[WIP] Initial Project Setup and Infrastructure Preparation

.gitignore

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+# Built application files
+*.apk
+*.aar
+*.ap_
+*.aab
+
+# Files for the ART/Dalvik VM
+*.dex
+
+# Java class files
+*.class
+
+# Generated files
+bin/
+gen/
+out/
+
+# Gradle files
+.gradle/
+build/
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Proguard folder generated by Eclipse
+proguard/
+
+# Log Files
+*.log
+
+# Android Studio Navigation editor temp files
+.navigation/
+
+# Android Studio captures folder
+captures/
+
+# IntelliJ
+*.iml
+.idea/
+.idea/workspace.xml
+.idea/tasks.xml
+.idea/gradle.xml
+.idea/assetWizardSettings.xml
+.idea/dictionaries
+.idea/libraries
+.idea/jarRepositories.xml
+
+# Keystore files
+*.jks
+*.keystore
+
+# External native build folder generated in Android Studio 2.2 and later
+.externalNativeBuild
+.cxx/
+
+# Google Services (e.g. APIs or Firebase)
+google-services.json
+
+# Freeline
+freeline.py
+freeline/
+freeline_project_description.json
+
+# fastlane
+fastlane/report.xml
+fastlane/Preview.html
+fastlane/screenshots
+fastlane/test_output
+fastlane/readme.md
+
+# Version control
+vcs.xml
+
+# lint
+lint/intermediates/
+lint/generated/
+lint/outputs/
+lint/tmp/
+lint/reports/
+
+# Android Profiling
+*.hprof

app/build.gradle.kts

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+plugins {
+    id("com.android.application")
+    id("kotlin-android")
+}
+
+android {
+    compileSdk = 33
+
+    defaultConfig {
+        applicationId = "com.todoapp"
+        minSdk = 24
+        targetSdk = 33
+        versionCode = 1
+        versionName = "1.0"
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        getByName("release") {
+            isMinifyEnabled = false
+            proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_11
+        targetCompatibility = JavaVersion.VERSION_11
+    }
+
+    kotlinOptions {
+        jvmTarget = "11"
+    }
+}
+
+dependencies {
+    implementation("androidx.core:core-ktx:1.9.0")
+    implementation("androidx.appcompat:appcompat:1.6.1")
+    implementation("androidx.recyclerview:recyclerview:1.3.0")
+
+    // Testing dependencies
+    testImplementation("junit:junit:4.13.2")
+    testImplementation("org.mockito:mockito-core:4.8.0")
+    testImplementation("org.robolectric:robolectric:4.9")
+
+    androidTestImplementation("androidx.test.ext:junit:1.1.5")
+    androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")
+}

app/src/main/java/com/todoapp/adapter/TodoListAdapter.kt

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+package com.todoapp.adapter
+
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.CheckBox
+import android.widget.TextView
+import androidx.recyclerview.widget.DiffUtil
+import androidx.recyclerview.widget.ListAdapter
+import androidx.recyclerview.widget.RecyclerView
+import com.todoapp.R
+import com.todoapp.model.Todo
+
+class TodoListAdapter(
+    private val onItemClick: (Todo) -> Unit,
+    private val onCompletionToggle: (Todo, Boolean) -> Unit
+) : ListAdapter<Todo, TodoListAdapter.TodoViewHolder>(TodoDiffCallback()) {
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): TodoViewHolder {
+        val view = LayoutInflater.from(parent.context)
+            .inflate(R.layout.item_todo, parent, false)
+        return TodoViewHolder(view, onItemClick, onCompletionToggle)
+    }
+
+    override fun onBindViewHolder(holder: TodoViewHolder, position: Int) {
+        holder.bind(getItem(position))
+    }
+
+    class TodoViewHolder(
+        itemView: View,
+        private val onItemClick: (Todo) -> Unit,
+        private val onCompletionToggle: (Todo, Boolean) -> Unit
+    ) : RecyclerView.ViewHolder(itemView) {
+        private val titleTextView: TextView = itemView.findViewById(R.id.todo_title)
+        private val completedCheckBox: CheckBox = itemView.findViewById(R.id.todo_completed_checkbox)
+
+        fun bind(todo: Todo) {
+            titleTextView.text = todo.title
+            completedCheckBox.isChecked = todo.isCompleted
+
+            itemView.setOnClickListener { onItemClick(todo) }
+
+            completedCheckBox.setOnCheckedChangeListener { _, isChecked ->
+                onCompletionToggle(todo, isChecked)
+            }
+        }
+    }
+
+    // DiffUtil for efficient list updates
+    class TodoDiffCallback : DiffUtil.ItemCallback<Todo>() {
+        override fun areItemsTheSame(oldItem: Todo, newItem: Todo): Boolean {
+            return oldItem.id == newItem.id
+        }
+
+        override fun areContentsTheSame(oldItem: Todo, newItem: Todo): Boolean {
+            return oldItem == newItem
+        }
+    }
+}

app/src/main/java/com/todoapp/model/Todo.kt

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+package com.todoapp.model
+
+data class Todo(
+    val id: Long = 0,
+    val title: String,
+    val description: String? = null,
+    val isCompleted: Boolean = false
+)

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

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+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="horizontal"
+    android:padding="16dp"
+    android:gravity="center_vertical">
+
+    <CheckBox
+        android:id="@+id/todo_completed_checkbox"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginEnd="16dp" />
+
+    <TextView
+        android:id="@+id/todo_title"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_weight="1"
+        android:textSize="16sp" />
+
+</LinearLayout>

app/src/test/java/com/todoapp/adapter/TodoListAdapterTest.kt

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+package com.todoapp.adapter
+
+import android.view.View
+import androidx.recyclerview.widget.RecyclerView
+import com.todoapp.R
+import com.todoapp.model.Todo
+import org.junit.Assert.*
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.mockito.Mock
+import org.mockito.MockitoAnnotations
+import org.robolectric.RobolectricTestRunner
+import org.robolectric.RuntimeEnvironment
+
+@RunWith(RobolectricTestRunner::class)
+class TodoListAdapterTest {
+
+    private lateinit var adapter: TodoListAdapter
+
+    @Before
+    fun setup() {
+        MockitoAnnotations.openMocks(this)
+        adapter = TodoListAdapter(
+            onItemClick = {},
+            onCompletionToggle = { _, _ -> }
+        )
+    }
+
+    @Test
+    fun testAdapterItemCount() {
+        val todos = listOf(
+            Todo(1, "Test Todo 1"),
+            Todo(2, "Test Todo 2")
+        )
+        adapter.submitList(todos)
+        assertEquals(2, adapter.itemCount)
+    }
+
+    @Test
+    fun testTodoCompletionToggle() {
+        var toggledTodo: Todo? = null
+        var toggledStatus: Boolean? = null
+
+        adapter = TodoListAdapter(
+            onItemClick = {},
+            onCompletionToggle = { todo, isCompleted ->
+                toggledTodo = todo
+                toggledStatus = isCompleted
+            }
+        )
+
+        val todo = Todo(1, "Test Todo", isCompleted = false)
+        adapter.submitList(listOf(todo))
+
+        val viewHolder = adapter.onCreateViewHolder(
+            RecyclerView(RuntimeEnvironment.getApplication()),
+            0
+        )
+
+        val checkBox = viewHolder.itemView.findViewById<View>(R.id.todo_completed_checkbox)
+        checkBox.performClick()
+
+        assertEquals(todo, toggledTodo)
+        assertEquals(true, toggledStatus)
+    }
+}