Pressing the Setting Button from the ActionBar will open the Settings screen.
This button is still present on the ActionBar inside the Settings screen allowing the user to open multiple Settings screens, one on top of another.
This flow is bad for user experience and it will crash the app at some point, when it gets out of memory.
When the user is on the Settings screen the Settings button should disappear, leaving the user with one possibility: to go back to the main screen.
Pressing the Setting Button from the ActionBar will open the Settings screen. This button is still present on the ActionBar inside the Settings screen allowing the user to open multiple Settings screens, one on top of another.
This flow is bad for user experience and it will crash the app at some point, when it gets out of memory.
When the user is on the Settings screen the Settings button should disappear, leaving the user with one possibility: to go back to the main screen.