Unified Todo App Architecture: Data Model Refinement and Adapter Improvements

.gitignore

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+<<<<<<< HEAD
+# 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
+=======
+# Android Studio
+*.iml
+.gradle/
+build/
+local.properties
+.idea/
+
+# Compiled files
+*.class
+*.dex
+*.apk
+
+# OS generated files
+.DS_Store
+Thumbs.db
+
+# Logs
+*.log
+
+# Kotlin/Java
+*.jar
+*.war
+
+# Other directories
+node_modules/
+captures/
+.externalNativeBuild/
+.cxx/
+>>>>>>> pr-3-Santix1234-kotlinTodoApp

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/example/todoapp/data/TodoItem.kt

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+package com.example.todoapp.data
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+
+@Entity(tableName = "todo_items")
+data class TodoItem(
+    @PrimaryKey(autoGenerate = true)
+    val id: Long = 0,
+    val title: String,
+    val description: String? = null,
+    val isCompleted: Boolean = false,
+    val createdAt: Long = System.currentTimeMillis(),
+    val updatedAt: Long = System.currentTimeMillis()
+)

app/src/main/java/com/example/todoapp/database/TodoDao.kt

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+package com.example.todoapp.database
+
+import androidx.room.*
+import com.example.todoapp.data.TodoItem
+import kotlinx.coroutines.flow.Flow
+
+@Dao
+interface TodoDao {
+    @Query("SELECT * FROM todo_items")
+    fun getAllTodos(): Flow<List<TodoItem>>
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun insertTodo(todoItem: TodoItem): Long
+
+    @Update
+    suspend fun updateTodo(todoItem: TodoItem)
+
+    @Delete
+    suspend fun deleteTodo(todoItem: TodoItem)
+
+    @Query("UPDATE todo_items SET isCompleted = :completed, updatedAt = :timestamp WHERE id = :todoId")
+    suspend fun updateTodoCompletionStatus(todoId: Long, completed: Boolean, timestamp: Long = System.currentTimeMillis())
+}

app/src/main/java/com/example/todoapp/database/TodoDatabase.kt

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+package com.example.todoapp.database
+
+import android.content.Context
+import androidx.room.Database
+import androidx.room.Room
+import androidx.room.RoomDatabase
+import com.example.todoapp.data.TodoItem
+
+@Database(entities = [TodoItem::class], version = 1, exportSchema = false)
+abstract class TodoDatabase : RoomDatabase() {
+    abstract fun todoDao(): TodoDao
+
+    companion object {
+        @Volatile
+        private var INSTANCE: TodoDatabase? = null
+
+        fun getDatabase(context: Context): TodoDatabase {
+            return INSTANCE ?: synchronized(this) {
+                val instance = Room.databaseBuilder(
+                    context.applicationContext,
+                    TodoDatabase::class.java,
+                    "todo_database"
+                ).build()
+                INSTANCE = instance
+                instance
+            }
+        }
+    }
+}

app/src/main/java/com/example/todoapp/repository/TodoRepository.kt

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+package com.example.todoapp.repository
+
+import com.example.todoapp.data.TodoItem
+import com.example.todoapp.database.TodoDao
+import kotlinx.coroutines.flow.Flow
+
+class TodoRepository(private val todoDao: TodoDao) {
+    val allTodos: Flow<List<TodoItem>> = todoDao.getAllTodos()
+
+    suspend fun insert(todoItem: TodoItem) = todoDao.insertTodo(todoItem)
+
+    suspend fun update(todoItem: TodoItem) = todoDao.updateTodo(todoItem)
+
+    suspend fun delete(todoItem: TodoItem) = todoDao.deleteTodo(todoItem)
+
+    suspend fun updateCompletionStatus(todoId: Long, isCompleted: Boolean) {
+        todoDao.updateTodoCompletionStatus(todoId, isCompleted)
+    }
+}

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 ->
+                // Create a new Todo with updated completion status
+                val updatedTodo = todo.copy(isCompleted = isChecked)
+                onCompletionToggle(updatedTodo, 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
+
+import com.example.todoapp.data.TodoItem
+
+data class Todo(
+    val id: Long = 0,
+    val title: String,
+    val description: String? = null,
+    val isCompleted: Boolean = false,
+    val createdAt: Long = System.currentTimeMillis(),
+    val updatedAt: Long = System.currentTimeMillis()
+) {
+    // Conversion method to convert Todo to TodoItem
+    fun toTodoItem(): TodoItem {
+        return TodoItem(
+            id = id,
+            title = title,
+            description = description,
+            isCompleted = isCompleted,
+            createdAt = createdAt,
+            updatedAt = updatedAt
+        )
+    }
+
+    companion object {
+        // Conversion method to create Todo from TodoItem
+        fun fromTodoItem(todoItem: TodoItem): Todo {
+            return Todo(
+                id = todoItem.id,
+                title = todoItem.title,
+                description = todoItem.description,
+                isCompleted = todoItem.isCompleted,
+                createdAt = todoItem.createdAt,
+                updatedAt = todoItem.updatedAt
+            )
+        }
+    }
+}

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>