将BindingAdapter与资源中的字符串数组一起使用

时间:2016-04-27 20:10:40

标签: android arrays android-resources android-databinding

我有一个几乎简单的想法:我想为带有数据绑定API和BindingAdapter的微调器生成一个适配器。这是我想要使用的XML:

    bool flag = false;
    for(i=0;i<imax;i++)
    {   for(j=0;j<jmax(i);j++)
        {   for(c=0;c<cmax(j);c++)
            {   if(!check1(c))
                {    if(check2()) {flag=true;break;}// goes to ni
                     else break; //goes to nj
                }
            }
            if(flag){flag=false; break;}
            nj:;
        }
        // procedure
    ni:;
    }

这里的地址是一个简单的类,它有一个名为<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}"/> 的字段,它是一个字符串,将包含一个ISO-3166-2字符串。为了保持简单,价值观将是&#34; DE&#34;或&#34;美国&#34;。

这是我简化的 country

arrays.xml

对于绑定我写了这个BindingAdapter:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="iso_3166_2">
        <item>DE</item>
        <item>US</item>
    </string-array>

    <string-array name="countries">
        <item>@string/country_DE</item>
        <item>@string/country_US</item>
    </string-array>
</resources>

当我尝试编译代码时,我收到此错误:

  

错误:任务&#39;:app:compileDebugJavaWithJavac&#39;。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:路径/到/的/的旋above.xml
  当前:95:31-95:39
  **** \数据绑定错误****

我的xml的第95行是这一行:@BindingAdapter({"value", "data", "keys"}) public static void generateAdapter(Spinner spinner, String value, @ArrayRes int data, @ArrayRes int keys) { }

你看到我做错了吗?

顺便说一句,我不确定与数组资源相关的注释是否正确?我发现无法将其限制为字符串数组。

2 个答案:

答案 0 :(得分:7)

您可以通过引用stringArray代替array来获取它。以下是我使用recyclelerView从资源中获取价值的方法,它运作良好,也可能对您有所帮助。

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layout.xml中

app:entries="@{@stringArray/fi}"

在您的情况下,它可以是app:data="@{@stringArray/countries}"app:keys="@{@stringArray/iso_3166_2}"

和绑定方法

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

请参阅this了解更多信息。

答案 1 :(得分:0)

如果要访问数据绑定布局文件中的其他资源类型,请参见源代码

    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 + ")";

    }