Possible Duplicate:
Is there a way to automatically update application on Android?
As a property of an application(NOT USING GOOGLE PLAY), an auto-updating possible in android? I mean can a application check and download the new apk file, and install after downloading it?
Check out the CWAC-Updater project: https://github.com/commonsguy/cwac-updater
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.
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.
来源：https://stackoverflow.com/questions/9930562/is-autoupdating-possible-in-android-without-using-android-market