BitMap 设置图片大小

  Bitmap bitMap = BitmapFactory.decodeFile(path);
 
  int width = bitMap.getWidth();
 
  int height = bitMap.getHeight();
 
  // 设置想要的大小
 
  int newWidth = 500;
 
  int newHeight = 400;
 
  // 计算缩放比例
 
  float scaleWidth = ((float) newWidth) / width;
 
  float scaleHeight = ((float) newHeight) / height;
 
  // 取得想要缩放的matrix参数
 
  Matrix matrix = new Matrix();
 
  matrix.postScale(scaleWidth, scaleHeight);
 
  // 得到新的图片
 
  bitMap = Bitmap.createBitmap(bitMap, 0, 0, width, height, matrix,
 
  true);