android - 用okhttp3做图片下载，图片下载成功，但本地图片打开时，提示无法打开

Question

主要代码如下，请大神指点：

public File saveFile(Response response, final int id) throws IOException
    {

        InputStream is = null;
        byte[] buf = new byte[2048];
        int len = 0;
        FileOutputStream fos = null;
        try
        {
            is = response.body().byteStream();
            final long total = response.body().contentLength();

            long sum = 0;

            File dir = new File(destFileDir);
            if (!dir.exists())
            {
                dir.mkdirs();
            }
            File file = new File(dir, destFileName);
            fos = new FileOutputStream(file);
            while ((len = is.read(buf)) != -1)
            {
                sum += len;
                fos.write(buf, 0, len);
                final long finalSum = sum;
                OkHttpUtils.getInstance().getDelivery().execute(new Runnable()
                {
                    @Override
                    public void run()
                    {

                        inProgress(finalSum * 1.0f / total,total,id);
                    }
                });
            }
            fos.flush();

            return file;

        }finally {

            try {
                response.body().close();
                if (is != null) is.close();
            } catch (IOException e) {}

            try {
                if (fos != null) fos.close();
            } catch (IOException e) {}

        }

    }

Answer 1

保存沒加後綴名？