Hilt - what is the Java equivalent to kotlin's "by viewmodels()" to inject viewmodel into activity?

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I'm following Kotlin tutorial on learning Dagger Hilt for dependency injection. The tutorial uses

class MainActivity: AppCompatActivity() {
    private val viewModel: TestViewModel by viewModels()
}

in the MainActivity to inject the viewmodel.

It requires a dependency: implementation "androidx.activity.activity-ktx:1.1.0" to do so.

I'm trying to learn hilt in Java so I'm unsure what the Java equivalent of injecting the viewmodel into my activity is.

This is incorrect and doesn't work

@Inject
private TestViewModel testViewModel;

and using

testViewModel = new ViewModelProvider(this).get(TestViewModel.class);

doesn't seem like dependency injection.

What is the equivalent of by viewModels() in Java?

dagger-hilt kotlin android
1 Answers

testViewModel = new ViewModelProvider(this).get(TestViewModel.class) is indeed exactly what by viewModels() does for you.

You'll note that both by viewModels() and new ViewModelProvder(this) don't pass in a custom ViewModelProvider.Factory instance - that's because they use the default Factory - the one setup by Hilt to correctly create your ViewModel via DI.

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