[android-developers] How to avoid window background to be redrawn ?

Hi !

I have implemented a custom view which behaves like a Spingboard (I have pages of icons scrolling). It works really good in smartphones. But now I am developping a tablet version and I have noticed a severe performance drop when scrolling. After investigation, it turns out that drawBitmap is faulty. It takes too long. If I remove my png background, everything is smooth again. But I don't wan't to get rid of this background. So I am wondering how I can void the whole screen to be repainted each time I am scrolling. In fact only a few portion of the screen needs to be redrawn. Why is all the screen repainted ? For instance, if you add a new view to the WindowManager and decides to move it changing its layout parameters, only this view and its surroundings are repainted. Why can't my view behave like this ?

Thanks

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