在Android系统中缩放图片的代码

public static Drawable resizeImage(Bitmap bitmap, int w, int h) {
 
                // load the origial Bitmap
                Bitmap BitmapOrg = bitmap;
 
                int width = BitmapOrg.getWidth();
                int height = BitmapOrg.getHeight();
                int newWidth = w;
                int newHeight = h;
 
                // calculate the scale
                float scaleWidth = ((float) newWidth) / width;
                float scaleHeight = ((float) newHeight) / height;
 
                // create a matrix for the manipulation
                Matrix matrix = new Matrix();
                // resize the Bitmap
                matrix.postScale(scaleWidth, scaleHeight);
                // if you want to rotate the Bitmap
                // matrix.postRotate(45);
 
                // recreate the new Bitmap
                Bitmap resizedBitmap = Bitmap.createBitmap(BitmapOrg, 0, 0, width,
                                height, matrix, true);
 
                // make a Drawable from Bitmap to allow to set the Bitmap
                // to the ImageView, ImageButton or what ever
                return new BitmapDrawable(resizedBitmap);
 
        }

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