Spinner 2 way databinding

Question

我無法獲得2way數據綁定與微調工作。我出口在這裏我的Android Studio項目 - https://github.com/asatyana/Spinner2WayDataBinding

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這裏是我的活動佈局

<?xml version="1.0" encoding="utf-8"?> 
<layout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto"> 

    <data> 
     <variable 
      name="myModel" 
      type="com.example.spinner.model.SpinnerModel" /> 
    </data> 
    <RelativeLayout 
     xmlns:tools="http://schemas.android.com/tools" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:paddingBottom="@dimen/activity_vertical_margin" 
     android:paddingLeft="@dimen/activity_horizontal_margin" 
     android:paddingRight="@dimen/activity_horizontal_margin" 
     android:paddingTop="@dimen/activity_vertical_margin" 
     app:layout_behavior="@string/appbar_scrolling_view_behavior" 
     tools:context="com.example.spinner.MainActivity" 
     tools:showIn="@layout/activity_main"> 

     <Spinner 
      android:id="@+id/spinner" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:entries="@{myModel.countries}" 
      app:selection="@{myModel.countryIdx}"/> 

     <TextView 
      android:id="@+id/textView" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_above="@id/spinner" 
      android:text="@{myModel.country}" /> 
    </RelativeLayout> 
</layout> 

我的模型

public class SpinnerModel extends BaseObservable{ 

    private String [] countries; 
    private int countryIdx; 
    private String country; 


    public SpinnerModel() 
    { 
     List<String> allCountries = new ArrayList<String>(); 
     String[] locales = Locale.getISOCountries(); 

     for (String countryCode : locales) { 

      Locale obj = new Locale("", countryCode); 

      allCountries.add(obj.getDisplayCountry()); 

     } 

     countries = allCountries.toArray(new String[allCountries.size()]); 
    } 

    public String[] getCountries() { 
     return countries; 
    } 

    public void setCountries(String[] countries) { 
     this.countries = countries; 
    } 

    public int getCountryIdx() { 
     return countryIdx; 
    } 

    public void setCountryIdx(int countryIdx) { 
     this.countryIdx = countryIdx; 
    } 

    public String getCountry() { 
     return countries[countryIdx]; 
    } 

    public void setCountry(String country) { 
     this.country = country; 
    } 
} 

Answer 1

有在適配器中AS使用的錯別字2.1。你可以解決它：

@InverseBindingMethods({ 
    @InverseBindingMethod(type = Spinner.class, attribute = 「android:selectedItemPosition」), 
}) 

您可以在項目中應用此批註任何類。