3

MainActivity.java

public class MainActivity extends Activity {

    @Inject
    Presenter presenter;

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        MyApplication.getInstance().getAccountComponent("old account").inject(this);
        presenter.startLoading();
        /////
        changeAccountButton.setOnClickListener(() -> {
            presenter.clearView();
            MyApplication.getInstance().resetAccountComponent();
            MyApplication.getInstance().getAccountComponent("new account").inject(this);
            presenter.startLoading();
        });
    }

}