Android Wifi Printing Example Code With Actual Printer Device

How to send data through wifi in android programmatically?

This example demonstrate most ship data through wifi in android programmatically

Need Server and Client Project

Server

Step 1
− Create a new project in Android Studio, go to File ⇒ New Projection and fill all required details to create a new project.

Footstep ii
− Add the post-obit code to res/layout/activity_main.xml.

<?xml version = "1.0" encoding = "utf-8"?> <RelativeLayout xmlns:android = "http://schemas.android.com/apk/res/android"    xmlns:tools = "http://schemas.android.com/tools"    android:layout_width = "match_parent"    android:layout_height = "match_parent"    android:layout_margin = "16dp"    tools:context = ".MainActivity">    <TextView       android:id = "@+id/tvIP"       android:layout_width = "wrap_content"       android:layout_height = "wrap_content"       android:textAppearance = "@manner/Base.TextAppearance.AppCompat.Medium" />    <TextView       android:id = "@+id/tvPort"       android:layout_width = "wrap_content"       android:layout_height = "wrap_content"       android:layout_below = "@+id/tvIP"       android:textAppearance = "@style/Base of operations.TextAppearance.AppCompat.Medium" />    <TextView       android:id = "@+id/tvConnectionStatus"       android:layout_width = "match_parent"       android:layout_height = "wrap_content"       android:layout_below = "@+id/tvPort"       android:textAppearance = "@mode/Base of operations.TextAppearance.AppCompat.Medium" />    <TextView       android:id = "@+id/tvMessages"       android:layout_width = "match_parent"       android:layout_height = "wrap_content"       android:layout_above = "@+id/etMessage"       android:layout_below = "@+id/tvConnectionStatus"       android:inputType = "textMultiLine"       android:textAppearance = "@style/Base.TextAppearance.AppCompat.Medium" />    <EditText       android:id = "@+id/etMessage"       android:layout_width = "match_parent"       android:layout_height = "wrap_content"       android:layout_above = "@+id/btnSend"       android:hint = "Enter Bulletin"       android:inputType = "text" />    <Push       android:id = "@+id/btnSend"       android:layout_width = "match_parent"       android:layout_height = "wrap_content"       android:layout_alignParentBottom = "true"       android:text = "Ship" /> </RelativeLayout>

Step 3
− Add the following lawmaking to src/MainActivity.java

packet com.server.myapplication.server;  import android.note.SuppressLint; import android.net.wifi.WifiInfo; import android.internet.wifi.WifiManager; import android.os.Packet; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import coffee.io.PrintWriter; import java.net.InetAddress; import java.net.ServerSocket; import coffee.net.Socket; import java.net.UnknownHostException; import java.nio.ByteBuffer; import java.nio.ByteOrder;  @SuppressLint("SetTextI18n") public grade MainActivity extends AppCompatActivity {    ServerSocket serverSocket;    Thread Thread1 = cipher;    TextView tvIP, tvPort;    TextView tvMessages;    EditText etMessage;    Button btnSend;    public static Cord SERVER_IP = "";    public static final int SERVER_PORT = 8080;    String message;    @Override    protected void onCreate(Parcel savedInstanceState) {       super.onCreate(savedInstanceState);       setContentView(R.layout.activity_main);       tvIP = findViewById(R.id.tvIP);       tvPort = findViewById(R.id.tvPort);       tvMessages = findViewById(R.id.tvMessages);       etMessage = findViewById(R.id.etMessage);       btnSend = findViewById(R.id.btnSend);       try {          SERVER_IP = getLocalIpAddress();       } grab (UnknownHostException due east) {          eastward.printStackTrace();       }       Thread1 = new Thread(new Thread1());       Thread1.offset();       btnSend.setOnClickListener(new View.OnClickListener() {          @Override          public void onClick(View v) {             message = etMessage.getText().toString().trim();             if (!message.isEmpty()) {                new Thread(new Thread3(message)).first();             }          }       });    }    private Cord getLocalIpAddress() throws UnknownHostException {       WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(WIFI_SERVICE);       affirm wifiManager ! = null;       WifiInfo wifiInfo = wifiManager.getConnectionInfo();       int ipInt = wifiInfo.getIpAddress();       return InetAddress.getByAddress(ByteBuffer.classify(4).gild(ByteOrder.LITTLE_ENDIAN).putInt(ipInt).array()).getHostAddress();    }    individual PrintWriter output;    individual BufferedReader input;    class Thread1 implements Runnable {       @Override       public void run() {          Socket socket;          endeavor {             serverSocket = new ServerSocket(SERVER_PORT);             runOnUiThread(new Runnable() {                @Override                public void run() {                   tvMessages.setText("Not continued");                   tvIP.setText("IP: " + SERVER_IP);                   tvPort.setText("Port: " + String.valueOf(SERVER_PORT));                }             });             effort {                socket = serverSocket.accept();                output = new PrintWriter(socket.getOutputStream());                input = new BufferedReader(new InputStreamReader(socket.getInputStream()));                runOnUiThread(new Runnable() {                   @Override                   public void run() {                      tvMessages.setText("Connected\n");                   }                });                new Thread(new Thread2()).get-go();             } grab (IOException eastward) {                east.printStackTrace();             }          } catch (IOException e) {             e.printStackTrace();          }       }    }    private course Thread2 implements Runnable {       @Override       public void run() {          while (true) {             try {                final Cord bulletin = input.readLine();                if (bulletin ! = zip) {                   runOnUiThread(new Runnable() {                      @Override                      public void run() {                         tvMessages.append("client:" + message + "\n");                      }                   });                } else {                   Thread1 = new Thread(new Thread1());                   Thread1.start();                   render;                }             } grab (IOException due east) {                e.printStackTrace();             }          }       }    }    course Thread3 implements Runnable {       private String message;       Thread3(String message) {          this.message = bulletin;       }       @Override       public void run() {          output.write(message);          output.flush();          runOnUiThread(new Runnable() {             @Override             public void run() {                tvMessages.suspend("server: " + bulletin + "\due north");                etMessage.setText("");             }          });       }    } }

Step 4
− Add the following code to androidManifest.xml

<?xml version = "one.0" encoding = "utf-8"?> <manifest xmlns:android = "http://schemas.android.com/apk/res/android"    package = "com.example.myapplication">    <uses-permission android:name = "android.permission.ACCESS_WIFI_STATE" />    <uses-permission android:name = "android.permission.ACCESS_NETWORK_STATE" />    <uses-permission android:name = "android.permission.INTERNET"/>    <awarding       android:allowBackup = "true"       android:icon = "@mipmap/ic_launcher"       android:characterization = "@cord/app_name"       android:roundIcon = "@mipmap/ic_launcher_round"       android:supportsRtl = "true"       android:theme = "@style/AppTheme">       <action android:name = ".MainActivity" android:label = "Server">          <intent-filter>             <action android:name = "android.intent.action.Primary" />             <category android:name = "android.intent.category.LAUNCHER" />          </intent-filter>       </activity>    </awarding> </manifest>

Customer

Step ane
− Create a new projection in Android Studio, go to File ⇒ New Projection and fill all required details to create a new project.

Read: Cara Menginstal Printer Epson L360 Tanpa Menggunakan Cd

Footstep 2
− Add the following code to res/layout/activity_main.xml.

<?xml version = "1.0" encoding = "utf-8"?> <RelativeLayout xmlns:android = "http://schemas.android.com/apk/res/android"    xmlns:tools = "http://schemas.android.com/tools"    android:layout_width = "match_parent"    android:layout_height = "match_parent"    android:layout_margin = "16dp"    tools:context = ".MainActivity">    <EditText       android:id = "@+id/etIP"       android:layout_width = "match_parent"       android:layout_height = "wrap_content"       android:hint = "IP-Address"       android:inputType = "text" />    <EditText       android:id = "@+id/etPort"       android:layout_width = "match_parent"       android:layout_height = "wrap_content"       android:layout_below = "@+id/etIP"       android:hint = "Port No"       android:inputType = "number" />    <Push button       android:id = "@+id/btnConnect"       android:layout_width = "match_parent"       android:layout_height = "wrap_content"       android:layout_below = "@+id/etPort"       android:layout_gravity = "center"       android:layout_marginTop = "16dp"       android:text = "Connect To Server" />    <TextView       android:id = "@+id/tvMessages"       android:layout_width = "match_parent"       android:layout_height = "wrap_content"       android:layout_above = "@+id/etMessage"       android:layout_below = "@+id/btnConnect"       android:inputType = "textMultiLine"       android:textAppearance = "@style/Base.TextAppearance.AppCompat.Medium" />    <EditText       android:id = "@+id/etMessage"       android:layout_width = "match_parent"       android:layout_height = "wrap_content"       android:layout_above = "@+id/btnSend"       android:hint = "Enter Message"       android:inputType = "text" />    <Button       android:id = "@+id/btnSend"       android:layout_width = "match_parent"       android:layout_height = "wrap_content"       android:layout_alignParentBottom = "truthful"       android:text = "SEND" /> </RelativeLayout>

Step 3
− Add together the post-obit code to res/layout/MainActivity.java.

package com.client.myapplication.client;  import android.annotation.SuppressLint; import android.os.Package; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import coffee.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintWriter; import java.net.Socket;  @SuppressLint("SetTextI18n") public class MainActivity extends AppCompatActivity {    Thread Thread1 = null;    EditText etIP, etPort;    TextView tvMessages;    EditText etMessage;    Button btnSend;    String SERVER_IP;    int SERVER_PORT;    @Override    protected void onCreate(Bundle savedInstanceState) {       super.onCreate(savedInstanceState);       setContentView(R.layout.activity_main);       etIP = findViewById(R.id.etIP);       etPort = findViewById(R.id.etPort);       tvMessages = findViewById(R.id.tvMessages);       etMessage = findViewById(R.id.etMessage);       btnSend = findViewById(R.id.btnSend);       Push button btnConnect = findViewById(R.id.btnConnect);       btnConnect.setOnClickListener(new View.OnClickListener() {          @Override          public void onClick(View 5) {             tvMessages.setText("");             SERVER_IP = etIP.getText().toString().trim();             SERVER_PORT = Integer.parseInt(etPort.getText().toString().trim());             Thread1 = new Thread(new Thread1());             Thread1.start();          }       });       btnSend.setOnClickListener(new View.OnClickListener() {          @Override          public void onClick(View v) {             String message = etMessage.getText().toString().trim();             if (!bulletin.isEmpty()) {                new Thread(new Thread3(bulletin)).outset();             }          }       });    }    private PrintWriter output;    private BufferedReader input;    form Thread1 implements Runnable {       @Override       public void run() {          Socket socket;          try {             socket = new Socket(SERVER_IP, SERVER_PORT);             output = new PrintWriter(socket.getOutputStream());             input = new BufferedReader(new InputStreamReader(socket.getInputStream()));             runOnUiThread(new Runnable() {                @Override                public void run() {                   tvMessages.setText("Connected\due north");                }             });             new Thread(new Thread2()).showtime();          } catch (IOException eastward) {             eastward.printStackTrace();          }       }    }    class Thread2 implements Runnable {       @Override       public void run() {          while (true) {             effort {                final String message = input.readLine();                if (message ! = null) {                   runOnUiThread(new Runnable() {                      @Override                      public void run() {                         tvMessages.append("server: " + message + "\northward");                      }                   });                } else {                   Thread1 = new Thread(new Thread1());                   Thread1.start();                   return;                }             } catch (IOException e) {                due east.printStackTrace();             }          }       }    }    course Thread3 implements Runnable {       private Cord message;       Thread3(String message) {          this.message = message;       }       @Override       public void run() {          output.write(message);          output.affluent();          runOnUiThread(new Runnable() {             @Override             public void run() {                tvMessages.suspend("client: " + message + "\n");                etMessage.setText("");             }          });       }    } }

Pace 4
− Add together the following code to androidManifest.xml

<?xml version = "1.0" encoding = "utf-eight"?> <manifest xmlns:android = "http://schemas.android.com/apk/res/android"    packet = "com.client.myapplication.client">    <uses-permission android:name = "android.permission.INTERNET" />    <uses-permission android:name = "android.permission.ACCESS_NETWORK_STATE" />    <awarding       android:allowBackup = "true"       android:icon = "@mipmap/ic_launcher"       android:label = "@cord/app_name"       android:roundIcon = "@mipmap/ic_launcher_round"       android:supportsRtl = "true"       android:theme = "@mode/AppTheme">       <activity          android:proper noun = "com.client.myapplication.customer.MainActivity"          android:label = "Client">          <intent-filter>             <activeness android:proper noun = "android.intent.activity.Main" />             <category android:proper noun = "android.intent.category.LAUNCHER" />          </intent-filter>       </action>    </application> </manifest>

Let’due south try to run your both server and client application. I assume you have connected your actual Android Mobile device with your reckoner. To run the app from android studio, open one of your project’southward action files and click Run icon from the toolbar. Select your mobile device as an selection and and then check your mobile device which will display your default screen –