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Revision as of 06:14, 22 October 2013 by hamishwillee (Talk | contribs)

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Series 40 Touch API - Gesture API (Chinese)

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max.chen 在 Max.chen 创建
最后由 hamishwillee 在 22 Oct 2013 编辑


从Series 40_6th_Edition_FP1开始,诺基亚Series 40 SDK中加入了 包,对触摸屏手势进行支持。开发者无需再自己实现手势识别引擎。Nokia Gesture API包由两个接口和两个类组成。

S40 touch api gesture 1.png



The GestureEvent interface class is used by an application to receive gesture recognition events from the platform.


This interface is used by applications which need to receive gesture events from the implementation.


The GestureInteractiveZone class is used by an application to define an area of the screen that reacts to a set of specified gestures.


The GestureRegistrationManager class provides the ability to register a GestureListener to be notified when a gesture event occurs within a container.

Gesture API采用了观察者设计模式。




// 创建一个相应所有手势事件的GestureInteractiveZone 对象 GestureInteractiveZone giz = new GestureInteractiveZone( GestureInteractiveZone.GESTURE_ALL ); // 设置相应区域 giz.setRectangle( x, y, width, height);


static int	GESTURE_ALL Constant for All Gesture Events.
static int GESTURE_DRAG Constant for the Drag Gesture.
static int GESTURE_DROP Constant for the Drop Gesture.
static int GESTURE_FLICK Constant for the Flick Gesture.
static int GESTURE_LONG_PRESS Constant for the Long Press Gesture.
static int GESTURE_LONG_PRESS_REPEATED Constant for the Long Press Repeated Gesture.
static int GESTURE_TAP Constant for the Tap Gesture.


GestureListener接口只定义了一个方法:gestureAction(), 当系统的手势识别引擎探测到在第一步中注册了的手势后,这个方法会被调用。该方法每次被调用时会接收到一个GestureEvent实例。GestureEvent中保存有最后接收到的手势事件的参数。

public void gestureAction(Object container, GestureInteractiveZone gestureZone, GestureEvent gestureEvent) 
switch( event.getType() ) {
case GestureInteractiveZone.GESTURE_TAP:
case GestureInteractiveZone.GESTURE_LONG_PRESS:
case GestureInteractiveZone.GESTURE_LONG_PRESS_REPEATED:
case GestureInteractiveZone.GESTURE_DRAG:
case GestureInteractiveZone.GESTURE_DROP:
case GestureInteractiveZone.GESTURE_FLICK:

GestureEvent接口中定义了大量的get方法。 对于所有的手势事件都可以得到x,y坐标;

int	getFlickSpeedX() Query for the Flick gesture events speed in horizontal direction.
int getFlickSpeedY() Query for the Flick gesture events speed in vertical direction.

对于DRAG 和 DROP事件还可以分别得到x和y方向上变化的距离;

int getDragDistanceX() 
Query for the Drag & Drop gesture events movement in horizontal direction since last drag gesture.
int getDragDistanceY()
Query for the Drag & Drop gesture events movement in vertical direction since last drag gesture.


 float	getFlickDirection()      Query for the Flick gesture events direction.
int getFlickSpeed() Query for the Flick gesture events speed in actual flick direction.
int getFlickSpeedX() Query for the Flick gesture events speed in horizontal direction.
int getFlickSpeedY() Query for the Flick gesture events speed in vertical direction.



static boolean	register(java.lang.Object container, GestureInteractiveZone gestureInteractiveZone) 
Register a gesture interactive zone to a container.
static void setListener(java.lang.Object container, GestureListener listener)
Add a listener to the a container.

这两个方法的参数中都包括了一个容器类( Canvas 或者 CustomItem)。下面的代码演示了如何注册GestureInteractiveZone和Listener:

// 注册GestureInteractiveZone
Canvas canvas = new GestureCanvas();
GestureRegistrationManager.register( canvas, giz );
//注册 Listener
GestureRegistrationManager.setListener(canvas, this);

使用Gesture API时应注意:

  • 1. 不要在gestureAction(…)方法中阻塞UI线程。
  • 2. 不要将gestureAction(…)以外的变量指向GestureEvent实例。



This page was last modified on 22 October 2013, at 06:14.
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