R.styleable can not be resolved, why?

Question

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).

Solution 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>

Solution 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

Solution 3

In my case I had inadvertently done import android.R instead of import com.<mypackage>.R.

Replace <mypackage> with your package name (or just delete the current import and let Android Studio do the rest).

Solution 4

You can access your package level stylable like this

<yourpackagename>.R.styleable.name

Solution 5

I had an undefined styleable error showing in Android Studio, but then I noticed the build was successful. I did Invalidate Caches & Restart and the problem went away.
(It took me far too long to figure it out.)

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Comments

[Praveen Kumar Purushothaman]

possible duplicate of Android Hello, Gallery tutorial -- "R.styleable cannot be resolved"

[Alex.Marynovskyi]

If you still have problem with it - check which R you are using. You must use your project R class

[IgorGanapolsky]

This doesn't explain how you put R.styleable into attrs file.

[Jevon]

This is the answer that saved me. It should have more upvotes than that other answer with over 15 upvotes that isn't even an answer.

[JPM]

This should be the answer

[Sandeep Dixit]

file names like attrs.xml, resources.xml do not matter. All contain resource tags as root. Children of Resorce tag matter. All can be in a single, if you do not want to organize.