servermidlet.java

功能更强的基于J2ME的蓝牙程序

package example.bluetooth.demo;
/*
 * DemoMIDlet.java
 *
 * Created on March 15, 2005, 1:07 PM
 */

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import java.util.Vector;

/**
 *
 * @author bohemius
 */
public class ServerMIDlet extends MIDlet implements javax.microedition.lcdui.CommandListener {
    
    private boolean[] published;
    private Vector imageNames;
    private Image onImage, offImage;
    private BTImageServer bt_server;
    
    /** Creates a new instance of DemoMIDlet */
    public ServerMIDlet() {
    }
    
    private void publishImageAction() {
        /*
         * Changing the state of base of published images
         */
        int index = get_ImageServerList().getSelectedIndex();
        
        if (published[index]==false) {
            published[index]=true;
            Image stateImg = true ? onImage : offImage;
            get_ImageServerList().set(index, get_ImageServerList().getString(index), stateImg);
            
// update bluetooth service information
            if (!bt_server.changeImageInfo(get_ImageServerList().getString(index),
                    published[index])) {
                
                // either a bad record or SDDB is buzy
                get_BlueToothAlert().setString("Can't update base");
                Display.getDisplay(this).setCurrent(get_BlueToothAlert(), this.get_ImageServerList());
                
                // restore internal information
                published[index] = !published[index];
                stateImg = published[index] ? onImage : offImage;
                get_ImageServerList().set(index, get_ImageServerList().getString(index), stateImg);
            }
        }
    }
    private void unpublishImageAction() {
        /*
         * Changing the state of base of published images
         */
        int index = get_ImageServerList().getSelectedIndex();
        
        if (published[index]==true) {
            published[index]=false;
            Image stateImg = false ? onImage : offImage;
            get_ImageServerList().set(index, get_ImageServerList().getString(index), stateImg);
            
// update bluetooth service information
            if (!bt_server.changeImageInfo(get_ImageServerList().getString(index),
                    published[index])) {
                
                // either a bad record or SDDB is buzy
                get_BlueToothAlert().setString("Can't update base");
                Display.getDisplay(this).setCurrent(get_BlueToothAlert(), this.get_ImageServerList());
                
                // restore internal information
                published[index] = !published[index];
                stateImg = published[index] ? onImage : offImage;
                get_ImageServerList().set(index, get_ImageServerList().getString(index), stateImg);
            }
        }
    }
    
    
// --- This section is auto-generated by NetBeans IDE. Do not modify or you may lose your changes.//<editor-fold defaultstate="collapsed" desc="This section is auto-generated by NetBeans IDE.">//GEN-BEGIN:MVDMethods
    /**
     * This method initializes UI of the application.
     */
    private void initialize() {
// For adding user code into this block, select "Design" item in the inspector and invoke property editor on Action property in Properties window.
        setupIndicatorImage();
        setupImageList();
        published=new boolean[get_ImageServerList().size()];
        javax.microedition.lcdui.Display.getDisplay(this).setCurrent(get_ImageServerList());
        bt_server = new BTImageServer(this);
    }
    
    /**
     * Called by the system to indicate that a command has been invoked on a particular displayable.
     * @param command the Command that ws invoked
     * @param displayable the Displayable on which the command was invoked
     **/
    public void commandAction(javax.microedition.lcdui.Command command, javax.microedition.lcdui.Displayable displayable) {
        if (displayable == ImageServerList) {
            if (command == addCommand) {
// For adding user code into this block, select "Design | Screens | ImageServerList [List] | Assigned Commands | addCommand" item in the inspector and invoke property editor on Action property in Properties window.
                publishImageAction();
            } else if (command == exitCommand) {
// For adding user code into this block, select "Design | Screens | ImageServerList [List] | Assigned Commands | exitCommand" item in the inspector and invoke property editor on Action property in Properties window.
                javax.microedition.lcdui.Display.getDisplay(this).setCurrent(null);
                destroyApp(true);
                notifyDestroyed();
            } else if (command == helpCommand) {
// For adding user code into this block, select "Design | Screens | ImageServerList [List] | Assigned Commands | helpCommand" item in the inspector and invoke property editor on Action property in Properties window.
                javax.microedition.lcdui.Display.getDisplay(this).setCurrent(get_helpScreen(), get_ImageServerList());
            } else if (command == removeCommand) {
// For adding user code into this block, select "Design | Screens | ImageServerList [List] | Assigned Commands | removeCommand" item in the inspector and invoke property editor on Action property in Properties window.
                unpublishImageAction();
            }
        }
    }
    
    /**
     * This method returns instance for ImageServerList component and should be called instead of accessing ImageServerList field directly.
     * @return Instance for ImageServerList component
     **/
    private javax.microedition.lcdui.List get_ImageServerList() {
        if (ImageServerList == null) {
            ImageServerList = new javax.microedition.lcdui.List("Configure Server", javax.microedition.lcdui.Choice.IMPLICIT, new java.lang.String[0], new javax.microedition.lcdui.Image[0]);
            ImageServerList.addCommand(get_addCommand());
            ImageServerList.addCommand(get_removeCommand());
            ImageServerList.addCommand(get_exitCommand());
            ImageServerList.addCommand(get_helpCommand());
            ImageServerList.setCommandListener(this);
            ImageServerList.setSelectedFlags(new boolean[0]);
        }
        return ImageServerList;
    }
    
    /**
     * This method returns instance for helpScreen component and should be called instead of accessing helpScreen field directly.
     * @return Instance for helpScreen component
     **/
    private javax.microedition.lcdui.Alert get_helpScreen() {
        if (helpScreen == null) {
            helpScreen = new javax.microedition.lcdui.Alert("Help", "The server is started by default. No images are published initially. Change this by corresponding commands - the changes take effect immediately. If image is removed from the published list, it can\'t be downloaded.", null, javax.microedition.lcdui.AlertType.INFO);
            helpScreen.setTimeout(-2);
        }
        return helpScreen;
    }
    
    /**
     * This method returns instance for addCommand component and should be called instead of accessing addCommand field directly.
     * @return Instance for addCommand component
     **/
    private javax.microedition.lcdui.Command get_addCommand() {
        if (addCommand == null) {
            addCommand = new javax.microedition.lcdui.Command("Publish Image", javax.microedition.lcdui.Command.SCREEN, 1);
        }
        return addCommand;
    }
    
    /**
     * This method returns instance for removeCommand component and should be called instead of accessing removeCommand field directly.
     * @return Instance for removeCommand component
     **/
    private javax.microedition.lcdui.Command get_removeCommand() {
        if (removeCommand == null) {
            removeCommand = new javax.microedition.lcdui.Command("Remove Image", javax.microedition.lcdui.Command.SCREEN, 1);
        }
        return removeCommand;
    }
    
    /**
     * This method returns instance for exitCommand component and should be called instead of accessing exitCommand field directly.
     * @return Instance for exitCommand component
     **/
    private javax.microedition.lcdui.Command get_exitCommand() {
        if (exitCommand == null) {
            exitCommand = new javax.microedition.lcdui.Command("Exit", javax.microedition.lcdui.Command.EXIT, 1);
        }
        return exitCommand;
    }
    
    /**
     * This method returns instance for helpCommand component and should be called instead of accessing helpCommand field directly.
     * @return Instance for helpCommand component
     **/
    private javax.microedition.lcdui.Command get_helpCommand() {
        if (helpCommand == null) {
            helpCommand = new javax.microedition.lcdui.Command("Help", javax.microedition.lcdui.Command.HELP, 1);
        }
        return helpCommand;
    }
    
    /**
     * This method returns instance for BlueToothAlert component and should be called instead of accessing BlueToothAlert field directly.
     * @return Instance for BlueToothAlert component
     **/
    private javax.microedition.lcdui.Alert get_BlueToothAlert() {
        if (BlueToothAlert == null) {
            BlueToothAlert = new javax.microedition.lcdui.Alert("Error", "", null, javax.microedition.lcdui.AlertType.ERROR);
            BlueToothAlert.setTimeout(3000);
            destroyApp(true);
            notifyDestroyed();
        }
        return BlueToothAlert;
    }
    
    javax.microedition.lcdui.List ImageServerList;
    javax.microedition.lcdui.Alert helpScreen;
    javax.microedition.lcdui.Command addCommand;
    javax.microedition.lcdui.Command removeCommand;
    javax.microedition.lcdui.Command exitCommand;
    javax.microedition.lcdui.Command helpCommand;
    javax.microedition.lcdui.Alert BlueToothAlert;
// --- This is the end of auto-generated section.//</editor-fold>//GEN-END:MVDMethods

/** Gets the image file name from its title (label). */
public String getImageFileName(String fname) {
    if (fname == null) {
        return null;
    }
    
    // no interface in List to get the index - should find
    int index = -1;
    
    for (int i = 0; i < get_ImageServerList().size(); i++) {
        if (get_ImageServerList().getString(i).equals(fname)) {
            index = i;
            break;
        }
    }
    
    // not found or not published
    if (index == -1 || !published[index]) {
        return null;
    }
    return (String) imageNames.elementAt(index);
}

/**
 * Gets the description of images from manifest and
 * prepares the list to contol the configuration.
 * <p>
 * The attributes are named "ImageTitle-n" and "ImageImage-n".
 * The value "n" must start at "1" and be incremented by 1.
 */
private void setupImageList() {
    imageNames = new Vector();
    get_ImageServerList().deleteAll();
    
    for (int n = 1; n < 100; n++) {
        String name = this.getAppProperty("ImageName-" + n);
        
        // no more images available
        if (name == null || name.length() == 0) {
            break;
        }
        String label = this.getAppProperty("ImageTitle-" + n);
        
        // no lable available - use picture name instead
        if (label == null || label.length() == 0) {
            label = name;
        }
        imageNames.addElement(name);
        get_ImageServerList().append(label, offImage);
    }
}

/**
 * Creates the image to idicate the base state.
 */
private void setupIndicatorImage() {
    
    // create "on" image
    try {
        onImage = Image.createImage("/images/st-on.png");
    } catch (java.io.IOException e) {
        
        // provide off-screen image then
        onImage = createIndicatorImage(12, 12, 0, 255, 0);
    }
    
    // create "off" image
    try {
        offImage = Image.createImage("/images/st-off.png");
    } catch (java.io.IOException e) {
        
        // provide off-screen image then
        offImage = createIndicatorImage(12, 12, 255, 0, 0);
    }
}

/**
 * Creates the off-screen image with specified size an color.
 */
private Image createIndicatorImage(int w, int h, int r, int g, int b) {
    Image res = Image.createImage(w, h);
    Graphics gc = res.getGraphics();
    gc.setColor(r, g, b);
    gc.fillRect(0, 0, w, h);
    return res;
}

/**
 * We have to provide this method due to "do not do network
 * operation in command listener method" restriction, which
 * is caused by crooked midp design.
 *
 * This method is called by BTImageServer after it is done
 * with bluetooth initialization and next screen is ready
 * to appear.
 */
public void completeInitialization(boolean isBTReady) {
    
    // bluetooth was initialized successfully.
    if (isBTReady) {
        Ticker t = new Ticker("Choose images you want to publish...");
        get_ImageServerList().setTicker(t);
        return;
    }
    
    // something wrong
    get_BlueToothAlert().setString("Can't inititialize bluetooth");
    Display.getDisplay(this).setCurrent(get_BlueToothAlert());
}

public void startApp() {
    initialize();
}

public void pauseApp() {
}

public void destroyApp(boolean unconditional) {
}

}