Frame drawing method, frame updating method and associated mobile electronic device

An electronic device, configured to display a frame, the electronic device comprising a user interface, the frame corresponding to a first region of the user interface, the electronic device comprising:

• a memory, configured to store an image of a second region of the user interface, wherein the second region comprises the first region;
• a receiving unit, configured to receive a movement command;
• and
• a processing unit, configured to fetch an image of the first region from the memory according to the first region to generate the frame, to perform a movement on the first region in the user interface according to the movement command, to determine whether the moved first region exceeds the second region, and to update the image of the second region in the memory when the moved first region exceeds the second region.

A frame drawing method, applied for drawing a frame of an electronic device, the frame comprising an image region and an icon, the icon being associated with a status of an application program of the electronic device, the image region comprising the icon, the frame drawing method comprising:

• drawing an image of the icon, and storing the image of the icon into a memory;
• updating the image of the icon according to the status of the application program;
• storing the updated image of the icon into the memory;
• and
• drawing the icon by the updated image of the icon in the memory when drawing the image region.