AppCompatActivit를 상속하지 않은 class에서 findViewByID를 사용하고자 할때

HowToUseFindViewByIDExceptAppCompatActivit.java

public class A {
  public static void fillView(Activity activity) {
    TextView view = activity.findViewByID(R.id.view);
    view.setText('A');
  }
}

public class B extends AppCompatActivity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        A.fillView(this);      
  }
}