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Introduction to JavaFX on Raspberry Pi
- 1. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.
Introduction to JavaFX
on Raspberry Pi
Bruno Borges
Oracle Product Manager for Latin America
Java Evangelist
bit.ly/javafxraspberrypij1
- 2. 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
- 3. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.
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
- 4. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.
JavaFX Scene Builder 1.1 GA
bit.ly/javafxdownload
- 5. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.
Raspberry Pi Configurations
for JavaFX applications
CPU Overclock
900~950MHz
Memory split
128MB for video
Framebuffer
framebuffer_width=1280
framebuffer_height=720
- 6. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.
CPU Overclock
for JavaFX applications
$ cat /proc/cpuinfo
Processor : ARMv6-compatible processor rev 7 (v6l)
BogoMIPS : 697.95
…
$ sudo raspi-config
bit.ly/raspioverclock
- 7. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.
CPU Overclock
for JavaFX applications
$ cat /proc/cpuinfo
Processor : ARMv6-compatible processor rev 7 (v6l)
BogoMIPS : 697.95
…
$ sudo raspi-config
- 8. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.
CPU Overclock
for JavaFX applications
$ cat /proc/cpuinfo
Processor : ARMv6-compatible processor rev 7 (v6l)
BogoMIPS : 697.95
…
$ sudo raspi-config
- 9. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.
Memory Split
for JavaFX applications
128mb best
performance
64mb may work
$ sudo raspi-config
- 10. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.
Memory Split
for JavaFX applications
128mb best
performance
64mb may work
$ sudo raspi-config
- 11. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.
Video Framebuffer
for JavaFX applications
Edit /boot/config.txt
Enable (uncomment) these options, with these values:
framebuffer_width=1280
framebuffer_height=720
- 12. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.
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
- 13. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.
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
- 14. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.
Building Your 1st
JavaFX App
- 15. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1315
Your First JavaFX App for RaspberryPi
- 16. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1316
Your First JavaFX App for RaspberryPi
public 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);
}
}
- 17. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1317
Properties
// JavaFX
DoubleProperty value = new SimpleDoubleProperty(0);
public double getValue() {
return value.get();
}
public void setValue(double newValue){
value.set(newValue);
}
public DoubleProperty valueProperty() {
return value;
}
- 18. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1318
Properties
// JavaFX
DoubleProperty value = new SimpleDoubleProperty(0);
public double getValue() {
return value.get();
}
public void setValue(double newValue){
value.set(newValue);
}
public DoubleProperty valueProperty() {
return value;
}
- 19. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1319
Bindings
Binding unidirecional
●
bind();
Binding bi-direcional
●
bindBidirectional();
- 20. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1320
Bindings
Binding unidirecional
●
bind();
Binding bi-direcional
●
bindBidirectional();
- 21. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1321
Bindings
@FXML
private Label humidityLabel;
...
// HUMIDITY MONITOR
HumidityMonitor humidityMon = new HumidityMonitor(...);
humidityLabel.textProperty().bind(humidityMon.valueProperty());
humidityMonitor.start();
- 22. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1322
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));
- 23. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1323
JAX-RS 2.0 Client API
Download libs from here:
bit.ly/jersey-libs-javafx
https://jersey.java.net/
- 24. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1324
JAX-RS 2.0 Client API
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
...
Client client = ClientBuilder.newClient();
- 25. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1325
JAX-RS 2.0 Client API
String uriTemplate = "http://{host}:{port}/things";
String host = System.getProperty(
"things.host",
"192.168.1.101");
String port = System.getProperty(
"things.port",
"8080");
- 26. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1326
JAX-RS 2.0 Client API
Map<String, Object> params = new HashMap<>();
params.put("host", host);
params.put("port", port);
UriBuilder uriBuilder = UriBuilder.fromUri(uriTemplate);
Client thingsServerURI = uriBuilder.buildFromMap(params);
- 27. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1327
JAX-RS 2.0 Client API
Using the things REST client
String sHumidity = thingsServerURI
.path("/humidity")
.request()
.get(String.class);
- 28. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1328
Working with Threads
Using 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));
}
});
}
}
- 29. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1329
Working with Threads
Using 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() {
this.floatValue.set(humidity);
this.value.set(Float.toString(humidity));
}
});
}
}
- 30. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1330
Back to the Bindings
@FXML
private Label humidityLabel;
...
// HUMIDITY MONITOR
HumidityMonitor humidityMon = new HumidityMonitor(...);
humidityLabel.textProperty().bind(humidityMon.valueProperty());
humidityMonitor.start();
- 31. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1331
Working with Threads
Using the things REST client with threads
Start the Monitoring service
Timer timer = new Timer(true);
timer.schedule(new MonitorService(), 0, DELAY);
- 33. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1333
Thanks!
@brunoborges
- 34. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.
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.