kotlin 변환 작업

app/build.gradle

@@ -1,6 +1,7 @@
 apply plugin: 'com.android.application'
-
-
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
+apply plugin: 'kotlin-kapt'
 
 android {
     compileSdkVersion 25
@@ -22,10 +23,25 @@ android {
     }
 }
 
+kotlin {
+    experimental {
+        coroutines 'enable'
+    }
+}
+
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
-    compile 'com.android.support:appcompat-v7:25.0.+'
-    compile 'com.android.support:recyclerview-v7:25.0.+'
+    compile 'com.android.support:appcompat-v7:25.3.1'
+    compile 'com.android.support:recyclerview-v7:25.3.1'
+
+    kapt 'com.android.databinding:compiler:3.0.0-alpha6'
+
+    compile 'org.jetbrains.anko:anko-commons:0.10.1'
+    compile 'org.jetbrains.anko:anko-sdk25:0.10.1'
+    compile 'org.jetbrains.anko:anko-sdk25-coroutines:0.10.1'
+
+    compile "org.jetbrains.kotlin:kotlin-stdlib:1.1.3-2"
+
     compile ('io.socket:socket.io-client:0.8.3') {
         exclude group: 'org.json', module: 'json'
     }

app/src/main/java/com/github/nkzawa/socketio/androidchat/ChatApplication.kt

@@ -0,0 +1,17 @@
+package com.github.nkzawa.socketio.androidchat
+
+import android.app.Application
+import io.socket.client.IO
+import io.socket.client.Socket
+
+import java.net.URISyntaxException
+
+class ChatApplication : Application() {
+
+    var socket: Socket = try {
+        IO.socket(Constants.CHAT_SERVER_URL)
+    } catch (e: URISyntaxException) {
+        throw RuntimeException(e)
+    }
+
+}

app/src/main/java/com/github/nkzawa/socketio/androidchat/Constants.kt

@@ -0,0 +1,5 @@
+package com.github.nkzawa.socketio.androidchat
+
+object Constants {
+    const val CHAT_SERVER_URL = "https://socketio-chat.now.sh/"
+}

app/src/main/java/com/github/nkzawa/socketio/androidchat/LoginActivity.kt

@@ -0,0 +1,103 @@
+package com.github.nkzawa.socketio.androidchat
+
+import android.app.Activity
+import android.content.Intent
+import android.os.Bundle
+import android.text.TextUtils
+import android.view.KeyEvent
+import android.view.View
+import android.view.View.OnClickListener
+import android.view.inputmethod.EditorInfo
+import android.widget.Button
+import android.widget.EditText
+import android.widget.TextView
+import io.socket.client.Socket
+import io.socket.emitter.Emitter
+import kotlinx.android.synthetic.main.activity_login.*
+import org.jetbrains.anko.sdk25.coroutines.onClick
+import org.jetbrains.anko.sdk25.coroutines.onEditorAction
+import org.json.JSONException
+import org.json.JSONObject
+
+
+/**
+ * A login screen that offers login via username.
+ */
+class LoginActivity : Activity() {
+
+    private var userName: String? = null
+
+    private lateinit var socket: Socket
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_login)
+
+        val app = application as ChatApplication
+        socket = app.socket
+
+        // Set up the login form.
+        username_input.onEditorAction(returnValue = true) { v, actionId, event ->
+            if (actionId == R.id.login || actionId == EditorInfo.IME_NULL) {
+                attemptLogin()
+            }
+        }
+
+        sign_in_button.onClick { attemptLogin() }
+
+        socket.on("login", onLogin)
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+
+        socket.off("login", onLogin)
+    }
+
+    /**
+     * Attempts to sign in the account specified by the login form.
+     * If there are form errors (invalid username, missing fields, etc.), the
+     * errors are presented and no actual login attempt is made.
+     */
+    private fun attemptLogin() {
+        // Reset errors.
+        username_input.error = null
+
+        // Store values at the time of the login attempt.
+        val username = username_input.text.toString().trim()
+
+        // Check for a valid username.
+        if (username.isNullOrBlank()) {
+            // There was an error; don't attempt login and focus the first
+            // form field with an error.
+            username_input.error = getString(R.string.error_field_required)
+            username_input.requestFocus()
+            return
+        }
+
+        userName = username
+
+        // perform the user login attempt.
+        socket.emit("add user", username)
+    }
+
+    private val onLogin = Emitter.Listener { args ->
+        val data = args[0] as JSONObject
+
+        val numUsers: Int
+        try {
+            numUsers = data.getInt("numUsers")
+        } catch (e: JSONException) {
+            return@Listener
+        }
+
+        val intent = Intent()
+        intent.putExtra("username", userName)
+        intent.putExtra("numUsers", numUsers)
+        setResult(Activity.RESULT_OK, intent)
+        finish()
+    }
+}
+
+
+

app/src/main/java/com/github/nkzawa/socketio/androidchat/MainActivity.kt

@@ -0,0 +1,12 @@
+package com.github.nkzawa.socketio.androidchat
+
+import android.os.Bundle
+import android.support.v7.app.AppCompatActivity
+
+class MainActivity : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+    }
+}