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MID Profile: Class Screen
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SUMMARY: INNER | FIELD | CONSTR | <A HREF="#methods_inherited_from_class_javax.microedition.lcdui.Displayable">METHOD</A></FONT></TD>
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javax.microedition.lcdui</FONT>
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Class Screen</H2>
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<A HREF="../../../java/lang/Object.html">java.lang.Object</A>
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+--<A HREF="../../../javax/microedition/lcdui/Displayable.html">javax.microedition.lcdui.Displayable</A>
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+--<B>javax.microedition.lcdui.Screen</B>
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<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../javax/microedition/lcdui/Alert.html">Alert</A>, <A HREF="../../../javax/microedition/lcdui/Form.html">Form</A>, <A HREF="../../../javax/microedition/lcdui/List.html">List</A>, <A HREF="../../../javax/microedition/lcdui/TextBox.html">TextBox</A></DD>
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<DT>public abstract class <B>Screen</B><DT>extends <A HREF="../../../javax/microedition/lcdui/Displayable.html">Displayable</A></DL>
<P>
The common superclass of all high-level user interface classes. The contents displayed and their interaction with the user are defined by subclasses. <P>Using subclass-defined methods, the application may change the contents of a <code>Screen</code> object while it is shown to the user. If this occurs, and the <code>Screen</code> 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 <code>List</code> object is currently displayed, and every element of the <code>List</code> is visible. If the application inserts a new element at the beginning of the <code>List</code>, 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.</P> <P>It is recommended that applications change the contents of a <code>Screen</code> only while it is not visible (that is, while another <code>Displayable</code> is current). Changing the contents of a <code>Screen</code> while it is visible may result in performance problems on some devices, and it may also be confusing if the <code>Screen's</code> contents changes while the user is interacting with it.</P> <P>In MIDP 2.0 the four <code>Screen</code> methods that defined read/write ticker and title properties were moved to <code>Displayable</code>, <code>Screen's</code> superclass. The semantics of these methods have not changed.</P>
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<DT><B>Since: </B><DD>MIDP 1.0</DD>
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<TD><B>Methods inherited from class javax.microedition.lcdui.<A HREF="../../../javax/microedition/lcdui/Displayable.html">Displayable</A></B></TD>
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<TD><CODE><A HREF="../../../javax/microedition/lcdui/Displayable.html#addCommand(javax.microedition.lcdui.Command)">addCommand</A>, <A HREF="../../../javax/microedition/lcdui/Displayable.html#getHeight()">getHeight</A>, <A HREF="../../../javax/microedition/lcdui/Displayable.html#getTicker()">getTicker</A>, <A HREF="../../../javax/microedition/lcdui/Displayable.html#getTitle()">getTitle</A>, <A HREF="../../../javax/microedition/lcdui/Displayable.html#getWidth()">getWidth</A>, <A HREF="../../../javax/microedition/lcdui/Displayable.html#isShown()">isShown</A>, <A HREF="../../../javax/microedition/lcdui/Displayable.html#removeCommand(javax.microedition.lcdui.Command)">removeCommand</A>, <A HREF="../../../javax/microedition/lcdui/Displayable.html#setCommandListener(javax.microedition.lcdui.CommandListener)">setCommandListener</A>, <A HREF="../../../javax/microedition/lcdui/Displayable.html#setTicker(javax.microedition.lcdui.Ticker)">setTicker</A>, <A HREF="../../../javax/microedition/lcdui/Displayable.html#setTitle(java.lang.String)">setTitle</A>, <A HREF="../../../javax/microedition/lcdui/Displayable.html#sizeChanged(int, int)">sizeChanged</A></CODE></TD>
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<font size="-1"><a href="mailto:midp-feedback@risc.sps.mot.com">Submit a comment or suggestion</a> Version 2.0 of MID Profile Specification<br>Java is a trademark or registered trademark of Sun Microsystems, Inc. in the US and other countries. Copyright (c) 1993-2002 Sun Microsystems, Inc. 901 San Antonio Road,Palo Alto, California, 94303, U.S.A. All Rights Reserved.</font>
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