25.2 Understanding Apply Changes Options

Android Studio provides three options in terms of applying changes to a running app in the form of Run App, Apply Changes and Restart Activity and Apply Code Changes. These options can be summarized as follows:

•Run App - Stops the currently running app and restarts it. If no changes have been made to the project since it was last launched, this option will simply restart the app. If, on the other hand, changes have been made to the project, Android Studio will rebuild and reinstall the app onto the device or emulator before launching it.

•Apply Code Changes - This option can be used when the only changes made to a project involve modifications to the body of existing methods or when a new class or method has been added. When selected, the changes will be applied to the running app without the need to restart either the app or the currently running activity. This mode cannot, however, be used when changes have been made to...