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Using Ecipse it simple and easy to sign and gen your APK file.

Let us see basic steps from official Android web site...

Compile and sign with Eclipse ADT

If you are using Eclipse with the ADT plugin, you can use the Export Wizard to export a signed .apk (and even create a new keystore, if necessary). The Export Wizard performs all the interaction with the Keytool and Jarsigner for you, which allows you to sign the package using a GUI instead of performing the manual procedures to compile, sign, and align, as discussed above. Once the wizard has compiled and signed your package, it will also perfom package alignment with zipalign. Because the Export Wizard uses both Keytool and Jarsigner



To create a signed and aligned .apk in Eclipse:

1. Select the project in the Package Explorer and select File > Export.
2. Open the Android folder, select Export Android Application, and click Next. The Export Android Application wizard now starts, which will guide you through the process of signing your application, including steps for selecting the private key with which to sign the .apk (or creating a new keystore and private key).
3. Complete the Export Wizard and your application will be compiled, signed, aligned, and ready for distribution.