[Android程式範例] 利用Matrix類別對Bitmap圖片放大或縮小

public class ScalePhoto {

 public ScalePhoto() {
  // TODO Auto-generated constructor stub
 }

 public static Bitmap scale(Bitmap input,int width, int height)
 {
  int w = input.getWidth();
  int h = input.getHeight();
  Matrix matrix = new Matrix();
  float scaleWidth = ((float) width / w);
  float scaleHeight = ((float) height / h);
  matrix.postScale(scaleWidth, scaleHeight);
  return Bitmap.createBitmap(input, 0, 0, w, h, matrix, true);
 }
}