Android手势
//如果不在主线程中创建,则需要 Looper.prepare(),因为内部的创建Handler()用于数据传输需要 Loop,也可以传一个Handler进去，Handler(Looper.getMainLooper())
gestureDetector = GestureDetector(this, object : GestureDetector.SimpleOnGestureListener() {
// OnContextClickListener
override fun onContextClick(e: MotionEvent?): Boolean {
// 监听外部设备按钮
Log.d("Gesture", "onContextClick")
return super.onContextClick(e)
}
//OnDoubleTapListener
override fun onSingleTapConfirmed(e: MotionEvent?): Boolean {
//当发生双击时不会触发,两次点击在300ms(ViewConfiguration.DOUBLE_TAP_TIMEOUT)之内 ，通过 Handler().sendEmptyMessageDelayed()实现
Log.d("Gesture", "onSingleTapConfirmed")
return super.onSingleTapConfirmed(e)
}
override fun onDoubleTap(e: MotionEvent?): Boolean {
//当第二次 action 为 "0-down"的时候就触发此方法
Log.d("Gesture", "onDoubleTap")
return super.onDoubleTap(e)
}
override fun onDoubleTapEvent(e: MotionEvent): Boolean {
//二次点击的Action 变化时会触发，如果要在 action 为"1-up"的时候处理，就在这个方法里实现逻辑
Log.d("Gesture", "onDoubleTapEvent - ${e.action}")
return super.onDoubleTapEvent(e)
}
//OnGestureListener
override fun onDown(e: MotionEvent?): Boolean {
//按下
Log.d("Gesture", "onDown")
return super.onDown(e)
}
override fun onShowPress(e: MotionEvent?) {
//延时回调 100(ViewConfiguration.TAP_TIMEOUT)后还是处于 action "0-down"就会触发
Log.d("Gesture", "onShowPress")
super.onShowPress(e)
}
override fun onSingleTapUp(e: MotionEvent?): Boolean {
//双击时，onDoubleTapUp会触发，onSingleTapUp会在第一次"down"时触发
Log.d("Gesture", "onSingleTapUp")
return super.onSingleTapUp(e)
}
override fun onScroll(e1: MotionEvent?, e2: MotionEvent?, distanceX: Float, distanceY: Float): Boolean {
//快速滑动
Log.d("Gesture", "onScroll")
return super.onScroll(e1, e2, distanceX, distanceY)
}
override fun onLongPress(e: MotionEvent?) {
//长按 500(ViewConfiguration.DEFAULT_LONG_PRESS_TIMEOUT)后还是处于 action "0-down"就会触发
Log.d("Gesture", "onLongPress")
super.onLongPress(e)
}
override fun onFling(e1: MotionEvent?, e2: MotionEvent?, velocityX: Float, velocityY: Float): Boolean {
//快速滑动后抬起
Log.d("Gesture", "onFling")
return super.onFling(e1, e2, velocityX, velocityY)
}
})
-
GestureDetector
- 构造方法，实际上调用的都是
GestureDetector(Context context, OnGestureListener listener, Handler handler)其中handler 一般可以不传，类内部会自行创建。Handler用于处理数据需要Looper。如果不在主线程中创建
GestureDetector，则在之前执行Looper.prepare()或需传Handler(Looper.getMainLooper()- 监听器
-
OnContextClickListener
API:23, detector.onGenericMotionEvent(MotionEvent)
name description onContextClick 监听外部设备按钮 OnDoubleTapListener
detector.onTouchEvent(MotionEvent)
name description onSingleTapConfirmed 当发生双击时不会触发;延时回调，两次点击在300ms(ViewConfiguration.DOUBLE_TAP_TIMEOUT)之内 ，Handler().sendEmptyMessageDelayed() onDoubleTap 当第二次(300ms之内) action 为 "0-down"的时候就触发此方法 onDoubleTapEvent 二次点击的Action 变化时会触发，如果要在 action 为"1-up"的时候处理，就在这个方法里实现逻辑 - OnGestureListener
detector.onTouchEvent(MotionEvent)
name description onDown 按下 onShowPress 触摸, 延时回调 100(ViewConfiguration.TAP_TIMEOUT)后还是处于 action "0-down"就会触发,Handler().sendEmptyMessageAtTime() onSingleTapUp 单击时触发, 双击时onDoubleTapUp会触发,此时onSingleTapUp会在第一次"down"时触发,第二次不触发 onScroll 滑动 onLongPress 长按 500(ViewConfiguration.DEFAULT_LONG_PRESS_TIMEOUT)后还是处于 action "0-down"就会触发,Handler().sendEmptyMessageAtTime() onFling 快速滑动后抬起
-
ScaleGestureDetector
private var preScale: Float = 1.0F private var curScale: Float = 1.0F scaleGestureDetector = ScaleGestureDetector(this, object : ScaleGestureDetector.SimpleOnScaleGestureListener() { override fun onScaleBegin(detector: ScaleGestureDetector): Boolean { Log.d( "ScaleGesture", "onScaleBegin: scaleFactor-${detector.scaleFactor} focusX-${detector.focusX} focusY-${detector.focusY}" ) return true } override fun onScale(detector: ScaleGestureDetector): Boolean { //保证连续性，不处理的话有明显的抖动 curScale = detector.scaleFactor * preScale if (curScale > 5 || curScale < 0.1) { curScale = preScale return true } testV.scaleY = curScale testV.scaleX = curScale preScale = curScale Log.d( "ScaleGesture", "onScale: scaleFactor-${detector.scaleFactor} focusX-${detector.focusX} focusY-${detector.focusY}" ) return super.onScale(detector) } override fun onScaleEnd(detector: ScaleGestureDetector) { Log.d( "ScaleGesture", "onScaleEnd: scaleFactor-${detector.scaleFactor} focusX-${detector.focusX} focusY-${detector.focusY}" ) } })- 构造方法
ScaleGestureDetector(Context context, OnScaleGestureListener listener, Handler handler)同GestureDetector
- 监听器
- OnScaleGestureListener
name description onScaleBegin 缩放手势开始，返回false时,不使用此次缩放手势,继续回调onScaleBegin();返回true 则回调 onScale() onScale 触发缩放，返回false,继续回调onScale();返回true,回调onScaleEnd(),这次缩放结束 onScaleEnd 缩放结束，在onScale()中返回为true, 或有手指抬起时，触发此方法
