diff --git a/2_PROJECT_ANDROID.md b/2_PROJECT_ANDROID.md
new file mode 100644
index 0000000..01fc14d
--- /dev/null
+++ b/2_PROJECT_ANDROID.md
@@ -0,0 +1,242 @@
+
+---
+
+## 🛠️ Bước 1: Khởi tạo các file build cấu hình Gradle cho Android
+
+Để Android Studio có thể nhận diện và compile dự án, bạn cần tạo các file cấu hình bằng Kotlin DSL (`.gradle.kts`) tại thư mục `android-project`.
+
+### 1. Tạo file `android-project/settings.gradle.kts`
+
+File này dùng để khai báo tên dự án và quản lý kho chứa thư viện (Repositories).
+
+```kotlin
+pluginManagement {
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+rootProject.name = "RetroPhotobooth"
+include(":app")
+
+```
+
+### 2. Tạo file `android-project/build.gradle.kts` (Của thư mục gốc Android)
+
+```kotlin
+plugins {
+    id("com.android.application") version "8.2.2" apply false
+    id("org.jetbrains.kotlin.android") version "1.9.22" apply false
+}
+
+```
+
+### 3. Tạo file `android-project/app/build.gradle.kts` (Của module app)
+
+Đây là nơi chúng ta khai báo SDK và các thư viện cần dùng (CameraX, Jetpack Compose hoặc XML Views). Ở đây mình cấu hình sẵn các dependency cho **CameraX**.
+
+```kotlin
+plugins {
+    id("com.android.application")
+    id("org.jetbrains.kotlin.android")
+}
+
+android {
+    namespace = "com.photobooth.app"
+    compileSdk = 34
+
+    defaultConfig {
+        applicationId = "com.photobooth.app"
+        minSdk = 26 // Android 8.0 trở lên để hỗ trợ tốt các tính năng đồ họa
+        targetSdk = 34
+        versionCode = 1
+        versionName = "1.0"
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+        }
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+    kotlinOptions {
+        jvmTarget = "17"
+    }
+    buildFeatures {
+        viewBinding = true // Bật ViewBinding để thao tác với giao diện dễ dàng
+    }
+}
+
+dependencies {
+    implementation("androidx.core:core-ktx:1.12.0")
+    implementation("androidx.appcompat:appcompat:1.6.1")
+    implementation("com.google.android.material:material:1.11.0")
+    implementation("androidx.constraintlayout:constraintlayout:2.1.4")
+
+    // --- Thư viện CameraX Core ---
+    val cameraVersion = "1.3.1"
+    implementation("androidx.camera:camera-core:$cameraVersion")
+    implementation("androidx.camera:camera-camera2:$cameraVersion")
+    implementation("androidx.camera:camera-lifecycle:$cameraVersion")
+    implementation("androidx.camera:camera-view:$cameraVersion")
+    implementation("androidx.camera:camera-extensions:$cameraVersion")
+}
+
+```
+
+---
+
+## 📸 Bước 2: Thiết lập Giao diện Chụp ảnh (XML Layout)
+
+Tạo file giao diện hiển thị Camera preview và nút chụp ảnh tại đường dẫn:
+`android-project/app/src/main/res/layout/activity_main.xml` *(Bạn cần tạo thêm các thư mục `res/layout` nếu chưa có)*.
+
+```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"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="#121212">
+
+    <!-- Màn hình xem trước Camera -->
+    <androidx.camera.view.PreviewView
+        android:id="@+id/viewFinder"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        app:layout_constraintDimensionRatio="3:4"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toTopOf="@id/controlPanel" />
+
+    <!-- Bảng điều khiển phía dưới -->
+    <RelativeLayout
+        android:id="@+id/controlPanel"
+        android:layout_width="match_parent"
+        android:layout_height="120dp"
+        android:background="#000000"
+        app:layout_constraintBottom_toBottomOf="parent">
+
+        <!-- Nút chụp hình -->
+        <ImageButton
+            android:id="@+id/btnCapture"
+            android:layout_width="70dp"
+            android:layout_height="70dp"
+            android:layout_centerInParent="true"
+            android:background="@android:color/transparent"
+            android:src="@android:drawable/ic_menu_camera"
+            android:contentDescription="Capture Button" />
+    </RelativeLayout>
+
+</androidx.constraintlayout.widget.ConstraintLayout>
+
+```
+
+---
+
+## 💻 Bước 3: Viết Code Logic Khởi Tạo CameraX (Kotlin)
+
+Tạo file `MainActivity.kt` tại đường dẫn `android-project/app/src/main/java/com/photobooth/app/MainActivity.kt`. Đoạn code này thực hiện xin quyền Camera và kích hoạt kính ngắm.
+
+```kotlin
+package com.photobooth.app
+
+import android.Manifest
+import android.content.pm.PackageManager
+import android.os.Bundle
+import android.widget.Toast
+import androidx.appcompat.app.AppCompatActivity
+import androidx.camera.core.CameraSelector
+import androidx.camera.core.Preview
+import androidx.camera.lifecycle.ProcessCameraProvider
+import androidx.core.app.ActivityCompat
+import androidx.core.content.ContextCompat
+import com.photobooth.app.databinding.ActivityMainBinding
+import java.util.concurrent.ExecutorService
+import java.util.concurrent.Executors
+
+class MainActivity : AppCompatActivity() {
+    private lateinit var binding: ActivityMainBinding
+    private lateinit var cameraExecutor: ExecutorService
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        binding = ActivityMainBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+
+        // Xin quyền Camera
+        if (allPermissionsGranted()) {
+            startCamera()
+        } else {
+            ActivityCompat.requestPermissions(this, REQUIRED_PERMISSIONS, REQUEST_CODE_PERMISSIONS)
+        }
+
+        cameraExecutor = Executors.newSingleThreadExecutor()
+    }
+
+    private fun startCamera() {
+        val cameraProviderFuture = ProcessCameraProvider.getInstance(this)
+
+        cameraProviderFuture.addListener({
+            val cameraProvider: ProcessCameraProvider = cameraProviderFuture.get()
+
+            // Cấu hình Kính ngắm (Preview)
+            val preview = Preview.Builder().build().also {
+                it.setSurfaceProvider(binding.viewFinder.surfaceProvider)
+            }
+
+            // Chọn Camera Trước (Mặc định cho Photobooth)
+            val cameraSelector = CameraSelector.DEFAULT_FRONT_CAMERA
+
+            try {
+                cameraProvider.unbindAll()
+                cameraProvider.bindToLifecycle(this, cameraSelector, preview)
+            } catch (xc: Exception) {
+                Toast.makeText(this, "Không thể khởi động Camera", Toast.LENGTH_SHORT).show()
+            }
+        }, ContextCompat.getMainExecutor(this))
+    }
+
+    private fun allPermissionsGranted() = REQUIRED_PERMISSIONS.all {
+        ContextCompat.checkSelfPermission(baseContext, it) == PackageManager.PERMISSION_GRANTED
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        cameraExecutor.shutdown()
+    }
+
+    companion object {
+        private const val REQUEST_CODE_PERMISSIONS = 10
+        private val REQUIRED_PERMISSIONS = arrayOf(Manifest.permission.CAMERA)
+    }
+}
+
+```
+
+---
+
+## 🏃‍♂️ Việc cần làm ngay lúc này của bạn:
+
+1. **Mở Android Studio** trên Debian và thực hiện `Import Project`, trỏ tới thư mục `android-project`.
+2. Hệ thống sẽ tự động đồng bộ hóa (Gradle Sync).
+3. **Chạy thử nghiệm:** Bật Android Emulator (hoặc cắm điện thoại Android của bạn qua cổng USB bật gỡ lỗi ADB) để xem ứng dụng đã hiển thị được Camera lên màn hình chưa.
+
+Khi luồng hiển thị Camera này chạy thành công, chúng ta sẽ chuyển sang code tính năng **Đếm ngược tự động chụp liên tiếp 4 tấm** và lưu file ảnh thô.
\ No newline at end of file
diff --git a/android-project/app/build.gradle.kts b/android-project/app/build.gradle.kts
index cef6eca..361f2a4 100644
--- a/android-project/app/build.gradle.kts
+++ b/android-project/app/build.gradle.kts
@@ -5,19 +5,16 @@ plugins {
 
 android {
     namespace = "com.photobooth.app"
-    compileSdk = 33
+    compileSdk = 34
 
     defaultConfig {
         applicationId = "com.photobooth.app"
-        minSdk = 24
-        targetSdk = 33
+        minSdk = 26 // Android 8.0 trở lên để hỗ trợ tốt các tính năng đồ họa
+        targetSdk = 34
         versionCode = 1
         versionName = "1.0"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
-        vectorDrawables {
-            useSupportLibrary = true
-        }
     }
 
     buildTypes {
@@ -30,48 +27,28 @@ android {
         }
     }
     compileOptions {
-        sourceCompatibility = JavaVersion.VERSION_1_8
-        targetCompatibility = JavaVersion.VERSION_1_8
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
     }
     kotlinOptions {
-        jvmTarget = "1.8"
+        jvmTarget = "17"
     }
     buildFeatures {
-        compose = true
-    }
-    composeOptions {
-        kotlinCompilerExtensionVersion = "1.5.1"
-    }
-    packaging {
-        resources {
-            excludes += "/META-INF/{AL2.0,LGPL2.1}"
-        }
+        viewBinding = true // Bật ViewBinding để thao tác với giao diện dễ dàng
     }
 }
 
 dependencies {
-    implementation("androidx.core:core-ktx:1.10.1")
-    implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.6.1")
-    implementation("androidx.activity:activity-compose:1.7.2")
-    implementation(platform("androidx.compose:compose-bom:2023.06.01"))
-    implementation("androidx.compose.ui:ui")
-    implementation("androidx.compose.ui:ui-graphics")
-    implementation("androidx.compose.ui:ui-tooling-preview")
-    implementation("androidx.compose.material3:material3")
+    implementation("androidx.core:core-ktx:1.12.0")
+    implementation("androidx.appcompat:appcompat:1.6.1")
+    implementation("com.google.android.material:material:1.11.0")
+    implementation("androidx.constraintlayout:constraintlayout:2.1.4")
 
-    // CameraX dependencies for Sprint 1 Camera preview
-    val cameraVersion = "1.3.0-rc01"
+    // --- Thư viện CameraX Core ---
+    val cameraVersion = "1.3.1"
     implementation("androidx.camera:camera-core:$cameraVersion")
     implementation("androidx.camera:camera-camera2:$cameraVersion")
     implementation("androidx.camera:camera-lifecycle:$cameraVersion")
     implementation("androidx.camera:camera-view:$cameraVersion")
     implementation("androidx.camera:camera-extensions:$cameraVersion")
-
-    testImplementation("junit:junit:4.13.2")
-    androidTestImplementation("androidx.test.ext:junit:1.1.5")
-    androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")
-    androidTestImplementation(platform("androidx.compose:compose-bom:2023.06.01"))
-    androidTestImplementation("androidx.compose.ui:ui-test-junit4")
-    debugImplementation("androidx.compose.ui:ui-tooling")
-    debugImplementation("androidx.compose.ui:ui-test-manifest")
 }
diff --git a/android-project/app/src/main/java/com/photobooth/app/MainActivity.kt b/android-project/app/src/main/java/com/photobooth/app/MainActivity.kt
index ee640bd..d8496f4 100644
--- a/android-project/app/src/main/java/com/photobooth/app/MainActivity.kt
+++ b/android-project/app/src/main/java/com/photobooth/app/MainActivity.kt
@@ -1,44 +1,72 @@
 package com.photobooth.app
 
+import android.Manifest
+import android.content.pm.PackageManager
 import android.os.Bundle
-import androidx.activity.ComponentActivity
-import androidx.activity.compose.setContent
-import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.Surface
-import androidx.compose.material3.Text
-import androidx.compose.runtime.Composable
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.tooling.preview.Preview
+import android.widget.Toast
+import androidx.appcompat.app.AppCompatActivity
+import androidx.camera.core.CameraSelector
+import androidx.camera.core.Preview
+import androidx.camera.lifecycle.ProcessCameraProvider
+import androidx.core.app.ActivityCompat
+import androidx.core.content.ContextCompat
+import com.photobooth.app.databinding.ActivityMainBinding
+import java.util.concurrent.ExecutorService
+import java.util.concurrent.Executors
+
+class MainActivity : AppCompatActivity() {
+    private lateinit var binding: ActivityMainBinding
+    private lateinit var cameraExecutor: ExecutorService
 
-class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
-        super.onCreate(savedInstanceState: Bundle?)
-        setContent {
-            MaterialTheme {
-                Surface(
-                    modifier = Modifier.fillMaxSize(),
-                    color = MaterialTheme.colorScheme.background
-                ) {
-                    Greeting("Retro Photobooth")
-                }
-            }
+        super.onCreate(savedInstanceState)
+        binding = ActivityMainBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+
+        // Xin quyền Camera
+        if (allPermissionsGranted()) {
+            startCamera()
+        } else {
+            ActivityCompat.requestPermissions(this, REQUIRED_PERMISSIONS, REQUEST_CODE_PERMISSIONS)
         }
-    }
-}
-
-@Composable
-fun Greeting(name: String, modifier: Modifier = Modifier) {
-    Text(
-        text = "Welcome to $name!",
-        modifier = modifier
-    )
-}
-
-@Preview(showBackground = true)
-@Composable
-fun GreetingPreview() {
-    MaterialTheme {
-        Greeting("Retro Photobooth")
+
+        cameraExecutor = Executors.newSingleThreadExecutor()
+    }
+
+    private fun startCamera() {
+        val cameraProviderFuture = ProcessCameraProvider.getInstance(this)
+
+        cameraProviderFuture.addListener({
+            val cameraProvider: ProcessCameraProvider = cameraProviderFuture.get()
+
+            // Cấu hình Kính ngắm (Preview)
+            val preview = Preview.Builder().build().also {
+                it.setSurfaceProvider(binding.viewFinder.surfaceProvider)
+            }
+
+            // Chọn Camera Trước (Mặc định cho Photobooth)
+            val cameraSelector = CameraSelector.DEFAULT_FRONT_CAMERA
+
+            try {
+                cameraProvider.unbindAll()
+                cameraProvider.bindToLifecycle(this, cameraSelector, preview)
+            } catch (xc: Exception) {
+                Toast.makeText(this, "Không thể khởi động Camera", Toast.LENGTH_SHORT).show()
+            }
+        }, ContextCompat.getMainExecutor(this))
+    }
+
+    private fun allPermissionsGranted() = REQUIRED_PERMISSIONS.all {
+        ContextCompat.checkSelfPermission(baseContext, it) == PackageManager.PERMISSION_GRANTED
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        cameraExecutor.shutdown()
+    }
+
+    companion object {
+        private const val REQUEST_CODE_PERMISSIONS = 10
+        private val REQUIRED_PERMISSIONS = arrayOf(Manifest.permission.CAMERA)
     }
 }
diff --git a/android-project/app/src/main/res/layout/activity_main.xml b/android-project/app/src/main/res/layout/activity_main.xml
new file mode 100644
index 0000000..fafff42
--- /dev/null
+++ b/android-project/app/src/main/res/layout/activity_main.xml
@@ -0,0 +1,36 @@
+<?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"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="#121212">
+
+    <!-- Màn hình xem trước Camera -->
+    <androidx.camera.view.PreviewView
+        android:id="@+id/viewFinder"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        app:layout_constraintDimensionRatio="3:4"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toTopOf="@id/controlPanel" />
+
+    <!-- Bảng điều khiển phía dưới -->
+    <RelativeLayout
+        android:id="@+id/controlPanel"
+        android:layout_width="match_parent"
+        android:layout_height="120dp"
+        android:background="#000000"
+        app:layout_constraintBottom_toBottomOf="parent">
+
+        <!-- Nút chụp hình -->
+        <ImageButton
+            android:id="@+id/btnCapture"
+            android:layout_width="70dp"
+            android:layout_height="70dp"
+            android:layout_centerInParent="true"
+            android:background="@android:color/transparent"
+            android:src="@android:drawable/ic_menu_camera"
+            android:contentDescription="Capture Button" />
+    </RelativeLayout>
+
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/android-project/build.gradle.kts b/android-project/build.gradle.kts
index 95cbdb3..e1e81fa 100644
--- a/android-project/build.gradle.kts
+++ b/android-project/build.gradle.kts
@@ -1,5 +1,4 @@
-// Top-level build file where you can add configuration options common to all sub-projects/modules.
 plugins {
-    id("com.android.application") version "8.1.1" apply false
-    id("org.jetbrains.kotlin.android") version "1.9.0" apply false
+    id("com.android.application") version "8.2.2" apply false
+    id("org.jetbrains.kotlin.android") version "1.9.22" apply false
 }
diff --git a/android-project/settings.gradle.kts b/android-project/settings.gradle.kts
index 1807a71..9a48159 100644
--- a/android-project/settings.gradle.kts
+++ b/android-project/settings.gradle.kts
@@ -13,5 +13,5 @@ dependencyResolutionManagement {
     }
 }
 
-rootProject.name = "Retro Photobooth"
+rootProject.name = "RetroPhotobooth"
 include(":app")