Android 使用资源中带有字符串数组的BindingAdapter

我有一个几乎很简单的想法：我想用数据绑定API和BindingAdapter为微调器生成一个适配器。以下是我要使用的XML：

<Spinner
    android:id="@+id/country"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:value="@{address.country}"
    app:data="@{@array/countries}"
    app:keys="@{@array/iso_3166_2}"/>

对于绑定，我编写了以下BindingAdapter：

@BindingAdapter({"value", "data", "keys"})
public static void generateAdapter(Spinner spinner,
                                   String value,
                                   @ArrayRes int data,
                                   @ArrayRes int keys) {

}

当我试图编译代码时，出现以下错误：

错误：任务“：app:compiledBugJavaWithJavaC”的执行失败。
java.lang.RuntimeException:发现数据绑定错误。
****/数据绑定错误****消息：标识符必须具有XML文件中的用户定义类型。国家缺少它
文件：path/to/the/spinner over.xml
loc:95:31-95:39
****\数据绑定错误****

我的xml的第95行是这一行：

app:value=“@{address.country}”

你知道我做错了什么吗？

---

顺便问一下，我不确定与数组资源相关的注释是否正确？我没有办法将它限制为字符串数组。

您可以通过引用

stringArray

而不是

array

来获得它。以下是我使用recyclerView所做的工作，以从资源中获取价值，它工作得非常完美，可能也会对您有所帮助

在string.xml中

<string-array name="myItems">
    <item>Item 1</item>
    <item>Item 2</item>
    <item>Item 3</item>
    <item>Item 4</item>
    <item>Item 5</item>
    <item>Item 6</item>
</string-array>

在您的情况下，它可以是

app:data=“@{@stringArray/countries}”

或

app:keys=“@{@stringArray/iso3166_2}”

在绑定方法中

@BindingAdapter({"entries"})
public static void entries(RecyclerView recyclerView, String[] array) {
    //get all values in array[] variable.
}

---

有关详细信息，请参阅。

如果要访问数据绑定布局文件中的其他资源类型，请参阅源代码

    public String toJava() {
        final String context = "getRoot().getContext()";
        final String viewName = requiresView() ? LayoutBinderWriterKt.getFieldName(mTarget) :
                "getRoot()";
        final String resources = viewName + ".getResources()";
        final String resourceName = mPackage + "R." + getResourceObject() + "." + mResourceId;
        if ("anim".equals(mResourceType)) return "android.view.animation.AnimationUtils.loadAnimation(" + context + ", " + resourceName + ")";
        if ("animator".equals(mResourceType)) return "android.animation.AnimatorInflater.loadAnimator(" + context + ", " + resourceName + ")";
        if ("bool".equals(mResourceType)) return resources + ".getBoolean(" + resourceName + ")";
        if ("color".equals(mResourceType)) return "android.databinding.DynamicUtil.getColorFromResource(" + viewName + ", " + resourceName + ")";
        if ("colorStateList".equals(mResourceType)) return "android.databinding.DynamicUtil.getColorStateListFromResource(" + viewName + ", " + resourceName + ")";
        if ("dimen".equals(mResourceType)) return resources + ".getDimension(" + resourceName + ")";
        if ("dimenOffset".equals(mResourceType)) return resources + ".getDimensionPixelOffset(" + resourceName + ")";
        if ("dimenSize".equals(mResourceType)) return resources + ".getDimensionPixelSize(" + resourceName + ")";
        if ("drawable".equals(mResourceType)) return "android.databinding.DynamicUtil.getDrawableFromResource(" + viewName + ", " + resourceName + ")";
        if ("fraction".equals(mResourceType)) {
            String base = getChildCode(0, "1");
            String pbase = getChildCode(1, "1");
            return resources + ".getFraction(" + resourceName + ", " + base + ", " + pbase +
                    ")";
        }
        if ("id".equals(mResourceType)) return resourceName;
        if ("intArray".equals(mResourceType)) return resources + ".getIntArray(" + resourceName + ")";
        if ("integer".equals(mResourceType)) return resources + ".getInteger(" + resourceName + ")";
        if ("interpolator".equals(mResourceType))  return "android.view.animation.AnimationUtils.loadInterpolator(" + context + ", " + resourceName + ")";
        if ("layout".equals(mResourceType)) return resourceName;
        if ("plurals".equals(mResourceType)) {
            if (getChildren().isEmpty()) {
                return resourceName;
            } else {
                return makeParameterCall(resources, resourceName, "getQuantityString");
            }
        }
        if ("stateListAnimator".equals(mResourceType)) return "android.animation.AnimatorInflater.loadStateListAnimator(" + context + ", " + resourceName + ")";
        if ("string".equals(mResourceType)) return makeParameterCall(resources, resourceName, "getString");
        if ("stringArray".equals(mResourceType)) return resources + ".getStringArray(" + resourceName + ")";
        if ("transition".equals(mResourceType)) return "android.transition.TransitionInflater.from(" + context + ").inflateTransition(" + resourceName + ")";
        if ("typedArray".equals(mResourceType)) return resources + ".obtainTypedArray(" + resourceName + ")";
        final String property = Character.toUpperCase(mResourceType.charAt(0)) +
                mResourceType.substring(1);
        return resources + ".get" + property + "(" + resourceName + ")";

    }

@BindingAdapter({"entries"})
public static void entries(RecyclerView recyclerView, String[] array) {
    //get all values in array[] variable.
}

    public String toJava() {
        final String context = "getRoot().getContext()";
        final String viewName = requiresView() ? LayoutBinderWriterKt.getFieldName(mTarget) :
                "getRoot()";
        final String resources = viewName + ".getResources()";
        final String resourceName = mPackage + "R." + getResourceObject() + "." + mResourceId;
        if ("anim".equals(mResourceType)) return "android.view.animation.AnimationUtils.loadAnimation(" + context + ", " + resourceName + ")";
        if ("animator".equals(mResourceType)) return "android.animation.AnimatorInflater.loadAnimator(" + context + ", " + resourceName + ")";
        if ("bool".equals(mResourceType)) return resources + ".getBoolean(" + resourceName + ")";
        if ("color".equals(mResourceType)) return "android.databinding.DynamicUtil.getColorFromResource(" + viewName + ", " + resourceName + ")";
        if ("colorStateList".equals(mResourceType)) return "android.databinding.DynamicUtil.getColorStateListFromResource(" + viewName + ", " + resourceName + ")";
        if ("dimen".equals(mResourceType)) return resources + ".getDimension(" + resourceName + ")";
        if ("dimenOffset".equals(mResourceType)) return resources + ".getDimensionPixelOffset(" + resourceName + ")";
        if ("dimenSize".equals(mResourceType)) return resources + ".getDimensionPixelSize(" + resourceName + ")";
        if ("drawable".equals(mResourceType)) return "android.databinding.DynamicUtil.getDrawableFromResource(" + viewName + ", " + resourceName + ")";
        if ("fraction".equals(mResourceType)) {
            String base = getChildCode(0, "1");
            String pbase = getChildCode(1, "1");
            return resources + ".getFraction(" + resourceName + ", " + base + ", " + pbase +
                    ")";
        }
        if ("id".equals(mResourceType)) return resourceName;
        if ("intArray".equals(mResourceType)) return resources + ".getIntArray(" + resourceName + ")";
        if ("integer".equals(mResourceType)) return resources + ".getInteger(" + resourceName + ")";
        if ("interpolator".equals(mResourceType))  return "android.view.animation.AnimationUtils.loadInterpolator(" + context + ", " + resourceName + ")";
        if ("layout".equals(mResourceType)) return resourceName;
        if ("plurals".equals(mResourceType)) {
            if (getChildren().isEmpty()) {
                return resourceName;
            } else {
                return makeParameterCall(resources, resourceName, "getQuantityString");
            }
        }
        if ("stateListAnimator".equals(mResourceType)) return "android.animation.AnimatorInflater.loadStateListAnimator(" + context + ", " + resourceName + ")";
        if ("string".equals(mResourceType)) return makeParameterCall(resources, resourceName, "getString");
        if ("stringArray".equals(mResourceType)) return resources + ".getStringArray(" + resourceName + ")";
        if ("transition".equals(mResourceType)) return "android.transition.TransitionInflater.from(" + context + ").inflateTransition(" + resourceName + ")";
        if ("typedArray".equals(mResourceType)) return resources + ".obtainTypedArray(" + resourceName + ")";
        final String property = Character.toUpperCase(mResourceType.charAt(0)) +
                mResourceType.substring(1);
        return resources + ".get" + property + "(" + resourceName + ")";

    }