Android 将图片转化为缩略图再加载

      stream = new FileInputStream(new File(path+"test.jpg"));

　　BitmapFactory.Options opts = new BitmapFactory.Options();

　　opts.inSampleSize = 8;

　　Bitmap bitmap = BitmapFactory.decodeStream(stream , null, opts);

　　iv.setImageBitmap(bitmap);