BaseActivity.java

public abstract class BaseActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        if (requestInjection()){
            inject();
        }
    }

    private void inject() {
        ObjectGraph appGraph = Injector.obtain(getApplication());
        appGraph.inject(this);
    }
    
    abstract boolean requestInjection();
}

SomeActivity.java

public class SomeActivity extends BaseActivity {
    
    @Inject ApiService apiService;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.some_layout);
    }

    @Override
    boolean requestInjection() {
        return true;
    }
}

Compile error:
Caused by: java.lang.IllegalArgumentException: No inject registered for members/com.example.SomeActivity. You must explicitly add it to the 'injects' option in one of your modules.

Solution: Add SomeActivity.class to the module