Login interface created! Google Sign option added!

app/build.gradle

@@ -3,6 +3,7 @@ plugins {
     id 'com.chaquo.python'
     id 'kotlin-android'
     id 'kotlin-android-extensions'
+    id 'com.google.gms.google-services'
 }
 
 apply plugin: 'com.android.application'
@@ -55,7 +56,9 @@ dependencies {
     implementation 'androidx.appcompat:appcompat:1.2.0'
     implementation 'com.google.android.material:material:1.3.0'
     implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
-
+    //firebase
+    implementation platform('com.google.firebase:firebase-bom:28.4.2')
+    implementation 'com.google.android.gms:play-services-auth:19.2.0'
     //retrofit
     implementation 'com.squareup.retrofit2:retrofit:2.9.0'
     implementation 'com.squareup.retrofit2:converter-gson:2.9.0'
@@ -66,6 +69,9 @@ dependencies {
     implementation 'androidx.lifecycle:lifecycle-livedata-ktx:2.3.1'
     implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.3.1'
     implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+    implementation 'androidx.annotation:annotation:1.1.0'
+    implementation 'com.google.android.gms:play-services-auth:18.0.0'
+    implementation 'com.google.firebase:firebase-auth:21.0.1'
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.2'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'

app/google-services.json

+{
+  "project_info": {
+    "project_number": "896347651222",
+    "project_id": "archemistrylab-8bef8",
+    "storage_bucket": "archemistrylab-8bef8.appspot.com"
+  },
+  "client": [
+    {
+      "client_info": {
+        "mobilesdk_app_id": "1:896347651222:android:f4eacd7bf2aa0a5d9e16b7",
+        "android_client_info": {
+          "package_name": "com.example.archemistrylab"
+        }
+      },
+      "oauth_client": [
+        {
+          "client_id": "896347651222-00g5heg0v8r55akrantl1ol9divnp44q.apps.googleusercontent.com",
+          "client_type": 3
+        }
+      ],
+      "api_key": [
+        {
+          "current_key": "AIzaSyD5x9E774Cev4BElq82fRiAdJQyQDKu5v8"
+        }
+      ],
+      "services": {
+        "appinvite_service": {
+          "other_platform_oauth_client": [
+            {
+              "client_id": "896347651222-00g5heg0v8r55akrantl1ol9divnp44q.apps.googleusercontent.com",
+              "client_type": 3
+            }
+          ]
+        }
+      }
+    }
+  ],
+  "configuration_version": "1"
+}
\ No newline at end of file

app/src/main/AndroidManifest.xml

@@ -10,12 +10,15 @@
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_main_icon_1_foreground"
         android:supportsRtl="true"
-        android:usesCleartextTraffic="true"
-        android:theme="@style/Theme.ARChemistryLab">
-        <activity android:name=".ChatbotMain"></activity>
+        android:theme="@style/Theme.ARChemistryLab"
+        android:usesCleartextTraffic="true">
+        <activity
+            android:name=".LoginActivity"/>
+        <activity android:name=".ChatbotMain" />
         <activity android:name="chatbot.MainActivity" />
+        <activity android:name=".MainActivity" />
         <activity
-            android:name=".MainActivity"
+            android:name=".welcome"
             android:label="@string/app_name"
             android:theme="@style/Theme.ARChemistryLab.NoActionBar">
             <intent-filter>

app/src/main/java/com/example/archemistrylab/LoginActivity.java

+package com.example.archemistrylab;
+
+import android.app.Activity;
+import android.content.Intent;
+import android.os.Bundle;
+import android.provider.ContactsContract;
+import android.text.Editable;
+import android.text.TextWatcher;
+import android.util.Log;
+import android.view.KeyEvent;
+import android.view.View;
+import android.view.WindowManager;
+import android.view.inputmethod.EditorInfo;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.ProgressBar;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import com.google.android.gms.auth.api.signin.GoogleSignIn;
+import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
+import com.google.android.gms.auth.api.signin.GoogleSignInClient;
+import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
+import com.google.android.gms.common.api.ApiException;
+import com.google.android.gms.tasks.OnCompleteListener;
+import com.google.android.gms.tasks.Task;
+import com.google.firebase.auth.AuthCredential;
+import com.google.firebase.auth.AuthResult;
+import com.google.firebase.auth.FirebaseAuth;
+import com.google.firebase.auth.FirebaseUser;
+import com.google.firebase.auth.GoogleAuthProvider;
+
+import androidx.annotation.NonNull;
+import androidx.appcompat.app.AppCompatActivity;
+
+
+
+public class LoginActivity extends AppCompatActivity {
+
+    private GoogleSignInClient mGoogleSignInClient;
+    private final static int RC_SIGN_IN = 123;
+    private FirebaseAuth mAuth;
+
+
+    @Override
+    protected void onStart() {
+        super.onStart();
+
+
+        FirebaseUser user = mAuth.getCurrentUser();
+        if(user!=null){
+            Intent intent = new Intent(getApplicationContext(),MainActivity.class);
+            startActivity(intent);
+        }
+
+
+    }
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_login);
+
+        mAuth = FirebaseAuth.getInstance();
+        createRequest();
+
+
+        findViewById(R.id.google_signIn).setOnClickListener(new View.OnClickListener() {
+
+            @Override
+            public void onClick(View view) {
+                signIn();
+            }
+        });
+
+            }
+
+
+    private void createRequest() {
+
+
+        // Configure Google Sign In
+        GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
+                .requestIdToken(getString(R.string.default_web_client_id))
+                .requestEmail()
+                .build();
+
+
+        // Build a GoogleSignInClient with the options specified by gso.
+        mGoogleSignInClient = GoogleSignIn.getClient(this, gso);
+
+
+    }
+
+    private void signIn() {
+        Intent signInIntent = mGoogleSignInClient.getSignInIntent();
+        startActivityForResult(signInIntent, RC_SIGN_IN);
+    }
+
+
+    @Override
+    public void onActivityResult(int requestCode, int resultCode, Intent data) {
+        super.onActivityResult(requestCode, resultCode, data);
+
+        // Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
+        if (requestCode == RC_SIGN_IN) {
+            Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
+            try {
+                // Google Sign In was successful, authenticate with Firebase
+                GoogleSignInAccount account = task.getResult(ApiException.class);
+                firebaseAuthWithGoogle(account);
+            } catch (ApiException e) {
+                // Google Sign In failed, update UI appropriately
+                Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show();
+            }
+        }
+    }
+
+
+    private void firebaseAuthWithGoogle(GoogleSignInAccount acct) {
+
+
+        AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);
+        mAuth.signInWithCredential(credential)
+                .addOnCompleteListener(this, new OnCompleteListener() {
+                    @Override
+                    public void onComplete(@NonNull Task task) {
+                        if (task.isSuccessful()) {
+                            // Sign in success, update UI with the signed-in user's information
+                            FirebaseUser user = mAuth.getCurrentUser();
+                            Intent intent = new Intent(getApplicationContext(),MainActivity.class);
+                            startActivity(intent);
+
+
+                        } else {
+                            Toast.makeText(LoginActivity.this, "Sorry auth failed.", Toast.LENGTH_SHORT).show();
+
+
+                        }
+
+
+                        // ...
+                    }
+                });
+    }
+}
+

app/src/main/java/com/example/archemistrylab/MainActivity.java

 package com.example.archemistrylab;
 
+import android.content.ClipData;
+import android.content.DialogInterface;
 import android.content.Intent;
 import android.os.Bundle;
+import android.view.MenuInflater;
+import android.view.MenuItem;
 import android.view.View;
 import android.view.Menu;
 import android.widget.TextView;
@@ -9,7 +13,10 @@ import android.widget.TextView;
 import com.google.android.material.floatingactionbutton.FloatingActionButton;
 import com.google.android.material.snackbar.Snackbar;
 import com.google.android.material.navigation.NavigationView;
+import com.google.firebase.auth.FirebaseAuth;
 
+import androidx.appcompat.app.AlertDialog;
+import androidx.core.view.GravityCompat;
 import androidx.navigation.NavController;
 import androidx.navigation.Navigation;
 import androidx.navigation.ui.AppBarConfiguration;
@@ -27,8 +34,8 @@ public class MainActivity extends AppCompatActivity {
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
-        Toolbar toolbar = findViewById(R.id.toolbar);
-        setSupportActionBar(toolbar);
+       // Toolbar toolbar = findViewById(R.id.toolbar);
+       // setSupportActionBar(toolbar);
         FloatingActionButton fab = findViewById(R.id.fab);
 
 
@@ -50,14 +57,56 @@ public class MainActivity extends AppCompatActivity {
         NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
         NavigationUI.setupWithNavController(navigationView, navController);
     }
+    @Override
+    public void onBackPressed() {
+        DrawerLayout drawer = findViewById(R.id.drawer_layout);
+        if (drawer.isDrawerOpen(GravityCompat.START)) {
+            drawer.closeDrawer(GravityCompat.START);
+        } else {
+            final AlertDialog.Builder builder= new AlertDialog.Builder(MainActivity.this);
+            builder.setMessage("Are you sure want to Exit ?");
+            builder.setCancelable(true);
+            builder.setNegativeButton("Yes", new DialogInterface.OnClickListener() {
+                @Override
+                public void onClick(DialogInterface dialogInterface, int i) {
+                    finish();
+                }
+            });
+            builder.setPositiveButton("Cancle", new DialogInterface.OnClickListener() {
+                @Override
+                public void onClick(DialogInterface dialogInterface, int i) {
+                    dialogInterface.cancel();
+                }
+            });
+            AlertDialog alrt = builder.create();
+            alrt.show();
+        }
+    }
+    private void logout() {
+        FirebaseAuth.getInstance().signOut();
+        Intent intent = new Intent(MainActivity.this, LoginActivity.class);
+        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
+        startActivity(intent);
+        finish();
+    }
 
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        // Handle item selection
+        switch (item.getItemId()) {
+            case R.id.action_settings:
+                logout();
+                return true;
+            default:
+                return super.onOptionsItemSelected(item);
+        }
+    }
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         // Inflate the menu; this adds items to the action bar if it is present.
         getMenuInflater().inflate(R.menu.main, menu);
         return true;
     }
-
     @Override
     public boolean onSupportNavigateUp() {
         NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);

app/src/main/java/com/example/archemistrylab/data/LoginDataSource.java

+package com.example.archemistrylab.data;
+
+import com.example.archemistrylab.data.model.LoggedInUser;
+
+import java.io.IOException;
+
+/**
+ * Class that handles authentication w/ login credentials and retrieves user information.
+ */
+public class LoginDataSource {
+
+    public Result<LoggedInUser> login(String username, String password) {
+
+        try {
+            // TODO: handle loggedInUser authentication
+            LoggedInUser fakeUser =
+                    new LoggedInUser(
+                            java.util.UUID.randomUUID().toString(),
+                            "Jane Doe");
+            return new Result.Success<>(fakeUser);
+        } catch (Exception e) {
+            return new Result.Error(new IOException("Error logging in", e));
+        }
+    }
+
+    public void logout() {
+        // TODO: revoke authentication
+    }
+}
\ No newline at end of file

app/src/main/java/com/example/archemistrylab/data/LoginRepository.java

+package com.example.archemistrylab.data;
+
+import com.example.archemistrylab.data.model.LoggedInUser;
+
+/**
+ * Class that requests authentication and user information from the remote data source and
+ * maintains an in-memory cache of login status and user credentials information.
+ */
+public class LoginRepository {
+
+    private static volatile LoginRepository instance;
+
+    private LoginDataSource dataSource;
+
+    // If user credentials will be cached in local storage, it is recommended it be encrypted
+    // @see https://developer.android.com/training/articles/keystore
+    private LoggedInUser user = null;
+
+    // private constructor : singleton access
+    private LoginRepository(LoginDataSource dataSource) {
+        this.dataSource = dataSource;
+    }
+
+    public static LoginRepository getInstance(LoginDataSource dataSource) {
+        if (instance == null) {
+            instance = new LoginRepository(dataSource);
+        }
+        return instance;
+    }
+
+    public boolean isLoggedIn() {
+        return user != null;
+    }
+
+    public void logout() {
+        user = null;
+        dataSource.logout();
+    }
+
+    private void setLoggedInUser(LoggedInUser user) {
+        this.user = user;
+        // If user credentials will be cached in local storage, it is recommended it be encrypted
+        // @see https://developer.android.com/training/articles/keystore
+    }
+
+    public Result<LoggedInUser> login(String username, String password) {
+        // handle login
+        Result<LoggedInUser> result = dataSource.login(username, password);
+        if (result instanceof Result.Success) {
+            setLoggedInUser(((Result.Success<LoggedInUser>) result).getData());
+        }
+        return result;
+    }
+}
\ No newline at end of file

app/src/main/java/com/example/archemistrylab/data/Result.java

+package com.example.archemistrylab.data;
+
+/**
+ * A generic class that holds a result success w/ data or an error exception.
+ */
+public class Result<T> {
+    // hide the private constructor to limit subclass types (Success, Error)
+    private Result() {
+    }
+
+    @Override
+    public String toString() {
+        if (this instanceof Result.Success) {
+            Result.Success success = (Result.Success) this;
+            return "Success[data=" + success.getData().toString() + "]";
+        } else if (this instanceof Result.Error) {
+            Result.Error error = (Result.Error) this;
+            return "Error[exception=" + error.getError().toString() + "]";
+        }
+        return "";
+    }
+
+    // Success sub-class
+    public final static class Success<T> extends Result {
+        private T data;
+
+        public Success(T data) {
+            this.data = data;
+        }
+
+        public T getData() {
+            return this.data;
+        }
+    }
+
+    // Error sub-class
+    public final static class Error extends Result {
+        private Exception error;
+
+        public Error(Exception error) {
+            this.error = error;
+        }
+
+        public Exception getError() {
+            return this.error;
+        }
+    }
+}
\ No newline at end of file

app/src/main/java/com/example/archemistrylab/data/model/LoggedInUser.java

+package com.example.archemistrylab.data.model;
+
+/**
+ * Data class that captures user information for logged in users retrieved from LoginRepository
+ */
+public class LoggedInUser {
+
+    private String userId;
+    private String displayName;
+
+    public LoggedInUser(String userId, String displayName) {
+        this.userId = userId;
+        this.displayName = displayName;
+    }
+
+    public String getUserId() {
+        return userId;
+    }
+
+    public String getDisplayName() {
+        return displayName;
+    }
+}
\ No newline at end of file

app/src/main/java/com/example/archemistrylab/welcome.java

+package com.example.archemistrylab;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.ProgressBar;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import java.util.Timer;
+import java.util.TimerTask;
+
+public class welcome extends AppCompatActivity {
+ProgressBar pg;
+    private static int Splach_time=5000;
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_welcome);
+        pg=findViewById(R.id.progressBar2);
+new Timer().schedule(new TimerTask() {
+    @Override
+    public void run() {
+    startActivity(new Intent(getApplicationContext(), LoginActivity.class));
+    finish();
+    }
+
+},2000);
+
+
+
+        }
+    public void sendData(View v){
+        Intent myintent = new Intent();
+        startActivity(myintent);
+        pg.setVisibility(v.VISIBLE);
+
+    }
+    }
+

app/src/main/res/drawable/gradeint_background.xml

@@ -4,8 +4,8 @@
      <shape>
 
          <gradient android:angle="90"
-             android:startColor="#00c6fb"
-             android:endColor="#005bea"
+             android:startColor="#4481eb"
+             android:endColor="#04befe"
              android:type="linear"
 
              ></gradient>

app/src/main/res/layout/activity_login.xml

+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.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:id="@+id/container"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:paddingLeft="@dimen/activity_horizontal_margin"
+    android:paddingTop="@dimen/activity_vertical_margin"
+    android:paddingRight="@dimen/activity_horizontal_margin"
+    android:paddingBottom="@dimen/activity_vertical_margin"
+   >
+
+    <ImageView
+        android:id="@+id/imageView2"
+        android:layout_width="match_parent"
+        android:layout_height="150dp"
+        android:layout_gravity="center_horizontal"
+        android:layout_marginTop="150dp"
+        android:src="@drawable/ic_flask"
+        app:layout_constraintBottom_toTopOf="@+id/sign_text"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.742" />
+
+    <TextView
+        android:id="@+id/sign_text"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:includeFontPadding="false"
+        android:shadowColor="#0E0E0E"
+        android:text="Sign-In with Google"
+        android:textAlignment="center"
+        android:textColor="#000000"
+        android:textSize="14sp"
+        app:layout_constraintBottom_toTopOf="@+id/google_signIn"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/imageView2"
+        app:layout_constraintVertical_bias="0.273" />
+
+    <Button
+        android:id="@+id/google_signIn"
+
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="start"
+        android:layout_marginStart="48dp"
+        android:layout_marginEnd="48dp"
+        android:layout_marginBottom="208dp"
+        android:backgroundTint="#f43b47"
+        android:text="@string/action_sign_in"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.569"
+        app:layout_constraintStart_toStartOf="parent"
+
+        />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file

app/src/main/res/layout/activity_welcome.xml

+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.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"
+    android:background="@drawable/back"
+    tools:context=".welcome">
+
+    <ImageView
+        android:id="@+id/imageView18"
+        android:layout_width="245dp"
+        android:layout_height="187dp"
+        android:layout_marginStart="8dp"
+        android:layout_marginTop="8dp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.471"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.373"
+        app:srcCompat="@drawable/ic_flask" />
+
+    <ProgressBar
+        android:id="@+id/progressBar2"
+        style="?android:attr/progressBarStyle"
+        android:layout_width="57dp"
+        android:layout_height="58dp"
+        android:layout_marginStart="8dp"
+        android:layout_marginTop="8dp"
+        android:layout_marginEnd="8dp"
+        android:layout_marginBottom="8dp"
+        android:onClick="sendData"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/imageView18"
+        app:layout_constraintVertical_bias="0.271" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file

app/src/main/res/layout/content_main.xml

@@ -44,7 +44,6 @@
                 android:layout_height="fill_parent">
 
                 <LinearLayout
-
                     android:layout_width="match_parent"
                     android:layout_height="230dp"
                     android:background="@drawable/back"
@@ -68,7 +67,6 @@
                     android:orientation="vertical">
 
                     <LinearLayout
-
                         android:layout_width="match_parent"
                         android:layout_height="135dp"
                         android:layout_marginBottom="10dp"

app/src/main/res/layout/nav_header_main.xml

@@ -10,7 +10,7 @@
     android:paddingTop="@dimen/activity_vertical_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingBottom="@dimen/activity_vertical_margin"
-    android:theme="@style/ThemeOverlay.AppCompat.Dark">
+    android:backgroundTint="@color/browser_actions_bg_grey">
 
     <ImageView
         android:id="@+id/imageView"
@@ -18,13 +18,14 @@
         android:layout_height="wrap_content"
         android:contentDescription="@string/nav_header_desc"
         android:paddingTop="@dimen/nav_header_vertical_spacing"
-        app:srcCompat="@mipmap/ic_user_main_foreground" />
+        app:srcCompat="@mipmap/ic_main_icon_1"
+        android:visibility="gone"/>
 
     <TextView
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:paddingTop="@dimen/nav_header_vertical_spacing"
-        android:text="AR Chem"
+        android:text="@string/nav_header_title"
         android:textAppearance="@style/TextAppearance.AppCompat.Body1" />
 
     <TextView

app/src/main/res/values/colors.xml

@@ -2,7 +2,7 @@
 <resources>
     <color name="purple_200">#00c6fb</color>
     <color name="purple_500">#005bea</color>
-    <color name="purple_700">#005bea</color>
+    <color name="purple_700">#00c6fb</color>
     <color name="teal_200">#00c6fb</color>
     <color name="teal_700">#005bea</color>
     <color name="black">#FF000000</color>

app/src/main/res/values/strings.xml

@@ -2,12 +2,21 @@
     <string name="app_name">ARChemistryLab</string>
     <string name="navigation_drawer_open">Open navigation drawer</string>
     <string name="navigation_drawer_close">Close navigation drawer</string>
-    <string name="nav_header_title">Android Studio</string>
-    <string name="nav_header_subtitle">android.studio@android.com</string>
+    <string name="nav_header_title">Augmented Reality Chemistry</string>
+    <string name="nav_header_subtitle">archem.sliit.lk</string>
     <string name="nav_header_desc">Navigation header</string>
-    <string name="action_settings">Settings</string>
+    <string name="action_settings">Logout</string>
 
     <string name="menu_home">Home</string>
     <string name="menu_gallery">Settings</string>
     <string name="menu_slideshow">About Us</string>
+    <string name="title_activity_login">LoginActivity</string>
+    <string name="prompt_email">Email</string>
+    <string name="prompt_password">Password</string>
+    <string name="action_sign_in">Sign in or register</string>
+    <string name="action_sign_in_short">Sign in</string>
+    <string name="welcome">"Welcome !"</string>
+    <string name="invalid_username">Not a valid username</string>
+    <string name="invalid_password">Password must be >5 characters</string>
+    <string name="login_failed">"Login failed"</string>
 </resources>
\ No newline at end of file

build.gradle

@@ -12,6 +12,7 @@ buildscript {
         classpath "com.android.tools.build:gradle:4.1.3"
         classpath "com.chaquo.python:gradle:9.1.0"
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+        classpath 'com.google.gms:google-services:4.3.10'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files