贴出代码求大神指点为什么连接上打印机了但就是打印不了，这是因为手机上没装打印机驱动的关系吗？

 private void dayin() {
         try {
            s = new Socket();
            isa = new InetSocketAddress(ip.getText().toString(), Integer.parseInt(port.getText().toString()));
            StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder().detectDiskReads().detectDiskWrites().detectNetwork().penaltyLog().build());
            s.connect(isa, 1000);
//            DataInputStream dis = null;
//            DataOutputStream dos = null;
            if (s.isConnected()) {
                iscontect = true;
                Toast.makeText(MainActivity.this, "连接成功", 1000).show();
                PrintWriter out = new PrintWriter(new BufferedWriter(
                        new OutputStreamWriter(s.getOutputStream(), "GBK")),
                        true);
                /* 纵向放大一倍 */
                out.write(0x1c);
                out.write(0x21);
                out.write(8);

                out.println("\t\t" + "餐厅订单" + "\n");
                String printStr = "交易流水：" + ："111"+
                        "\n" + "商户名称：" + "测试商户" +
                        "\n" + "订单号：" + "24235476"+
                        "\n" + "卡号：" + "548329348"+
                        "\n" + "时间：" + " "+
                        "\n" + "交易金额：" + 1100+
                        "\n" + "**********************************************************";
                out.print(printStr);
//                out.println(print.getText().toString());
                out.println("\n\n");
                //自动切纸
                for (int i = 0; i < getCutPaperByte().length; i++) {
                    out.write(getCutPaperByte()[i]);
                }
                Toast.makeText(MainActivity.this, "打印成功", 1000).show();
                out.close();
            }
        } catch (IOException e) {
            Toast.makeText(MainActivity.this, "连接失败",Toast.LENGTH_LONG).show();
            e.printStackTrace();

         }
    }
    /**切纸命令*/
    public static byte[] getCutPaperByte(){
        byte [] buffer = new byte[5];
        buffer[0]='\n';//命令必须是单行
        buffer[1]=29;
        buffer[2]=86;
        buffer[3]=66;
        buffer[4]=1;
        return buffer;
    }

原文链接：http://www.apkbus.com/blog-682016-60624.html