init

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+

app/.gitignore

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+/build

app/build.gradle

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+apply plugin: 'com.android.application'
+
+apply plugin: 'kotlin-android'
+
+apply plugin: 'kotlin-android-extensions'
+
+android {
+    compileSdkVersion 29
+    buildToolsVersion "29.0.0"
+    defaultConfig {
+        applicationId "uz.anor.clientserver"
+        minSdkVersion 21
+        targetSdkVersion 29
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    implementation 'androidx.appcompat:appcompat:1.0.2'
+    implementation 'androidx.core:core-ktx:1.0.2'
+    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'androidx.test:runner:1.2.0'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

app/src/androidTest/java/uz/anor/clientserver/ExampleInstrumentedTest.kt

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+package uz.anor.clientserver
+
+import androidx.test.InstrumentationRegistry
+import androidx.test.runner.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getTargetContext()
+        assertEquals("uz.anor.clientserver", appContext.packageName)
+    }
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="uz.anor.clientserver">
+
+    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
+    <uses-permission android:name="android.permission.INTERNET"/>
+    <uses-permission android:name = "android.permission.ACCESS_NETWORK_STATE" />
+    <application
+            android:allowBackup="true"
+            android:icon="@mipmap/ic_launcher"
+            android:label="@string/app_name"
+            android:roundIcon="@mipmap/ic_launcher_round"
+            android:supportsRtl="true"
+            android:theme="@style/AppTheme">
+        <activity android:name=".MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+        <activity android:name=".Server"/>
+        <activity android:name=".Client"/>
+        <activity android:name=".ServerActivity"/>
+        <activity android:name=".ClientActivity"/>
+    </application>
+
+</manifest>

app/src/main/java/uz/anor/clientserver/Client.kt

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+package uz.anor.clientserver
+
+import android.content.Context
+import android.graphics.Color
+import android.net.nsd.NsdManager
+import android.net.nsd.NsdServiceInfo
+import android.os.Bundle
+import android.os.Handler
+import android.util.Log
+import android.view.View
+import android.widget.EditText
+import android.widget.LinearLayout
+import android.widget.TextView
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.content.ContextCompat
+import java.io.*
+import java.net.InetAddress
+import java.net.Socket
+import java.net.UnknownHostException
+import java.text.SimpleDateFormat
+import java.util.*
+
+class Client : AppCompatActivity(), View.OnClickListener {
+    private val TAG = "MRX"
+    private var clientThread: ClientThread? = null
+    private var thread: Thread? = null
+    private var handler: Handler? = null
+
+
+    private val SERVICE_NAME = "Client Device"
+    private val SERVICE_TYPE = "_http._tcp."
+
+    private var hostAddress: InetAddress? = null
+    private var hostPort: Int = 0
+    private var mNsdManager: NsdManager? = null
+    private var clientTextColor: Int = 0
+    private var msgList: LinearLayout? = null
+    private var edMessage: EditText? = null
+
+    internal var mDiscoveryListener: NsdManager.DiscoveryListener = object : NsdManager.DiscoveryListener {
+
+        // Called as soon as service discovery begins.
+        override fun onDiscoveryStarted(regType: String) {
+            Log.d(TAG, "Service discovery started")
+        }
+
+        override fun onServiceFound(service: NsdServiceInfo) {
+            // A service was found! Do something with it.
+            Log.d(TAG, "Service discovery success : $service")
+            Log.d(TAG, "Host = " + service.serviceName)
+            Log.d(TAG, "port = " + service.port.toString())
+
+            if (service.serviceType != SERVICE_TYPE) {
+                // Service type is the string containing the protocol and
+                // transport layer for this service.
+                Log.d(TAG, "Unknown Service Type: " + service.serviceType)
+            } else if (service.serviceName == SERVICE_NAME) {
+                // The name of the service tells the user what they'd be
+                // connecting to. It could be "Bob's Chat App".
+                Log.d(TAG, "Same machine: $SERVICE_NAME")
+            } else {
+                Log.d(TAG, "Diff Machine : " + service.serviceName)
+                // connect to the service and obtain serviceInfo
+
+                mNsdManager!!.resolveService(service, object : NsdManager.ResolveListener {
+
+                    override fun onResolveFailed(nsdServiceInfo: NsdServiceInfo, errorCode: Int) {
+                        Log.e(TAG, "Resolve failed $errorCode")
+                        Log.e(TAG, "serivce = $nsdServiceInfo")
+                    }
+
+                    override fun onServiceResolved(serviceInfo: NsdServiceInfo) {
+                        Log.d(TAG, "Resolve Succeeded. $serviceInfo")
+
+                        if (serviceInfo.serviceName == SERVICE_NAME) {
+                            Log.d(TAG, "Same IP.")
+                            return
+                        }
+
+                        // Obtain port and IP
+                        hostPort = serviceInfo.port
+                        hostAddress = serviceInfo.host
+                        Log.d(TAG, "hostPort=$hostPort")
+                        Log.d(TAG, "hostAddess=" + hostAddress!!)
+                        if (serviceInfo.serviceName.equals(Server.SERVICE_NAME) && serviceInfo.serviceType.equals(Server.SERVICE_TYPE))
+                            SERVER_IP = hostAddress!!.hostAddress
+
+                    }
+                })
+            }
+        }
+
+        override fun onServiceLost(service: NsdServiceInfo) {
+            // When the network service is no longer available.
+            // Internal bookkeeping code goes here.
+            Log.e(TAG, "service lost$service")
+        }
+
+        override fun onDiscoveryStopped(serviceType: String) {
+            Log.i(TAG, "Discovery stopped: $serviceType")
+        }
+
+        override fun onStartDiscoveryFailed(serviceType: String, errorCode: Int) {
+            Log.e(TAG, "Discovery failed: Error code:$errorCode")
+            mNsdManager!!.stopServiceDiscovery(this)
+        }
+
+        override fun onStopDiscoveryFailed(serviceType: String, errorCode: Int) {
+            Log.e(TAG, "Discovery failed: Error code:$errorCode")
+            mNsdManager!!.stopServiceDiscovery(this)
+        }
+    }
+
+    internal val time: String
+        get() {
+            val sdf = SimpleDateFormat("HH:mm:ss")
+            return sdf.format(Date())
+        }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.ac_client)
+
+        title = "Client"
+        clientTextColor = ContextCompat.getColor(this, R.color.green)
+        msgList = findViewById(R.id.msgList)
+        edMessage = findViewById(R.id.edMessage)
+
+        handler = Handler()
+        mNsdManager = getSystemService(Context.NSD_SERVICE) as NsdManager
+        //        mNsdManager.discoverServices(SERVICE_TYPE,
+        //                NsdManager.PROTOCOL_DNS_SD, mDiscoveryListener);
+    }
+
+    override fun onPause() {
+        if (mNsdManager != null) {
+            mNsdManager!!.stopServiceDiscovery(mDiscoveryListener)
+        }
+        super.onPause()
+    }
+
+    override fun onResume() {
+        super.onResume()
+        if (mNsdManager != null) {
+            mNsdManager!!.discoverServices(
+                SERVICE_TYPE, NsdManager.PROTOCOL_DNS_SD, mDiscoveryListener
+            )
+        }
+
+    }
+    //////////////////////////////////////////////
+
+    fun textView(message: String?, color: Int): TextView {
+        var message = message
+        if (null == message || message.trim { it <= ' ' }.isEmpty()) {
+            message = "<Empty Message>"
+        }
+        val tv = TextView(this)
+        tv.setTextColor(color)
+        tv.text = "$message [$time]"
+        tv.textSize = 20f
+        tv.setPadding(0, 5, 0, 0)
+        return tv
+    }
+
+    fun showMessage(message: String, color: Int) {
+        handler!!.post { msgList!!.addView(textView(message, color)) }
+    }
+
+    override fun onClick(view: View) {
+
+        if (view.id == R.id.connect_server) {
+            msgList!!.removeAllViews()
+            showMessage("Connecting to Server...", clientTextColor)
+            clientThread = ClientThread()
+            thread = Thread(clientThread)
+            thread!!.start()
+            showMessage("Connected to Server...", clientTextColor)
+            return
+        }
+
+        if (view.id == R.id.send_data) {
+            val clientMessage = edMessage!!.text.toString().trim { it <= ' ' }
+            showMessage(clientMessage, Color.BLUE)
+            if (null != clientThread) {
+                clientThread!!.sendMessage(clientMessage)
+            }
+        }
+    }
+
+    internal inner class ClientThread : Runnable {
+
+        private var socket: Socket? = null
+        private var input: BufferedReader? = null
+
+        override fun run() {
+
+            try {
+                val serverAddr = InetAddress.getByName(SERVER_IP)
+                socket = Socket(serverAddr, SERVERPORT)
+
+                while (!Thread.currentThread().isInterrupted) {
+
+                    this.input = BufferedReader(InputStreamReader(socket!!.getInputStream()))
+                    var message: String? = input!!.readLine()
+                    if (null == message || "Disconnect".contentEquals(message)) {
+                        Thread.interrupted()
+                        message = "Server Disconnected."
+                        showMessage(message, Color.RED)
+                        break
+                    }
+                    showMessage("Server: $message", clientTextColor)
+                }
+
+            } catch (e1: UnknownHostException) {
+                e1.printStackTrace()
+            } catch (e1: IOException) {
+                e1.printStackTrace()
+            }
+
+        }
+
+        fun sendMessage(message: String) {
+            Thread(Runnable {
+                try {
+                    if (null != socket) {
+                        val out = PrintWriter(
+                            BufferedWriter(
+                                OutputStreamWriter(socket!!.getOutputStream())
+                            ),
+                            true
+                        )
+                        out.println(message)
+                    }
+                } catch (e: Exception) {
+                    e.printStackTrace()
+                }
+            }).start()
+        }
+
+    }
+
+    override fun onDestroy() {
+        //        if (mNsdManager != null) {
+        //            mNsdManager.stopServiceDiscovery(mDiscoveryListener);
+        //        }
+        super.onDestroy()
+        if (null != clientThread) {
+            clientThread!!.sendMessage("Disconnect")
+            clientThread = null
+        }
+    }
+
+    companion object {
+
+        val SERVERPORT = 3003
+
+        var SERVER_IP = "192.168.0.189"
+    }
+}