我正在将图像文件从服务器端传输到客户端，而在读取图像文件时出现此问题

Question

I am using following code for reading image file from socket. It reads all the bytes from server because size of file on server and android machine are same. When i open this file it does not open the file and generate error that is the file is corrupted or too large.

                public Bitmap fileReceived(InputStream is)
        throws FileNotFoundException, IOException {

        Bitmap bitmap = null;  
        String baseDir = Environment.getExternalStorageDirectory().getAbsolutePath();
        String fileName = "a.png";
        String imageInSD = baseDir + File.separator + fileName;
            System.out.println(imageInSD);
        if (is!= null) {
            FileOutputStream fos = null;
            BufferedOutputStream bos = null;
            try {

                fos = new FileOutputStream(imageInSD);
                bos = new BufferedOutputStream(fos);
                byte[] aByte = new byte[1024];
                int bytesRead;

                while ( true  ) {  
                    bytesRead = is.read(aByte);

                    bos.write(aByte, 0, bytesRead);
                if ( is.available()==0)
                    break;
                }  

                bos.flush();
                bos.close();
          //      is.reset();

        // here it give error i.e --- SkImageDecoder::Factory returned null
               bitmap = BitmapFactory.decodeFile(imageInSD);



            } catch (IOException ex) {
                // Do exception handling
                Log.i("IMSERVICE", "exception ");
            }
        }

        return bitmap;
    }

Answer 1

Don't use available() for this, it won't work reliably!

The docs state:

[ available() ] Returns an estimate of the number of bytes that can be read [...] It is never correct to use the return value of this method to allocate a buffer intended to hold all data in this stream.

Do it like:

while ( (bytesRead = is.read(aByte)) > 0 ) {
    bos.write(aByte, 0, bytesRead);
}