super.onCreate（savedInstanceState）;不会立即调用父类的onCreate（）方法。为什么？

Question

我从BaseClass扩展了我的所有活动。因此，我想在BaseActivity类的onCreate（）中初始化公共变量。但是，super.onCreate（savedInstanceState）;不会立即调用父类的onCreate（）方法。为什么？

public class SplashActivity extends BaseActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);     // after this line executed, next line executed rather than the onCreate() of parent BaseActivity
        ...
    }
}

public class BaseActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState, @Nullable PersistableBundle persistentState) {
        ...
    }
}