android开发中项目实现一个图片压缩功能并能指定大小

   private static Bitmap compressByResolution(String imgPath, int w, int h) {  BitmapFactory.Options opts = new BitmapFactory.Options();  opts.inJustDecodeBounds = true;  BitmapFactory.decodeFile(imgPath, opts);  int width = opts.outWidth;  int height = opts.outHeight;  int widthScale = width / w;  int heightScale = height / h;  int scale;  if (widthScale < heightScale) { //保留压缩比例小的   scale = widthScale;  } else {   scale = heightScale;  }  if (scale < 1) {   scale = 1;  }  Log.i(TAG,"图片分辨率压缩比例：" + scale);  opts.inSampleSize = scale;  opts.inJustDecodeBounds = false;  Bitmap bitmap = BitmapFactory.decodeFile(imgPath, opts);  return bitmap; }