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My First FX Bluetooth App

Hey! Today I felt a desire to create something with JavaFX Script and Bluetooth. If you are not familiar with JavaFX, JavaFX Script and so on, take a look in a new and very good Joshua Marinacci's post about it.

I have created an application that allows you to inquiry for devices that are with Bluetooth turned on. It is pretty simple in terms of UI (user interface) and functionality, but the goal here is to show a little of JavaFX Script working with Java.

Here is what you need in this tutorial:

• Download Netbeans IDE 6 M10 and install JavaFX Script Plug-in.
• Download marge-core-0.4.0.jar in order to facilitate the use of JSR 82 (Java Apis for Bluetooth) that is provided by Project Marge.
• Download avetanabt-20070719.tgz and compile it (if you are using Linux) or bluecove-2.0.1.jar(if you are using Windows) in order to provide a JSR 82 implementation. Take a look in my last post for more explanation.

Insert the Bluetooth USB Adpater in your computer, start Netbeans and create a JavaFX project (File->New Project... and select JavaFX and then JavaFX Application), add the two jars in the project classpath and paste the following BTInquiryFX.fx code (note in the code that Marge is used just to start an inquiry - passing an InquiryListener - and to cancel it).

BTInquiryFX.fx

import javafx.ui.*;
import java.lang.*;

import javax.bluetooth.RemoteDevice;
import javax.bluetooth.DeviceClass;
import javax.bluetooth.DiscoveryAgent;

import net.java.dev.marge.inquiry.DeviceDiscoverer;
import net.java.dev.marge.inquiry.InquiryListener;

    class Model {
        attribute inquiryListener: InquiryListener;
        attribute foundDevices : RemoteDevice[];
        attribute inquiryBtnEnabled : Boolean;
        attribute cancelBtnEnabled : Boolean;
    }

    var model = Model {
        var: self
        inquiryBtnEnabled : true
        cancelBtnEnabled : false
        inquiryListener : new InquiryListener() {
                    operation deviceDiscovered(device: RemoteDevice, deviceClass: DeviceClass) {
                        insert device as last into self.foundDevices; 
                    }

                    operation inquiryCompleted(devices: RemoteDevice[]) {
                        self.inquiryBtnEnabled = true;
                        self.cancelBtnEnabled = false;
                    }

                    operation inquiryError() {
                        self.foundDevices = null;
                        MessageDialog {
                            title: "Error"
                            message: "Inquiry Error"
                            visible: true
                        }
                        self.inquiryBtnEnabled = true;
                        self.cancelBtnEnabled = false;
                    }
            }
    };

    Frame {
            title: "BTInquiryFX"
            width: 400
            height: 200
            resizable: false
            content: BorderPanel {
                top: Label {
                    text: "Found Devices:"
                    }
                center: ListBox {
                     cells: bind foreach (device in model.foundDevices)
                        ListCell {
                                text: "{device.getFriendlyName(false)} - {device.getBluetoothAddress()}"
                        }
                }
                bottom: FlowPanel {
                    content:
                        [Button {
                             text: "Inquiry"
                             enabled : bind model.inquiryBtnEnabled
                             action: operation() {
                                DeviceDiscoverer.getInstance().startInquiry(DiscoveryAgent.GIAC, model.inquiryListener);
                                model.foundDevices = null;
                                model.inquiryBtnEnabled = false;
                                model.cancelBtnEnabled = true;
                             }
                        }, Button {
                             text: "Cancel"
                             enabled : bind model.cancelBtnEnabled
                             action: operation() {
                                DeviceDiscoverer.getInstance().cancelInquiry();
                                model.inquiryBtnEnabled = true;
                                model.cancelBtnEnabled = false;
                             }
                        }]
                }
            }
            visible: true
        };

Screenshots

Then... run it! Here is what we got...

and after the inquiry is completed...

my mobile was found! My mobile runs Java too!!! ;)

This work is licensed under a Creative Commons License.