!!! Android development notes.

!! Reading closed binary apk's.

Unzipping most of your apk's on your device, you will find, that you cannot read even the {{AndroidManifest.xml}} file.\\
Well, use the [apktool|http://code.google.com/p/android-apktool/] to ''decompile'' it, and see if you can learn something from it.

Here's an example :
{{{
metskem@gneisenau:~/AndroidStuff/misc$ ./apktool d --no-src apps/aokp-5.2/nl.ns.android.activity-1.apk apps/decoded/ns
I: Copying raw classes.dex file...
I: Loading resource table...
I: Loaded.
I: Loading resource table from file: /home/metskem/apktool/framework/1.apk
I: Loaded.
I: Decoding file-resources...
I: Decoding values*/* XMLs...
I: Done.
I: Copying assets and libs...
}}}

!!

C2DM

C2DM, or Cloud to Device Messaging, can be used to send small messages from a server to an Android device, see [https://developers.google.com/android/c2dm/] for all details.
You could use it to tell an app to come and get updates or new data.