Question

I am implementing my own custom DialogPreference subclass, like so:

public class MyCustomPreference extends DialogPreference
{
    private static final String androidns = "http://schemas.android.com/apk/res/android";

    private String mDialogMsg;

    public MyCustomPreference(Context context, AttributeSet attrs)
    {
        super(context, attrs);

        mDialogMsg = attrs.getAttributeValue(androidns, "dialogMessage");

        ...
    }

    ...
}

As you can see, I get the dialogMessage XML attribute and save it in the member variable mDialogMsg.

My problem is: my current code does not allow for the dialogMessage XML attribute to be specified as a string resource id in the XML.

In other words, this works:

android:dialogMessage="Hello world!"

But this doesn’t:

android:dialogMessage="@string/hello_world"

If I specify it as a resource id in the XML, the resource id gets saved to mDialogMsg, not the string resource itself. Now, I know I could do:

context.getString(attrs.getAttributeValue(androidns, "dialogMessage"))

But then the user would not be able to enter a normal string in the XML (i.e. a non-resource id). I want to give the user the option of doing both. How do I do this?

Answer 1

int resId = attrs.getAttributeResourceValue(androidns, "dialogMessage", 0);
if(resId != 0){
    mDialogMsg = getContext().getResources().getString(resId);
} else{
    mDialogMsg = attrs.getAttributeValue(androidns, "dialogMessage");
}