public static int[] getImageWH(String path) {
 int[] wh = {-1, -1};
 if (path == null) {
  return wh;
 }
 File file = new File(path);
 if (file.exists() && !file.isDirectory()) {
  try {
   BitmapFactory.Options options = new BitmapFactory.Options();
   options.inJustDecodeBounds = true;
   InputStream is = new FileInputStream(path);
   BitmapFactory.decodeStream(is, null, options);
   wh[0] = options.outWidth;
   wh[1] = options.outHeight;
  }
  catch (Exception e) {
   Log.w(TAG, "getImageWH Exception.", e);
  }
 }
 return wh;
}
 
public static Bitmap createBitmapByScale(String path, int scale) {
 Bitmap bm = null;
 try {
  //获取宽高
  int[] wh = getImageWH(path);
  if (wh[0] == -1 || wh[1] == -1) {
   return null;
  }

  //读取图片
  BitmapFactory.Options options = new BitmapFactory.Options();
  options.inSampleSize = Math.max(wh[0]/scale, wh[1]/scale);
  InputStream is = new FileInputStream(path);
   bm = BitmapFactory.decodeStream(is, null, options);
 }
 catch (Exception e) {
  Log.w(TAG, "createBitmapByScale Exception.", e);
 }
 catch (OutOfMemoryError e) {
  Log.w(TAG, "createBitmapByScale OutOfMemoryError.", e);
  //TODO: out of memory deal..
 }
 return bm;
}