[android-developers] Setting the dimensions of a bitmap for a live wallpaper

I'm creating a live wallpaper and I'm kinda confused about how I should set the dimensions of the bitmap. Consider that my wallpaper sets a background, I want that to behave as a regular wallpaper with parallax scrolling. So I set the width and height of the bitmap as what I get from getDesiredMinimumWidth() and getDesiredMinimumHeight() and I have the same dimensions in both portrait and landscape modes and then just center the image. But then sometimes getDesiredMinimumWidth() and getDesiredMinimumHeight() return -1. The documentation says that in such a situation I should use the display's width. I could do that but I won't have scrolling then. To fix that, I could just double the bitmap's width but then in portrait & landscape modes I would get different dimensions. Is what I'm doing the correct approach or should I be doing it differently? How do you guys do it?

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