[英]How to inject app: Context in ViewModel with Hilt?
Hello, I'm trying to inject view model using Hilt, but I get the following error:您好,我正在尝试使用 Hilt 注入视图 model,但出现以下错误:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.wordssample, PID: 25250
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.wordssample/com.example.wordssample.MainActivity}: java.lang.RuntimeException: Cannot create an instance of class com.example.wordssample.MainViewModel
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2426)
Caused by: java.lang.RuntimeException: Cannot create an instance of class com.example.wordssample.MainViewModel
at androidx.lifecycle.ViewModelProvider$NewInstanceFactory.create(ViewModelProvider.java:221)
at androidx.lifecycle.ViewModelProvider$AndroidViewModelFactory.create(ViewModelProvider.java:278)
at androidx.lifecycle.SavedStateViewModelFactory.create(SavedStateViewModelFactory.java:106)
at androidx.hilt.lifecycle.HiltViewModelFactory.create(HiltViewModelFactory.java:74)
at androidx.lifecycle.AbstractSavedStateViewModelFactory.create(AbstractSavedStateViewModelFactory.java:69)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
This is my MainActivity:这是我的主要活动:
@AndroidEntryPoint
class MainActivity : AppCompatActivity() {
private val viewModel by viewModels<MainViewModel>()
override fun onCreate(savedInstanceState: Bundle?) {
....
And this is the ViewModel class I'm trying to inject这是我试图注入的 ViewModel class
class MainViewModel @ViewModelInject constructor(
@ApplicationContext application: Context,
@Assisted private val savedStateHandle: SavedStateHandle
) : ViewModel() {
private val repositorio = WordRepositorio(application)
val allWords = repositorio.mAllWords
...
I appreciate the help!感谢您的帮助! Thanks
谢谢
Yes, there was nothing wrong with the code.是的,代码没有任何问题。 The problem was in some libraries, apparently I was missing something.
问题出在某些图书馆中,显然我遗漏了一些东西。
I solved it by adding:我通过添加解决了它:
implementation 'com.google.dagger:hilt-android:2.28-alpha'
implementation 'androidx.hilt:hilt-lifecycle-viewmodel:1.0.0-alpha02'
kapt 'androidx.hilt:hilt-compiler:1.0.0-alpha02'
kapt 'com.google.dagger:hilt-android-compiler:2.28-alpha'
implementation 'androidx.navigation:navigation-fragment-ktx:2.3.0'
BaseViewModel基础视图模型
import android.app.Application
import androidx.lifecycle.AndroidViewModel
import dagger.hilt.android.lifecycle.HiltViewModel
import javax.inject.Inject
@HiltViewModel
open class BaseViewModel @Inject constructor(application: Application) : AndroidViewModel(application) {
protected val context
get() = getApplication<Application>()
}
HomeViewModel主页查看模型
@HiltViewModel
class HomeViewModel @Inject constructor(
application: Application,
private val userRepository: UserRepository
) : BaseViewModel(application) {
val text1 = MutableLiveData(context.getString(R.string.string_1))
fun update(){
text1.value = context.getString(R.string.string_2)
}
}
HomeFragment首页片段
@AndroidEntryPoint
class HomeFragment : Fragment(R.layout.home_fragment) {
private val binding: HomeFragmentBinding by dataBinding()
private val viewModel: HomeViewModel by viewModels()
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
binding.vm = viewModel
}
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