diff --git a/LectureExamples/FirebaseDemo/.gitignore b/LectureExamples/FirebaseDemo/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..39fb081a42a86ccf8f9cf99dbccc8bdf7c828bce
--- /dev/null
+++ b/LectureExamples/FirebaseDemo/.gitignore
@@ -0,0 +1,9 @@
+*.iml
+.gradle
+/local.properties
+/.idea/workspace.xml
+/.idea/libraries
+.DS_Store
+/build
+/captures
+.externalNativeBuild
diff --git a/LectureExamples/FirebaseDemo/app/.gitignore b/LectureExamples/FirebaseDemo/app/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..796b96d1c402326528b4ba3c12ee9d92d0e212e9
--- /dev/null
+++ b/LectureExamples/FirebaseDemo/app/.gitignore
@@ -0,0 +1 @@
+/build
diff --git a/LectureExamples/FirebaseDemo/app/build.gradle b/LectureExamples/FirebaseDemo/app/build.gradle
new file mode 100644
index 0000000000000000000000000000000000000000..c9ef48cab90b302c851732ddb7a9888335d1a901
--- /dev/null
+++ b/LectureExamples/FirebaseDemo/app/build.gradle
@@ -0,0 +1,39 @@
+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 26
+    buildToolsVersion "26.0.1"
+    defaultConfig {
+        applicationId "com.example.andrejrasevic.firebasedemo"
+        minSdkVersion 21
+        targetSdkVersion 26
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+    packagingOptions {
+        exclude 'META-INF/LICENSE'
+        exclude 'META-INF/LICENSE-FIREBASE.txt'
+        exclude 'META-INF/NOTICE'
+    }
+}
+
+dependencies {
+    compile fileTree(dir: 'libs', include: ['*.jar'])
+    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
+        exclude group: 'com.android.support', module: 'support-annotations'
+    })
+    compile 'com.android.support:appcompat-v7:26.+'
+    compile 'com.android.support.constraint:constraint-layout:1.0.2'
+    compile 'com.android.support:design:26.+'
+    testCompile 'junit:junit:4.12'
+    compile 'com.google.firebase:firebase-database:9.0.2'
+}
+
+apply plugin: 'com.google.gms.google-services'
\ No newline at end of file
diff --git a/LectureExamples/FirebaseDemo/app/google-services.json b/LectureExamples/FirebaseDemo/app/google-services.json
new file mode 100644
index 0000000000000000000000000000000000000000..b0752c1556aa5de9ae2099ff190cb4a8b56585b4
--- /dev/null
+++ b/LectureExamples/FirebaseDemo/app/google-services.json
@@ -0,0 +1,55 @@
+{
+  "project_info": {
+    "project_number": "77138995653",
+    "firebase_url": "https://fir-demo-d5acb.firebaseio.com",
+    "project_id": "fir-demo-d5acb",
+    "storage_bucket": "fir-demo-d5acb.appspot.com"
+  },
+  "client": [
+    {
+      "client_info": {
+        "mobilesdk_app_id": "1:77138995653:android:3bbf6679b995f089",
+        "android_client_info": {
+          "package_name": "com.example.andrejrasevic.firebasedemo"
+        }
+      },
+      "oauth_client": [
+        {
+          "client_id": "77138995653-bmqmnhtg7v4541nqomd5naaerpb3b09s.apps.googleusercontent.com",
+          "client_type": 1,
+          "android_info": {
+            "package_name": "com.example.andrejrasevic.firebasedemo",
+            "certificate_hash": "aa7678e284ae6dfe2dff484bc15e39584babf847"
+          }
+        },
+        {
+          "client_id": "77138995653-sd30rjcl79cre19f6rsd4lhr8pvkue4c.apps.googleusercontent.com",
+          "client_type": 3
+        }
+      ],
+      "api_key": [
+        {
+          "current_key": "AIzaSyCOy_SFjTswVh7DrmL54LJHUOLdmB2y_Ys"
+        }
+      ],
+      "services": {
+        "analytics_service": {
+          "status": 1
+        },
+        "appinvite_service": {
+          "status": 2,
+          "other_platform_oauth_client": [
+            {
+              "client_id": "77138995653-sd30rjcl79cre19f6rsd4lhr8pvkue4c.apps.googleusercontent.com",
+              "client_type": 3
+            }
+          ]
+        },
+        "ads_service": {
+          "status": 2
+        }
+      }
+    }
+  ],
+  "configuration_version": "1"
+}
\ No newline at end of file
diff --git a/LectureExamples/FirebaseDemo/app/proguard-rules.pro b/LectureExamples/FirebaseDemo/app/proguard-rules.pro
new file mode 100644
index 0000000000000000000000000000000000000000..c6a0a2b06993ca7cc595c1c67b662093dd648c07
--- /dev/null
+++ b/LectureExamples/FirebaseDemo/app/proguard-rules.pro
@@ -0,0 +1,25 @@
+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in /Users/andrej.rasevic/Library/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 *;
+#}
+
+# 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
diff --git a/LectureExamples/FirebaseDemo/app/src/androidTest/java/com/example/andrejrasevic/firebasedemo/ExampleInstrumentedTest.java b/LectureExamples/FirebaseDemo/app/src/androidTest/java/com/example/andrejrasevic/firebasedemo/ExampleInstrumentedTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..71f16c5c1e8f947f480e9479a177609efc734381
--- /dev/null
+++ b/LectureExamples/FirebaseDemo/app/src/androidTest/java/com/example/andrejrasevic/firebasedemo/ExampleInstrumentedTest.java
@@ -0,0 +1,26 @@
+package com.example.andrejrasevic.firebasedemo;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumentation test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() throws Exception {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getTargetContext();
+
+        assertEquals("com.example.andrejrasevic.firebasedemo", appContext.getPackageName());
+    }
+}
diff --git a/LectureExamples/FirebaseDemo/app/src/main/AndroidManifest.xml b/LectureExamples/FirebaseDemo/app/src/main/AndroidManifest.xml
new file mode 100644
index 0000000000000000000000000000000000000000..0aa43383d56fb40075205eea4ffca3a08f4d5eb3
--- /dev/null
+++ b/LectureExamples/FirebaseDemo/app/src/main/AndroidManifest.xml
@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.andrejrasevic.firebasedemo">
+
+    <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"
+            android:label="@string/app_name"
+            android:theme="@style/AppTheme.NoActionBar">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>
\ No newline at end of file
diff --git a/LectureExamples/FirebaseDemo/app/src/main/java/com/example/andrejrasevic/firebasedemo/MainActivity.java b/LectureExamples/FirebaseDemo/app/src/main/java/com/example/andrejrasevic/firebasedemo/MainActivity.java
new file mode 100644
index 0000000000000000000000000000000000000000..1119c7015f77867382b92fe5b11fe65418b9d826
--- /dev/null
+++ b/LectureExamples/FirebaseDemo/app/src/main/java/com/example/andrejrasevic/firebasedemo/MainActivity.java
@@ -0,0 +1,121 @@
+package com.example.andrejrasevic.firebasedemo;
+
+import android.os.Bundle;
+import android.support.design.widget.FloatingActionButton;
+import android.support.design.widget.Snackbar;
+import android.support.v7.app.AppCompatActivity;
+import android.support.v7.widget.Toolbar;
+import android.util.Log;
+import android.view.View;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.widget.AdapterView;
+import android.widget.ArrayAdapter;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.ListView;
+
+import com.google.firebase.database.ChildEventListener;
+import com.google.firebase.database.DataSnapshot;
+import com.google.firebase.database.DatabaseError;
+import com.google.firebase.database.DatabaseReference;
+import com.google.firebase.database.FirebaseDatabase;
+import com.google.firebase.database.Query;
+import com.google.firebase.database.ValueEventListener;
+
+public class MainActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        // Get ListView object from xml
+        final ListView listView = (ListView) findViewById(R.id.listView);
+
+        // Create a new Adapter
+        final ArrayAdapter<String> adapter = new ArrayAdapter<>(this,
+                android.R.layout.simple_list_item_1, android.R.id.text1);
+
+        // Assign adapter to ListView
+        listView.setAdapter(adapter);
+
+        // Connect to the Firebase database
+        FirebaseDatabase database = FirebaseDatabase.getInstance();
+
+        // Get a reference to the todoItems child items it the database
+        final DatabaseReference myRef = database.getReference("todoItems");
+
+        // Assign a listener to detect changes to the child items
+        // of the database reference.
+        myRef.addChildEventListener(new ChildEventListener(){
+
+            // This function is called once for each child that exists
+            // when the listener is added. Then it is called
+            // each time a new child is added.
+            @Override
+            public void onChildAdded(DataSnapshot dataSnapshot, String previousChildName) {
+                String value = dataSnapshot.getValue(String.class);
+                adapter.add(value);
+            }
+
+            // This function is called each time a child item is removed.
+            public void onChildRemoved(DataSnapshot dataSnapshot){
+                String value = dataSnapshot.getValue(String.class);
+                adapter.remove(value);
+            }
+
+            // The following functions are also required in ChildEventListener implementations.
+            public void onChildChanged(DataSnapshot dataSnapshot, String previousChildName){}
+            public void onChildMoved(DataSnapshot dataSnapshot, String previousChildName){}
+
+            @Override
+            public void onCancelled(DatabaseError error) {
+                // Failed to read value
+                Log.w("TAG:", "Failed to read value.", error.toException());
+            }
+        });
+
+
+        // Add items via the Button and EditText at the bottom of the window.
+        final EditText text = (EditText) findViewById(R.id.todoText);
+        final Button button = (Button) findViewById(R.id.addButton);
+
+        button.setOnClickListener(new View.OnClickListener() {
+            public void onClick(View v) {
+
+                // Create a new child with a auto-generated ID.
+                DatabaseReference childRef = myRef.push();
+
+                // Set the child's data to the value passed in from the text box.
+                childRef.setValue(text.getText().toString());
+
+            }
+        });
+
+        // Delete items when clicked
+        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
+
+            public void onItemClick(AdapterView<?> parent, View view,
+                                    int position, long id) {
+
+                Query myQuery = myRef.orderByValue().equalTo((String)
+                        listView.getItemAtPosition(position));
+
+                myQuery.addListenerForSingleValueEvent(new ValueEventListener() {
+                    @Override
+                    public void onDataChange(DataSnapshot dataSnapshot) {
+                        if (dataSnapshot.hasChildren()) {
+                            DataSnapshot firstChild = dataSnapshot.getChildren().iterator().next();
+                            firstChild.getRef().removeValue();
+                        }
+                    }
+
+                    @Override
+                    public void onCancelled(DatabaseError databaseError) {
+                    }
+                })
+                ;}
+        })
+        ;}
+}
diff --git a/LectureExamples/FirebaseDemo/app/src/main/res/layout/activity_main.xml b/LectureExamples/FirebaseDemo/app/src/main/res/layout/activity_main.xml
new file mode 100644
index 0000000000000000000000000000000000000000..2a23a33b7185450556b81a6126a4124be713af10
--- /dev/null
+++ b/LectureExamples/FirebaseDemo/app/src/main/res/layout/activity_main.xml
@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout 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:paddingLeft="@dimen/activity_horizontal_margin"
+    android:paddingRight="@dimen/activity_horizontal_margin"
+    android:paddingTop="@dimen/activity_vertical_margin"
+    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"
+    android:orientation="vertical">
+
+    <ListView
+        android:id="@+id/listView"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_weight="1">
+    </ListView>
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="vertical"
+        android:layout_gravity="bottom">
+        <EditText
+            android:id="@+id/todoText"
+            android:layout_width="fill_parent"
+            android:layout_height="wrap_content"/>
+        <Button
+            android:id="@+id/addButton"
+            android:layout_width="fill_parent"
+            android:layout_height="wrap_content"
+            android:text="Add New Item"/>
+    </LinearLayout>
+</LinearLayout>
\ No newline at end of file
diff --git a/LectureExamples/FirebaseDemo/app/src/main/res/layout/content_main.xml b/LectureExamples/FirebaseDemo/app/src/main/res/layout/content_main.xml
new file mode 100644
index 0000000000000000000000000000000000000000..b52c1d19912c2e25dc3cccb6bc842cab0e8691bd
--- /dev/null
+++ b/LectureExamples/FirebaseDemo/app/src/main/res/layout/content_main.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    app:layout_behavior="@string/appbar_scrolling_view_behavior"
+    tools:context="com.example.andrejrasevic.firebasedemo.MainActivity"
+    tools:showIn="@layout/activity_main">
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Hello World!"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</android.support.constraint.ConstraintLayout>
diff --git a/LectureExamples/FirebaseDemo/app/src/main/res/menu/menu_main.xml b/LectureExamples/FirebaseDemo/app/src/main/res/menu/menu_main.xml
new file mode 100644
index 0000000000000000000000000000000000000000..a42377879c99a22788874f26a4a6ee26c7ca6edf
--- /dev/null
+++ b/LectureExamples/FirebaseDemo/app/src/main/res/menu/menu_main.xml
@@ -0,0 +1,10 @@
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    tools:context="com.example.andrejrasevic.firebasedemo.MainActivity">
+    <item
+        android:id="@+id/action_settings"
+        android:orderInCategory="100"
+        android:title="@string/action_settings"
+        app:showAsAction="never" />
+</menu>
diff --git a/LectureExamples/FirebaseDemo/app/src/main/res/mipmap-hdpi/ic_launcher.png b/LectureExamples/FirebaseDemo/app/src/main/res/mipmap-hdpi/ic_launcher.png
new file mode 100644
index 0000000000000000000000000000000000000000..cde69bcccec65160d92116f20ffce4fce0b5245c
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diff --git a/LectureExamples/FirebaseDemo/app/src/main/res/mipmap-hdpi/ic_launcher_round.png b/LectureExamples/FirebaseDemo/app/src/main/res/mipmap-hdpi/ic_launcher_round.png
new file mode 100644
index 0000000000000000000000000000000000000000..9a078e3e1a42d474c78470a73c7987cf7ac5d9a0
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diff --git a/LectureExamples/FirebaseDemo/app/src/main/res/mipmap-mdpi/ic_launcher.png b/LectureExamples/FirebaseDemo/app/src/main/res/mipmap-mdpi/ic_launcher.png
new file mode 100644
index 0000000000000000000000000000000000000000..c133a0cbd379f5af6dbf1a899a0293ca5eccfad0
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diff --git a/LectureExamples/FirebaseDemo/app/src/main/res/mipmap-mdpi/ic_launcher_round.png b/LectureExamples/FirebaseDemo/app/src/main/res/mipmap-mdpi/ic_launcher_round.png
new file mode 100644
index 0000000000000000000000000000000000000000..efc028a636dd690a51db5a525cf781a5a7daba68
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diff --git a/LectureExamples/FirebaseDemo/app/src/main/res/mipmap-xhdpi/ic_launcher.png b/LectureExamples/FirebaseDemo/app/src/main/res/mipmap-xhdpi/ic_launcher.png
new file mode 100644
index 0000000000000000000000000000000000000000..bfa42f0e7b91d006d22352c9ff2f134e504e3c1d
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diff --git a/LectureExamples/FirebaseDemo/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png b/LectureExamples/FirebaseDemo/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png
new file mode 100644
index 0000000000000000000000000000000000000000..3af2608a4492ef9ae63a77ec3305aedda89594cb
Binary files /dev/null and b/LectureExamples/FirebaseDemo/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png differ
diff --git a/LectureExamples/FirebaseDemo/app/src/main/res/mipmap-xxhdpi/ic_launcher.png b/LectureExamples/FirebaseDemo/app/src/main/res/mipmap-xxhdpi/ic_launcher.png
new file mode 100644
index 0000000000000000000000000000000000000000..324e72cdd7480cb983fa1bcc7ce686e51ef87fe7
Binary files /dev/null and b/LectureExamples/FirebaseDemo/app/src/main/res/mipmap-xxhdpi/ic_launcher.png differ
diff --git a/LectureExamples/FirebaseDemo/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png b/LectureExamples/FirebaseDemo/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png
new file mode 100644
index 0000000000000000000000000000000000000000..9bec2e623103ac9713b00cad8502a057c1efda61
Binary files /dev/null and b/LectureExamples/FirebaseDemo/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png differ
diff --git a/LectureExamples/FirebaseDemo/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png b/LectureExamples/FirebaseDemo/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png
new file mode 100644
index 0000000000000000000000000000000000000000..aee44e138434630332d88b1680f33c4b24c70ab3
Binary files /dev/null and b/LectureExamples/FirebaseDemo/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png differ
diff --git a/LectureExamples/FirebaseDemo/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png b/LectureExamples/FirebaseDemo/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png
new file mode 100644
index 0000000000000000000000000000000000000000..34947cd6bbf9c729be83edc96ad08a1d42b82bc9
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diff --git a/LectureExamples/FirebaseDemo/app/src/main/res/values/colors.xml b/LectureExamples/FirebaseDemo/app/src/main/res/values/colors.xml
new file mode 100644
index 0000000000000000000000000000000000000000..3ab3e9cbce07f7cdc941fc8ba424c05e83ed80f0
--- /dev/null
+++ b/LectureExamples/FirebaseDemo/app/src/main/res/values/colors.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="colorPrimary">#3F51B5</color>
+    <color name="colorPrimaryDark">#303F9F</color>
+    <color name="colorAccent">#FF4081</color>
+</resources>
diff --git a/LectureExamples/FirebaseDemo/app/src/main/res/values/dimens.xml b/LectureExamples/FirebaseDemo/app/src/main/res/values/dimens.xml
new file mode 100644
index 0000000000000000000000000000000000000000..4d6ddf55483cdce48bcc8bac37d69972dd82385d
--- /dev/null
+++ b/LectureExamples/FirebaseDemo/app/src/main/res/values/dimens.xml
@@ -0,0 +1,5 @@
+<resources>
+    <dimen name="fab_margin">16dp</dimen>
+    <dimen name="activity_horizontal_margin">16dp</dimen>
+    <dimen name="activity_vertical_margin">16dp</dimen>
+</resources>
diff --git a/LectureExamples/FirebaseDemo/app/src/main/res/values/strings.xml b/LectureExamples/FirebaseDemo/app/src/main/res/values/strings.xml
new file mode 100644
index 0000000000000000000000000000000000000000..937fe8fb7e3a715a75cf15d6eb9cc33b929be817
--- /dev/null
+++ b/LectureExamples/FirebaseDemo/app/src/main/res/values/strings.xml
@@ -0,0 +1,4 @@
+<resources>
+    <string name="app_name">FirebaseDemo</string>
+    <string name="action_settings">Settings</string>
+</resources>
diff --git a/LectureExamples/FirebaseDemo/app/src/main/res/values/styles.xml b/LectureExamples/FirebaseDemo/app/src/main/res/values/styles.xml
new file mode 100644
index 0000000000000000000000000000000000000000..545b9c6d2c45df7938f8ffd5ac2d806dec36f122
--- /dev/null
+++ b/LectureExamples/FirebaseDemo/app/src/main/res/values/styles.xml
@@ -0,0 +1,20 @@
+<resources>
+
+    <!-- Base application theme. -->
+    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
+        <!-- Customize your theme here. -->
+        <item name="colorPrimary">@color/colorPrimary</item>
+        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
+        <item name="colorAccent">@color/colorAccent</item>
+    </style>
+
+    <style name="AppTheme.NoActionBar">
+        <item name="windowActionBar">false</item>
+        <item name="windowNoTitle">true</item>
+    </style>
+
+    <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />
+
+    <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />
+
+</resources>
diff --git a/LectureExamples/FirebaseDemo/app/src/test/java/com/example/andrejrasevic/firebasedemo/ExampleUnitTest.java b/LectureExamples/FirebaseDemo/app/src/test/java/com/example/andrejrasevic/firebasedemo/ExampleUnitTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..e67a1888f1d01662041a6b7e56a8b63f41e5ac6f
--- /dev/null
+++ b/LectureExamples/FirebaseDemo/app/src/test/java/com/example/andrejrasevic/firebasedemo/ExampleUnitTest.java
@@ -0,0 +1,17 @@
+package com.example.andrejrasevic.firebasedemo;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+public class ExampleUnitTest {
+    @Test
+    public void addition_isCorrect() throws Exception {
+        assertEquals(4, 2 + 2);
+    }
+}
\ No newline at end of file
diff --git a/LectureExamples/FirebaseDemo/build.gradle b/LectureExamples/FirebaseDemo/build.gradle
new file mode 100644
index 0000000000000000000000000000000000000000..1951fbd9d59dccc22a554550823a4244a4880384
--- /dev/null
+++ b/LectureExamples/FirebaseDemo/build.gradle
@@ -0,0 +1,24 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+
+buildscript {
+    repositories {
+        jcenter()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:2.3.3'
+        classpath 'com.google.gms:google-services:3.1.0'
+        classpath 'com.google.gms:google-services:3.0.0'
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+allprojects {
+    repositories {
+        jcenter()
+    }
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}
diff --git a/LectureExamples/FirebaseDemo/gradle.properties b/LectureExamples/FirebaseDemo/gradle.properties
new file mode 100644
index 0000000000000000000000000000000000000000..aac7c9b4614ccfde6c721f24994cf30885a791d0
--- /dev/null
+++ b/LectureExamples/FirebaseDemo/gradle.properties
@@ -0,0 +1,17 @@
+# Project-wide Gradle settings.
+
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx1536m
+
+# 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
diff --git a/LectureExamples/FirebaseDemo/gradle/wrapper/gradle-wrapper.jar b/LectureExamples/FirebaseDemo/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000000000000000000000000000000000000..13372aef5e24af05341d49695ee84e5f9b594659
Binary files /dev/null and b/LectureExamples/FirebaseDemo/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/LectureExamples/FirebaseDemo/gradle/wrapper/gradle-wrapper.properties b/LectureExamples/FirebaseDemo/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000000000000000000000000000000000000..f6bb053a0b4a8d56ebdec4f6d1ed52303435b505
--- /dev/null
+++ b/LectureExamples/FirebaseDemo/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Sat Oct 21 10:50:48 EDT 2017
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip
diff --git a/LectureExamples/FirebaseDemo/gradlew b/LectureExamples/FirebaseDemo/gradlew
new file mode 100755
index 0000000000000000000000000000000000000000..9d82f78915133e1c35a6ea51252590fb38efac2f
--- /dev/null
+++ b/LectureExamples/FirebaseDemo/gradlew
@@ -0,0 +1,160 @@
+#!/usr/bin/env bash
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn ( ) {
+    echo "$*"
+}
+
+die ( ) {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+esac
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules
+function splitJvmOpts() {
+    JVM_OPTS=("$@")
+}
+eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS
+JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME"
+
+exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@"
diff --git a/LectureExamples/FirebaseDemo/gradlew.bat b/LectureExamples/FirebaseDemo/gradlew.bat
new file mode 100644
index 0000000000000000000000000000000000000000..aec99730b4e8fcd90b57a0e8e01544fea7c31a89
--- /dev/null
+++ b/LectureExamples/FirebaseDemo/gradlew.bat
@@ -0,0 +1,90 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windowz variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+if "%@eval[2+2]" == "4" goto 4NT_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+goto execute
+
+:4NT_args
+@rem Get arguments from the 4NT Shell from JP Software
+set CMD_LINE_ARGS=%$
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/LectureExamples/FirebaseDemo/settings.gradle b/LectureExamples/FirebaseDemo/settings.gradle
new file mode 100644
index 0000000000000000000000000000000000000000..e7b4def49cb53d9aa04228dd3edb14c9e635e003
--- /dev/null
+++ b/LectureExamples/FirebaseDemo/settings.gradle
@@ -0,0 +1 @@
+include ':app'