3-ая УРА БД ЗАРАБОТАЛАААА

app/build.gradle.kts

@@ -1,3 +1,5 @@
+import org.jetbrains.kotlin.kapt3.base.Kapt.kapt
+
 plugins {
     id("com.android.application")
     id("org.jetbrains.kotlin.android")
@@ -70,6 +72,7 @@ dependencies {
     debugImplementation("androidx.compose.ui:ui-tooling")
     debugImplementation("androidx.compose.ui:ui-test-manifest")
 
+
     // Room
     val room_version = "2.5.2"
     implementation("androidx.room:room-runtime:$room_version")

app/src/main/java/com/example/myapplication/database/MobileDatabase.kt

@@ -1,3 +1,5 @@
+package com.example.myapplication.database
+
 import android.content.Context
 import android.graphics.BitmapFactory
 import android.util.Log
@@ -23,22 +25,19 @@ abstract class MobileAppDataBase : RoomDatabase() {
     abstract fun cardDao(): CardDao
 
     companion object {
-        private const val DB_NAME: String = "my-db"
+        private const val DB_NAME: String = "my-db.db"
 
         @Volatile
         private var INSTANCE: MobileAppDataBase? = null
 
         fun getInstance(appContext: Context): MobileAppDataBase {
             return INSTANCE ?: synchronized(this) {
-                INSTANCE?.let { return@let it } // Возвращаем INSTANCE, если он уже был создан
-
-                val instance = Room.databaseBuilder(
+                Room.databaseBuilder(
                     appContext,
                     MobileAppDataBase::class.java,
                     DB_NAME
                 )
-                    .fallbackToDestructiveMigration()
-                    .addCallback(object : RoomDatabase.Callback() {
+                    .addCallback(object : Callback() {
                         override fun onCreate(db: SupportSQLiteDatabase) {
                             super.onCreate(db)
                             CoroutineScope(Dispatchers.IO).launch {
@@ -46,12 +45,8 @@ abstract class MobileAppDataBase : RoomDatabase() {
                             }
                         }
                     })
-                    .also { INSTANCE = it.build() } // Сохраняем INSTANCE
                     .build()
-
-                Log.d("Database", "Database instance created")
-
-                instance // Возвращаем созданный instance
+                    .also { INSTANCE = it }
             }
         }
 
@@ -77,17 +72,43 @@ abstract class MobileAppDataBase : RoomDatabase() {
                 )
                 cardDao.insert(
                     Card(
-                        name = "Москоувич",
-                        location = "г. Москва",
+                        name = "Феррари Два",
+                        location = "г. Ульяновск",
                         image = BitmapFactory.decodeResource(
                             appContext.resources,
-                            R.drawable.moscowich_car3
+                            R.drawable.ferrari_laferrari_car2
                         ),
-                        mileage = 156771,
-                        price = 1000,
+                        mileage = 1233,
+                        price = 15000,
+                        userId = 2
+                    )
+                )
+                cardDao.insert(
+                    Card(
+                        name = "Феррари Имба",
+                        location = "г. Ульяновск",
+                        image = BitmapFactory.decodeResource(
+                            appContext.resources,
+                            R.drawable.ferrari_laferrari_car2
+                        ),
+                        mileage = 7322,
+                        price = 125000,
                         userId = 1
                     )
                 )
+                cardDao.insert(
+                    Card(
+                        name = "Феррари Два",
+                        location = "г. Ульяновск",
+                        image = BitmapFactory.decodeResource(
+                            appContext.resources,
+                            R.drawable.ferrari_laferrari_car2
+                        ),
+                        mileage = 1233,
+                        price = 15000,
+                        userId = 2
+                    )
+                )
             }
         }
     }

app/src/main/java/com/example/myapplication/database/dao/CardDao.kt

@@ -15,7 +15,7 @@ interface CardDao {
     fun getAll(): Flow<List<Card>>
 
     @Query("select * from cards where cards.id = :id")
-    fun getById(id: Int): Card?
+    fun getById(id: Int): Flow<Card?>
 
     @Query("select * from cards where cards.user_id = :userId")
     fun getByUserId(userId: Int): Flow<List<Card>>

app/src/main/java/com/example/myapplication/database/dao/UserDao.kt

@@ -19,7 +19,7 @@ interface UserDao {
     fun getAll(): Flow<List<User>>
 
     @Query("select * from users where users.id = :id")
-    fun getById(id: Int): User?
+    fun getById(id: Int): Flow<User?>
 
     @Insert(onConflict = OnConflictStrategy.IGNORE)
     suspend fun insert(user: User)

app/src/main/java/com/example/myapplication/screens/authorization.kt

@@ -31,6 +31,7 @@ import com.example.myapplication.R
 import com.example.myapplication.components.LoginField
 import com.example.myapplication.components.PasswordField
 import com.example.myapplication.components.navButton
+import com.example.myapplication.database.MobileAppDataBase
 import com.example.myapplication.database.entities.Card
 import com.example.myapplication.database.entities.User
 import kotlinx.coroutines.Dispatchers
@@ -43,14 +44,10 @@ fun Authorization(navController: NavHostController){
 
     LaunchedEffect(Unit) {
         withContext(Dispatchers.IO) {
-            try {
-                val database = MobileAppDataBase.getInstance(context.applicationContext)
+            val database = MobileAppDataBase.getInstance(context)
             database.userDao().getAll().collect { data ->
                 users.clear()
-                    users.addAll(data)
-                }
-            } catch (e: Exception) {
-                Log.e("DatabaseError", "Error accessing database", e)
+                data.forEach { users.add(it) }
             }
         }
     }

app/src/main/java/com/example/myapplication/screens/mainScreen.kt

@@ -37,6 +37,8 @@ import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.requiredHeight
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
 import androidx.compose.material3.AlertDialog
 import androidx.compose.material3.Button
 import androidx.compose.material3.ButtonDefaults
@@ -48,6 +50,7 @@ import androidx.compose.runtime.mutableStateListOf
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.unit.sp
 import com.example.myapplication.R
+import com.example.myapplication.database.MobileAppDataBase
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
@@ -60,39 +63,34 @@ fun MainScreen(navController: NavHostController) {
 
     LaunchedEffect(Unit) {
         withContext(Dispatchers.IO) {
-            try {
-                val database = MobileAppDataBase.getInstance(context.applicationContext)
+            val database = MobileAppDataBase.getInstance(context)
             database.cardDao().getAll().collect { data ->
                 cards.clear()
-                    cards.addAll(data)
-                }
-            } catch (e: Exception) {
-                Log.e("DatabaseError", "Error accessing database", e)
+                data.forEach { cards.add(it) }
             }
         }
     }
 
-
-    Box() {
-        Column(
-            modifier = Modifier
-                .fillMaxSize()
-                .background(Color.White)
-                .fillMaxHeight(0.9f)
-        ) {
+    Column {
+        Box(modifier = Modifier
+            .padding(horizontal = 10.dp)
+            .fillMaxHeight(0.9f)) {
+            Column()
+            {
                 DataListScroll(navController, cards)
             }
         }
         Column(
             modifier = Modifier
-                .fillMaxSize()
+                .fillMaxWidth()
                 .background(SkyBlue)
-                .fillMaxHeight(0.1f),
+                .weight(1f),
             verticalArrangement = Arrangement.Center
         ) {
             navBar(navController = navController)
         }
     }
+}
 
 @Composable
 fun <T : Any> DataListScroll(navController: NavHostController, dataList: List<T>){
@@ -274,7 +272,7 @@ fun addNewListItem(navController: NavHostController, destination: String){
             },
         shape = RoundedCornerShape(15.dp),
         colors = CardDefaults.cardColors(
-            containerColor = Color.Magenta
+            containerColor = SkyBlue
         ),
         elevation = CardDefaults.cardElevation(
             defaultElevation = 8.dp