Developing Rich Interfaces in JavaFX for Ultrabooks
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Presentation about developing JavaFX for Intel Ultrabooks, taking advantage of the multi-touch support and also sensors. By Intel Brazil Community Manager, Felipe Pedroso and Oracle Product Manager, Bruno Borges.
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Developing Rich Interfaces in JavaFX for Ultrabooks
- 1. Developing Rich Interfaces in JavaFX for Ultrabooks Felipe Pedroso Community Manager – Intel Brazil Bruno Borges Principal Product Manager - Oracle LAD
- 2. 2 Program Agenda The Future of PCs JavaFX and Touch Support Using JNI to Work with Sensors
- 4. 4 First GPS-enabled Released on 2007
- 8. 8 Ultrabook™ Convertible & Detachable Ultrabook ™TabletSmartphone Consumption Usages Creation/Productivity Notebook
- 9. 9 The Ultrabook™ Platform Reshaping the PC Experience 9 Ambient Light Sensor Ambient Light Sensor GPS GPS Compass Compass Near Field Communicati on Near Field Communicati on Gyroscope Gyroscope Ultrabook ™ Accelerometer Accelerometer Multi-Touch Multi-Touch Context Aware Sensors
- 10. 10 OK, they have all those features… … but how can we implement them using Java?
- 11. 11 To allow users to TOUCH my Java App... • Should I use... – AWT? Swing? SWT? • Actually, you can use them but... – They aren’t made for multi-touch (OK, there’s a way to do it) – You must optimize your UI controls to be more ‘touch friendly’ • So, how to do it in a simple and easy way?
- 12. 12
- 14. 14 Actions supported • Touch events: Down, Move and Up – Tap (Down and Up) / Double tap – Drag and Drop (Down, Move and Up) – Hold • Gestures – Swipe: Up, Down, Left and Right – Zoom: Pinch / Spread – Rotate
- 15. 15 • Your components must extend the Node class or any of its subclasses (StackPane, ImageView, etc) • Set the proper EventHandler to handle the action. 15 What do I need to do to manipulate components?
- 16. 16 • Apply a transform to the component (Translation, Rotation and Scale): • Let’s dive into some code! What do I need to do to manipulate components?
- 18. 18 Available sensors on Ultrabooks • Accelerometer – Proper acceleration in three axis (x, y, z) • Gyrometer – Device orientation • Magnetometer – Strenght and direction of magnetic fields • GPS (Global Positioning System) – Location and Time information • NFC – Near Field Communication • Ambient Light Sensor – Ambient Light Level 18
- 19. 19 API Windows – Sensor Fusion
- 20. 20 API Windows – Namespaces • Windows.Sensors.* Common sensors – Accelerometer – Gyrometer – Inclinometer – OrientationSensor – SimpleOrientationSensor – Compass – LightSensor • Windows.Devices.Geolocation GPS – Geolocator • Windows.Networking.Proximity NFC – ProximityDevice
- 21. 21 Windows API – How to • Get the default object of your sensor using the GetDefault method • You can call the GetCurrentReading() to get the current value of the sensors or... • ... work with the ReadingChanged event – Set the attribute ReportInterval (please, respect the MinimumReportInterval to avoid problems) – Delegate a method to handle the event (something like setting a method as a listener) – Handle the event! • This procedure is valid only for sensors from Windows.Sensors namespace
- 22. 22 How can I access that?
- 23. 23 Using JNI to access the sensors from Windows.Sensors 1. [Java] Create a native method to register the object that will handle the events that come from the sensor 2. Generate the header file using javah 3. [C++] Create a DLL Project in Visual Studio with the DLLs and namespaces of the Windows 8 APIS 4. [C++] Use a variable to keep a reference to the object and the ID (GetMethodID) of the method that will handle the event
- 24. 24 Using JNI to access the sensors from Windows.Sensors 5. [C++] Initialize the sensor and delegate a C++ method to handle the event 6. [C++] Redirect the delegate method call to the Java method using the function CallVoidMethod with the following parameters: the Java Object, the method ID and it’s parameters 7. [Java] Handle the event! A lot of text? Please, show me the code!
- 25. 25 JNI Callback from C++ to Java public final class ShakenSensor { static { System.loadLibrary("ShakenLib"); } private ShakenListener listener; public ShakenSensor (ShakenListener listener) { this.listener = listener; } public native boolean registerObject(); public native boolean registerMethod(); private void shaken(long timestamp) { listener.shaken(timestamp); } } Load the C++ Library Define native methods private method to be called from C++
- 26. 26 JNI Callback from C++ to Java // Shaken.h JNIEXPORT jboolean JNICALL Java_sample_ShakenSensor_registerObject (JNIEnv *, jobject obj); JNIEXPORT jboolean JNICALL Java_sample_ShakenSensor_registerMethod (JNIEnv * env, jobject obj); The header file with mapped native JNI methods
- 27. 27 JNI Callback from C++ to Java // Shaken.cpp #include "Shaken.h" #include "jni.h" #include<iostream> #using <Windows.winmd> #using <Platform.winmd> using namespace::Windows::Devices::Sensors; JavaVM * currentJvm; jobject shakenSensorJObject; jmethodID shakenJMethod; // ShakenSensor.shaken(long) cpp file including: Windows Sensor Fusion API Java Native Interface header Shaken header Keep references of jobject, jmethodID, currentJvm
- 28. 28 JNI Callback from C++ to Java // Shaken.cpp …_ShakenSensor_registerObject (JNIEnv * env, jobject obj) { shakenSensorJObject = env->NewGlobalRef(obj); jclass shakenSensorClass = env->GetObjectClass(shakenSensorJObject); shakenJMethod = env->GetMethodID(shakenSensorClass, "shaken", "(J)V"); env->GetJavaVM(¤tJvm); … } Get a reference to ShakenSensor object from JNIEnv, then the jclass, then the shaken Java method
- 29. 29 JNI Callback from C++ to Java // Shaken.cpp void Shaken(Accelerometer^ sender, AccelerometerShakenEventArgs^ args){ invokeShakenOnJava(args->Timestamp.UniversalTime / 10000); } …_ShakenSensor_registerMethod (JNIEnv * env, jobject obj) { accelerometer->Shaken += ref new Windows::Foundation::TypedEventHandler<Accelerometer^,AccelerometerShakenEventArgs^>(&Shaken); … } registerMethod activates the Sensor and register events to Shaken C++ method Shaken method forwards data to Java
- 30. 30 JNI Callback from C++ to Java // Shaken.cpp void invokeShakenOnJava(jlong timest){ JNIEnv * jniEnvironment; int envStt = currentJvm->GetEnv((void **)&jniEnvironment, JNI_VERSION_1_6); // check the envStat == JNI_OK //and call currentJvm->AttachCurrentThread if necessary … // call the Java method on the ShakenSensor Java Object jniEnvironment->CallVoidMethod(shakenSensorJObject, shakenJMethod,timest); // always detach current thread currentJvm->DetachCurrentThread(); } Make sure JVM is attached to thread, then call the method shakenJMethod
- 31. 31 What about Linux? Touch works fine, but there aren’t clear APIs to read sensors. If you know how to do it, let’s work together!
- 32. 32 Want to know more about Intel Software? http://software.intel.com/en-us/
- 35. 35
- 36. 36 • The PC experience is being reshaped • JavaFX + Touch = AWESOME • Using JNI to access the sensors can be LEGENDARY! Take aways
- 37. 37 Questions? (if yes, the answer is 42)
- 38. 38 Thanks a lot! Bruno Borges facebook.com/brunocborges @brunoborges Felipe Pedroso facebook.com/felipe.a.pedroso @felipeapedroso