If you are trying to create an instance of a ViewModel
in your Kotlin code and you are getting an error saying “cannot create an instance of class ViewModel”, it could be because you are trying to create an instance of the ViewModel
class directly, which is not possible.
To use a ViewModel
in your Android app, you need to use the Android ViewModel
library. This library provides a ViewModelProvider
class that you can use to create an instance of a ViewModel
class.
Here is an example of how you can create an instance of a ViewModel
class in Kotlin:
class MyActivity: AppCompatActivity() {
private lateinit var viewModel: MyViewModel
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
viewModel = ViewModelProvider(this).get(MyViewModel::class.java)
}
}
In this example, MyViewModel
is a class that extends the Android ViewModel
class and is responsible for storing and managing UI-related data in the activity.
To create an instance of MyViewModel
, you can use the ViewModelProvider
class and pass it the Activity
or Fragment
instance as a parameter. Then, you can call the get()
method on the ViewModelProvider
object and pass it the MyViewModel
class as a parameter to create an instance of the MyViewModel
class.
I hope this helps! Let me know if you have any more questions.