This is basic chat app using firebase

Author: ashishyadav400

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/workspace.xml
+/.idea/libraries
+.DS_Store
+/build
+/captures

.idea/compiler.xml

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+/build

.idea/copyright/profiles_settings.xml

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+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 23
+    buildToolsVersion "24.0.1"
+
+    defaultConfig {
+        applicationId "com.androidchatapp"
+        minSdkVersion 14
+        targetSdkVersion 23
+        versionCode 1
+        versionName "1.0"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    compile fileTree(dir: 'libs', include: ['*.jar'])
+    testCompile 'junit:junit:4.12'
+    compile 'com.android.support:appcompat-v7:23.4.0'
+    compile 'com.firebase:firebase-client-android:2.5.2+'
+    compile 'com.android.volley:volley:1.0.0'
+    //add library
+    compile 'gr.pantrif:easy-android-splash-screen:0.0.1'
+}

.idea/encodings.xml

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+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in D:\Users\TCP\AppData\Local\Android\Sdk/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the proguardFiles
+# directive in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# 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 *;
+#}

.idea/gradle.xml

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+package com.androidchatapp;
+
+import android.app.Application;
+import android.test.ApplicationTestCase;
+
+/**
+ * <a href="http://d.android.com/tools/testing/testing_android.html">Testing Fundamentals</a>
+ */
+public class ApplicationTest extends ApplicationTestCase<Application> {
+    public ApplicationTest() {
+        super(Application.class);
+    }
+}

.idea/misc.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.androidchatapp">
+
+    <uses-permission android:name="android.permission.INTERNET" />
+
+    <application
+        android:allowBackup="true"
+        android:icon="@drawable/logo"
+        android:label="@string/app_name"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme">
+        <activity android:name=".SplashScreen">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+        <activity android:name=".Login">
+        <activity android:name=".Register" />
+        <activity android:name=".Users" />
+        <activity android:name=".Chat" />
+        </activity>
+    </application>
+
+</manifest>

.idea/modules.xml

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+package com.androidchatapp;
+
+import android.support.v7.app.AppCompatActivity;
+import android.os.Bundle;
+import android.view.Gravity;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.EditText;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
+import android.widget.RelativeLayout;
+import android.widget.ScrollView;
+import android.widget.TextView;
+
+import com.firebase.client.ChildEventListener;
+import com.firebase.client.DataSnapshot;
+import com.firebase.client.Firebase;
+import com.firebase.client.FirebaseError;
+
+import java.util.HashMap;
+import java.util.Map;
+
+
+public class Chat extends AppCompatActivity {
+    LinearLayout layout;
+    RelativeLayout layout_2;
+    ImageView sendButton;
+    EditText messageArea;
+    ScrollView scrollView;
+    Firebase reference1, reference2;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_chat);
+
+        layout = (LinearLayout) findViewById(R.id.layout1);
+        layout_2 = (RelativeLayout)findViewById(R.id.layout2);
+        sendButton = (ImageView)findViewById(R.id.sendButton);
+        messageArea = (EditText)findViewById(R.id.messageArea);
+        scrollView = (ScrollView)findViewById(R.id.scrollView);
+
+        Firebase.setAndroidContext(this);
+        reference1 = new Firebase("https://rtchat-6d4d7.firebaseio.com/messages/" + UserDetails.username + "_" + UserDetails.chatWith);
+        reference2 = new Firebase("https://rtchat-6d4d7.firebaseio.com/messages/" + UserDetails.chatWith + "_" + UserDetails.username);
+
+        sendButton.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                String messageText = messageArea.getText().toString();
+
+                if(!messageText.equals("")){
+                    Map<String, String> map = new HashMap<String, String>();
+                    map.put("message", messageText);
+                    map.put("user", UserDetails.username);
+                    reference1.push().setValue(map);
+                    reference2.push().setValue(map);
+                    messageArea.setText("");
+                }
+            }
+        });
+
+        reference1.addChildEventListener(new ChildEventListener() {
+            @Override
+            public void onChildAdded(DataSnapshot dataSnapshot, String s) {
+                Map map = dataSnapshot.getValue(Map.class);
+                String message = map.get("message").toString();
+                String userName = map.get("user").toString();
+
+                if(userName.equals(UserDetails.username)){
+                    addMessageBox("You:-\n" + message, 1);
+                }
+                else{
+                    addMessageBox(UserDetails.chatWith + ":-\n" + message, 2);
+                }
+            }
+
+            @Override
+            public void onChildChanged(DataSnapshot dataSnapshot, String s) {
+
+            }
+
+            @Override
+            public void onChildRemoved(DataSnapshot dataSnapshot) {
+
+            }
+
+            @Override
+            public void onChildMoved(DataSnapshot dataSnapshot, String s) {
+
+            }
+
+            @Override
+            public void onCancelled(FirebaseError firebaseError) {
+
+            }
+        });
+    }
+
+    public void addMessageBox(String message, int type){
+        TextView textView = new TextView(Chat.this);
+        textView.setText(message);
+
+        LinearLayout.LayoutParams lp2 = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
+        lp2.weight = 1.0f;
+
+        if(type == 1) {
+            lp2.gravity = Gravity.LEFT;
+            textView.setBackgroundResource(R.drawable.bubble_in);
+        }
+        else{
+            lp2.gravity = Gravity.RIGHT;
+            textView.setBackgroundResource(R.drawable.bubble_out);
+        }
+        textView.setLayoutParams(lp2);
+        layout.addView(textView);
+        scrollView.fullScroll(View.FOCUS_DOWN);
+    }
+}