Screen.javaAPI DocphoneME MR2 API (J2ME)3043Wed May 02 18:00:24 BST 2007javax.microedition.lcdui


public abstract class Screen extends Displayable
The common superclass of all high-level user interface classes. The contents displayed and their interaction with the user are defined by subclasses.

Using subclass-defined methods, the application may change the contents of a Screen object while it is shown to the user. If this occurs, and the Screen object is visible, the display will be updated automatically. That is, the implementation will refresh the display in a timely fashion without waiting for any further action by the application. For example, suppose a List object is currently displayed, and every element of the List is visible. If the application inserts a new element at the beginning of the List, it is displayed immediately, and the other elements will be rearranged appropriately. There is no need for the application to call another method to refresh the display.

It is recommended that applications change the contents of a Screen only while it is not visible (that is, while another Displayable is current). Changing the contents of a Screen while it is visible may result in performance problems on some devices, and it may also be confusing if the Screen's contents changes while the user is interacting with it.

In MIDP the four Screen methods that defined read/write ticker and title properties were moved to Displayable, Screen's superclass. The semantics of these methods have not changed.

MIDP 1.0

Fields Summary
Constructors Summary
Screen(String title)
Creates a new Screen object with the given title and with no ticker.

title the Screen's title, or null for no title

Methods Summary