I want to deploy my application on different screen sizes using the 1.6 feature. I exported the drawable resources with different resolutions in drawable-ldpi, drawable-mdpi
Try adding -v4 to your -ldpi, -mdpi, and -hdpi directory names, and having a base res/drawable/ for use by Android 1.5.
-v4
-ldpi
-mdpi
-hdpi
res/drawable/