jetpackcomposeviewModel()使用刀柄给出错误“没有零参数构造函数”
在我的项目中,compose viewModel() 方法在我使用刀柄时给出错误“没有零参数构造函数”。
@Composable
fun HomeScreen(homeViewModel: HomeViewModel = viewModel()) {
...
}
@HiltViewModel
class HomeViewModel @Inject constructor(private val repository: Repository) :
ViewModel() {
...
}
@Module
@InstallIn(ViewModelComponent::class)
abstract class DataModule {
@Binds
abstract fun bindRepository(
fakePuppyRepository: RepositoryImpl
): Repository
}
这些是我的依赖项
implementation 'androidx.core:core-ktx:1.3.2'
implementation 'androidx.appcompat:appcompat:1.2.0'
implementation 'com.google.android.material:material:1.3.0'
implementation "androidx.compose.ui:ui:$compose_version"
implementation "androidx.compose.material:material:$compose_version"
implementation "androidx.compose.ui:ui-tooling:$compose_version"
implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.3.0'
implementation 'androidx.activity:activity-compose:1.3.0-alpha03'
implementation "androidx.navigation:navigation-compose:1.0.0-alpha08"
implementation 'androidx.lifecycle:lifecycle-livedata-ktx:2.3.0'
implementation 'androidx.compose.runtime:runtime-livedata:1.0.0-beta01'
implementation "com.google.dagger:hilt-android:$hilt_version"
implementation 'androidx.hilt:hilt-lifecycle-viewmodel:1.0.0-alpha03'
kapt "com.google.dagger:hilt-compiler:$hilt_version"
kapt 'androidx.hilt:hilt-compiler:1.0.0-alpha03'
testImplementation 'junit:junit:4.13.2'
androidTestImplementation 'androidx.test.ext:junit:1.1.2'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
回答
根据您的依赖项,我怀疑您正在使用 NavController/NavHost。
添加此依赖项:androidx.hilt : hilt-navigation-compose:1.0.0-alpha01
现在在定义 NavController 的可组合中,按如下方式调用 HomeScreen:
import androidx.compose.runtime.Composable
import androidx.hilt.navigation.compose.hiltNavGraphViewModel
import androidx.navigation.compose.NavHost
import androidx.navigation.compose.composable
import androidx.navigation.compose.rememberNavController
...
@Composable
fun Main() {
val navController = rememberNavController()
NavHost(navController, startDestination = "home"){
composable("home") {
val model: HomeViewModel = hiltNavGraphViewModel(it)
HomeScreen(model)
}
}
}
...
hiltNavGraphViewModel(...)
也可以替换为viewModel(HiltViewModelFactory(LocalContext.current, backStackEntry))
(来自https://github.com/google/dagger/issues/2166#issuecomment-769162910)
- I removed `androidx.navigation:navigation-compose` from the project based on this answer and I cannot believe that was the problem the whole time ♂️
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