProviders.of(this).get(BaseViewModel.class);

BaseViewModel.java

public class BaseViewModel extends ViewModel {

private Movie[] mMovie;

public void init (Movie[] movies){
    this.mMovie = movies;
}

public Movie[] getMovie() {
    return mMovie;
}