Drawable-hdpi, Drawable-mdpi, Drawable-ldpi Android?

Here's a nice article about that http://developer.android.com/guide/practices/screens_support.html You'll find more details on 1.5 support in "Strategies for Legacy Apps" section.

To declare different layouts and bitmaps you'd like to use for different screens, you must place these alternative resources in separate directories/folders. This means that if you generate a 200x200 image for xhdpi devices, you should generate the same resource in 150x150 for hdpi, 100x100 for mdpi, and 75x75 for ldpi devices.

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