ViewPager和ImageView缩放问题

Question

我正在尝试使用ViewPager实现图像库.另外,为了实现缩放功能,我使用的是来自github的TouchImageView.我也尝试过使用ZoomableImageView.

但是,问题是,如果我缩放图像并且如果我滚动图像,那么而不是图像,ViewPager正在滚动并且下一个视图ViewPager正在加载.

如果我缩放图像然后如果我滚动它,那么图像必须移动而不是 ViewPager

只有在到达缩放图像的末尾时,才能加载ViewPager的下一个视图.怎么做？

我无法找到它.如果我对角地触摸并拖动图像,那么图像就会被移动.或者调用ViewPager的拖动.

ps:这不重复.缩放完成.但问题是图像缩放后.

Answer 1

是的,我也遇到了与TouchImageView不同的问题.

当我的视图获得焦点时,太过解决了我所做的问题是禁用了ViewPager.

public class EnableDisableViewPager extends ViewPager {

    private boolean enabled = true;

    public EnableDisableViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent arg0) {
        if(enabled)
            return super.onInterceptTouchEvent(arg0);

        return false;
    }

    public boolean isEnabled() {
        return enabled;
    }

    public void setEnabled(boolean enabled) {
        this.enabled = enabled;
    }
}

所以在TouchImageView中实现你的监听器来触发一个事件,无论是缩放还是拖动.

将侦听器设置为Activity中的视图对象.因此,当发生这些事件时,只需禁用视图寻呼机.

注意:您还需要一个鼠标注册事件来启用viewpager.

EDITED

这仅适用于Zoom,因此要使ViewPager滑动页面,您应该缩放回原始页面.

将这些代码添加到TouchImageView中

    public class TouchImageView extends ImageView {

        ...
    private TouchEventListener touchEventListener;

        private void sharedConstructing(Context context) {
            ...

            setOnTouchListener(new OnTouchListener() {

                @Override
                public boolean onTouch(View v, MotionEvent event) {
                    ...
                        case MotionEvent.ACTION_UP:
                            ...
                            if(touchEventListener != null)
                            {
                                if(saveScale == 1.0)
                                    touchEventListener.onZoomToOriginal();
                                else
                                    touchEventListener.onZoom();
                            }
                            break;

                        ...
                    }
                    ...
                }

            });
        }

        ...

public TouchEventListener getTouchEventListener() {
        return touchEventListener;
    }

    public void setTouchEventListener(TouchEventListener touchEventListener) {
        this.touchEventListener = touchEventListener;
    }


        public interface TouchEventListener 
        {
            void onZoom();
            void onZoomToOriginal();
        }
    }

更好的解决方案

我们可以通过使用下面给出的方法将ViewPager扩展到新类,从而实现这一目标.

requestDisallowInterceptTouchEvent(true);

有了这个,我们可以滑动而不会缩小到原始位置,就像我们在Gallery和许多其他应用程序中看到的那样.

public class TouchImageView extends ImageView {

        ...
private void stopInterceptEvent()
{
    getParent().requestDisallowInterceptTouchEvent(true);
}

private void startInterceptEvent()
{
    getParent().requestDisallowInterceptTouchEvent(false);
}

private void sharedConstructing(Context context) {
    super.setClickable(true);
    this.context = context;
    mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
    matrix.setTranslate(1f, 1f);
    m = new float[9];
    setImageMatrix(matrix);
    setScaleType(ScaleType.MATRIX);

    setOnTouchListener(new OnTouchListener() {

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

            matrix.getValues(m);
            float x = m[Matrix.MTRANS_X];
            float y = m[Matrix.MTRANS_Y];
            PointF curr = new PointF(event.getX(), event.getY());

            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    last.set(event.getX(), event.getY());
                    start.set(last);
                    mode = DRAG;
                    stopInterceptEvent();
                    break;
                case MotionEvent.ACTION_MOVE:
                    if (mode == DRAG) {
                        float deltaX = curr.x - last.x;
                        float deltaY = curr.y - last.y;
                        float scaleWidth = Math.round(origWidth * saveScale);
                        float scaleHeight = Math.round(origHeight * saveScale);
                        if (scaleWidth < width) {
                            deltaX = 0;
                            if (y + deltaY > 0)
                                deltaY = -y;
                            else if (y + deltaY < -bottom)
                                deltaY = -(y + bottom); 
                        } else if (scaleHeight < height) {
                            deltaY = 0;
                            if (x + deltaX > 0)
                                deltaX = -x;
                            else if (x + deltaX < -right)
                                deltaX = -(x + right);
                        } else {
                            if (x + deltaX > 0)
                                deltaX = -x;
                            else if (x + deltaX < -right)
                                deltaX = -(x + right);

                            if (y + deltaY > 0)
                                deltaY = -y;
                            else if (y + deltaY < -bottom)
                                deltaY = -(y + bottom);
                        }

                        if(deltaX == 0)
                            startInterceptEvent();
                        else
                            stopInterceptEvent();

                        matrix.postTranslate(deltaX, deltaY);
                        last.set(curr.x, curr.y);
                    }
                    break;

                case MotionEvent.ACTION_UP:
                    mode = NONE;
                    int xDiff = (int) Math.abs(curr.x - start.x);
                    int yDiff = (int) Math.abs(curr.y - start.y);
                    if (xDiff < CLICK && yDiff < CLICK)
                        performClick();
                    startInterceptEvent();
                    break;

                case MotionEvent.ACTION_POINTER_UP:
                    mode = NONE;
                    break;
            }
            setImageMatrix(matrix);
            invalidate();
            return true; // indicate event was handled
        }

    });
}
}