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I would like to hack around the Android default Settings app for prototyping purposes. What is the correct procedure for building and installing the “customized” app?
After I modify the Settings source in the platform source tree, how to I build it? After I build it, can I install Settings by itself, or do I rebuild and reinstall the entire Android platform image?
Here is an excellent article on compiling and replacing individual system apps: http://devtcg.blogspot.com/2009/03/building-running-and-debugging-android.html
In essence, you just make that one app and then copy the APK into /system/app.