Android: ScrollView and drawing cache?

Are the views that get scrolled o开发者_StackOverflowff of ScrollView automatically cached by the drawing cache? I'm not quite sure i understand the API documentation.

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int PERSISTENT_ALL_CACHES Used to indicate that all drawing caches should be kept in memory.

int PERSISTENT_ANIMATION_CACHE Used to indicate that the animation drawing cache should be kept in memory.

int PERSISTENT_NO_CACHE Used to indicate that no drawing cache should be kept in memory.

int PERSISTENT_SCROLLING_CACHE Used to indicate that the scrolling drawing cache should be kept in memory.

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Use these in

public void setPersistentDrawingCache (int drawingCacheToKeep) 

which indicates what types of drawing caches should be kept in memory after they have been created.

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Example

 setPersistentDrawingCache(ViewGroup.PERSISTENT_SCROLLING_CACHE);
 setAlwaysDrawnWithCacheEnabled(true); // call this method 
 //to start (true) and stop (false) using the drawing cache
 //when you perform performance sensitive operations, like scrolling or animating.