关于 数据双向绑定 转换数据类型 出问题

[田雷雨]

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ActivityMainBinding binding = DataBindingUtil.setContentView(this,R.layout.activity_main);
        Config config = new Config();
        binding.setCfg(config);
    }

}

public class Config extends BaseObservable {
    public  ObservableInt stopTimeBegin = new ObservableInt();

    public Config() {
    }

    @InverseMethod("stringToi")
    public static String itoString(ObservableInt i) {
        return String.valueOf(i.get());
    }

    public static ObservableInt stringToi(String str) {
        return new ObservableInt(Integer.valueOf(str));
    }
}

<layout xmlns:android="http://schemas.android.com/apk/res/android">

<data>
<import type="com.wind.databinding.Config"/>
<variable
name="cfg"
type="com.wind.databinding.Config" />
</data>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">

<EditText
android:id="@+id/text"
android:layout_width="match_parent"
android:text='@={cfg.itoString(cfg.stopTimeBegin)}'
android:layout_height="match_parent">
</EditText>
</RelativeLayout>


</layout>

如何不做类型转换就没有怎么问题..

[田雷雨]

原因已明

cfg.itoString

应该是

Config.itoString