Scrolling in Android

In my project I want to use 开发者_JAVA百科scrolling for rendering the pdf in landscape mode. I have used onscroll method in Android, but when I run the application on a Samsung Galaxy device the scrolling is not smooth. Can anybody suggest how to get fine and smooth scrolling, and are there any methods other than onscroll?

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To get smooth scrolling of a complex image, try caching it to an offscreen bitmap. The trick to minimize memory usage is to only cache a little bit beyond the visible view bounds, and regenerate the cache as the user scrolls.

For sample code, see https://github.com/ldo/view_cache_demo_android