android: upgrade system app under /system/app programmatically
<p>I have an app which is built with the android image, so it's under /system/app directory. I also want to upgrade the app later. I should first download the new version app on the android device, and then install it. Because it's a system app, the normal install of new version only created a app under /data/app, without overwriting the old one under /system/app. How can I upgrade the system app under /system/app programmatically?</p>
