Screen unlocking method and device for mobile terminal

A computer-implemented method for unlocking a touch screen of a mobile terminal, the method comprising:

• at the mobile terminal having one or more processors, a gravity sensor and memory for storing program modules to be executed by the processors:
• providing an icon on the touch screen that indicates the mobile terminal is in a lock state;
• receiving an input event of a user on the touch screen, the input event comprising a rotating operation on the icon;
• detecting whether a rotating angle of the icon equals a unlocking angle preset in a storage system of the mobile terminal;
• and
• transitioning the mobile terminal from the lock state to an unlock state upon the condition that the rotating angle equals the unlocking angle;
• wherein when the rotating angle between a stop position and a start position of the icon does not reach the unlocking angle, the icon rebounds to a closer previous degree or rotates to a closer next degree in the form of animation, wherein the animation comprises acceleration effect generated from the gravity sensor.