手势检测器不​​工作

问题描述

I具有以下GestureListener：

 公共类BookListener扩展SimpleOnGestureListener工具
        OnTouchListener {
    私人LibraryActivity为主;
民营书的书;
私人GestureDetector姿态;

公共BookListener（书书，LibraryActivity主）{
    this.main =为主;
    this.book =书;
    手势=新GestureDetector（主，这一点）;
}

公共布尔onDoubleTap（MotionEvent E）{
    main.showInfo（书）;
    返回true;
}

公共布尔onSingleTapConfirmed（MotionEvent E）{
    main.openBook（book.getUrl（））;
    返回true;
}

公共布尔onDown（MotionEvent EVT）{
    返回false;
}

@覆盖
公共布尔onTouch（视图V，MotionEvent事件）{
    返回gesture.onTouchEvent（事件）;
    }
}
 

我把它添加到我的查看方式是这样的：

  view.setOnTouchListener（新BookListener（书，主））;
 

但运行时，事件不被触发时，我调试它，我看到onDown叫，但onSingleTapConfirmed或onDoubleTap讷韦尔工作。

怎么了？

我有这个code与工程完美：

 私有类GestureListener扩展SimpleOnGestureListener {
        私人布尔newEvent = TRUE;
        @覆盖
        公共布尔onDoubleTap（MotionEvent E）{
            document.rescale（）;
            refreshImage（）;
            返回true;
        }

        公共布尔onDown（MotionEvent EVT）{
            newEvent = TRUE;
            返回false;
        }

        @覆盖
        公共布尔onScroll（MotionEvent E1，E2 MotionEvent，
                浮distanceX，浮distanceY）{
            如果（document.isScaled（）及！＆安培; newEvent）{
                的Vector2Dν=新的Vector2D（E2）.minus（新的Vector2D（E1））;
                如果（v.getX（）→60 || v.getX（）＆所述-60）{
                    如果（v.getX（）℃，）
                        下一个（）;
                    其他
                        previous（）;
                    newEvent = FALSE;
                }
            } 其他 {
                img.notifyScroll（-distanceX，-distanceY）;
                img.invalidate（）;
            }
            返回true;
        }

        @覆盖
        公共布尔onSingleTapConfirmed（MotionEvent E）{
            switchSideBar（）;
            返回true;
        }
    }
 

解决方案

onDown（）必须返回真连如果你不希望反应的是的事件，否则就会使探测器放弃任何下列事件，因此任何的手势。

I has the following GestureListener:

public class BookListener extends SimpleOnGestureListener implements
        OnTouchListener {
    private LibraryActivity main;
private Book book;
private GestureDetector gesture;

public BookListener(Book book, LibraryActivity main) {
    this.main = main;
    this.book = book;
    gesture = new GestureDetector(main,this);
}

public boolean onDoubleTap(MotionEvent e) {
    main.showInfo(book);
    return true;
}

public boolean onSingleTapConfirmed(MotionEvent e) {
    main.openBook(book.getUrl());
    return true;
}

public boolean onDown(MotionEvent evt){
    return false;
}

@Override
public boolean onTouch(View v, MotionEvent event) {
    return gesture.onTouchEvent(event);
    }
}

I add it to my View by this way:

view.setOnTouchListener(new BookListener(book, main));

But when running, the events are not triggered, I debug it, I see the onDown is called, but onSingleTapConfirmed or onDoubleTap nevers works.

What's wrong?

I has this code with works perfectly:

    private class GestureListener extends SimpleOnGestureListener {
        private boolean newEvent = true;
        @Override
        public boolean onDoubleTap(MotionEvent e) {
            document.rescale();
            refreshImage();
            return true;
        }

        public boolean onDown(MotionEvent evt){
            newEvent = true;
            return false;
        }

        @Override
        public boolean onScroll(MotionEvent e1, MotionEvent e2,
                float distanceX, float distanceY) {
            if (!document.isScaled() && newEvent) {
                Vector2D v = new Vector2D(e2).minus(new Vector2D(e1));
                if (v.getX() > 60 || v.getX() < -60){
                    if (v.getX() < 0)
                        next();
                    else
                        previous();
                    newEvent = false;
                }
            } else {
                img.notifyScroll(-distanceX, -distanceY);
                img.invalidate();
            }
            return true;
        }

        @Override
        public boolean onSingleTapConfirmed(MotionEvent e) {
            switchSideBar();
            return true;
        }
    }

解决方案

onDown() must return true even if you don't want to react to that event, or else it will make the detector discard any following event and hence any gesture.

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