R.styleable can not be resolved, why?

问题

I have a resources.xml file located under direcotry values/ , That's

/values/resources.xml

<?xml version="1.0" encoding="utf-8"?> 
<resources> 
    <declare-styleable name="TheMissingTabWidget"> 
        <attr name="android:divider" /> 
    </declare-styleable> 
</resources>

In my java code, when I try to access this resource by R.styleable.TheMissingTabWidget , eclipse complain that styleable cannot be resolved or is not a field. Why? Why I can not access this resource? (I am using android 2.1-updated).

回答1:

plz make values/attrs.xml resources like this

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="**com.admob.android.ads.AdView**"><--- where u want to use
       <attr name="backgroundColor" format="color" />
       <attr name="TextColor" format="color" />
       <attr name="keywords" format="string" />
       <attr name="refreshInterval" format="integer" />
    </declare-styleable>
</resources>

回答2:

According to the SDK Release Notes,

The android.R.styleable class and its fields were removed from the public API, to better ensure forward-compatibility for applications. The constants declared in android.R.styleable were platform-specific and subject to arbitrary change across versions, so were not suitable for use by applications. You can still access the platform's styleable attributes from your resources or code. To do so, declare a custom resource element using a in your project's res/values/R.attrs file, then declare the attribute inside. For examples, see "sdk"/samples/ApiDemos/res/values/attrs.xml. For more information about custom resources, see Custom Layout Resources. Note that the android.R.styleable documentation is still provided in the SDK, but only as a reference of the platform's styleable attributes for the various elements.

Have a look to the ApiDemos code and the file res/values/attrs.xml