It used to be that after making changes in my code, I could simply click run in netbeans and the updates would be evident in the android emulator. Now, for some reason, I have to click “Clean and build” first, then run. If I simply click run, the version from the most recent compile will be pushed the the emulator. I have no idea what changed.
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This sounds like a bug. Please file a bug against the plugin. There is a guide for this at http://www.nbandroid.org/p/contacts.html
It will be good to know plugin version, Android SDK version and NetBeans version. In addition to that you can take a look at the output from Ant verbose build to see if the .apk file deployed to emulator is really rebuilt (there is a button on the left bar of output window that leads you to a page where you can adjust Ant settings to print this verbose output).