android无线内网打印机打印出图片

（1）打印机：首先要选择一个连接内网的打印机，内网打印机就是和手机用的同一个网络。

（2）手机：手机必须连接wifi才行。

一个按钮，点击此按钮进行打印操作：button.setOnClickListener(new OnClickListener() {                        @Override                        public void onClick(View v) {                             PrintUtil printUtil = new PrintUtil(context,path);  //context：上下文对象  path:需要打印的图片的路径                        }                   });

PrintUtil:

public class PrintUtil {     public static String IPADDRESS;     public Socket socket;     public static final int POS_OPEN_NETPORT = 9100;     public static String IPADRESS;     public int Net_ReceiveTimeout = 2500;     Context context;     String path;     public PrintUtil(Context context,String path) {          super();          this.context = context;          this.path = path;          IPADDRESS = getIPAddress(context);          RunThread run = new RunThread();          run.start();     }     /*      * 获取当前手机所连wifi的ip地址      */     public static String getIPAddress(Context context) {          NetworkInfo info = ((ConnectivityManager) context                   .getSystemService(Context.CONNECTIVITY_SERVICE))                   .getActiveNetworkInfo();          if (info != null && info.isConnected()) {              if (info.getType() == ConnectivityManager.TYPE_MOBILE) {// 当前使用2G/3G/4G网络                   try {                        for (Enumeration en = NetworkInterface                                  .getNetworkInterfaces(); en.hasMoreElements();) {                             NetworkInterface intf = en.nextElement();                             for (Enumeration enumIpAddr = intf                                       .getInetAddresses(); enumIpAddr                                       .hasMoreElements();) {                                  InetAddress inetAddress = enumIpAddr.nextElement();                                  if (!inetAddress.isLoopbackAddress()                                           && inetAddress instanceof Inet4Address) {                                      return inetAddress.getHostAddress();                                  }                             }                        }                   } catch (SocketException e) {                        e.printStackTrace();                   }              } else if (info.getType() == ConnectivityManager.TYPE_WIFI) {// 当前使用无线网络                   WifiManager wifiManager = (WifiManager) context                             .getSystemService(Context.WIFI_SERVICE);                   WifiInfo wifiInfo = wifiManager.getConnectionInfo();                   String ipAddress = intIP2StringIP(wifiInfo.getIpAddress());// 得到IPV4地址                   return ipAddress;              }          } else {              // 当前无网络连接,请在设置中打开网络          }          return null;     }     /**      * 将得到的int类型的IP转换为String类型,截取ip的前三段      *      * @param ip      * @return      */     public static String intIP2StringIP(int ip) {          return (ip & 0xFF) + "." + ((ip >> 8) & 0xFF) + "."                   + ((ip >> 16) & 0xFF) + ".";     }     ScheduledExecutorService pool;     boolean isFinish;           long lastFinishTime = 0;          boolean isHave = false;     private class RunThread extends Thread{        public RunThread(){        }        @Override        public void run() {            if(pool==null){                pool = Executors.newScheduledThreadPool(100);            }                      for (int i = 2; i < 255; ++i) {     //0~255循环找到打印机ip                final int index = i;                pool.execute(new Runnable() {                    @Override                    public void run() {                        try {                            String ipaddress = IPADDRESS + index;                            NetPrinter printer = new NetPrinter();                            printer.Open(ipaddress, NetPrinter.POS_OPEN_NETPORT);                            if (printer.IFOpen) {   //找到打印机                             isHave = true;                                pos(ipaddress);                                handler.sendEmptyMessage(0);                                return;                            } else{                             if(index == 254 && isHave == false){                                   handler.sendEmptyMessage(1);                             }                            }                        } catch (Exception e) {                             e.printStackTrace();                        }                    }                     });                }        }     }          private Handler handler = new Handler(){          public void handleMessage(Message msg) {              switch (msg.what) {              case 0:                   Toast.makeText(context, "打印完成！", Toast.LENGTH_SHORT).show();                   break;              case 1:                   Toast.makeText(context, "未找到打印机，请确认打印机在同一局域网内，谢谢！", Toast.LENGTH_SHORT).show();                   break;              default:                   break;              }          };     };          private void pos(final String ip) {          // 开启一个子线程          new Thread() {              public void run() {                   try { // 打印机网口IP 打印机端口号 编码方式                        printImage(ip);                   } catch (UnknownHostException e) {                        e.printStackTrace();                        Log.d("tag", "错误信息1：" + e.toString());                   } catch (IOException e) {                        e.printStackTrace();                        Log.d("tag", "错误信息2：" + e.toString());                   }              }          }.start();     }    //根据IP地址使用打印机打印图片     public void printImage(String ip) throws IOException {          DataOutputStream outToServer = null;          Socket clientSocket;          FileInputStream fileInputStream;          try {              fileInputStream = new FileInputStream(path);              InputStream is = fileInputStream;              clientSocket = new Socket(ip, 9100);              outToServer = new DataOutputStream(clientSocket.getOutputStream());              byte[] buffer = new byte[3000];              while (is.read(buffer) != -1) {                   outToServer.write(buffer);                      }              outToServer.flush();          } catch (ConnectException connectException) {                Log.e("msg", connectException.toString(), connectException);          } catch (UnknownHostException e1) {              Log.e("msg", e1.toString(), e1);          } catch (IOException e1) {              Log.e("msg", e1.toString(), e1);          } finally {              outToServer.close();            }     }          public void deleteAll(File file) {        if (file.isFile() || file.list().length == 0) {            file.delete();        } else {            for (File f : file.listFiles()) {                deleteAll(f); // 递归删除每一个文件            }            file.delete(); // 删除文件夹        }    }}

NetPrinter:

public class NetPrinter {    public Socket socket;    private static final String DEBUG_TAG="NetPrinter";    public static final int POS_OPEN_NETPORT = 9100;    public boolean IFOpen = false;    public int Net_ReceiveTimeout = 2500;    //网络打印机 打开网络打印机    public boolean Open(String ipaddress, int netport) {        if (socket == null) {            try {                SocketAddress ipe = new InetSocketAddress(Inet4Address.getByName(ipaddress) ,netport);                Log.e(DEBUG_TAG, Inet4Address.getByName(ipaddress)+"|"+netport);                socket = new Socket();                socket.connect(ipe, Net_ReceiveTimeout);  //2500ms连接时间，连接不上返回false                IFOpen = true;            } catch(Exception e) {                IFOpen = false;            }        } else {            try {                socket.close();                SocketAddress ipe = new InetSocketAddress(Inet4Address.getByName(ipaddress),netport);                Log.e(DEBUG_TAG, Inet4Address.getByName(ipaddress)+"|"+netport);                socket = new Socket();                socket.connect(ipe,Net_ReceiveTimeout);                IFOpen = true;            } catch(Exception e) {                IFOpen = false;            }        }        if(IFOpen){            Close();        }        return IFOpen;    }    //网络打印机 关闭    public void Close() {        try {            socket.close();            socket = null;        } catch(Exception e) {            e.printStackTrace();        }    }}

以上代码就能轻松实现图片的打印，这里我考虑的仅仅只是一台打印机的情况，我这里也只有一台，哈哈。

有什么不足之处请大家指教一下。

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