screen update

Hi I want to create a program that does something every time the screen is updated Like Show screen updates in Developer options ? ?? Thanks in advance for answering?

Despite not being a game, my app has several labels that gets updated several times a second: text is changed, visible and color attributes are changed, position and size are changed. How does Android handles redraws? When I set label.Text, it gets redrawn on screen. Does it get redrawn even if...