Touch input method, electronic device, system, and readable recording medium by using virtual keys

An electronic device, comprising:

• a touch screen;
• a memory device storing instructions;
• and
• one or more processors to execute the instructions to:
• calculating, when a first character graphic key displayed on the touch screen is touched, touch-area data so that a first character corresponding to the first character graphic key is inputted into the electronic device;
• and
• acquiring, when the touch-area data is varied, a shift amount and a shift direction of the touch-area data, wherein a second character corresponding to a second character graphic key which is located beside the first character graphic key is inputted into the electronic device when the shift amount reaches a threshold value.

A touch input system adapted for an electronic device, the electronic device having a touch screen, the touch input system comprising:

• a processing unit;
• a database group connecting with the processing unit and including a character database, a touch-area database, and a touch-area variation database, wherein the character database has a plurality of characters collected therein, the plurality of characters including a first character and a second character;
• at least one character graphic keyboard displayed on the touch screen as a virtual keyboard, the character graphic keyboard including a plurality of character graphic keys, the plurality of character graphic keys including a first character graphic key and a second character graphic key located beside the first character graphic key, wherein when a touch signal is generated to activate the first character graphic key, the processing unit inputs the first character into the electronic device accordingly;
• a touch-area calculating module, built in the processing unit, for calculating initial touch-area data according to the touch signal and recording the initial touch-area data in the touch-area database;
• a plurality of touch-area variation analysis modules, wherein, when the initial touch-area data is varied, one of the plurality of touch-area variation analysis modules detects touch-area expanding data in a first direction and records the touch-area expanding data in the touch-area variation database, and another one of the plurality of touch-area variation analysis modules detects a touch-area reduction data in a second direction and records the touch-area reduction data in the touch-area variation database, and wherein the first direction is toward a second character graphic key which is located beside the first character graphic key and opposite to the second direction;
• a control module, built in the processing unit, for acquiring a shift amount and a shift direction based on the touch-area expanding data and the touch-area reduction data, wherein the processing unit inputs the second character into the electronic device when the shift amount reaches a threshold value.