Android(安卓)手势识别中的两个默认实现SimpleOnScaleGestureListener、SimpleOnGestureListener

//SimpleOnGestureListener implements OnGestureListener, OnDoubleTapListenerclass ZoomGesture extends GestureDetector.SimpleOnGestureListener {//单手指操作@Override //双击public boolean onDoubleTap(MotionEvent e) {System.out.println("--onDoubleTap---");return true;}@Overridepublic boolean onDoubleTapEvent(MotionEvent e) {System.out.println("--onDoubleTapEvent---");return super.onDoubleTapEvent(e);}}//SimpleOnScaleGestureListener implements OnScaleGestureListenerclass ScaleGesture extends ScaleGestureDetector.SimpleOnScaleGestureListener {//双手指操作@Overridepublic boolean onScale(ScaleGestureDetector detector) {detector.getCurrentSpan();//两点间的距离跨度detector.getCurrentSpanX();//两点间的x距离detector.getCurrentSpanY();//两点间的y距离detector.getFocusX();//detector.getFocusY();//detector.getPreviousSpan();//上次detector.getPreviousSpanX();//上次detector.getPreviousSpanY();//上次detector.getEventTime();//当前事件的事件detector.getTimeDelta();    //两次事件间的时间差detector.getScaleFactor();  //与上次事件相比，得到的比例因子return true;}}

创建手势探测器

private GestureDetector gestureDetector; //手势探测器private ScaleGestureDetector scaleGestureDetector;//比率手势探测器...gestureDetector = new GestureDetector(context, new ZoomGesture());scaleGestureDetector = new ScaleGestureDetector(context, new ScaleGesture());public boolean onTouchEvent(MotionEvent event) {  //单点gestureDetector.onTouchEvent(event);  //双点 scaleGestureDetector.onTouchEvent(event);return true;}

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