使用BitmapFactory对象测量一个图片的高和宽而不用分配内存

Use Bitmap-factory to measure pic width and height without allocated memory

    BitmapFactory.Options options = new BitmapFactory.Options();  
    options.inJustDecodeBounds = true;  // Don't allocated memory
    BitmapFactory.decodeResource(getResources(), R.id.myimage, options);  
    int imageHeight = options.outHeight;  
    int imageWidth = options.outWidth;  
    String imageType = options.outMimeType;