📄 screen.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN""http://www.w3.org/TR/REC-html40/frameset.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc on Fri Sep 27 14:47:31 CDT 2002 --><TITLE>Mobile Information Device Profile 2.0: Class Screen</TITLE><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../stylesheet.css" TITLE="Style"></HEAD><BODY BGCOLOR="white"><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_top"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/Screen.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM><strong>MIDP 2.0</strong></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../javax/microedition/lcdui/List.html"><B>PREV CLASS</B></A> <A HREF="../../../javax/microedition/lcdui/Spacer.html"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../index.html" TARGET="_top"><B>FRAMES</B></A> <A HREF="Screen.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | FIELD | CONSTR | <A HREF="#methods_inherited_from_class_javax.microedition.lcdui.Displayable">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | CONSTR | METHOD</FONT></TD></TR></TABLE><!-- =========== END OF NAVBAR =========== --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">javax.microedition.lcdui</FONT><BR>Class Screen</H2><PRE>java.lang.Object | +--<A HREF="../../../javax/microedition/lcdui/Displayable.html">javax.microedition.lcdui.Displayable</A> | +--<B>javax.microedition.lcdui.Screen</B></PRE><DL><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></DL><HR><DL><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><P><DL><DT><B>Since: </B><DD>MIDP 1.0</DD></DL><HR><P><!-- ======== INNER CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><!-- ======== CONSTRUCTOR SUMMARY ======== --><!-- ========== METHOD SUMMARY =========== --><A NAME="methods_inherited_from_class_javax.microedition.lcdui.Displayable"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from class javax.microedition.lcdui.<A HREF="../../../javax/microedition/lcdui/Displayable.html">Displayable</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><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></TR></TABLE> <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from class java.lang.Object</B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE>equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD></TR></TABLE> <P><!-- ============ FIELD DETAIL =========== --><!-- ========= CONSTRUCTOR DETAIL ======== --><!-- ============ METHOD DETAIL ========== --><!-- ========= END OF CLASS DATA ========= --><HR><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_bottom"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_bottom_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/Screen.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM><strong>MIDP 2.0</strong></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../javax/microedition/lcdui/List.html"><B>PREV CLASS</B></A> <A HREF="../../../javax/microedition/lcdui/Spacer.html"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../index.html" TARGET="_top"><B>FRAMES</B></A> <A HREF="Screen.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | FIELD | CONSTR | <A HREF="#methods_inherited_from_class_javax.microedition.lcdui.Displayable">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | CONSTR | METHOD</FONT></TD></TR></TABLE><!-- =========== END OF NAVBAR =========== --><HR><font size="-1"><a href="mailto:jsr-118-comments@jcp.org">Send a comment or suggestion</a> Version 2.0 of Mobile Information Device Profile Specification<br>Java is a trademark or registered trademark of Sun Microsystems, Inc. in the US and other countries. Copyright 1993-2002 Sun Microsystems, Inc. and Motorola, Inc. All Rights Reserved. 901 San Antonio Road, Palo Alto, California, 94303, U.S.A.</font></BODY></HTML>⌨️ 快捷键说明
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