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![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
17](https://image.slidesharecdn.com/desenvolvendointerfacesricasemjavafxparaultrabook-vj1-130924162856-phpapp02/85/Developing-Rich-Interfaces-in-JavaFX-for-Ultrabooks-17-320.jpg)
![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!
18](https://image.slidesharecdn.com/desenvolvendointerfacesricasemjavafxparaultrabook-vj1-130924162856-phpapp02/85/Developing-Rich-Interfaces-in-JavaFX-for-Ultrabooks-18-320.jpg)
Uploaded byFelipe Pedroso
Developing Rich Interfaces in JavaFX for Ultrabooks
1. The document discusses developing rich interfaces for ultrabooks using JavaFX, which supports touch and gestures. It describes various sensors available on ultrabooks like accelerometers, gyroscopes, and ambient light sensors. 2. It explains how to access these sensors from Java using JNI and the Windows sensor APIs. The process involves registering a Java object to handle sensor events, generating a header file, initializing the sensor in C++, and redirecting events to Java methods. 3. While touch works well on Linux with JavaFX, clear APIs do not exist for accessing sensors on Linux like they do on Windows. The document provides resources for learning more about JavaFX, sensors, and developing for Intel platforms.
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Developing Rich Interfaces in JavaFX for Ultrabooks
- 1. Developing Rich Interfacesin JavaFX for Ultrabooks Bruno Borges Felipe Pedroso
- 2. Agenda • The futureof PCs • JavaFX and Touch Support • Using JNI to work with sensors 2
- 3. Mobile Computing Linesare Blurring Ultrabook™ Convertible & Detachable Ultrabook™ TabletSmartphone Consumption Usages Creation/Productivity Notebook
- 4. The Ultrabook™ Platform Reshapingthe PC Experience 4 Ambient Light Sensor GPS Compass Near Field Communication Gyroscope Ultrabook™ Accelerometer Multi-Touch Context Aware Sensors
- 5. OK, they haveall those features… … but how can we implement them using Java?
- 6. To allow usersto TOUCH my Java App... 6 • 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?
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- 8. Actions supported • Touchevents: 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 8
- 9. What I needto do to manipulate components? • Your components must extend the Node class or any of its subclasses (StackPane, ImageView, etc) • Set the proper EventHandler to handle the action. 9
- 10. What I needto do to manipulate components? 10 • Apply a transform to the component (Translation, Rotation and Scale): • Let’s dive into some code!
- 11. What about thesensors? JNI, I choose you!
- 12. Available sensors onUltrabooks • 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 12
- 13. API Windows –Sensor Fusion 13
- 14. API Windows –Namespaces • Windows.Sensors.* Common sensors – Accelerometer – Gyrometer – Inclinometer – OrientationSensor – SimpleOrientationSensor – Compass – LightSensor • Windows.Devices.Geolocation GPS – Geolocator • Windows.Networking.Proximity NFC – ProximityDevice 14
- 15. 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 15
- 16. How can Iaccess that? 16
- 17. Using JNI toaccess 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 17
- 18. Using JNI toaccess 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! 18
- 19. 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! 19
- 20. Wants to knowmore about Intel Software? http://software.intel.com/en-us/ 20
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- 24. Take aways • ThePC experience is being reshaped • JavaFX + Touch = AWESOME • Using JNI to access the sensors can be LEGENDARY!
- 25. Any doubts? (if yes,the answer is 42)
- 26. Thanks a lot! BrunoBorges facebook.com/brunocborges @brunoborges Felipe Pedroso facebook.com/felipe.a.pedroso @felipeapedroso