Mobile device and switching method of input method thereof

A mobile device comprising:

• a general camera module;
• a specific camera module;
• a barcode-decoding module electrically connected to the specific camera module, wherein the barcode-decoding module is configured to capture at least one barcode pattern through the specific camera module and convert the at least one barcode pattern into at least one first string, and each of the at least one barcode pattern is generated by using the specific camera module to capture at least one barcode;
• a touch display module configured to display a display frame, wherein the display frame has an input field;
• and
• a control module electrically connected to the general camera module, the specific camera module, and the touch display module, wherein the control module is configured to activate a trigger element of an image conversion input method in response to an input trigger event of the input field, the control module is configured to control the touch display module to display the input field and a first overlapping window which has a virtual keyboard of a system default input method on the display frame at the same time, the control module is configured to control the touch display module to switch the first overlapping window which is displayed to a second overlapping window in response to a first trigger event of the trigger element, and wherein the second overlapping window has a self-defined keyboard of the image conversion input method and a preview pane of the image conversion input method arranged in parallel;
• wherein, the self-defined keyboard and the preview pane are simultaneously displayed on the touch display module in response to that the first overlapping window is switched to the second overlapping window.