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我已经尝试了一些将视频文件转换为二进制数据格式的过程。但我无法得到它。任何人请帮我解决这个问题，代码如下。在此代码中，我使用文件选项从 sdcard 获取视频文件，在字节数组中，我试图分配从缓冲区中的文件检索到的值，然后显示该字节数组中存在的内容。 

    Button bt=(Button)findViewById(R.id.button1);
    bt.setOnClickListener(new View.OnClickListener() 
    {

        @Override
        public void onClick(View v) 
        {
            // TODO Auto-generated method stub
            File file = new File("/mnt/sdcard/myvideo.mp4");
            FileInputStream objFileIS = null;
            try 
            {
                objFileIS = new FileInputStream(file);
            } 
            catch (FileNotFoundException e) 
            {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            ByteArrayOutputStream objByteArrayOS = new ByteArrayOutputStream();
            byte[] byteBufferString = new byte[1024];
            try 
            {
                for (int readNum; (readNum = objFileIS.read(byteBufferString)) != -1;) 
                {
                 objByteArrayOS.write(byteBufferString, 0, readNum);
                 System.out.println("read " + readNum + " bytes,");
                }
            } 
            catch (IOException e) 
            {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }                    
            byte[] byteBinaryData = Base64.encode((objByteArrayOS.toByteArray()), Base64.DEFAULT);
            String strAttachmentCoded = new String(byteBinaryData);
            System.out.println(strAttachmentCoded);
            Toast.makeText(getApplicationContext(), strAttachmentCoded ,Toast.LENGTH_SHORT).show();     
        }
    });
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