Android app too heavy

can we delete android.jar from the signed apk file as explained by the开发者_高级运维 author here -

http://michaelpardo.com/2010/04/one-way-to-reduce-your-apk-file-size/

I want to be sure before trying. I have some 40 png files making my app very heavy. I also have some 20 music files which will make it even heavier. Any suggestion for compressing png and .mp3 files?

android.jar is not in your signed APK file. android.jar is a compile-time library. The equivalent Java classes already exist on devices.

Deleting android.jar can be a risk. For mp3 try converting them back using ImToo 3GP video convertor using lower rate. For png try some image compressor, such as Pngcrush.

This way you can reduce the size along with the safe side in hand.

:)