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The Android application must give user option to set lock screen to pattern, password, or pin. They will have to set 3 different patterns/passwords/pins that is associated with the different colored background (red, green, blue). In order to unlock the phone, you would have to know the pattern, password,or pin number with the randomly generated colored background.
The locked screen: it should show date, time, weather, and a button for emergency calls.
The background color will change (random) each time the phone goes to sleep.
Lite free version will be colored background, no customization.
Premium version will be able to customize colored background and replace them with photos.
The concept is simple; modify the current single password screen lock, add 2 more passwords for the users to remember, randomize the unlock password, and allow users to customize background.