updated with build tools 25, gradle 3.3, changed chat server to

https://socketio-chat.now.sh/ using info from
socketio/socket.io#2823

app/build.gradle

@@ -3,7 +3,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:1.2.3'
+        classpath 'com.android.tools.build:gradle:2.3.0-beta4'
     }
 }
 apply plugin: 'com.android.application'
@@ -13,12 +13,12 @@ repositories {
 }
 
 android {
-    compileSdkVersion 21
-    buildToolsVersion "21.1.2"
+    compileSdkVersion 25
+    buildToolsVersion "25.0.2"
     defaultConfig {
         applicationId 'com.github.nkzawa.socketio.androidchat'
-        minSdkVersion 15
-        targetSdkVersion 21
+        minSdkVersion 17
+        targetSdkVersion 25
         versionCode 1
         versionName "1.0"
     }
@@ -34,8 +34,8 @@ android {
 
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
-    compile 'com.android.support:appcompat-v7:21.0.+'
-    compile 'com.android.support:recyclerview-v7:21.0.+'
+    compile 'com.android.support:appcompat-v7:25.0.+'
+    compile 'com.android.support:recyclerview-v7:25.0.+'
     compile ('io.socket:socket.io-client:0.8.1') {
         exclude group: 'org.json', module: 'json'
     }

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

@@ -1,18 +1,20 @@
 package com.github.nkzawa.socketio.androidchat;
 
 import android.app.Application;
-import io.socket.client.IO;
-import io.socket.client.Socket;
 
 import java.net.URISyntaxException;
 
+import io.socket.client.IO;
+import io.socket.client.Socket;
+
 public class ChatApplication extends Application {
 
     private Socket mSocket;
     {
         try {
             mSocket = IO.socket(Constants.CHAT_SERVER_URL);
         } catch (URISyntaxException e) {
+            e.printStackTrace();
             throw new RuntimeException(e);
         }
     }

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

@@ -1,5 +1,6 @@
 package com.github.nkzawa.socketio.androidchat;
 
 public class Constants {
-    public static final String CHAT_SERVER_URL = "http://chat.socket.io";
+    //public static final String CHAT_SERVER_URL = "http://chat.socket.io";
+    public static final String CHAT_SERVER_URL = "https://socketio-chat.now.sh";
 }

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

@@ -4,24 +4,29 @@
 import android.content.Intent;
 import android.os.Bundle;
 import android.text.TextUtils;
+import android.util.Log;
 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 org.json.JSONException;
 import org.json.JSONObject;
 
+import io.socket.client.Socket;
+import io.socket.emitter.Emitter;
+
 
 /**
  * A login screen that offers login via username.
  */
 public class LoginActivity extends Activity {
 
+    private static final String TAG = "LoginActivity";
+
     private EditText mUsernameView;
 
     private String mUsername;
@@ -58,13 +63,15 @@ public void onClick(View view) {
         });
 
         mSocket.on("login", onLogin);
+        mSocket.on("error", onError);
     }
 
     @Override
     protected void onDestroy() {
         super.onDestroy();
 
         mSocket.off("login", onLogin);
+        mSocket.off("error", onError);
     }
 
     /**
@@ -113,6 +120,16 @@ public void call(Object... args) {
             finish();
         }
     };
+
+    private Emitter.Listener onError = new Emitter.Listener() {
+        @Override
+        public void call(Object... args) {
+            Object [] myArgs = args;
+            // don't understand enough about what is expected in args to print something more useful here.
+            // will do that as I know more.
+            Log.e(TAG,"Got an error");
+        }
+    };
 }
 
 

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

@@ -1,10 +1,10 @@
 package com.github.nkzawa.socketio.androidchat;
 
 import android.os.Bundle;
-import android.support.v7.app.ActionBarActivity;
+import android.support.v7.app.AppCompatActivity;
 
 
-public class MainActivity extends ActionBarActivity {
+public class MainActivity extends AppCompatActivity {
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {

build.gradle

@@ -5,7 +5,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:1.2.3'
+        classpath 'com.android.tools.build:gradle:2.3.0-beta4'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files

gradle.properties

@@ -15,4 +15,6 @@
 # When configured, Gradle will run in incubating parallel mode.
 # This option should only be used with decoupled projects. More details, visit
 # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
-# org.gradle.parallel=true
+# org.gradle.parallel=true
+
+org.gradle.jvmargs=-Xmx1536M

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Wed Dec 23 22:20:48 JST 2015
+#Sun Feb 19 12:41:28 PST 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip