2nd Video is completed and Implemented 2 way data binding.

app/build.gradle

@@ -1,11 +1,19 @@
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
+    id 'kotlin-android'
+    id 'kotlin-kapt'
 }
 
 android {
     namespace 'com.example.mvvmproject'
     compileSdk 33
+    buildFeatures {
+        viewBinding = true
+    }
+    dataBinding{
+        enabled = true
+    }
 
     defaultConfig {
         applicationId "com.example.mvvmproject"
@@ -33,12 +41,35 @@ android {
 }
 
 dependencies {
-
-    implementation 'androidx.core:core-ktx:1.7.0'
+    implementation 'androidx.core:core-ktx:1.10.0'
     implementation 'androidx.appcompat:appcompat:1.6.1'
     implementation 'com.google.android.material:material:1.8.0'
     implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.5'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
+
+    // Retrofit and GSON
+    implementation 'com.squareup.retrofit2:retrofit:2.1.0'
+    implementation 'com.squareup.retrofit2:converter-gson:2.1.0'
+
+    // Kotlin coroutines
+    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.1'
+    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.6.1'
+
+    // ViewModel and livedata
+    implementation "androidx.lifecycle:lifecycle-extensions:2.2.0"
+
+    // new material 3 design
+    implementation "androidx.compose.material3:material3:1.0.1"
+    implementation "androidx.compose.material3:material3-window-size-class:1.0.1"
+
+    //Android room
+    implementation "androidx.room:room-runtime:2.5.1"
+    implementation "androidx.room:room-ktx:2.5.1"
+    kapt "androidx.room:room-compiler:2.5.1"
+
+    // Android navigation architecture
+    implementation "androidx.navigation:navigation-fragment-ktx:2.5.3"
+    implementation "androidx.navigation:navigation-ui-ktx:2.5.3"
 }

app/src/main/AndroidManifest.xml

@@ -12,7 +12,7 @@
         android:theme="@style/Theme.MVVMProject"
         tools:targetApi="31">
         <activity
-            android:name=".MainActivity"
+            android:name=".ui.auth.LoginActivity"
             android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />

app/src/main/java/com/example/mvvmproject/ui/auth/AuthListener.kt

@@ -0,0 +1,7 @@
+package com.example.mvvmproject.ui.auth
+
+interface AuthListener {
+    fun onStarted()
+    fun onSuccess()
+    fun onFailure(failureMessage: String)
+}

app/src/main/java/com/example/mvvmproject/ui/auth/AuthViewModel.kt

@@ -0,0 +1,21 @@
+package com.example.mvvmproject.ui.auth
+
+import android.view.View
+import androidx.lifecycle.ViewModel
+
+class AuthViewModel : ViewModel() {
+    var email: String? = null
+    var password: String? = null
+    var authListener: AuthListener? = null
+
+    fun onLoginButtonClick(view: View) {
+        authListener?.onStarted()
+        if (email.isNullOrEmpty() || password.isNullOrEmpty()) {
+            authListener?.onFailure("Invalid Email or Password")
+            return
+        }
+
+        // success
+        authListener?.onSuccess()
+    }
+}

app/src/main/java/com/example/mvvmproject/ui/auth/LoginActivity.kt

@@ -0,0 +1,32 @@
+package com.example.mvvmproject.ui.auth
+
+import androidx.appcompat.app.AppCompatActivity
+import android.os.Bundle
+import androidx.databinding.DataBindingUtil
+import androidx.lifecycle.ViewModelProviders.*
+import com.example.mvvmproject.R
+import com.example.mvvmproject.databinding.ActivityLoginBinding
+import com.example.mvvmproject.util.toast
+
+class LoginActivity : AppCompatActivity(), AuthListener {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        val binding: ActivityLoginBinding =
+            DataBindingUtil.setContentView(this, R.layout.activity_login)
+        val viewmodel = of(this).get(AuthViewModel::class.java)
+        binding.viewmodel = viewmodel
+        viewmodel.authListener = this
+    }
+
+    override fun onStarted() {
+        toast("Login started")
+    }
+
+    override fun onSuccess() {
+        toast("Login successful")
+    }
+
+    override fun onFailure(failureMessage: String) {
+        toast(failureMessage)
+    }
+}

app/src/main/java/com/example/mvvmproject/MainActivity.kt → app/src/main/java/com/example/mvvmproject/ui/auth/SignUpActivity.kt

@@ -1,11 +1,12 @@
-package com.example.mvvmproject
+package com.example.mvvmproject.ui.auth
 
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import com.example.mvvmproject.R
 
-class MainActivity : AppCompatActivity() {
+class SignUpActivity : AppCompatActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        setContentView(R.layout.activity_main)
+        setContentView(R.layout.activity_sign_up)
     }
 }

app/src/main/java/com/example/mvvmproject/util/ViewUtils.kt

@@ -0,0 +1,9 @@
+package com.example.mvvmproject.util
+
+import android.content.Context
+import android.widget.Toast
+
+// Method to show directly toast.
+fun Context.toast(msg: String) {
+    Toast.makeText(this, msg, Toast.LENGTH_SHORT).show()
+}

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

@@ -0,0 +1,62 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layout 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">
+
+    <data>
+        <variable
+            name="viewmodel"
+            type="com.example.mvvmproject.ui.auth.AuthViewModel" />
+    </data>
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        tools:context=".ui.auth.LoginActivity">
+
+        <TextView
+            android:id="@+id/email_label"
+            style="@style/TextAppearance.AppCompat.Display2"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="100dp"
+            android:layout_marginBottom="50dp"
+            android:gravity="center"
+            android:text="@string/mvvm_project"
+            app:layout_constraintBottom_toTopOf="@+id/email"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent" />
+
+        <com.google.android.material.textfield.TextInputEditText
+            android:id="@+id/email"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginHorizontal="20dp"
+            android:layout_marginTop="50dp"
+            android:text="@={viewmodel.email}"
+            android:hint="@string/type_your_email"
+            app:layout_constraintTop_toBottomOf="@id/email_label" />
+
+        <com.google.android.material.textfield.TextInputEditText
+            android:id="@+id/password"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginHorizontal="20dp"
+            android:layout_marginTop="30dp"
+            android:text="@={viewmodel.password}"
+            android:hint="@string/enter_password_text"
+            app:layout_constraintTop_toBottomOf="@id/email" />
+
+        <com.google.android.material.button.MaterialButton
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="50dp"
+            android:onClick="@{viewmodel::onLoginButtonClick}"
+            android:text="@string/login_button_Text"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/password" />
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+</layout>

app/src/main/res/layout/activity_main.xml → app/src/main/res/layout/activity_sign_up.xml

@@ -4,15 +4,6 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    tools:context=".MainActivity">
-
-    <TextView
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="Hello World!"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+    tools:context=".ui.auth.SignUpActivity">
 
 </androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -1,3 +1,7 @@
 <resources>
     <string name="app_name">MVVM project</string>
+    <string name="type_your_email">type your email</string>
+    <string name="mvvm_project">MVVM Project</string>
+    <string name="enter_password_text">Enter password</string>
+    <string name="login_button_Text">login</string>
 </resources>

gradle.properties

@@ -15,9 +15,11 @@ org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
 # Android operating system, and which are packaged with your app's APK
 # https://developer.android.com/topic/libraries/support-library/androidx-rn
 android.useAndroidX=true
+android.enableJetifier=true
 # Kotlin code style for this project: "official" or "obsolete":
 kotlin.code.style=official
 # Enables namespacing of each library's R class so that its R class includes only the
 # resources declared in the library itself and none from the library's dependencies,
 # thereby reducing the size of the R class for that library
-android.nonTransitiveRClass=true
+android.nonTransitiveRClass=true
+android.databinding.enablev2=true