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我正在制作一个应用程序，其中有一个小玩具，左侧有一些连衣裙（ListView），您可以选择连衣裙。从该列表视图中，您只需选择一件衣服，这件衣服就会自动添加到视图中，现在我可以轻松拖动它，但我无法放大/缩小它。

下面是我的代码：

       mKittyBGLayer.setOnTouchListener(new OnTouchListener() {
        public boolean onTouch(View v, MotionEvent event) {
            for (ImageView img1 : mArrayList) {
                if (kittyStatus == img1.getId()) {
                    mKittyDress = img1;
                    break;
                }
            }
            if (mKittyDress != null) {
                LayoutParams lp = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, (int) event.getX()
                        - mKittyDress.getWidth() / 2, (int) event.getY() - mKittyDress.getHeight() / 2);
                mKittyDress.setLayoutParams(lp);

                // Handle touch events here...
                switch (event.getAction() & MotionEvent.ACTION_MASK) {
                case MotionEvent.ACTION_DOWN:
                    savedMatrix.set(matrix);
                    start.set(event.getX(), event.getY());
                    mode = DRAG;
                    break;

                case MotionEvent.ACTION_POINTER_DOWN:
                    oldDist = spacing(event);
                    if (oldDist > 10f) {
                        savedMatrix.set(matrix);
                        midPoint(mid, event);
                        mode = ZOOM;
                    }
                    break;

                case MotionEvent.ACTION_UP:
                case MotionEvent.ACTION_POINTER_UP:
                    mode = NONE;
                    break;
                case MotionEvent.ACTION_MOVE:
                    if (mode == DRAG) {
                        // ...
                        matrix.set(savedMatrix);
                        matrix.postTranslate(event.getX() - start.x, event.getY() - start.y);
                    } else if (mode == ZOOM) {
                        float newDist = spacing(event);
                        if (newDist > 10f) {
                            matrix.set(savedMatrix);
                            float scale = newDist / oldDist;
                            matrix.postScale(scale, scale, mid.x, mid.y);
                        }
                    }
                    break;
                }

                mKittyDress.setImageMatrix(matrix);
                return true; // indicate event was handled
            }
            return true;
        }
    });


      /** Determine the space between the first two fingers */
private float spacing(MotionEvent event) {
    float x = event.getX(0) - event.getX(1);
    float y = event.getY(0) - event.getY(1);
    return FloatMath.sqrt(x * x + y * y);
}

/** Calculate the mid point of the first two fingers */
private void midPoint(PointF point, MotionEvent event) {
    float x = event.getX(0) + event.getX(1);
    float y = event.getY(0) + event.getY(1);
    point.set(x / 2, y / 2);
}
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1 回答 1

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在这种情况下，我实际上所做的是使用 aWebView来显示图像。这为用户提供了与他们习惯完全匹配的缩放/滚动手势和惯性。

于 2012-10-29T16:11:17.130 回答