I dont think assets/ files are compressed all that great. For my app, I was able to cut down the size of overall apk by almost 50% by using GZipInputStream. I posted the numbers a while back.
But now I am paying the cost of decompression while loading those assets. I hope the Android platform can improve the compression of the apk file itself in a subsequent release. Thanks Inder On Wed, Feb 4, 2009 at 2:25 PM, Dianne Hackborn <[email protected]> wrote: > Oh btw there is one improvement we have in aapt for Cupcake to better > compress .png image files. > > On Wed, Feb 4, 2009 at 2:24 PM, Dianne Hackborn <[email protected]> wrote: >> >> Yep I think they are pretty compact in their current form. Note that the >> resource table itself is not stored compressed in the .apk, so that it can >> be mmapped into the process, which is a pretty important optimization for >> many cases. >> >> You can imagine doing some additional processing of the images to combine >> them into a few larger uber-images (we've done this kind of thing on >> previous platforms), but doing that well to the point where it is actually a >> win is not trivial, and it can easily lead to situations where you use way >> more memory than needed because you need to load the entire bitmap even >> though you only use a few things in it. Imagine something displaying the >> icons of all of the applications for example, loading a huge bitmap from >> each of the apps to pull out one little icon. >> >> If you want to work on further optimizing the data structures and code, >> we'd be happy to talk about it on android-framework and consider such >> patches. >> >> On Wed, Feb 4, 2009 at 10:06 AM, FranckLefevre <[email protected]> wrote: >>> >>> >>> Dear Raja, >>> >>> I think that compressing resources in APK would not be that convenient >>> for two reasons: >>> >>> 1- when resources are actual pictures, they are usually already >>> compressed (using GIF, JPG, PNG,...) and trying to ZIP them does not >>> significantly reduce their size >>> 2- APK resource files are offered through the framework (grep >>> "assets" in the source code...) that "maps" these APK files, allowing >>> to get a pointer to them. Compressing would lead to a buffer >>> duplication that may impact memory and speed. >>> >>> IMHO, this APK format is quite smart and convenient as it is... >>> >>> Rgds. >>> >>> Franck >>> >>> >>> >>> >>> >>> On Feb 3, 11:44 am, Raja Nagendra Kumar <[email protected]> >>> wrote: >>> > When we open up the .apk file in winzip (as it is a jar file), we see >>> > the classes are compressed and stored as one file. However the >>> > resources are taken as is. Would it not be a nice approach to compress >>> > all the resources (specially if all the application has many images) >>> > and store it as one file, as this could further bring down the .apk >>> > size. I understand it needs more runtime memory though.. Are there any >>> > options to pack the resources this way already.. >>> > >>> > As Android seems to run j2se.. I am assuming that such kind of runtime >>> > memory is not an issue. >>> > >>> > Regards, >>> > Raja Nagendra Kumar, >>> > C.T.Owww.tejasoft.com >>> >> >> >> >> -- >> Dianne Hackborn >> Android framework engineer >> [email protected] >> >> Note: please don't send private questions to me, as I don't have time to >> provide private support. All such questions should be posted on public >> forums, where I and others can see and answer them. >> > > > > -- > Dianne Hackborn > Android framework engineer > [email protected] > > Note: please don't send private questions to me, as I don't have time to > provide private support. All such questions should be posted on public > forums, where I and others can see and answer them. > > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
