Handheld devices and related data transmission methods

A data transmission method for use in a handheld device, wherein the handheld device at least comprises a touch-sensitive display unit, comprising:

• detecting an edge movement touch on the touch-sensitive display unit, wherein the edge movement touch is generated by first detecting that an object has contacted a point which is inside of the touch-sensitive display unit and has been dragged to an edge of the touch-sensitive display unit;
• when detecting the edge movement touch, generating first information according to the edge movement touch;
• and
• determining whether to transmit a file according to a comparison result of the first information and second information generated on an electronic device that is located neighboring to the handheld device;
• wherein the file is transmitted to the electronic device when the comparison result matches a predetermined condition.