Type mismatch: inferred type is LoginActivity but LifecycleOwner was expected

It seems androidx.appcompat.app.AppCompatActivity doesn't implement LifecycleOwner interface in the version you are using androidx.appcompat:appcompat:1.0.2.

android.support.v7.app.AppCompatActivity implicitly implements LifecycleOwner, so you need to inherit from it instead of androidx.appcompat.app.AppCompatActivity:

class LoginActivity : android.support.v7.app.AppCompatActivity() { ... }

or use some other Activity class that implements (explicitly or implicitly) LifecycleOwner, e.g. android.support.v4.app.FragmentActivity.

Additionally, any custom application class can implement the LifecycleOwner interface. More info about LifecycleOwner is here.

If you are using androidx.appcompat:appcompat:1.0.2

It won't work for you as LifeCycleOwner is not implemented. Your AppCompatActivity extends FragmentActivity which further extends ComponentActivity and ComponentActivity implements LifeCycleOwner which is not in 1.0.2 version so upgrading (1.1.0-alpha02) or downgrading (1.0.0) will work for you.

Happy coding :)

I had the same issue and fix it with updating my support version to

versions.support = "1.1.0-alpha01"

so which means just update the

implementation 'androidx.appcompat:appcompat:1.1.0-alpha01'

and it should be fixed