Introduction to JavaFX on Raspberry Pi

Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

Introduction to JavaFX on Raspberry PiBruno BorgesOracle Product Manager for Latin AmericaJava Evangelist

bit.ly/javafxraspberrypij1

Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 132

Bruno Borges

Oracle Product Manager / Evangelist

Developer, Gamer, Beer lover

JavaFX / Embedded Enthusiast

Twitter: @brunoborges


What do you need to build JavaFX apps?

JavaFX Scene Builder● Linux supported!

Java SE 6/7/8● SE 8 comes with JavaFX libs as part of JRE

NetBeans 7.3.1+

Some things, and coffee


JavaFX Scene Builder 1.1 GAbit.ly/javafxdownload


Raspberry Pi Configurationsfor JavaFX applications

CPU Overclock900~950MHz

Memory split128MB for video

Framebufferframebuffer_width=1280framebuffer_height=720


CPU Overclockfor JavaFX applications

$ cat /proc/cpuinfoProcessor : ARMv6-compatible processor rev 7 (v6l)BogoMIPS : 697.95…$ sudo raspi-config

bit.ly/raspioverclock








Memory Splitfor JavaFX applications

128mb best performance

64mb may work

$ sudo raspi-config


Memory Splitfor JavaFX applications

128mb best performance

64mb may work

$ sudo raspi-config


Video Framebufferfor JavaFX applications

Edit /boot/config.txt

Enable (uncomment) these options, with these values:

framebuffer_width=1280framebuffer_height=720


Exiting a JavaFX Application on Raspberry.Pi

Connect over SSH and kill the java process

$ killall -9 java

Enable the debug environment variable to enable control-C exit command

$ export JAVA_DEBUG=1$ java -cp Stopwatch.jar stopwatch.MainScreen


Final parameters for JavaFX on Raspy

Do not show virtual keyboard (optional)-Dcom.sun.javafx.isEmbedded=false

Send video to the framebuffer (required!)-Djavafx.platform=eglfb


Building Your 1st JavaFX App


Your First JavaFX App for RaspberryPi


Your First JavaFX App for RaspberryPipublic class MyApplication extends Application {

@Override public void start(Stage stage) throws Exception { URL fxml = getClass().getResource("MyApplication.fxml"); Parent root = FXMLLoader.load(fxml); Scene scene = new Scene(root); stage.setScene(scene); stage.setFullScreen(true); // for Desktop. Not need for Pi stage.show(); }

public static void main(String[] args) { launch(args); }

}


Properties

// JavaFXDoubleProperty value = new SimpleDoubleProperty(0);

public double getValue() { return value.get();}

public void setValue(double newValue){ value.set(newValue);}

public DoubleProperty valueProperty() { return value;}


Properties

// JavaFXDoubleProperty value = new SimpleDoubleProperty(0);

public double getValue() { return value.get();}

public void setValue(double newValue){ value.set(newValue);}

public DoubleProperty valueProperty() { return value;}


Bindings

Binding unidirecional● bind();

Binding bi-direcional● bindBidirectional();


Bindings

Binding unidirecional● bind();

Binding bi-direcional● bindBidirectional();


Bindings

@FXMLprivate Label humidityLabel;

...

// HUMIDITY MONITORHumidityMonitor humidityMon = new HumidityMonitor(...); humidityLabel.textProperty().bind(humidityMon.valueProperty());humidityMonitor.start();


Bindings

IntegerProperty number1 = new SimpleIntegerProperty(1);IntegerProperty number2 = new SimpleIntegerProperty(2);DoubleProperty number3 = new SimpleDoubleProperty(0.5);

NumberBinding sum1 = number1.add(number2);NumberBinding result1 = number1 .add(number2) .multiply(number3);

NumberBinding sum2 = Bindings.add(number1, number2);NumberBinding result2 = Bindings .add(number1, multiply(number2, number3));


JAX-RS 2.0 Client API

Download libs from here:

bit.ly/jersey-libs-javafx

https://jersey.java.net/

https://jersey.java.net/



import javax.ws.rs.client.Client;import javax.ws.rs.client.ClientBuilder;...Client client = ClientBuilder.newClient();



String uriTemplate = "http://{host}:{port}/things";

String host = System.getProperty( "things.host", "192.168.1.101");

String port = System.getProperty( "things.port", "8080");



Map<String, Object> params = new HashMap<>();params.put("host", host);params.put("port", port);

UriBuilder uriBuilder = UriBuilder.fromUri(uriTemplate);

Client thingsServerURI = uriBuilder.buildFromMap(params);


JAX-RS 2.0 Client APIUsing the things REST client

String sHumidity = thingsServerURI.path("/humidity").request().get(String.class);


Working with ThreadsUsing the things REST client with threads

class MonitorService extends TimerTask { public void run() { String sval = thingsHumidyPath

.request().get(String.class); final float humidity = new Float(sval); Platform.runLater(new Runnable() { @Override public void run() { floatValue.set(humidity); value.set(Float.toString(humidity)); } }); } }



class MonitorService extends TimerTask { public void run() { String sval = thingsHumidyPath

.request().get(String.class); final float humidity = new Float(sval); Platform.runLater(new Runnable() { @Override public void run() { this.floatValue.set(humidity); this.value.set(Float.toString(humidity)); } }); } }


Back to the Bindings

@FXMLprivate Label humidityLabel;

...

// HUMIDITY MONITORHumidityMonitor humidityMon = new HumidityMonitor(...); humidityLabel.textProperty().bind(humidityMon.valueProperty());humidityMonitor.start();



Start the Monitoring service

Timer timer = new Timer(true);timer.schedule(new MonitorService(), 0, DELAY);


QUESTIONS?


Thanks!

@brunoborges


The preceding is intended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract.It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, and timing of any features or functionality described for Oracle’s products remains at the sole discretion of Oracle.


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Introduction to JavaFX on Raspberry Pi