PhotoViewAttacher.java 文件源码

/**
 * Set's the ImageView's ScaleType to Matrix.
 */
private static void setImageViewScaleTypeMatrix(ImageView imageView) {
    if (null != imageView) {
        if (imageView instanceof PhotoView) {
            /**
             * PhotoView sets it's own ScaleType to Matrix, then diverts all
             * calls setScaleType to this.setScaleType. Basically we don't
             * need to do anything here
             */
            imageView.setScaleType(ScaleType.CENTER);
        } else {
            imageView.setScaleType(ScaleType.MATRIX);
        }
    }
}