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java.lang.Object | +--javax.microedition.lcdui.Displayable | +--javax.microedition.lcdui.Screen
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 2.0 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.
Methods inherited from class javax.microedition.lcdui.Displayable |
addCommand, getHeight, getTicker, getTitle, getWidth, isShown, removeCommand, setCommandListener, setTicker, setTitle, sizeChanged |
Methods inherited from class java.lang.Object |
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
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