在android中使用Multithreaded将文件拆分成块

Question

我想使用多线程将文件拆分成块，我正在尝试但是，我不知道如何使用多线程代码的正确方法，因为我是多线程的新手。我的主要目标是降低CPU利用率并快速完成文件的拆分。请帮助我如何在我的代码中使用多线程。  提前谢谢。

一些代码

public class ServerSocketThread implements Runnable {

    @Override
    public void run() {
        Socket socket = null;

        try {
            serverSocket = new ServerSocket(SocketServerPORT);
            MainActivity.this.runOnUiThread(new Runnable() {

                @Override
                public void run() {
                    infoPort.setText("I'm waiting here: " + serverSocket.getLocalPort());
                }
            });

          while (true) {
            socket = serverSocket.accept();
            FileTxThread fileTxThread = new FileTxThread(socket);
            fileTxThread.start();
        }

        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            if (socket != null) {
                try {
                    socket.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
    }
}

public class FileTxThread implements Runnable {

    Socket socket;

    FileTxThread(Socket socket) {
        this.socket = socket;
    }

    @Override
    public void run() {
        try {
            BufferedInputStream bis;
            ArrayList<byte[]> al = new ArrayList<byte[]>();

            final int cSize = 64 * 1024;
            File file = new File(Environment.getExternalStorageDirectory(), "test.mp3");
            byte[] bytes = new byte[2048];

            bis = new BufferedInputStream(new FileInputStream(file));
            OutputStream os = socket.getOutputStream();
            int read;

            final double pieces = file.length() / 2048; // used to return file length.
            int fileSize = (int) file.length();
            int readlen = 1024;
            // for (int i = 0; i <= pieces; i++) {
            //        System.out.println("If loop" + i);

            while (fileSize > 0) {
                if (fileSize < 1024) {
                    readlen = fileSize;
                    System.out.println("Hello.........");
                }
                bytes = new byte[readlen];
               read = bis.read(bytes, 0, readlen);
                fileSize -= read;
                al.add(bytes);
            }


            BufferedOutputStream out1 = new BufferedOutputStream(new FileOutputStream(Environment.getExternalStorageDirectory() + "/new.mp3"));

            for (int ii = 1; ii < al.size(); ii++) {
                out1.write(al.get(ii));
                //  out1.flush();
            }
            out1.close();
           File file1 = new File(Environment.getExternalStorageDirectory(), "new.mp3");
            System.out.println("File1 length  output " + file1.length());

谢谢！