Android Efficient Bitmap processing

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http://stackoverflow.com – My scenario: In my activity, I have to show 2 galleries, 1 with large image and another is a thumbnail(same exactly like default Gallery application). My doubts: I am planning to save as 2 images(1 with large size and another one with thumbnail size) in sdcard for fast processing. Is that good practice? since it will increase the size. Or Shall I resize the large image during the getView method of BaseAdapter to small size for displaying in thumbnail gallery? Which one is the good practice? I don't want to slow down my app. (HowTos)