Android 使用url连接上载文件时出现堆大小警告

我正在尝试使用HttpUrlConnection和put方法将一个文件上传到AmazonS3

  outputStream = new DataOutputStream( connection.getOutputStream() );
        bytesAvailable = fileInputStream.available();
        int current = 0;
        bufferSize = Math.min(bytesAvailable, maxBufferSize);
        buffer = new byte[bufferSize];

        // Read file
        bytesRead = fileInputStream.read(buffer, 0, bufferSize);

        while (bytesRead > 0)
       {
            outputStream.write(buffer, 0, bufferSize);
            bytesAvailable = fileInputStream.available();
            bufferSize = Math.min(bytesAvailable, maxBufferSize);
            bytesRead = fileInputStream.read(buffer, 0, bufferSize);
            current+=bytesRead;
        }

这是使用缓冲区输出数据的正确方法吗？这一切都适用于较小的文件，但当我试图上传较大的文件时，它会说

02-11 19:04:38.718: INFO/dalvikvm-heap(15385): Grow heap (frag case) to 9.204MB for 3143696-byte allocation

我做错了什么？ 非常感谢您的帮助，谢谢