发送/接收.txt文件从Android到PC，而不是整个文件发送

我试图使一个Android应用程序，发送一个。txt文件到我的电脑上的Windows窗体应用程序。问题是，不是整个文件被发送(我还没有能够找出问题是否在发送或接收端)。我只从.txt文件中间的某个地方得到接收方的随机部分。我做错了什么?奇怪的是，它已经完美地工作了几次，但现在我从来没有得到文件的开始或结束。

Android应用程序是用Java编写的，Windows窗体应用程序是用c#编写的。Filepath是我的文件的名称。这里的问题是什么?

Android应用程序代码(发送文件)

//create new byte array with the same length as the file that is to be sent
byte[] array = new byte[(int) filepath.length()];
FileInputStream fileInputStream = new FileInputStream(filepath);
BufferedInputStream bufferedInputStream = new BufferedInputStream(fileInputStream);
//use bufferedInputStream to read to end of file
bufferedInputStream.read(array, 0, array.length);
//create objects for InputStream and OutputStream
//and send the data in array to the server via socket
OutputStream outputStream = socket.getOutputStream();
outputStream.write(array, 0, array.length);

Windows窗体应用程序代码(接收文件)

TcpClient tcpClient = (TcpClient)client;
NetworkStream clientStream = tcpClient.GetStream();
byte[] message = new byte[65535];
int bytesRead;
clientStream.Read(message, 0, message.Length);
System.IO.FileStream fs = System.IO.File.Create(path + dt);
//message has been received
ASCIIEncoding encoder = new ASCIIEncoding();
System.Diagnostics.Debug.WriteLine(encoder.GetString(message, 0, bytesRead));  
fs.Write(message, 0, bytesRead);
fs.Close();

public boolean copyStream(InputStream inputStream, OutputStream outputStream){
    BufferedInputStream bis = new BufferedInputStream(inputStream);
    BufferedOutputStream bos = new BufferedOutputStream(outputStream);
    byte[] buffer = new byte[4*1024]; //Whatever buffersize you want to use.
    try {
        int read;
        while ((read = bis.read(buffer)) != -1){
            bos.write(buffer, 0, read);
        }
        bos.flush();
        bis.close();
        bos.close();
    } catch (IOException e) {
        //Log, retry, cancel, whatever
        return false;
    } 
    return true;
}