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zipalign tool not found in SDK - Eclipse

While exporting Android signed application package through Eclipse you get this warning
The zipalign tool was not found in the SDK.Please update to the latest SDK and re-export your application or run zipalign manually
After getting this warning I started looking for zipalign tool. After searching in SDK folder I found zipalign.exe under copy_tools folder. This folder is used by Android SDK update to keep copy of old tools.


What is zipalign tool ?


From Android documentation
zipalign is an archive alignment tool that provides important optimization to Android application (.apk) files. The purpose is to ensure that all uncompressed data starts with a particular alignment relative to the start of the file.

How to make Eclipse find this zipalign tool

To make eclipse use this zipalign.exe you have to copy it in a proper SDK folder. You can find SDK folder in
%android-sdk-path% / build_tools / {sdkfolder}
After copying zipalign.exe to this folder when you run Eclipse to sign your apk it will automatically run zipalign on apk. 
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