When publishing an app or a custom ROM, you need to sign the .apk or .zip files with a certificate using a private key. The Android system uses the certificate to identify the author of an application and establish a trust relationship between applications.
XDA forum moderator andyharney posted an easy-to-use tool that will take a signed or unsigned .apk and re-sign it, or batch sign all .apk files placed in the input folder. The application includes the tools needed to create your own signature, with all the required Java files so there’s no need for a separate Java installation code.
If you find it useful please leave your comments to developer.
Originally posted by andyharney
Having decided to completely rewrite my previous Sign & Aligner tool, I have come to the stage where it is ready for testing.
Version 1.1 Released
Added JDK 7 Install Path To USER PATH – Temporary Change, USER PATH Restored On Closure
Added Detection Of JDK Installation
Sign with Test Keys
Sign with Private Keys
Generate Your Own Private Key
ZipAlign your APKs
You can generate your own set of Private Keys to sign your own APKs. The keys generated are fully compliant with current Android Market requirements.
Continue on to the application thread to find more.___________________