Build offline voice shopping assistant

.gitignore

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+# Gradle
+.gradle/
+build/
+**/build/
+
+# Local configuration
+local.properties
+
+# IntelliJ/Android Studio
+.idea/
+*.iml
+
+# Logs
+*.log
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Keystores
+*.jks
+*.keystore
+
+# APKs
+*.apk
+*.ap_*
+
+# NDK
+.obj/
+.externalNativeBuild/
+.cxx/
+
+# Generated
+captures/
+outputs/
+
+# Gradle Wrapper JAR (optional, usually checked in)
+gradle/wrapper/gradle-wrapper.jar

app/build.gradle.kts

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+plugins {
+    id("com.android.application")
+    id("org.jetbrains.kotlin.android")
+    id("com.google.devtools.ksp")
+}
+
+android {
+    namespace = "com.example.voiceshopper"
+    compileSdk = 35
+
+    defaultConfig {
+        applicationId = "com.example.voiceshopper"
+        minSdk = 23
+        targetSdk = 35
+        versionCode = 1
+        versionName = "1.0.0"
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+        vectorDrawables.useSupportLibrary = true
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = true
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+        }
+        debug {
+            isMinifyEnabled = false
+        }
+    }
+
+    buildFeatures {
+        compose = true
+        buildConfig = true
+    }
+
+    composeOptions {
+        kotlinCompilerExtensionVersion = "1.5.14"
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+    kotlinOptions {
+        jvmTarget = "17"
+        freeCompilerArgs += listOf(
+            "-Xcontext-receivers"
+        )
+    }
+
+    packaging {
+        resources {
+            excludes += "/META-INF/{AL2.0,LGPL2.1}"
+        }
+    }
+
+    flavorDimensions += "features"
+    productFlavors {
+        create("baseline") {
+            dimension = "features"
+            buildConfigField("boolean", "FEATURE_GEOFENCE", "false")
+        }
+        create("geofence") {
+            dimension = "features"
+            buildConfigField("boolean", "FEATURE_GEOFENCE", "true")
+        }
+    }
+}
+
+val composeBom = platform("androidx.compose:compose-bom:2024.09.02")
+
+dependencies {
+    implementation(composeBom)
+    androidTestImplementation(composeBom)
+
+    // Compose
+    implementation("androidx.compose.ui:ui")
+    implementation("androidx.compose.material3:material3")
+    implementation("androidx.compose.ui:ui-tooling-preview")
+    debugImplementation("androidx.compose.ui:ui-tooling")
+    implementation("androidx.activity:activity-compose:1.9.2")
+    implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.8.4")
+    implementation("androidx.lifecycle:lifecycle-viewmodel-compose:2.8.4")
+    implementation("androidx.navigation:navigation-compose:2.8.0")
+
+    // Room + KSP
+    implementation("androidx.room:room-runtime:2.6.1")
+    implementation("androidx.room:room-ktx:2.6.1")
+    ksp("androidx.room:room-compiler:2.6.1")
+
+    // DataStore
+    implementation("androidx.datastore:datastore-preferences:1.1.1")
+
+    // Coroutines
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.8.1")
+
+    // Retrofit (stub)
+    implementation("com.squareup.retrofit2:retrofit:2.11.0")
+    implementation("com.squareup.retrofit2:converter-moshi:2.11.0")
+    implementation("com.squareup.moshi:moshi-kotlin:1.15.1")
+
+    // Play services for location (geofencing)
+    implementation("com.google.android.gms:play-services-location:21.3.0")
+
+    // WorkManager (optional for reminders)
+    implementation("androidx.work:work-runtime-ktx:2.9.1")
+
+    // Accompanist (optional permissions helper)
+    implementation("com.google.accompanist:accompanist-permissions:0.36.0")
+
+    // Testing
+    testImplementation("junit:junit:4.13.2")
+    androidTestImplementation("androidx.test.ext:junit:1.2.1")
+    androidTestImplementation("androidx.test.espresso:espresso-core:3.6.1")
+    androidTestImplementation("androidx.compose.ui:ui-test-junit4")
+}

app/proguard-rules.pro

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+-dontwarn kotlinx.coroutines.**
+-keep class kotlinx.coroutines.** { *; }
+-keepclassmembers class ** {
+    @android.webkit.JavascriptInterface <methods>;
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <uses-permission android:name="android.permission.RECORD_AUDIO" />
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
+
+    <application
+        android:name=".VoiceShoppingApp"
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.VoiceShopping">
+
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:theme="@style/Theme.VoiceShopping">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+        <service
+            android:name=".feature.geofencing.GeofenceTransitionsService"
+            android:exported="false"
+            android:foregroundServiceType="location" />
+
+        <receiver
+            android:name=".feature.geofencing.GeofenceBroadcastReceiver"
+            android:exported="false" />
+
+        <receiver
+            android:name=".util.notifications.BudgetWarningReceiver"
+            android:exported="false" />
+
+    </application>
+</manifest>

app/src/main/java/com/example/voiceshopper/MainActivity.kt

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+package com.example.voiceshopper
+
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.SideEffect
+import androidx.compose.ui.graphics.Color
+import androidx.core.view.WindowCompat
+import com.example.voiceshopper.ui.AppNavHost
+import com.example.voiceshopper.ui.theme.VoiceShoppingTheme
+
+class MainActivity : ComponentActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        WindowCompat.setDecorFitsSystemWindows(window, false)
+        setContent {
+            VoiceShoppingTheme {
+                Surface(color = MaterialTheme.colorScheme.background) {
+                    AppNav()
+                }
+            }
+        }
+    }
+}
+
+@Composable
+private fun AppNav() {
+    AppNavHost()
+}

app/src/main/java/com/example/voiceshopper/VoiceShoppingApp.kt

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+package com.example.voiceshopper
+
+import android.app.Application
+
+class VoiceShoppingApp : Application()

app/src/main/java/com/example/voiceshopper/data/ShoppingRepository.kt

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+package com.example.voiceshopper.data
+
+import android.content.Context
+import com.example.voiceshopper.data.db.AppDatabase
+import com.example.voiceshopper.data.db.ItemEntity
+import com.example.voiceshopper.data.db.ShoppingListEntity
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.flow.map
+
+class ShoppingRepository private constructor(private val db: AppDatabase) {
+
+    private val itemDao = db.itemDao()
+    private val listDao = db.shoppingListDao()
+
+    suspend fun getOrCreateCurrentList(): ShoppingListEntity {
+        val latest = listDao.getLatestList()
+        if (latest != null) return latest
+        val createdId = listDao.insert(
+            ShoppingListEntity(
+                name = "Today",
+                createdAt = System.currentTimeMillis(),
+                total = 0.0
+            )
+        )
+        return listDao.getLatestList()!!
+    }
+
+    fun observeHistory(): Flow<List<ShoppingListEntity>> = listDao.getHistory()
+
+    suspend fun createNewList(name: String = "Today"): ShoppingListEntity {
+        val id = listDao.insert(
+            ShoppingListEntity(
+                name = name,
+                createdAt = System.currentTimeMillis(),
+                total = 0.0
+            )
+        )
+        return listDao.getLatestList()!!
+    }
+
+    fun observeItems(listId: Long): Flow<List<ItemEntity>> = itemDao.getItemsForList(listId)
+
+    fun observePendingItems(listId: Long): Flow<List<ItemEntity>> = itemDao.getPendingItemsForList(listId)
+
+    fun observePendingTotal(listId: Long): Flow<Double> = itemDao.getPendingTotalForList(listId)
+
+    suspend fun addItem(
+        listId: Long,
+        name: String,
+        quantity: Double?,
+        unit: String?,
+        price: Double?,
+        owner: String?
+    ): Long {
+        val entity = ItemEntity(
+            name = name,
+            quantity = quantity,
+            unit = unit,
+            price = price,
+            owner = owner,
+            createdAt = System.currentTimeMillis(),
+            listId = listId,
+            bought = false
+        )
+        return itemDao.insert(entity)
+    }
+
+    suspend fun updateItem(item: ItemEntity) = itemDao.update(item)
+
+    suspend fun deleteItem(id: Long) = itemDao.deleteById(id)
+
+    suspend fun setBought(id: Long, bought: Boolean) = itemDao.setBought(id, bought)
+
+    companion object {
+        @Volatile private var INSTANCE: ShoppingRepository? = null
+        fun get(context: Context): ShoppingRepository = INSTANCE ?: synchronized(this) {
+            val db = AppDatabase.get(context)
+            INSTANCE ?: ShoppingRepository(db).also { INSTANCE = it }
+        }
+    }
+}

app/src/main/java/com/example/voiceshopper/data/db/AppDatabase.kt

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+package com.example.voiceshopper.data.db
+
+import android.content.Context
+import androidx.room.Database
+import androidx.room.Room
+import androidx.room.RoomDatabase
+import androidx.room.migration.Migration
+import androidx.sqlite.db.SupportSQLiteDatabase
+
+@Database(
+    entities = [ItemEntity::class, ShoppingListEntity::class],
+    version = 1,
+    exportSchema = true
+)
+abstract class AppDatabase : RoomDatabase() {
+    abstract fun itemDao(): ItemDao
+    abstract fun shoppingListDao(): ShoppingListDao
+
+    companion object {
+        @Volatile private var INSTANCE: AppDatabase? = null
+
+        fun get(context: Context): AppDatabase = INSTANCE ?: synchronized(this) {
+            INSTANCE ?: build(context).also { INSTANCE = it }
+        }
+
+        private fun build(context: Context): AppDatabase {
+            return Room.databaseBuilder(context, AppDatabase::class.java, "voice_shopping.db")
+                .fallbackToDestructiveMigration()
+                .addCallback(object : Callback() {
+                    override fun onCreate(db: SupportSQLiteDatabase) {
+                        super.onCreate(db)
+                        // Pre-populate a default shopping list named Today
+                        db.execSQL("INSERT INTO shopping_lists(name, createdAt, total) VALUES('Today', strftime('%s','now')*1000, 0.0)")
+                    }
+                })
+                .build()
+        }
+    }
+}