android bitmap的放大缩小

 1 private static Bitmap big(Bitmap bitmap) {
 2   Matrix matrix = new Matrix(); 
 3   matrix.postScale(1.5f,1.5f); //长和宽放大缩小的比例
 4   Bitmap resizeBmp = Bitmap.createBitmap(bitmap,0,0,bitmap.getWidth(),bitmap.getHeight(),matrix,true);
 5   return resizeBmp;
 6  }
 7 
 8  private static Bitmap small(Bitmap bitmap) {
 9   Matrix matrix = new Matrix(); 
10   matrix.postScale(0.8f,0.8f); //长和宽放大缩小的比例
11   Bitmap resizeBmp = Bitmap.createBitmap(bitmap,0,0,bitmap.getWidth(),bitmap.getHeight(),matrix,true);
12   return resizeBmp;
13  }