question: public static Bitmap decodeSampledBitmapFromResource ( Resources resources , int resId , int reqWidth , int reqHeight ) { final BitmapFactory . Options options = new BitmapFactory . Options ( ) ; options . inJustDecodeBounds = true ; BitmapFactory . decodeResource ( resources , resId , options ) ; options . inSampleSize = calculateInSampleSize ( options , reqWidth , reqHeight ) ; options . inJustDecodeBounds = false ; return BitmapFactory . decodeResource ( resources , resId , options ) ; }
target:  Decode a resource to bitmap width sample size.