Keep in mind that turning on these developer settings may result in irregular device behavior.
USB debugging: Checkmark to turn on debug mode when USB is connected.
Development device ID: Displays the development device ID.
Stay awake: Checkmark to set the screen to never timeout while charging.
Allow mock locations: Checkmark to set the device to a mock location.
Desktop backup password: Checkmark to set a password to back up the desktop.
USER INTERFACE
Enable strict mode: Checkmark to flash the screen when applications operate for a long period of time on the main thread.
Show touch data: Checkmark to make touch data visible on the screen.
Show touches: Checkmark to show visual feedback when the screen is touched.
Show screen updates: Checkmark to flash areas of the screen when they are updated.
Show CPU usage: Checkmark to overlay the current CPU usage on the screen.
Force GPU rendering: Checkmark to use the 2D hardware acceleration in applications.
Window animation scale: Opens a dialog box to set the window animation scale.
Transition animation scale: Opens a dialog box to set the transition animation scale.
APPS
Don't keep activities: Checkmark to force stop every activity as soon as the user leaves it.
Background process limit: Opens a dialog box to set the background process limit.
Show all ANRs: Checkmark to show a dialog box when Applications running in the background are not responding.