BitmapFactory.Options options = new BitmapFactory.Options();                     options.inJustDecodeBounds = true;  //获取这个图片的宽和高                     Bitmap bitmap = BitmapFactory.decodeFile(Environment.getExternalStorageDirectory().getAbsolutePath()+ "/darunfa/temp.jpg",options);//此时返回bm为空                     options.inJustDecodeBounds =false;  //计算缩放比                     int be = (int)(options.outWidth / (float)600);  if(be <= 0)                          be = 1;                     options.inSampleSize = be;  //重新读入图片，注意这次要把options.inJustDecodeBounds设为false哦                     bitmap = BitmapFactory.decodeFile(Environment.getExternalStorageDirectory().getAbsolutePath()+ "/darunfa/temp.jpg",options);  int w = bitmap.getWidth();  int h = bitmap.getHeight();                     System.out.println(w+" "+h);                     imageView.setImageBitmap(bitmap);                    File file2= new File(Environment.getExternalStorageDirectory().getAbsolutePath()+ "/darunfa/aaaa.jpg");  try {                      FileOutputStream out = new FileOutputStream(file2);  if(bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out)){                          out.flush();                          out.close();                      }                  } catch (Exception e) {  // TODO: handle exception                  }