Android中缩放图片的一个方法

01	public static Drawable resizeImage(Bitmap bitmap, int w, int h) {

02

03	// load the origial Bitmap

04	Bitmap BitmapOrg = bitmap;

05

06	int width = BitmapOrg.getWidth();

07	int height = BitmapOrg.getHeight();

08	int newWidth = w;

09	int newHeight = h;

10

11	// calculate the scale

12	float scaleWidth = ((float) newWidth) / width;

13	float scaleHeight = ((float) newHeight) / height;

14

15	// create a matrix for the manipulation

16	Matrix matrix = new Matrix();

17	// resize the Bitmap

18	matrix.postScale(scaleWidth, scaleHeight);

19	// if you want to rotate the Bitmap

20	// matrix.postRotate(45);

21

22	// recreate the new Bitmap

23	Bitmap resizedBitmap = Bitmap.createBitmap(BitmapOrg, 0, 0, width,

24	height, matrix, true);

25

26	// make a Drawable from Bitmap to allow to set the Bitmap

27	// to the ImageView, ImageButton or what ever

28	return new BitmapDrawable(resizedBitmap);

29

30

}