Adjusting Imageview size in the ImageGallery(thumbnail scroller) according to Screen Size

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http://stackoverflow.com – I have the Image Gallery with Small image as thumbnails , currently i have fixed the size of the image in ImageAdapter Class and its visible perfectly in small screens 240 x 320 and 320 x 480 . But Image are displayed small in large screen Like in Tablets or in Galaxy, So how should i change the imageview size according to the screen resolution . Thanks (HowTos)