midlet.java

来自「This is a resource based on j2me embedde」· Java 代码 · 共 384 行 · 第 1/2 页

     * <code>MIDlet</code> must cleanup and release all resources.  If
     * false the <code>MIDlet</code> may throw
     * <CODE>MIDletStateChangeException</CODE> to indicate it does not
     * want to be destroyed at this time.
     *
     * @exception MIDletStateChangeException is thrown
     *		if the <code>MIDlet</code> wishes to continue to
     *		execute (Not enter the <em>Destroyed</em> state).
     *          This exception is ignored if <code>unconditional</code>
     *          is equal to <code>true</code>.
     */
    protected abstract void destroyApp(boolean unconditional)
	throws MIDletStateChangeException;

    /**
     *
     * Used by an <code>MIDlet</code> to notify the application
     * management software that it has entered into the
     * <em>Destroyed</em> state.  The application management software
     * will not call the MIDlet's <code>destroyApp</code> method,
     * and all resources
     * held by the <code>MIDlet</code> will be considered eligible for
     * reclamation.
     * The <code>MIDlet</code> must have performed the same operations
     * (clean up, releasing of resources etc.) it would have if the
     * <code>MIDlet.destroyApp()</code> had been called.
     *
     */
    public final void notifyDestroyed() {
        peer.notifyDestroyed();
    }

    /**
     * Notifies the application management software that the MIDlet
     * does not want to be active and has
     * entered the <em>Paused</em> state.  Invoking this method will
     * have no effect if the <code>MIDlet</code> is destroyed, or if
     * it has not yet been started. <p>
     * It may be invoked by the <code>MIDlet</code> when it is
     * in the <em>Active</em> state. <p>
     *
     * If a <code>MIDlet</code> calls <code>notifyPaused()</code>, in the
     * future its <code>startApp()</code> method may be called make
     * it active again, or its <code>destroyApp()</code> method may be
     * called to request it to destroy itself. <p>
     *
     * If the application pauses itself it will need to call
     * <code>resumeRequest</code> to request to reenter the
     * <code>active</code> state.
     */
    public final void notifyPaused() {
        peer.notifyPaused();
    }

    /**
     * Provides a <code>MIDlet</code> with a mechanism to retrieve named
     * properties from the application management software.
     * The properties are retrieved from the combination of 
     * the application descriptor file and the manifest.
     * For trusted applications the values in the manifest MUST NOT
     * be overridden by those in the application descriptor. If they
     * differ, the MIDlet will not be installed on the device.
     * For untrusted applications, if an attribute
     * in the descriptor has the same name as an attribute in the
     * manifest the value from the descriptor is used and the value
     * from the manifest is ignored.
     *
     * @param key the name of the property
     * @return A string with the value of the property.
     * <code>null</code> is returned if no value is available for the
     * key.
     * @exception NullPointerException is thrown
     * if key is <code>null</code>.
     */
    public final String getAppProperty(String key) {
        return peer.getMIDletSuite().getProperty(key);
    }

    /**
     * Provides a <code>MIDlet</code> with a mechanism to indicate
     * that it is interested in entering the <em>Active</em>
     * state. Calls to this method can be used by the application
     * management software to determine which applications to move to
     * the <em>Active</em> state.  <p> When the application management
     * software decides to activate this application it will call the
     * <code>startApp</code> method.  <p> The application is generally
     * in the <em>Paused</em> state when this is called.  Even in the
     * paused state the application may handle asynchronous events
     * such as timers or callbacks.
     */
    public final void resumeRequest() {
        peer.resumeRequest();
    }

    /**
     * <p>Requests that the device handle (for example, display or
     * install) the indicated URL.</p>
     *
     * <p>If the platform has the appropriate capabilities and
     * resources available, it SHOULD bring the appropriate
     * application to the foreground and let the user interact with
     * the content, while keeping the MIDlet suite running in the
     * background. If the platform does not have appropriate
     * capabilities or resources available, it MAY wait to handle the
     * URL request until after the MIDlet suite exits. In this case,
     * when the requesting MIDlet suite exits, the platform MUST then
     * bring the appropriate application (if one exists) to the
     * foreground to let the user interact with the content.</p>
     *
     * <p>This is a non-blocking method. In addition, this method does
     * NOT queue multiple requests. On platforms where the MIDlet
     * suite must exit before the request is handled, the platform
     * MUST handle only the last request made. On platforms where the
     * MIDlet suite and the request can be handled concurrently, each
     * request that the MIDlet suite makes MUST be passed to the
     * platform software for handling in a timely fashion.</p>
     *
     * <p>If the URL specified refers to a MIDlet suite (either an
     * Application Descriptor or a JAR file), the application handling
     * the request MUST interpret it as a request to install the named
     * package. In this case, the platform's normal MIDlet suite
     * installation process SHOULD be used, and the user MUST be
     * allowed to control the process (including cancelling the
     * download and/or installation). If the MIDlet suite being
     * installed is an <em>update</em> of the currently running MIDlet
     * suite, the platform MUST first stop the currently running
     * MIDlet suite before performing the update. On some platforms,
     * the currently running MIDlet suite MAY need to be stopped
     * before any installations can occur.</p>
     *
     * <p>If the URL specified is of the form
     * <code>tel:&lt;number&gt;</code>, as specified in <a
     * href="http://www.ietf.org/rfc/rfc2806.txt">RFC2806</a>, then the
     * platform MUST interpret this as a request to initiate a voice
     * call. The request MUST be passed to the &quot;phone&quot;
     * application to handle if one is present in the platform. The
     * &quot;phone&quot; application, if present, MUST be able to set
     * up local and global phone calls and also perform DTMF post
     * dialing. Not all elements of RFC2806 need be implemented,
     * especially the area-specifier or any other requirement on the
     * terminal to know its context. The isdn-subaddress,
     * service-provider and future-extension may also be
     * ignored. Pauses during dialing are not relevant in some
     * telephony services.</p>
     *
     * <p>Devices MAY choose to support additional URL schemes beyond
     * the requirements listed above.</p>
     *
     * <p>Many of the ways this method will be used could have a
     * financial impact to the user (e.g. transferring data through a
     * wireless network, or initiating a voice call). Therefore the
     * platform MUST ask the user to explicitly acknowledge each
     * request before the action is taken. Implementation freedoms are
     * possible so that a pleasant user experience is retained. For
     * example, some platforms may put up a dialog for each request
     * asking the user for permission, while other platforms may
     * launch the appropriate application and populate the URL or
     * phone number fields, but not take the action until the user
     * explicitly clicks the load or dial buttons.</p>
     *
     * @return true if the MIDlet suite MUST first exit before the
     * content can be fetched.
     *
     * @param URL The URL for the platform to load. An empty string
     * (not null) cancels any pending requests.
     *
     * @exception javax.microedition.io.ConnectionNotFoundException if
     * the platform cannot handle the URL requested.
     *
     */
    public final boolean platformRequest(String URL)
            throws javax.microedition.io.ConnectionNotFoundException {
        return peer.platformRequest(URL);
    }

    /**
     * Get the status of the specified permission.
     * If no API on the device defines the specific permission
     * requested then it must be reported as denied.
     * If the status of the permission is not known because it might
     * require a user interaction then it should be reported as unknown.
     *
     * @param permission to check if denied, allowed, or unknown.
     * @return 0 if the permission is denied; 1 if the permission is allowed;
     * 	-1 if the status is unknown
     *
     */
    public final int checkPermission(String permission) {
        return peer.checkPermission(permission);
    }
}