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I am new to android programming. I have a background in my layout file and some image buttons on top. When the orientation of the phone is changed, I dont want the background to change orientation, but I want the image buttons to rotate appropriately. What is the best way to get this functionality?
Also I want to know the resolution of the images for the background for hdpi, mdpi and ldpi. Does it matter if I keep the same pixel size for each of them?
You can read about rotation here: http://developer.android.com/resources/articles/faster-screen-orientation-change.html
There is variety of different resolution for hdpi, mdpi and ldpi. http://developer.android.com/resources/dashboard/screens.html – here you can see what sizes and densities are the most popular. However, you can create layout specially for resolution you need (i.e. several layout for hdpi devices with different resolutions). The most popular resolutions are 320×480, 800×480, 854×480 (often I use the same layout as for 800×480).
You can read about supporting multiple screens here: http://developer.android.com/guide/practices/screens_support.html