update of an android application

Could someone explain in technical details h开发者_如何学Goow an android application handles updates ? . What kind of information does the application usually needs to send to request an update , and what does it receives back ? .

Updates to applications themselves are handled centrally by the Market application. You upload your updated apk to the Market via the website, and your users will be prompted to upgrade over the next couple of days.

This is why it is very important to retain your .keystore file with which you sign your apps. If you don't have this signature, you cannot update your apps for security reasons.

Your application doesn't need to contain any update logic of its own.