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Zipalign Command (Step-By-Step)Navigate to your program files directory and open up android-sdk> build-tools > the build-tools version you have (27.0. 3 for me). At the bottom of that folder you should see your zipalign file.
zipalign is a zip archive alignment tool. It ensures that all uncompressed files in the archive are aligned relative to the start of the file. This allows those files to be accessed directly via mmap(2) , removing the need to copy this data in RAM and reducing your app's memory usage.
I had the same problem. And to fix it, I copy the Zipalign file from sdk/build-tools/android-4.4W folder to sdk/tools/
Edited: Since Google updated SDK for Android, new build-tools does fix this problem. So I encouraged everyone to update to Android SDK Build-tools 20 as suggested by Pang in the post below.
I fixed it by installing Android SDK Build-tools 20:
In Eclipse → Pull Down Menu → Window → Android SDK Manager, check Android SDK Build-tools Rev. 20, then click the Install n package(s)… button to start installing.
It becomes usable if you install
Android SDK Build-tools Rev.20
I decided to just make a video for this..I kept pasting it into tools but alas that was not working for me. I moved it to platform-tools and voila publishing right away..must restart eclipse afterwards.
Tutorial for fixing missing zipalign
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