android– 无法创建ViewModel类的实例(无法启动活动ComponentInfo)

概述我在我的项目中使用MVVM,Retrofit,LiveData但我在看到这些链接之前得到了这个错误>CannotcreateaninstanceofcustomViewModel>CannotcreateaninstanceofclassViewModel错误java.lang.RuntimeException:UnabletostartactivityComponentInfo{ir.orang

我在我的项目中使用MVVM,Retrofit,liveData但我在看到这些链接之前得到了这个错误

> @L_403_0@
> Cannot create an instance of class ViewModel

错误

java.lang.RuntimeException:       Unable to start activity ComponentInfo{ir.orangehat.movIEinfo/ir.orangehat.movIEinfo.application.home.HomeActivity}: java.lang.RuntimeException:Cannot create an instance of class ir.orangehat.movIEinfo.application.home.Homeviewmodel

这是我的viewmodel,我认为问题出在我的构造函数中

public class Homeviewmodel extends AndroIDviewmodel {private MovIERepository movIERepository;public Homeviewmodel(@NonNull Application application, Context context, lifecycleOwner lifecycleOwner) {    super(application);    movIERepository = new MovIERepository(lifecycleOwner, context);}liveData<List<MovIE>> getMovIEs() {    return movIERepository.getMovIEs();}}

知识库

public class MovIERepository extends BaseRepository {private lifecycleOwner lifecycleOwner;private MovIEAPI movIEAPI;private MovIEDatabaseHelper movIEDatabaseHelper;public MovIERepository(lifecycleOwner lifecycleOwner, Context context) {    this.lifecycleOwner = lifecycleOwner;    movIEAPI = getRetrofitHelper().getService(MovIEAPI.class);    movIEDatabaseHelper = new MovIEDatabaseHelper(context);}public liveData<List<MovIE>> getMovIEs() {    liveData<List<MovIE>> movIEsliveData = movIEAPI.getMovIEList();    movIEsliveData.observe(lifecycleOwner, new Observer<List<MovIE>>() {        @OverrIDe        public voID onChanged(@Nullable List<MovIE> movIEArrayList) {            movIEDatabaseHelper.Save(movIEArrayList);        }    });    return movIEDatabaseHelper.getAll();} }

活动类

public class HomeActivity extends AppCompatActivity {@OverrIDeprotected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_main);    // the error is here    Homeviewmodel homeviewmodel = viewmodelProvIDers.of(this).get(Homeviewmodel.class);    homeviewmodel.getMovIEs().observe(HomeActivity.this, new Observer<List<MovIE>>() {        @OverrIDe        public voID onChanged(@Nullable List<MovIE> movIEArrayList) {            String str = null;            if (movIEArrayList != null) {                str = Arrays.toString(movIEArrayList.toArray());            }            Log.e("movIEs", str);        }    });}

}

我应该在我的项目和定制工厂中使用Dagger吗？

解决方法:

引用the documentation for AndroidViewModel：

Subclasses must have a constructor which accepts Application as the only parameter.

您的构造函数不符合该要求.

或者：

>从Homeviewmodel中删除Context上下文和lifecycleOwner lifecycleOwner构造函数参数,或
>创建可以构建Homeviewmodel实例的a ViewModelProvider.Factory,并将该工厂与viewmodelProvIDers.of()一起使用

总结

以上是内存溢出为你收集整理的android – 无法创建ViewModel类的实例(无法启动活动ComponentInfo)全部内容，希望文章能够帮你解决android – 无法创建ViewModel类的实例(无法启动活动ComponentInfo)所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。