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MID Profile: Class MIDlet
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javax.microedition.midlet</FONT>
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Class MIDlet</H2>
<PRE>
<A HREF="../../../java/lang/Object.html">java.lang.Object</A>
|
+--<B>javax.microedition.midlet.MIDlet</B>
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<DL>
<DT>public abstract class <B>MIDlet</B><DT>extends <A HREF="../../../java/lang/Object.html">Object</A></DL>
<P>
A <code>MIDlet</code> is a MID Profile application. The application must extend this class to allow the application management software to control the MIDlet and to be able to retrieve properties from the application descriptor and notify and request state changes. The methods of this class allow the application management software to create, start, pause, and destroy a MIDlet. A <code>MIDlet</code> is a set of classes designed to be run and controlled by the application management software via this interface. The states allow the application management software to manage the activities of multiple <CODE>MIDlets</CODE> within a runtime environment. It can select which <code>MIDlet</code>s are active at a given time by starting and pausing them individually. The application management software maintains the state of the <code>MIDlet</code> and invokes methods on the <code>MIDlet</code> to notify the MIDlet of change states. The <code>MIDlet</code> implements these methods to update its internal activities and resource usage as directed by the application management software. The <code>MIDlet</code> can initiate some state changes itself and notifies the application management software of those state changes by invoking the appropriate methods.<p> <strong>Note:</strong> The methods on this interface signal state changes. The state change is not considered complete until the state change method has returned. It is intended that these methods return quickly.<p>
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<CODE>protected </CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/midlet/MIDlet.html#MIDlet()">MIDlet</A></B>()</CODE>
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Protected constructor for subclasses.</TD>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/midlet/MIDlet.html#checkPermission(java.lang.String)">checkPermission</A></B>(<A HREF="../../../java/lang/String.html">String</A> permission)</CODE>
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Get the status of the specified permission.</TD>
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<CODE>protected abstract void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/midlet/MIDlet.html#destroyApp(boolean)">destroyApp</A></B>(boolean unconditional)</CODE>
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Signals the <code>MIDlet</code> to terminate and enter the <em>Destroyed</em> state.</TD>
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<CODE> <A HREF="../../../java/lang/String.html">String</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/midlet/MIDlet.html#getAppProperty(java.lang.String)">getAppProperty</A></B>(<A HREF="../../../java/lang/String.html">String</A> key)</CODE>
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Provides a <code>MIDlet</code> with a mechanism to retrieve named properties from the application management software.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/midlet/MIDlet.html#notifyDestroyed()">notifyDestroyed</A></B>()</CODE>
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Used by an <code>MIDlet</code> to notify the application management software that it has entered into the <em>Destroyed</em> state.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/midlet/MIDlet.html#notifyPaused()">notifyPaused</A></B>()</CODE>
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Notifies the application management software that the MIDlet does not want to be active and has entered the <em>Paused</em> state.</TD>
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<CODE>protected abstract void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/midlet/MIDlet.html#pauseApp()">pauseApp</A></B>()</CODE>
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Signals the <code>MIDlet</code> to enter the <em>Paused</em> state.</TD>
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<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/midlet/MIDlet.html#platformRequest(java.lang.String)">platformRequest</A></B>(<A HREF="../../../java/lang/String.html">String</A> URL)</CODE>
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Requests that the device handle (for example, display or install) the indicated URL.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/midlet/MIDlet.html#resumeRequest()">resumeRequest</A></B>()</CODE>
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Provides a <code>MIDlet</code> with a mechanism to indicate that it is interested in entering the <em>Active</em> state.</TD>
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<CODE>protected abstract void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/midlet/MIDlet.html#startApp()">startApp</A></B>()</CODE>
<BR>
Signals the <code>MIDlet</code> that it has entered the <em>Active</em> state.</TD>
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<TD><B>Methods inherited from class java.lang.<A HREF="../../../java/lang/Object.html">Object</A></B></TD>
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<TD><CODE><A HREF="../../../java/lang/Object.html#equals(java.lang.Object)">equals</A>, <A HREF="../../../java/lang/Object.html#getClass()">getClass</A>, <A HREF="../../../java/lang/Object.html#hashCode()">hashCode</A>, <A HREF="../../../java/lang/Object.html#notify()">notify</A>, <A HREF="../../../java/lang/Object.html#notifyAll()">notifyAll</A>, <A HREF="../../../java/lang/Object.html#toString()">toString</A>, <A HREF="../../../java/lang/Object.html#wait()">wait</A>, <A HREF="../../../java/lang/Object.html#wait(long)">wait</A>, <A HREF="../../../java/lang/Object.html#wait(long, int)">wait</A></CODE></TD>
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<A NAME="MIDlet()"><!-- --></A><H3>
MIDlet</H3>
<PRE>
protected <B>MIDlet</B>()</PRE>
<DL>
<DD>Protected constructor for subclasses. The application management software is responsible for creating MIDlets and creation of MIDlets is restricted. MIDlets should not attempt to create other MIDlets.<DD><DL>
<DT><B>Throws:</B><DD><CODE><A HREF="../../../java/lang/SecurityException.html">SecurityException</A></CODE> - unless the application management software is creating the MIDlet.</DL>
</DD>
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<A NAME="startApp()"><!-- --></A><H3>
startApp</H3>
<PRE>
protected abstract void <B>startApp</B>() throws <A HREF="../../../javax/microedition/midlet/MIDletStateChangeException.html">MIDletStateChangeException</A></PRE>
<DL>
<DD>Signals the <code>MIDlet</code> that it has entered the <em>Active</em> state. In the <em>Active</EM> state the <code>MIDlet</code> may hold resources. The method will only be called when the <code>MIDlet</code> is in the <em>Paused</em> state. <p> Two kinds of failures can prevent the service from starting, transient and non-transient. For transient failures the <code>MIDletStateChangeException</code> exception should be thrown. For non-transient failures the <code>notifyDestroyed</code> method should be called. <p> If a Runtime exception occurs during <code>startApp</code> the MIDlet will be destroyed immediately. Its <code>destroyApp</code> will be called allowing the MIDlet to cleanup.<DD><DL>
<DT><B>Throws:</B><DD><CODE><A HREF="../../../javax/microedition/midlet/MIDletStateChangeException.html">MIDletStateChangeException</A></CODE> - is thrown if the <code>MIDlet</code>⌨️ 快捷键说明
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