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I have been an Android user for more than 3 years already and I am used to enter into a screen (Activity), change some settings and press back. The changes are saved automatically.
Now I am devoping an app and I wanted to use the Discard | Done buttons in the ActionBar. This Activity is a settings Activity so the user changes some stuff and then presses Done. However now I am confused because what should I do if the users presses Back? Should I also save the setting or should I discard them?
To my mind, keep the “discard” button only, and save the setting when the back button is pressed.