Android Emulator (in Eclipse)

• can take a while to load (minutes)....don't turn off....Eclispe will let you load code changes with currently running emulator
• When the emulator is done loading it may ask you to press Menu to unlock, do so by pressing menu just under the screen. Sometimes it doesn't ask ...and you have to do it to see your app.

Android Projects / Code

• java based
• Output : when compile the result will be an .APK file (located in project / bin directory) which is the actual program binary of your application. However, the .APK file your compiler creates can only be used with the emulator on your desktop PC or Mac. You cannot use the same .APK file to install and run your app on your Android phone......YOU MUST FIRST sign your application...herefore, each and every application needs to be signed with a valid certificate that ensures where the application comes from. Meaning: the developer (you!) signs the application with his/her certificate to make sure it is always traceable where the application comes from. See http://developer.android.com/guide/publishing/app-signing.html for details