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GestureDetector的用法和介绍 android教程
来源:互联网   发布日期:2015-09-29 10:31:22   浏览:1928次  

导读:类描述:通过系统提供的MotionEvent来监测各种手势和(触摸)事件。当一个指定的手势事件发生 时,GestureDetector.OnGestureListener回调函数将通告用户。这个类仅仅处理由触摸引发的MotionEvent(不能 处理由......

类描述:

通过系统提供的MotionEvent来监测各种手势和(触摸)事件。当一个指定的手势事件发生 时,GestureDetector.OnGestureListener回调函数将通告用户。这个类仅仅处理由触摸引发的MotionEvent(不能 处理由轨迹球引发的事件)。

类中的一些手势类型:

1.booleanonDoubleTap(MotionEvent e)解释:双击的第二下Touch down时触发

2.booleanonDoubleTapEvent(MotionEvent e)解释:双击的第二下Touch down和up都会触发,可用e.getAction()区分。

3.booleanonDown(MotionEvent e)解释:Touch down时触发

4.booleanonFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)解释:Touch了滑动一点距离后,up时触发。

5.voidonLongPress(MotionEvent e)解释:Touch了不移动一直Touch down时触发

6.booleanonScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY)解释:Touch了滑动时触发。

7.voidonShowPress(MotionEvent e)解释:Touch了还没有滑动时触发(与onDown,onLongPress)比较onDown只要Touch down一定立刻触发。而Touchdown后过一会没有滑动先触发onShowPress再是onLongPress。所以Touchdown后一直不 滑动,onDown->onShowPress->onLongPress这个顺序触发。

8.booleanonSingleTapConfirmed(MotionEvent e)

9.booleanonSingleTapUp(MotionEvent e)解释:上面这两个函数都是在touch down后又没有滑动(onScroll),又没有长按(onLongPress),然后Touchup时触发。

点击一下非常快的(不滑动)Touchup:onDown->onSingleTapUp->onSingleTapConfirmed

点击一下稍微慢点的(不滑 动)Touchup:onDown->onShowPress->onSingleTapUp->onSingleTapConfirmed

使用方法:

构造出来,mGestureDetector = new GestureDetector(mGestureListener);

mGestureListener = new BookOnGestureListener();

class BookOnGestureListener implements OnGestureListener {

同时要public boolean onTouchEvent(MotionEvent event) {

mGestureListener .onTouchEvent(event);

}

这样就可以判断手势MotionEvent 的类型了,然后做出一些处理。

下面贴出一个类做参考、

class BookOnGestureListener implements OnGestureListener {

public boolean onDown(MotionEvent event) {

Log.d(LOG_TAG, "onDown");

if (mState == BookState.ANIMATING)

return false;

float x = event.getX(), y = event.getY();

int w = layoutWidth, h = layoutHeight;

if (x * x + y * y < clickCornerLen) {

if (indexPage > 0) {

mSelectCorner = Corner.LeftTop;

aniStartPos = new Point(0, 0);

}

} else if ((x - w) * (x - w) + y * y < clickCornerLen) {

if (indexPage < totalPageNum - 1) {

mSelectCorner = Corner.RightTop;

aniStartPos = new Point(layoutWidth, 0);

}

} else if (x * x + (y - h) * (y - h) < clickCornerLen) {

if (indexPage > 0) {

mSelectCorner = Corner.LeftBottom;

aniStartPos = new Point(0, layoutHeight);

}

} else if ((x - w) * (x - w) + (y - h) * (y - h) < clickCornerLen) {

if (indexPage < totalPageNum - 1) {

mSelectCorner = Corner.RightBottom;

aniStartPos = new Point(layoutWidth, layoutHeight);

}

}

if (mSelectCorner != Corner.None) {

aniStopPos = new Point((int) x, (int) y);

aniTime = 800;

mState = BookState.ABOUT_TO_ANIMATE;

closeBook = false;

aniStartTime = new Date();

mBookView.startAnimation();

}

return false;

}

public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,

float velocityY) {

Log.d(LOG_TAG, "onFling velocityX:" + velocityX + " velocityY:"

+ velocityY);

if (mSelectCorner != Corner.None) {

if (mSelectCorner == Corner.LeftTop) {

if (velocityX < 0) {

aniStopPos = new Point(0, 0);

} else {

aniStopPos = new Point(2 * layoutWidth, 0);

}

} else if (mSelectCorner == Corner.RightTop) {

if (velocityX < 0) {

aniStopPos = new Point(-layoutWidth, 0);

} else {

aniStopPos = new Point(layoutWidth, 0);

}

} else if (mSelectCorner == Corner.LeftBottom) {

if (velocityX < 0) {

aniStopPos = new Point(0, layoutHeight);

} else {

aniStopPos = new Point(2 * layoutWidth, layoutHeight);

}

} else if (mSelectCorner == Corner.RightBottom) {

if (velocityX < 0) {

aniStopPos = new Point(-layoutWidth, layoutHeight);

} else {

aniStopPos = new Point(layoutWidth, layoutHeight);

}

}

Log.d(LOG_TAG, "onFling animate");

aniStartPos = new Point((int) scrollX, (int) scrollY);

aniTime = 1000;

mState = BookState.ABOUT_TO_ANIMATE;

closeBook = true;

aniStartTime = new Date();

mBookView.startAnimation();

}

return false;

}

public void onLongPress(MotionEvent e) {

Log.d(LOG_TAG, "onLongPress");

}

public boolean onScroll(MotionEvent e1, MotionEvent e2,

float distanceX, float distanceY) {

mState = BookState.TRACKING;

if (mSelectCorner != Corner.None) {

scrollX = e2.getX();

scrollY = e2.getY();

mBookView.startAnimation();

}

return false;

}

public void onShowPress(MotionEvent e) {

Log.d(LOG_TAG, "onShowPress");

}

public boolean onSingleTapUp(MotionEvent e) {

Log.d(LOG_TAG, "onSingleTapUp");

if (mSelectCorner != Corner.None) {

if (mSelectCorner == Corner.LeftTop) {

if (scrollX < layoutWidth / 2) {

aniStopPos = new Point(0, 0);

} else {

aniStopPos = new Point(2 * layoutWidth, 0);

}

} else if (mSelectCorner == Corner.RightTop) {

if (scrollX < layoutWidth / 2) {

aniStopPos = new Point(-layoutWidth, 0);

} else {

aniStopPos = new Point(layoutWidth, 0);

}

} else if (mSelectCorner == Corner.LeftBottom) {

if (scrollX < layoutWidth / 2) {

aniStopPos = new Point(0, layoutHeight);

} else {

aniStopPos = new Point(2 * layoutWidth, layoutHeight);

}

} else if (mSelectCorner == Corner.RightBottom) {

if (scrollX < layoutWidth / 2) {

aniStopPos = new Point(-layoutWidth, layoutHeight);

} else {

aniStopPos = new Point(layoutWidth, layoutHeight);

}

}

aniStartPos = new Point((int) scrollX, (int) scrollY);

aniTime = 800;

mState = BookState.ABOUT_TO_ANIMATE;

closeBook = true;

aniStartTime = new Date();

mBookView.startAnimation();

}

return false;

}

}

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相关热词: GestureDetector

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