is autoupdating possible in Android without using android market? [duplicate]

Answer 1

Check out the CWAC-Updater project: https://github.com/commonsguy/cwac-updater

Answer 2

Yes, you can use your own webservice for checking updates, and open link to new apk in browser. After downloading user can install new version.

Answer 3

If you don't want to maintain you own update server, you may try this: auto-update-apk.com

Android client is open-source under Apache 2.0 license, so you may see how it works and make any changes, if necessary, before incorporating into your own project or using it as a starting point of your project.