Magic with Merlin: Porter-Duff rules! Back in 1984, Thomas Porter and Tom Duff wrote a paper entitled "Compositing Digital Images" that described 12 rules combining two images.
Support for these compositing rules is found in the AlphaComposite class, first introduced in version 1.2 of the Java language. Version 1.4, currently in beta 2, supports all 12 rules. Bitmap quality, banding and dithering. Android 2.3 is finally out! I recently mentioned changes to default bitmaps and windows formats we made in Gingerbread and I would like to explain why these changes were made. I will also show you the difference between Android’s various bitmap formats and why you must use them carefully. Pivot Posts - Android Image Caching. Web development spoiled me.
Set the src tag on an img tag and away you go. For the most part, browsers just do the right thing and cache these requests. Disappointingly, Android does not come with out of the box support for caching content downloaded from the network.