Android: what does this Paint flag do: DEV_KERN_TEXT_FLAG?

I cannot find anything informative about the purp开发者_如何学Goose of this flag. Does anyone know?

Thank you

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Kerning is a typographical technique.

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From the docs (http://developer.android.com/reference/android/graphics/Paint.html):

An integer bit mask for the flag enabling device kerning for text.

(or does that not count as something informative?)