Android：放大两个视图

您可以使用此答案中ImageView提供的自定义，该自定义支持缩放和缩放，并且要获取要应用于自定义视图的比例值，您需要创建一个带有回调的侦听器，您通常可以从下面的onScale()方法中调用该回调ScaleListener

interface OnScaleListener {
    public onScaleChange(float scaleFactor);
}

OnScaleListener mOnScaleListener;

setScaleListener(OnScaleListener listener) {
    this.mOnScaleListener = listener;
}

然后使用的值触发此回调，该值mScaleFactor反映放大/缩小图像的程度。因此您可以在此类内创建onScaleListener接口的实例，并触发其回调onScaleChange()

这是处理缩放的自定义ImageView的内部类。

    private class ScaleListener extends
            ScaleGestureDetector.SimpleOnScaleGestureListener {
        @Override
        public boolean onScaleBegin(ScaleGestureDetector detector) {
            mode = ZOOM;
            return true;
        }

        @Override
        public boolean onScale(ScaleGestureDetector detector) {
            float mScaleFactor = detector.getScaleFactor();
            float origScale = saveScale;
            saveScale *= mScaleFactor;
            if (saveScale > maxScale) {
                saveScale = maxScale;
                mScaleFactor = maxScale / origScale;
            } else if (saveScale < minScale) {
                saveScale = minScale;
                mScaleFactor = minScale / origScale;
            }

            if (origWidth * saveScale <= viewWidth
                    || origHeight * saveScale <= viewHeight)
                matrix.postScale(mScaleFactor, mScaleFactor, viewWidth / 2,
                        viewHeight / 2);
            else
                matrix.postScale(mScaleFactor, mScaleFactor,
                        detector.getFocusX(), detector.getFocusY());

            mOnScaleListener.onScaleChange(mScaleFactor);

            fixTrans();
            return true;
        }
    }

然后使您的活动或您的其他自定义视图实现该OnScaleListener接口以获取比例值。

请检查此问题以放大自定义视图。