在屏幕上，绘制一个无焦点，未选中的按钮。当触摸按钮时，蜂鸣器响一声，并绘制有焦点，下压的按钮；当触摸非按钮区时，绘制一个无焦点，未选中的按钮。-On the screen, draw a no focus, the button is not selected. When the touch of a button, the buzzer sounds, and draw has focus, under the pressure of the button when you touch a