Intranet deployment for Android apps

Could someone give me some advice on how I can deploy the Android app remotely?

Things to take note are:

1).No access to android market (it will run on intranet)

2).About 300 devices

3).I don't want the user to do many steps to update the app.

If there is no easy way to do the deployment, I can do it manually(probably down load from Intran开发者_JAVA百科et website and manually run it) for the first time but for the subsequent updates, is there a way to update the application by itself?

I don't think there's anything in the standard device to do this; the Android Market client doesn't provide that kind of flexibility. You can certainly download and install .apk files through the browser (provided the server is offering them up with the right MIME type), but that doesn't solve your update problem.

The only approach I can think of is what Amazon did: write your own app management app. It could also run as a service that would periodically check for updates (or, better, receive push notifications of updates) and download and install them in the background. It's a lot of work, but probably fairly straightforward to do.