无法使用ViewModelProviderFactory类创建androidviewmodel的实例

如何解决无法使用ViewModelProviderFactory类创建androidviewmodel的实例

我在创建扩展androidviewmodel的viewmodel实例时遇到问题。 错误在此行上（返回modelClass.getConstructor（）。newInstance（））。

这是视图模型：

class IdiomViewModel(application: Application): AndroidViewModel(application) {

    private val readAllData: LiveData<List<IdiomDB>>
    private val repository: IdiomRepository

    //the init block is execute first whe viewmodel is quote
   init {
        val idiomDao = IdiomDatabase.getDatabase(application).idiomDao()
        repository = IdiomRepository(idiomDao)
        readAllData = repository.readAllData
    }

    //is recommended to run database on the background thread
    // viewModelScope- part of coroutines
    fun insertIdiom(idiomDB: IdiomDB){
        viewModelScope.launch(Dispatchers.IO){
            repository.addIdiom(idiomDB)
        }
    }
}

这是ViewModelProviderFactory

        class ViewModelProviderFactory :
ViewModelProvider.Factory {

override fun <T : ViewModel?> create(modelClass: Class<T>): T {
    return modelClass.getConstructor().newInstance()
}

这是片段

    class IdiomFragment : Fragment(),IdiomAdapter.OnItemClickListener {
    
    private lateinit var groupContentRecView: RecyclerView
    private lateinit var adapter: IdiomAdapter
    private lateinit var viewModel: IdiomViewModel

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        //Can`t create instance of the viewmodel
        val viewModelProvider =ViewModelProviderFactory()
        viewModel = ViewModelProvider(requireActivity(),viewModelProvider).get(IdiomViewModel::class.java)
    }

    override fun onCreateView(
        inflater: LayoutInflater,container: ViewGroup?,savedInstanceState: Bundle?
    ): View {
        val binding = DataBindingUtil.inflate<FragmentIdiomBinding>(
            inflater,R.layout.fragment_idiom,container,false
        )

        binding.idiomViewModel = viewModel

        return binding.root
    }

这是个例外

    Process: com.example.americanidiomandphrases,PID: 18424
    java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:502)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
     Caused by: java.lang.reflect.InvocationTargetException
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930) 
     Caused by: java.lang.NoSuchMethodException: com.example.americanidiomandphrases.data.IdiomViewModel.<init> []
        at java.lang.Class.getConstructor0(Class.java:2332)
        at java.lang.Class.getConstructor(Class.java:1728)
        at com.example.americanidiomandphrases.viewmodels.ViewModelProviderFactory.create(ViewModelProviderFactory.kt:10)