Сдал

app/build.gradle.kts

@@ -76,4 +76,8 @@ dependencies {
     ksp("androidx.room:room-compiler:$room_version")
     implementation("androidx.room:room-ktx:$room_version")
     implementation("androidx.room:room-paging:$room_version")
+
+    //Paging
+    implementation ("androidx.paging:paging-compose:3.2.1")
+    implementation ("androidx.paging:paging-runtime:3.2.1")
 }

app/src/main/AndroidManifest.xml

@@ -3,6 +3,7 @@
     xmlns:tools="http://schemas.android.com/tools">
 
     <application
+        android:name=".MobileApp"
         android:allowBackup="true"
         android:dataExtractionRules="@xml/data_extraction_rules"
         android:fullBackupContent="@xml/backup_rules"

app/src/main/java/com/example/mobileapp/MobileApp.kt

@@ -0,0 +1,12 @@
+package com.example.mobileapp
+
+import android.app.Application
+
+class MobileApp: Application() {
+    lateinit var container: MobileAppContainer
+
+    override fun onCreate() {
+        super.onCreate()
+        container = MobileAppDataContainer(this)
+    }
+}

app/src/main/java/com/example/mobileapp/MobileAppContainer.kt

@@ -0,0 +1,34 @@
+package com.example.mobileapp
+
+import android.content.Context
+import com.example.mobileapp.database.MobileAppDataBase
+import com.example.mobileapp.database.repositories.MailRepository
+import com.example.mobileapp.database.repositories.OfflineMailRepository
+import com.example.mobileapp.database.repositories.OfflineStoryRepository
+import com.example.mobileapp.database.repositories.OfflineUserRepository
+import com.example.mobileapp.database.repositories.StoryRepository
+import com.example.mobileapp.database.repositories.UserRepository
+
+interface MobileAppContainer {
+    val mailRepository: MailRepository
+    val storyRepository: StoryRepository
+    val userRepository: UserRepository
+}
+
+class MobileAppDataContainer(private val context: Context): MobileAppContainer {
+    override val mailRepository: MailRepository by lazy {
+        OfflineMailRepository(MobileAppDataBase.getInstance(context).mailDao())
+    }
+
+    override val storyRepository: StoryRepository by lazy {
+        OfflineStoryRepository(MobileAppDataBase.getInstance(context).storyDao())
+    }
+
+    override val userRepository: UserRepository by lazy {
+        OfflineUserRepository(MobileAppDataBase.getInstance(context).userDao())
+    }
+
+    companion object{
+        const val TIMEOUT = 5000L
+    }
+}

app/src/main/java/com/example/mobileapp/components/InputContent.kt

@@ -82,13 +82,14 @@ fun PasswordInputField(label: String, startValue: String? = null, onPasswordChan
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
-fun SearchInputField(){
+fun SearchInputField(onTextChanged: (String) -> Unit){
     var text = remember { mutableStateOf("") }
 
     OutlinedTextField(
         value = text.value,
         onValueChange = {
             text.value = it
+            onTextChanged(it)
         },
         leadingIcon = {
             Icon(

app/src/main/java/com/example/mobileapp/components/ListContent.kt

@@ -14,6 +14,8 @@ import androidx.compose.foundation.layout.requiredHeight
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.grid.GridCells
+import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
 import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.AlertDialog
@@ -36,15 +38,22 @@ import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
+import androidx.lifecycle.viewmodel.compose.viewModel
 import androidx.navigation.NavHostController
+import androidx.paging.compose.LazyPagingItems
+import androidx.paging.compose.itemKey
 import com.example.mobileapp.R
 import com.example.mobileapp.database.MobileAppDataBase
 import com.example.mobileapp.database.entities.Mail
 import com.example.mobileapp.database.entities.Story
+import com.example.mobileapp.database.viewmodels.MobileAppViewModelProvider
+import com.example.mobileapp.database.viewmodels.StoryViewModel
+import com.example.mobileapp.database.viewmodels.UserViewModel
 import com.example.mobileapp.ui.theme.BackgroundItem2
 import com.example.mobileapp.ui.theme.ButtonColor1
 import com.example.mobileapp.ui.theme.ButtonColor2
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.collect
 import kotlinx.coroutines.withContext
 import java.text.SimpleDateFormat
 import java.util.Date
@@ -67,7 +76,7 @@ fun <T : Any> DataListScroll(navController: NavHostController, dataList: List<T>
         items(dataList){ item ->
             when(item){
                 is Story -> StoryListItem(item = item, navController = navController)
-                is Mail -> MailListItem(item = item)
+                is Mail -> MailListItem(item = item, navController = navController)
             }
         }
     }
@@ -78,9 +87,11 @@ inline fun <reified T> List<*>.isListOf(): Boolean {
 }
 
 @Composable
-fun StoryListItem(item: Story, navController: NavHostController){
-    val context = LocalContext.current
-
+fun StoryListItem(item: Story, navController: NavHostController,
+                  isReadOnly: Boolean? = false,
+                  storyViewModel: StoryViewModel = viewModel(
+                      factory = MobileAppViewModelProvider.Factory
+                  )) {
     val isExpanded = remember {
         mutableStateOf(false)
     }
@@ -89,10 +100,6 @@ fun StoryListItem(item: Story, navController: NavHostController){
         mutableStateOf(false)
     }
 
-    val delete = remember {
-        mutableStateOf(false)
-    }
-
     Card(
         modifier = Modifier
             .fillMaxWidth()
@@ -135,16 +142,24 @@ fun StoryListItem(item: Story, navController: NavHostController){
                 visible = isExpanded.value,
                 modifier = Modifier.fillMaxWidth()
             ) {
-                Row(
-                    modifier = Modifier.fillMaxWidth(),
-                    horizontalArrangement = Arrangement.End
-                ){
-                    DataListItemButton("Изменить", ButtonColor2, Color.White, onClickAction = {
-                        navController.navigate("editstory/${item.id}")
-                    })
-                    DataListItemButton("Удалить", Color.Red, Color.White, onClickAction = {
-                        showDialog.value = !showDialog.value
-                    })
+                if (isReadOnly!!){
+                    DataListItemButton(label = "Подробнее", backgroundColor = ButtonColor2,
+                        textColor = Color.White, onClickAction = {
+                            navController.navigate("viewstory/${item.id}")
+                        })
+                }
+                else{
+                    Row(
+                        modifier = Modifier.fillMaxWidth(),
+                        horizontalArrangement = Arrangement.End
+                    ){
+                        DataListItemButton("Изменить", ButtonColor2, Color.White, onClickAction = {
+                            navController.navigate("editstory/${item.id}")
+                        })
+                        DataListItemButton("Удалить", Color.Red, Color.White, onClickAction = {
+                            showDialog.value = !showDialog.value
+                        })
+                    }
                 }
             }
         }
@@ -153,22 +168,12 @@ fun StoryListItem(item: Story, navController: NavHostController){
     if(showDialog.value) {
         DialogWindow(label = "Подтверждение",
             message = "Вы уверены что хотите удалить запись?", onConfirmAction = {
-                delete.value = !delete.value
+                storyViewModel.deleteStory(item)
                 showDialog.value = !showDialog.value
         }, onDismissAction = {
                 showDialog.value = !showDialog.value
         })
     }
-
-    if(delete.value) {
-        LaunchedEffect(Unit){
-            withContext(Dispatchers.IO){
-                MobileAppDataBase.getInstance(context).storyDao().delete(item)
-            }
-        }
-        delete.value = !delete.value
-        navController.navigate("story")
-    }
 }
 
 @Composable
@@ -190,11 +195,24 @@ fun DataListItemButton(label: String, backgroundColor: Color, textColor: Color,
 }
 
 @Composable
-fun MailListItem(item: Mail){
+fun MailListItem(item: Mail, navController: NavHostController,
+                 userViewModel: UserViewModel = viewModel(
+                     factory = MobileAppViewModelProvider.Factory
+                 )) {
     val isExpanded = remember {
         mutableStateOf(false)
     }
 
+    val userName = remember { mutableStateOf("") }
+
+    LaunchedEffect(Unit){
+        userViewModel.getUser(item.userId).collect {
+            if (it != null) {
+                userName.value = it.email
+            }
+        }
+    }
+
     Card(
         modifier = Modifier
             .fillMaxWidth()
@@ -226,7 +244,7 @@ fun MailListItem(item: Mail){
                     modifier = Modifier.padding(8.dp)
                 ){
                     Text(
-                        text = "item.username | ${dateFormat.format(Date(item.postdate!!))}",
+                        text = "${userName.value} | ${dateFormat.format(Date(item.postdate!!))}",
                         fontSize = 20.sp,
                         fontWeight = FontWeight.Bold)
                     Text(text = item.message)
@@ -236,22 +254,10 @@ fun MailListItem(item: Mail){
                 visible = isExpanded.value,
                 modifier = Modifier.fillMaxWidth()
             ) {
-                Button(
-                    onClick = { /* Действие при нажатии кнопки */ },
-                    modifier = Modifier
-                        .requiredHeight(64.dp)
-                        .fillMaxWidth(),
-                    shape = RoundedCornerShape(10.dp),
-                    colors = ButtonDefaults.buttonColors(
-                        containerColor = ButtonColor2
-                    )
-                ) {
-                    Text(
-                        text = "Подробнее",
-                        color = Color.White,
-                        fontSize = 18.sp,
-                    )
-                }
+                DataListItemButton(label = "Подробнее", backgroundColor = ButtonColor2,
+                    textColor = Color.White, onClickAction = {
+                        navController.navigate("viewmail/${item.id}")
+                })
             }
         }
     }

app/src/main/java/com/example/mobileapp/components/NavigationBar.kt

@@ -18,13 +18,17 @@ import androidx.compose.material3.NavigationBar
 import androidx.compose.material3.NavigationBarItem
 import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Text
+import androidx.compose.material3.TopAppBar
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.text.font.Font
+import androidx.compose.ui.text.font.FontFamily
 import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.navigation.NavHostController
@@ -37,11 +41,13 @@ import com.example.mobileapp.screens.Authorization
 import com.example.mobileapp.screens.EditMailScreen
 import com.example.mobileapp.screens.EditStoryScreen
 import com.example.mobileapp.screens.EditUserScreen
-import com.example.mobileapp.screens.ListDataScreen
 import com.example.mobileapp.screens.ListMailScreen
+import com.example.mobileapp.screens.ListStoryScreen
+import com.example.mobileapp.screens.MailViewScreen
 import com.example.mobileapp.screens.MainScreen
 import com.example.mobileapp.screens.Registration
 import com.example.mobileapp.screens.SettingsScreen
+import com.example.mobileapp.screens.StoryViewScreen
 
 val navBarItems = listOf(
     NavBarItem(route = "main", label = "Главная", icon = R.drawable.home),
@@ -53,9 +59,32 @@ val navBarItems = listOf(
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun NavBar(navController: NavHostController) {
+    val topBarState = rememberSaveable { (mutableStateOf(false)) }
     val bottomBarState = rememberSaveable { (mutableStateOf(false)) }
 
     Scaffold(
+        topBar = {
+            AnimatedVisibility(
+                visible = topBarState.value,
+                enter = slideInVertically(initialOffsetY = { it }),
+                exit = slideOutVertically(targetOffsetY = { it }),
+                content = {
+                    TopAppBar(
+                        title = {
+                            Text(
+                                text = "Storyteller!",
+                                textAlign = TextAlign.Center,
+                                fontFamily = FontFamily(
+                                    Font(
+                                        R.font.irishgrover_regular, FontWeight.Bold
+                                    )
+                                )
+                            )
+                        }
+                    )
+                }
+            )
+        },
         bottomBar = {
             AnimatedVisibility(
                 visible = bottomBarState.value,
@@ -98,30 +127,37 @@ fun NavBar(navController: NavHostController) {
             modifier = Modifier.padding(innerPaddings)
         ) {
             composable("authorization"){
+                topBarState.value = true
                 bottomBarState.value = false
                 Authorization(navController = navController)
             }
             composable("registration"){
+                topBarState.value = true
                 bottomBarState.value = false
                 Registration(navController = navController)
             }
             composable("main"){
+                topBarState.value = false
                 bottomBarState.value = true
                 MainScreen(navController = navController)
             }
             composable("story"){
+                topBarState.value = false
                 bottomBarState.value = true
-                ListDataScreen(navController = navController)
+                ListStoryScreen(navController = navController)
             }
             composable("mail"){
+                topBarState.value = false
                 bottomBarState.value = true
                 ListMailScreen(navController = navController)
             }
             composable("settings"){
+                topBarState.value = true
                 bottomBarState.value = true
                 SettingsScreen(navController = navController)
             }
             composable("editstory"){ // Без аргумента
+                topBarState.value = false
                 bottomBarState.value = false
                 EditStoryScreen(navController = navController)
             }
@@ -130,18 +166,41 @@ fun NavBar(navController: NavHostController) {
                 arguments = listOf(navArgument("id") { type = NavType.IntType }) //С аргументом
             ) { backStackEntry ->
                 backStackEntry.arguments?.let {
+                    topBarState.value = false
                     bottomBarState.value = false
                     EditStoryScreen(navController = navController, storyId = it.getInt("id"))
                 }
             }
             composable("editmail"){ // Без аргумента
+                topBarState.value = false
                 bottomBarState.value = false
                 EditMailScreen(navController = navController)
             }
             composable("edituser"){
+                topBarState.value = false
                 bottomBarState.value = false
                 EditUserScreen(navController = navController)
             }
+            composable(
+                "viewstory/{id}",
+                arguments = listOf(navArgument("id") { type = NavType.IntType }) //С аргументом
+            ) { backStackEntry ->
+                backStackEntry.arguments?.let {
+                    topBarState.value = false
+                    bottomBarState.value = false
+                    StoryViewScreen(navController = navController, storyId = it.getInt("id"))
+                }
+            }
+            composable(
+                "viewmail/{id}",
+                arguments = listOf(navArgument("id") { type = NavType.IntType }) //С аргументом
+            ) { backStackEntry ->
+                backStackEntry.arguments?.let {
+                    topBarState.value = false
+                    bottomBarState.value = false
+                    MailViewScreen(navController = navController, mailId = it.getInt("id"))
+                }
+            }
         }
     }
 }

app/src/main/java/com/example/mobileapp/database/MobileAppDataBase.kt

@@ -45,8 +45,16 @@ abstract class MobileAppDataBase : RoomDatabase() {
                     cover = BitmapFactory.decodeResource(appContext.resources, R.drawable.king), userId = 2))
 
                 val mailDao = database.mailDao()
-                mailDao.insert(Mail(message = "Выложил новые страницы", userId = 1))
-                mailDao.insert(Mail(message = "Меня отменили в Твиттере", userId = 2))
+                for (i in 0..50){
+                    if (i % 2 == 0){
+                        mailDao.insert(Mail(message = "Выложил новые страницы", userId = 1))
+                    }
+                    else{
+                        mailDao.insert(Mail(message = "Меня отменили в Твиттере", userId = 2))
+                    }
+                }
+                /*mailDao.insert(Mail(message = "Выложил новые страницы", userId = 1))
+                mailDao.insert(Mail(message = "Меня отменили в Твиттере", userId = 2))*/
             }
         }
 

app/src/main/java/com/example/mobileapp/database/dao/MailDao.kt

@@ -1,5 +1,6 @@
 package com.example.mobileapp.database.dao
 
+import androidx.paging.PagingSource
 import androidx.room.Dao
 import androidx.room.Delete
 import androidx.room.Insert
@@ -7,15 +8,16 @@ import androidx.room.OnConflictStrategy
 import androidx.room.Query
 import androidx.room.Update
 import com.example.mobileapp.database.entities.Mail
+import com.example.mobileapp.database.entities.Story
 import kotlinx.coroutines.flow.Flow
 
 @Dao
 interface MailDao {
-    @Query("select * from mails")
-    fun getAll(): Flow<List<Mail>>
+    @Query("select * from mails order by id desc")
+    fun getAll(): PagingSource<Int, Mail>
 
     @Query("select * from mails where mails.id = :id")
-    fun getById(id: Int): Mail?
+    fun getById(id: Int): Flow<Mail?>
 
     @Insert(onConflict = OnConflictStrategy.IGNORE)
     suspend fun insert(mail: Mail)

app/src/main/java/com/example/mobileapp/database/dao/StoryDao.kt

@@ -1,5 +1,6 @@
 package com.example.mobileapp.database.dao
 
+import androidx.paging.PagingSource
 import androidx.room.Dao
 import androidx.room.Delete
 import androidx.room.Insert
@@ -11,14 +12,14 @@ import kotlinx.coroutines.flow.Flow
 
 @Dao
 interface StoryDao {
-    @Query("select * from stories")
-    fun getAll(): Flow<List<Story>>
+    @Query("select * from stories order by id desc")
+    fun getAll(): PagingSource<Int, Story>
 
     @Query("select * from stories where stories.id = :id")
-    fun getById(id: Int): Story?
+    fun getById(id: Int): Flow<Story?>
 
-    @Query("select * from stories where stories.user_id = :userId")
-    fun getByUserId(userId: Int): Flow<List<Story>>
+    @Query("select * from stories where stories.user_id = :userId order by stories.id desc")
+    fun getByUserId(userId: Int): PagingSource<Int, Story>
 
     @Insert(onConflict = OnConflictStrategy.IGNORE)
     suspend fun insert(story: Story)

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

@@ -12,10 +12,13 @@ import kotlinx.coroutines.flow.Flow
 @Dao
 interface UserDao {
     @Query("select * from users")
-    fun getAll():Flow<List<User>>
+    fun getAll(): Flow<List<User>>
 
     @Query("select * from users where users.id = :id")
-    fun getById(id: Int): User?
+    fun getById(id: Int): Flow<User?>
+
+    @Query("select * from users where users.login = :login")
+    suspend fun getByLogin(login: String): User?
 
     @Insert(onConflict = OnConflictStrategy.IGNORE)
     suspend fun insert(user: User)

app/src/main/java/com/example/mobileapp/database/repositories/MailRepository.kt

@@ -0,0 +1,17 @@
+package com.example.mobileapp.database.repositories
+
+import androidx.paging.PagingData
+import com.example.mobileapp.database.entities.Mail
+import kotlinx.coroutines.flow.Flow
+
+interface MailRepository {
+    fun getAllMails(): Flow<PagingData<Mail>>
+
+    fun getMail(id: Int):  Flow<Mail?>
+
+    suspend fun insertMail(mail: Mail)
+
+    suspend fun updateMail(mail: Mail)
+
+    suspend fun deleteMail(mail: Mail)
+}

app/src/main/java/com/example/mobileapp/database/repositories/OfflineMailRepository.kt

@@ -0,0 +1,33 @@
+package com.example.mobileapp.database.repositories
+
+import androidx.paging.Pager
+import androidx.paging.PagingConfig
+import androidx.paging.PagingData
+import com.example.mobileapp.database.dao.MailDao
+import com.example.mobileapp.database.entities.Mail
+import kotlinx.coroutines.flow.Flow
+
+class OfflineMailRepository(private val mailDao: MailDao): MailRepository {
+    override fun getAllMails(): Flow<PagingData<Mail>> {
+        return Pager(
+            config = PagingConfig(
+                pageSize = 8,
+                prefetchDistance = 2,
+                enablePlaceholders = true,
+                initialLoadSize = 12,
+                maxSize = 24
+            ),
+            pagingSourceFactory = {
+                mailDao.getAll()
+            }
+        ).flow
+    }
+
+    override fun getMail(id: Int):  Flow<Mail?> = mailDao.getById(id)
+
+    override suspend fun insertMail(mail: Mail) = mailDao.insert(mail)
+
+    override suspend fun updateMail(mail: Mail) = mailDao.update(mail)
+
+    override suspend fun deleteMail(mail: Mail) = mailDao.delete(mail)
+}

app/src/main/java/com/example/mobileapp/database/repositories/OfflineStoryRepository.kt

@@ -0,0 +1,48 @@
+package com.example.mobileapp.database.repositories
+
+import androidx.paging.Pager
+import androidx.paging.PagingConfig
+import androidx.paging.PagingData
+import com.example.mobileapp.database.dao.StoryDao
+import com.example.mobileapp.database.entities.Story
+import kotlinx.coroutines.flow.Flow
+
+class OfflineStoryRepository(private val storyDao: StoryDao): StoryRepository {
+    override fun getAllStories(): Flow<PagingData<Story>> {
+        return Pager(
+            config = PagingConfig(
+                pageSize = 5,
+                prefetchDistance = 1,
+                enablePlaceholders = true,
+                initialLoadSize = 10,
+                maxSize = 15
+            ),
+            pagingSourceFactory = {
+                storyDao.getAll()
+            }
+        ).flow
+    }
+
+    override fun getStoriesByUserId(userId: Int): Flow<PagingData<Story>> {
+        return Pager(
+            config = PagingConfig(
+                pageSize = 5,
+                prefetchDistance = 1,
+                enablePlaceholders = true,
+                initialLoadSize = 10,
+                maxSize = 15
+            ),
+            pagingSourceFactory = {
+                storyDao.getByUserId(userId)
+            }
+        ).flow
+    }
+
+    override fun getStoryById(id: Int):  Flow<Story?> = storyDao.getById(id)
+
+    override suspend fun insertStory(story: Story) = storyDao.insert(story)
+
+    override suspend fun updateStory(story: Story) = storyDao.update(story)
+
+    override suspend fun deleteStory(story: Story) = storyDao.delete(story)
+}

app/src/main/java/com/example/mobileapp/database/repositories/OfflineUserRepository.kt

@@ -0,0 +1,19 @@
+package com.example.mobileapp.database.repositories
+
+import com.example.mobileapp.database.dao.UserDao
+import com.example.mobileapp.database.entities.User
+import kotlinx.coroutines.flow.Flow
+
+class OfflineUserRepository(private val userDao: UserDao): UserRepository {
+    override fun getAllUsers(): Flow<List<User>> = userDao.getAll()
+
+    override fun getUser(id: Int): Flow<User?> = userDao.getById(id)
+
+    override suspend fun getUserByLogin(login: String): User? = userDao.getByLogin(login)
+
+    override suspend fun insertUser(user: User) = userDao.insert(user)
+
+    override suspend fun updateUser(user: User) = userDao.update(user)
+
+    override suspend fun deleteUser(user: User) = userDao.delete(user)
+}

app/src/main/java/com/example/mobileapp/database/repositories/StoryRepository.kt

@@ -0,0 +1,20 @@
+package com.example.mobileapp.database.repositories
+
+import androidx.paging.PagingData
+import androidx.paging.PagingSource
+import com.example.mobileapp.database.entities.Story
+import kotlinx.coroutines.flow.Flow
+
+interface StoryRepository {
+    fun getAllStories(): Flow<PagingData<Story>>
+
+    fun getStoriesByUserId(userId: Int): Flow<PagingData<Story>>
+
+    fun getStoryById(id: Int):  Flow<Story?>
+
+    suspend fun insertStory(story: Story)
+
+    suspend fun updateStory(story: Story)
+
+    suspend fun deleteStory(story: Story)
+}

app/src/main/java/com/example/mobileapp/database/repositories/UserRepository.kt

@@ -0,0 +1,18 @@
+package com.example.mobileapp.database.repositories
+
+import com.example.mobileapp.database.entities.User
+import kotlinx.coroutines.flow.Flow
+
+interface UserRepository {
+    fun getAllUsers(): Flow<List<User>>
+
+    fun getUser(id: Int):  Flow<User?>
+
+    suspend fun getUserByLogin(login: String): User?
+
+    suspend fun insertUser(user: User)
+
+    suspend fun updateUser(user: User)
+
+    suspend fun deleteUser(user: User)
+}

app/src/main/java/com/example/mobileapp/database/viewmodels/MailViewModel.kt

@@ -0,0 +1,28 @@
+package com.example.mobileapp.database.viewmodels
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import androidx.paging.PagingData
+import androidx.paging.cachedIn
+import com.example.mobileapp.database.entities.Mail
+import com.example.mobileapp.database.repositories.MailRepository
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.launch
+
+class MailViewModel(private val mailRepository: MailRepository): ViewModel() {
+    val getAllMails: Flow<PagingData<Mail>> = mailRepository.getAllMails().cachedIn(viewModelScope)
+
+    fun getMail(id: Int):  Flow<Mail?> = mailRepository.getMail(id)
+
+    fun insertMail(mail: Mail) = viewModelScope.launch {
+        mailRepository.insertMail(mail)
+    }
+
+    fun updateMail(mail: Mail) = viewModelScope.launch {
+        mailRepository.updateMail(mail)
+    }
+
+    fun deleteMail(mail: Mail) = viewModelScope.launch {
+        mailRepository.deleteMail(mail)
+    }
+}

app/src/main/java/com/example/mobileapp/database/viewmodels/MobileAppViewModelProvider.kt

@@ -0,0 +1,24 @@
+package com.example.mobileapp.database.viewmodels
+
+import androidx.lifecycle.ViewModelProvider
+import androidx.lifecycle.viewmodel.CreationExtras
+import androidx.lifecycle.viewmodel.initializer
+import androidx.lifecycle.viewmodel.viewModelFactory
+import com.example.mobileapp.MobileApp
+
+object MobileAppViewModelProvider {
+    val Factory = viewModelFactory {
+        initializer {
+            MailViewModel(app().container.mailRepository)
+        }
+        initializer {
+            StoryViewModel(app().container.storyRepository)
+        }
+        initializer {
+            UserViewModel(app().container.userRepository)
+        }
+    }
+}
+
+fun CreationExtras.app(): MobileApp =
+    (this[ViewModelProvider.AndroidViewModelFactory.APPLICATION_KEY] as MobileApp)

app/src/main/java/com/example/mobileapp/database/viewmodels/StoryViewModel.kt

@@ -0,0 +1,31 @@
+package com.example.mobileapp.database.viewmodels
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import androidx.paging.PagingData
+import androidx.paging.cachedIn
+import com.example.mobileapp.database.entities.Story
+import com.example.mobileapp.database.repositories.StoryRepository
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.launch
+
+class StoryViewModel(private val storyRepository: StoryRepository): ViewModel() {
+
+    val getAllStories: Flow<PagingData<Story>> = storyRepository.getAllStories().cachedIn(viewModelScope)
+
+    fun getStoryById(id: Int): Flow<Story?> = storyRepository.getStoryById(id)
+
+    fun getStoriesByUserId(userId: Int): Flow<PagingData<Story>> = storyRepository.getStoriesByUserId(userId).cachedIn(viewModelScope)
+
+    fun insertStory(story: Story) = viewModelScope.launch {
+        storyRepository.insertStory(story)
+    }
+
+    fun updateStory(story: Story) = viewModelScope.launch {
+        storyRepository.updateStory(story)
+    }
+
+    fun deleteStory(story: Story) = viewModelScope.launch {
+        storyRepository.deleteStory(story)
+    }
+}

app/src/main/java/com/example/mobileapp/database/viewmodels/UserViewModel.kt

@@ -0,0 +1,65 @@
+package com.example.mobileapp.database.viewmodels
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import com.example.mobileapp.GlobalUser
+import com.example.mobileapp.database.entities.User
+import com.example.mobileapp.database.repositories.UserRepository
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.launch
+
+class UserViewModel(private val userRepository: UserRepository): ViewModel() {
+    val getAllUsers = userRepository.getAllUsers()
+
+    fun getUser(id: Int): Flow<User?> = userRepository.getUser(id)
+
+    fun updateUser(user: User) = viewModelScope.launch {
+        if (user.login.isEmpty()){
+            return@launch
+        }
+
+        if (user.email.isEmpty() || !isValidEmail(user.email)){
+            return@launch
+        }
+
+        if (user.password.isEmpty()){
+            return@launch
+        }
+        userRepository.updateUser(user)
+        GlobalUser.getInstance().setUser(user)
+    }
+
+    fun deleteUser(user: User) = viewModelScope.launch {
+        userRepository.deleteUser(user)
+    }
+
+    fun regUser(user: User) = viewModelScope.launch {
+        val globalUser = userRepository.getUserByLogin(user.login)
+        globalUser?.let {
+            return@launch
+        } ?: run {
+            if(user.password.isEmpty()){
+                return@launch
+            }
+
+            if(user.email.isEmpty() || !isValidEmail(user.email)){
+                return@launch
+            }
+            userRepository.insertUser(user)
+            GlobalUser.getInstance().setUser(userRepository.getUserByLogin(user.login))
+        }
+    }
+
+    fun authUser(user: User) = viewModelScope.launch {
+        val globalUser = userRepository.getUserByLogin(user.login)
+        globalUser?.let {
+            if (user.password.isNotEmpty() && user.password == globalUser.password){
+                GlobalUser.getInstance().setUser(globalUser)
+            }
+        }
+    }
+
+    private fun isValidEmail(email: String): Boolean {
+        return android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches()
+    }
+}

app/src/main/java/com/example/mobileapp/screens/Authorization.kt

@@ -8,7 +8,9 @@ import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.mutableStateListOf
+import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
@@ -17,31 +19,32 @@ import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.unit.dp
+import androidx.lifecycle.viewmodel.compose.viewModel
 import androidx.navigation.NavHostController
 import com.example.mobileapp.R
+import com.example.mobileapp.components.ActiveButton
 import com.example.mobileapp.components.NavigationButton
 import com.example.mobileapp.components.PasswordInputField
 import com.example.mobileapp.components.PlaceholderInputField
 import com.example.mobileapp.database.MobileAppDataBase
 import com.example.mobileapp.database.entities.User
+import com.example.mobileapp.database.viewmodels.MobileAppViewModelProvider
+import com.example.mobileapp.database.viewmodels.UserViewModel
 import com.example.mobileapp.ui.theme.ButtonColor1
 import com.example.mobileapp.ui.theme.ButtonColor2
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 
 @Composable
-fun Authorization(navController: NavHostController){
-    val context = LocalContext.current
-    val users = remember { mutableStateListOf<User>() }
+fun Authorization(navController: NavHostController,
+                  userViewModel: UserViewModel = viewModel(
+                      factory = MobileAppViewModelProvider.Factory
+                  )) {
+    val users = userViewModel.getAllUsers.collectAsState(emptyList()).value
+
+    val login = remember { mutableStateOf("") }
+    val password = remember { mutableStateOf("") }
 
-    LaunchedEffect(Unit) {
-        withContext(Dispatchers.IO) {
-            MobileAppDataBase.getInstance(context).userDao().getAll().collect { data ->
-                users.clear()
-                users.addAll(data)
-            }
-        }
-    }
     Column(
         modifier = Modifier
             .fillMaxSize()
@@ -53,13 +56,28 @@ fun Authorization(navController: NavHostController){
             contentDescription = "login",
             contentScale = ContentScale.Crop,
             modifier = Modifier
-                .size(512.dp)
+                .size(448.dp)
                 .padding(8.dp)
                 .align(Alignment.CenterHorizontally))
-        PlaceholderInputField(label = "Логин", isSingleLine = true, onTextChanged = {})
-        PasswordInputField(label = "Пароль", onPasswordChanged = {})
-        NavigationButton(navController = navController, destination = "main", label = "Вход",
-            backgroundColor = ButtonColor2, textColor = Color.White)
+        PlaceholderInputField(label = "Логин", isSingleLine = true, onTextChanged = {newlogin ->
+            login.value = newlogin
+        })
+        PasswordInputField(label = "Пароль", onPasswordChanged = {newpassword ->
+            password.value = newpassword
+        })
+        ActiveButton(label = "Вход", backgroundColor = ButtonColor2,
+            textColor = Color.White, onClickAction = {
+                if (login.value.isNotEmpty() && password.value.isNotEmpty()) {
+                    userViewModel.authUser(
+                        User(
+                            login = login.value,
+                            password = password.value,
+                            email = String()
+                        )
+                    )
+                    navController.navigate("main")
+                }
+        })
         NavigationButton(navController = navController, destination = "registration", label = "Регистрация",
             backgroundColor = ButtonColor1, textColor = Color.Black)
     }

app/src/main/java/com/example/mobileapp/screens/EditScreens.kt

@@ -9,40 +9,51 @@ import android.provider.MediaStore
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.compose.foundation.Image
+import androidx.compose.foundation.border
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.material3.MaterialTheme
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.runtime.mutableStateListOf
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.asImageBitmap
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.unit.dp
+import androidx.lifecycle.viewmodel.compose.viewModel
 import androidx.navigation.NavHostController
+import com.example.mobileapp.GlobalUser
 import com.example.mobileapp.R
 import com.example.mobileapp.components.ActiveButton
 import com.example.mobileapp.components.NavigationButton
-import com.example.mobileapp.components.PasswordInputField
 import com.example.mobileapp.components.PlaceholderInputField
-import com.example.mobileapp.database.MobileAppDataBase
 import com.example.mobileapp.database.entities.Mail
 import com.example.mobileapp.database.entities.Story
+import com.example.mobileapp.database.entities.User
+import com.example.mobileapp.database.viewmodels.MailViewModel
+import com.example.mobileapp.database.viewmodels.MobileAppViewModelProvider
+import com.example.mobileapp.database.viewmodels.StoryViewModel
+import com.example.mobileapp.database.viewmodels.UserViewModel
 import com.example.mobileapp.ui.theme.ButtonColor1
 import com.example.mobileapp.ui.theme.ButtonColor2
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.withContext
 
 @Composable
-fun EditStoryScreen(navController: NavHostController, storyId: Int? = null) {
+fun EditStoryScreen(navController: NavHostController, storyId: Int? = null,
+                    storyViewModel: StoryViewModel = viewModel(
+                        factory = MobileAppViewModelProvider.Factory
+                    )) {
     val context = LocalContext.current
 
     val cover = remember { mutableStateOf<Bitmap>(BitmapFactory.decodeResource(context.resources, R.drawable.editplaceholder)) }
@@ -58,7 +69,6 @@ fun EditStoryScreen(navController: NavHostController, storyId: Int? = null) {
         if (Build.VERSION.SDK_INT < 28) {
             cover.value = MediaStore.Images
                 .Media.getBitmap(context.contentResolver, imageData.value)
-
         } else {
             val source = ImageDecoder
                 .createSource(context.contentResolver, imageData.value!!)
@@ -66,46 +76,20 @@ fun EditStoryScreen(navController: NavHostController, storyId: Int? = null) {
         }
     }
 
-    storyId?.let{
-        LaunchedEffect(Unit) {
-            withContext(Dispatchers.IO) {
-                val story = MobileAppDataBase.getInstance(context).storyDao().getById(storyId!!)
-                cover.value = story!!.cover
-                title.value = story!!.title
-                description.value = story!!.description
-            }
-        }
-    }
-
-    val edit = remember { mutableStateOf(false) }
-    if (edit.value){
-        LaunchedEffect(Unit) {
-            withContext(Dispatchers.IO) {
-                storyId?.let {
-                    MobileAppDataBase.getInstance(context).storyDao()
-                        .update(
-                            Story(
-                                id = storyId,
-                                title = title.value,
-                                description = description.value,
-                                cover = cover.value,
-                                userId = 1)
-                        )
-
-                } ?: run {
-                    MobileAppDataBase.getInstance(context).storyDao()
-                        .insert(
-                            Story(
-                                title = title.value,
-                                description = description.value,
-                                cover = cover.value,
-                                userId = 1)
-                        )
+    LaunchedEffect(Unit) {
+        storyId?.let {
+            storyViewModel.getStoryById(storyId).collect {
+                if (it != null) {
+                    cover.value = it.cover
+                }
+                if (it != null) {
+                    title.value = it.title
+                }
+                if (it != null) {
+                    description.value = it.description
                 }
             }
         }
-        edit.value = !edit.value
-        navController.navigate("story")
     }
 
     Column(
@@ -134,7 +118,27 @@ fun EditStoryScreen(navController: NavHostController, storyId: Int? = null) {
             description.value = newDescription
         })
         ActiveButton(label = "Сохранить", backgroundColor = ButtonColor1, textColor = Color.Black, onClickAction = {
-            edit.value = !edit.value
+            storyId?.let {
+                storyViewModel.updateStory(
+                    Story(
+                        id = storyId,
+                        cover = cover.value,
+                        title = title.value,
+                        description = description.value,
+                        userId = GlobalUser.getInstance().getUser()?.id!!
+                    )
+                )
+            } ?: run {
+                storyViewModel.insertStory(
+                    Story(
+                        cover = cover.value,
+                        title = title.value,
+                        description = description.value,
+                        userId = GlobalUser.getInstance().getUser()?.id!!
+                    )
+                )
+            }
+            navController.navigate("story")
         })
         NavigationButton(navController = navController, destination = "story", label = "Назад",
             backgroundColor = ButtonColor2, textColor = Color.White)
@@ -142,22 +146,12 @@ fun EditStoryScreen(navController: NavHostController, storyId: Int? = null) {
 }
 
 @Composable
-fun EditMailScreen(navController: NavHostController) {
-    val context = LocalContext.current
-
+fun EditMailScreen(navController: NavHostController,
+                   mailViewModel: MailViewModel = viewModel(
+                       factory = MobileAppViewModelProvider.Factory
+                   )) {
     val message = remember { mutableStateOf("") }
 
-    val create = remember { mutableStateOf(false) }
-    if(create.value){
-        LaunchedEffect(Unit) {
-            withContext(Dispatchers.IO) {
-                MobileAppDataBase.getInstance(context).mailDao()
-                    .insert(Mail(message = message.value, userId = 2))
-            }
-        }
-        create.value = !create.value
-        navController.navigate("mail")
-    }
     Column(
         modifier = Modifier
             .fillMaxSize()
@@ -176,7 +170,13 @@ fun EditMailScreen(navController: NavHostController) {
             message.value = newmessage
         })
         ActiveButton(label = "Сохранить", backgroundColor = ButtonColor1, textColor = Color.Black, onClickAction = {
-            create.value = !create.value
+            mailViewModel.insertMail(
+                Mail(
+                    message = message.value,
+                    userId = GlobalUser.getInstance().getUser()?.id!!
+                )
+            )
+            navController.navigate("mail")
         })
         NavigationButton(navController = navController, destination = "mail", label = "Назад",
             backgroundColor = ButtonColor2, textColor = Color.White)
@@ -184,11 +184,15 @@ fun EditMailScreen(navController: NavHostController) {
 }
 
 @Composable
-fun EditUserScreen(navController: NavHostController){
+fun EditUserScreen(navController: NavHostController,
+                   userViewModel: UserViewModel = viewModel(
+                       factory = MobileAppViewModelProvider.Factory
+                   )) {
     val context = LocalContext.current
 
+    var userId = remember { mutableStateOf(0) }
     val photo = remember { mutableStateOf<Bitmap>(BitmapFactory.decodeResource(context.resources, R.drawable.photoplaceholder)) }
-    val name = remember { mutableStateOf("") }
+    val login = remember { mutableStateOf("") }
     val password = remember { mutableStateOf("") }
     val email = remember { mutableStateOf("") }
 
@@ -201,7 +205,6 @@ fun EditUserScreen(navController: NavHostController){
         if (Build.VERSION.SDK_INT < 28) {
             photo.value = MediaStore.Images
                 .Media.getBitmap(context.contentResolver, imageData.value)
-
         } else {
             val source = ImageDecoder
                 .createSource(context.contentResolver, imageData.value!!)
@@ -209,6 +212,17 @@ fun EditUserScreen(navController: NavHostController){
         }
     }
 
+    LaunchedEffect(Unit) {
+        GlobalUser.getInstance().getUser()?.let { user ->
+            if (user!!.photo != null)
+                photo.value = user!!.photo!!
+            userId.value = user!!.id!!
+            login.value = user!!.login
+            password.value = user!!.password
+            email.value = user!!.email
+        }
+    }
+
     Column(
         modifier = Modifier
             .fillMaxSize()
@@ -220,15 +234,20 @@ fun EditUserScreen(navController: NavHostController){
             contentDescription = "editplaceholder",
             contentScale = ContentScale.Crop,
             modifier = Modifier
-                .size(384.dp)
                 .padding(8.dp)
+                .clip(CircleShape)
+                .size(384.dp)
+                .border(
+                    width = 2.dp,
+                    color = MaterialTheme.colorScheme.onPrimary,
+                )
                 .align(Alignment.CenterHorizontally))
         ActiveButton(label = "Выбрать фото", backgroundColor = ButtonColor1, textColor = Color.Black, onClickAction = {
             launcher.launch("image/*")
         })
         PlaceholderInputField(label = "Никнейм", isSingleLine = true,
-            startValue = name.value, onTextChanged = { newName ->
-                name.value = newName
+            startValue = login.value, onTextChanged = { newLogin ->
+                login.value = newLogin
             })
         PlaceholderInputField(label = "Пароль", isSingleLine = true,
             startValue = password.value, onTextChanged = { newPassword ->
@@ -239,9 +258,20 @@ fun EditUserScreen(navController: NavHostController){
                 email.value = newEmail
             })
         ActiveButton(label = "Сохранить", backgroundColor = ButtonColor1, textColor = Color.Black, onClickAction = {
-            //edit.value = !edit.value
+            userViewModel.updateUser(
+                User(
+                    id = userId.value,
+                    login = login.value,
+                    password = password.value,
+                    email = email.value,
+                    photo = photo.value
+                )
+            )
+            navController.navigate("settings")
+        })
+        ActiveButton(label = "Назад", backgroundColor = ButtonColor2, textColor = Color.White,
+            onClickAction = {
+                navController.navigate("settings")
         })
-        NavigationButton(navController = navController, destination = "story", label = "Назад",
-            backgroundColor = ButtonColor2, textColor = Color.White)
     }
 }

app/src/main/java/com/example/mobileapp/screens/ListDataScreen.kt

@@ -1,48 +0,0 @@
-package com.example.mobileapp.screens
-
-import androidx.compose.foundation.background
-import androidx.compose.foundation.layout.Arrangement
-import androidx.compose.foundation.layout.Box
-import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.fillMaxHeight
-import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.foundation.layout.fillMaxWidth
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.runtime.mutableStateListOf
-import androidx.compose.runtime.remember
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.platform.LocalContext
-import androidx.navigation.NavHostController
-import com.example.mobileapp.components.DataListScroll
-import com.example.mobileapp.components.NavBar
-import com.example.mobileapp.database.MobileAppDataBase
-import com.example.mobileapp.database.entities.Story
-import com.example.mobileapp.ui.theme.BackgroundItem1
-import com.example.mobileapp.ui.theme.BackgroundItem2
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.withContext
-
-@Composable
-fun ListDataScreen(navController: NavHostController){
-
-    val context = LocalContext.current
-    val stories = remember { mutableStateListOf<Story>() }
-
-    LaunchedEffect(Unit) {
-        withContext(Dispatchers.IO) {
-            MobileAppDataBase.getInstance(context).storyDao().getAll().collect { data ->
-                stories.clear()
-                stories.addAll(data)
-            }
-        }
-    }
-
-    Column(
-        modifier = Modifier
-            .fillMaxSize()
-            .background(BackgroundItem1)
-    ) {
-        DataListScroll(navController, stories)
-    }
-}

app/src/main/java/com/example/mobileapp/screens/ListMailScreen.kt

@@ -3,40 +3,61 @@ package com.example.mobileapp.screens
 import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.lazy.grid.GridCells
+import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.mutableStateListOf
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
+import androidx.lifecycle.viewmodel.compose.viewModel
 import androidx.navigation.NavHostController
+import androidx.paging.compose.collectAsLazyPagingItems
+import androidx.paging.compose.itemKey
 import com.example.mobileapp.components.DataListScroll
+import com.example.mobileapp.components.MailListItem
+import com.example.mobileapp.components.StoryListItem
+import com.example.mobileapp.components.addNewListItem
 import com.example.mobileapp.database.MobileAppDataBase
 import com.example.mobileapp.database.entities.Mail
+import com.example.mobileapp.database.entities.Story
+import com.example.mobileapp.database.viewmodels.MailViewModel
+import com.example.mobileapp.database.viewmodels.MobileAppViewModelProvider
 import com.example.mobileapp.ui.theme.BackgroundItem1
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.collect
 import kotlinx.coroutines.withContext
 
 @Composable
-fun ListMailScreen(navController: NavHostController){
-
-    val context = LocalContext.current
-    val mails = remember { mutableStateListOf<Mail>() }
-
-    LaunchedEffect(Unit) {
-        withContext(Dispatchers.IO) {
-            MobileAppDataBase.getInstance(context).mailDao().getAll().collect { data ->
-                mails.clear()
-                mails.addAll(data)
-            }
-        }
-    }
+fun ListMailScreen(navController: NavHostController,
+                   mailViewModel: MailViewModel = viewModel(
+                       factory = MobileAppViewModelProvider.Factory
+                   )) {
+    val mails = mailViewModel.getAllMails.collectAsLazyPagingItems()
 
     Column(
         modifier = Modifier
             .fillMaxSize()
             .background(BackgroundItem1)
     ) {
-        DataListScroll(navController, mails)
+        LazyVerticalGrid(
+            columns = GridCells.Fixed(1)
+        ) {
+            item {
+                addNewListItem(navController, "editmail")
+            }
+            items(
+                count = mails.itemCount,
+                key = mails.itemKey { item -> item.id!! }
+            ) { index: Int ->
+                val mail: Mail? = mails[index]
+                if (mail != null) {
+                    MailListItem(item = mail, navController = navController)
+                }
+            }
+        }
+        //DataListScroll(navController, mails)
     }
 }

app/src/main/java/com/example/mobileapp/screens/ListStoryScreen.kt

@@ -0,0 +1,55 @@
+package com.example.mobileapp.screens
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.grid.GridCells
+import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.lifecycle.viewmodel.compose.viewModel
+import androidx.navigation.NavHostController
+import androidx.paging.compose.collectAsLazyPagingItems
+import androidx.paging.compose.itemKey
+import com.example.mobileapp.GlobalUser
+import com.example.mobileapp.components.DataListScroll
+import com.example.mobileapp.components.StoryListItem
+import com.example.mobileapp.components.addNewListItem
+import com.example.mobileapp.database.entities.Story
+import com.example.mobileapp.database.viewmodels.MobileAppViewModelProvider
+import com.example.mobileapp.database.viewmodels.StoryViewModel
+import com.example.mobileapp.ui.theme.BackgroundItem1
+
+@Composable
+fun ListStoryScreen(navController: NavHostController,
+                    storyViewModel: StoryViewModel = viewModel(
+                        factory = MobileAppViewModelProvider.Factory
+                    )) {
+    val stories = storyViewModel.getStoriesByUserId(GlobalUser.getInstance().getUser()?.id!!).collectAsLazyPagingItems()
+    //val stories = storyViewModel.getAllStories.collectAsLazyPagingItems()
+
+    Column(
+        modifier = Modifier
+            .fillMaxSize()
+            .background(BackgroundItem1)
+    ) {
+        LazyVerticalGrid(
+            columns = GridCells.Fixed(1)
+        ) {
+            item {
+                addNewListItem(navController, "editstory")
+            }
+            items(
+                count = stories.itemCount,
+                key = stories.itemKey { item -> item.id!! }
+            ) { index: Int ->
+                val story: Story? = stories[index]
+                if (story != null) {
+                    StoryListItem(item = story, navController = navController)
+                }
+            }
+        }
+        //DataListScroll(navController, stories)
+    }
+}

app/src/main/java/com/example/mobileapp/screens/MainScreen.kt

@@ -8,8 +8,12 @@ import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.lazy.grid.GridCells
+import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
@@ -18,38 +22,69 @@ import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
+import androidx.lifecycle.viewmodel.compose.viewModel
 import androidx.navigation.NavHostController
+import androidx.paging.compose.collectAsLazyPagingItems
+import androidx.paging.compose.itemKey
 import com.example.mobileapp.R
 import com.example.mobileapp.components.NavBar
 import com.example.mobileapp.components.SearchInputField
+import com.example.mobileapp.components.StoryListItem
+import com.example.mobileapp.components.addNewListItem
+import com.example.mobileapp.database.entities.Story
+import com.example.mobileapp.database.viewmodels.MobileAppViewModelProvider
+import com.example.mobileapp.database.viewmodels.StoryViewModel
 
 @Composable
-fun MainScreen(navController: NavHostController) {
+fun MainScreen(navController: NavHostController,
+               storyViewModel: StoryViewModel = viewModel(
+                   factory = MobileAppViewModelProvider.Factory
+               )) {
+    val stories = storyViewModel.getAllStories.collectAsLazyPagingItems()
+
+    val search = remember { mutableStateOf("") }
+
     Column(
         modifier = Modifier
             .fillMaxSize()
     ) {
-        SearchInputField()
-        Column(
-            modifier = Modifier
-                .fillMaxWidth()
-                .fillMaxHeight(0.89f),
-            verticalArrangement = Arrangement.Center,
-            horizontalAlignment = Alignment.CenterHorizontally
-        ) {
-            Image(
-                painter = painterResource(id = R.drawable.main),
-                contentDescription = "main",
-                contentScale = ContentScale.Crop,
-                modifier = Modifier
-                    .size(512.dp)
-                    .padding(8.dp)
-            )
-            Text(
-                text = "Здесь будут посты авторов",
-                fontSize = 20.sp,
-                fontWeight = FontWeight.Bold
-            )
+        SearchInputField(onTextChanged = {newsearch ->
+            search.value = newsearch
+        })
+        if (stories.itemCount > 0){
+            LazyVerticalGrid(
+                columns = GridCells.Fixed(1)
+            ) {
+                items(
+                    count = stories.itemCount,
+                    key = stories.itemKey { item -> item.id!! }
+                ) { index: Int ->
+                    val story: Story? = stories[index]
+                    if (story != null && (search.value.isEmpty() || story.title.contains(search.value, ignoreCase = true))) {
+                        StoryListItem(item = story, navController = navController, isReadOnly = true)
+                    }
+                }
+            }
+        }
+        else {
+            Column(
+                verticalArrangement = Arrangement.Center,
+                horizontalAlignment = Alignment.CenterHorizontally
+            ) {
+                Image(
+                    painter = painterResource(id = R.drawable.main),
+                    contentDescription = "main",
+                    contentScale = ContentScale.Crop,
+                    modifier = Modifier
+                        .size(512.dp)
+                        .padding(8.dp)
+                )
+                Text(
+                    text = "Здесь будут посты авторов",
+                    fontSize = 20.sp,
+                    fontWeight = FontWeight.Bold
+                )
+            }
         }
     }
 }

app/src/main/java/com/example/mobileapp/screens/Registration.kt

@@ -7,22 +7,37 @@ import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.unit.dp
+import androidx.lifecycle.viewmodel.compose.viewModel
 import androidx.navigation.NavHostController
 import com.example.mobileapp.R
+import com.example.mobileapp.components.ActiveButton
 import com.example.mobileapp.components.NavigationButton
 import com.example.mobileapp.components.PasswordInputField
 import com.example.mobileapp.components.PlaceholderInputField
+import com.example.mobileapp.database.entities.User
+import com.example.mobileapp.database.viewmodels.MobileAppViewModelProvider
+import com.example.mobileapp.database.viewmodels.UserViewModel
 import com.example.mobileapp.ui.theme.ButtonColor1
 import com.example.mobileapp.ui.theme.ButtonColor2
 
 @Composable
-fun Registration(navController: NavHostController){
+fun Registration(navController: NavHostController,
+                 userViewModel: UserViewModel = viewModel(
+                     factory = MobileAppViewModelProvider.Factory
+                 )) {
+    val login = remember { mutableStateOf("") }
+    val email = remember { mutableStateOf("") }
+    val password = remember { mutableStateOf("") }
+    val repeatepassword = remember { mutableStateOf("") }
+
     Column(
         modifier = Modifier
             .fillMaxSize()
@@ -34,15 +49,34 @@ fun Registration(navController: NavHostController){
             contentDescription = "registration",
             contentScale = ContentScale.Crop,
             modifier = Modifier
-                .size(384.dp)
+                .size(320.dp)
                 .padding(8.dp)
                 .align(Alignment.CenterHorizontally))
-        PlaceholderInputField(label = "Логин", isSingleLine = true, onTextChanged = {})
-        PlaceholderInputField(label = "Email", isSingleLine = true, onTextChanged = {})
-        PasswordInputField(label = "Пароль", onPasswordChanged = {})
-        PasswordInputField(label = "Пароль ещё раз", onPasswordChanged = {})
-        NavigationButton(navController = navController, destination = "main",
-            label = "Зарегистрироваться", backgroundColor = ButtonColor2, textColor = Color.White)
+        PlaceholderInputField(label = "Логин", isSingleLine = true, onTextChanged = {newlogin ->
+            login.value = newlogin
+        })
+        PlaceholderInputField(label = "Email", isSingleLine = true, onTextChanged = {newemail ->
+            email.value = newemail
+        })
+        PasswordInputField(label = "Пароль", onPasswordChanged = {newpassword ->
+            password.value = newpassword
+        })
+        PasswordInputField(label = "Пароль ещё раз", onPasswordChanged = {newpassword ->
+            repeatepassword.value = newpassword
+        })
+        ActiveButton(label = "Зарегистрироваться", backgroundColor = ButtonColor2,
+            textColor = Color.White, onClickAction = {
+                if (password.value == repeatepassword.value){
+                    userViewModel.regUser(
+                        User(
+                            login = login.value,
+                            password = password.value,
+                            email = email.value
+                        )
+                    )
+                }
+                navController.navigate("main")
+        })
         NavigationButton(navController = navController, destination = "authorization",
             label = "Назад", backgroundColor = ButtonColor1, textColor = Color.Black)
     }

app/src/main/java/com/example/mobileapp/screens/SettingsScreen.kt

@@ -27,6 +27,7 @@ import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.navigation.NavHostController
+import com.example.mobileapp.GlobalUser
 import com.example.mobileapp.R
 import com.example.mobileapp.components.IconButton
 import com.example.mobileapp.components.NavBar
@@ -46,7 +47,7 @@ fun SettingsScreen(navController: NavHostController){
             contentDescription = "settings",
             contentScale = ContentScale.Crop,
             modifier = Modifier
-                .size(384.dp)
+                .size(320.dp)
                 .padding(8.dp))
         IconButton(iconLeft = Icons.Default.AccountCircle, label = "Учётная запись",
             backgroundColor = ButtonColor2, textColor = Color.White, onClickAction = {
@@ -66,6 +67,7 @@ fun SettingsScreen(navController: NavHostController){
             })
         IconButton(iconLeft = Icons.Default.ExitToApp, label = "Выйти",
             backgroundColor = Color.Red, textColor = Color.White, onClickAction = {
+                GlobalUser.getInstance().setUser(null)
                 navController.navigate("authorization")
             })
     }

app/src/main/java/com/example/mobileapp/screens/ViewScreens.kt

@@ -0,0 +1,168 @@
+package com.example.mobileapp.screens
+
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.border
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.asImageBitmap
+import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import androidx.lifecycle.viewmodel.compose.viewModel
+import androidx.navigation.NavHostController
+import com.example.mobileapp.R
+import com.example.mobileapp.components.NavigationButton
+import com.example.mobileapp.database.viewmodels.MailViewModel
+import com.example.mobileapp.database.viewmodels.MobileAppViewModelProvider
+import com.example.mobileapp.database.viewmodels.StoryViewModel
+import com.example.mobileapp.database.viewmodels.UserViewModel
+import com.example.mobileapp.ui.theme.ButtonColor2
+import java.text.SimpleDateFormat
+import java.util.Date
+
+val dateFormat = SimpleDateFormat("dd.MM.yyyy")
+
+@Composable
+fun StoryViewScreen(navController: NavHostController, storyId: Int,
+                    storyViewModel: StoryViewModel = viewModel(
+                        factory = MobileAppViewModelProvider.Factory
+                    )) {
+    val context = LocalContext.current
+
+    val cover = remember { mutableStateOf<Bitmap>(BitmapFactory.decodeResource(context.resources, R.drawable.editplaceholder)) }
+    val title = remember { mutableStateOf("") }
+    val description = remember { mutableStateOf("") }
+    val postdate = remember { mutableStateOf<Long>(0) }
+
+    val story by storyViewModel.getStoryById(storyId).collectAsState(null)
+    story?.let {
+        cover.value = it.cover
+        title.value = it.title
+        description.value = it.description
+        postdate.value = it.postdate!!
+    }
+
+    Column(
+        modifier = Modifier
+            .fillMaxSize()
+            .padding(bottom = 8.dp),
+        verticalArrangement = Arrangement.Center
+    ) {
+        Image(
+            bitmap = cover.value.asImageBitmap(),
+            contentDescription = "cover",
+            contentScale = ContentScale.Crop,
+            modifier = Modifier
+                .size(512.dp)
+                .padding(8.dp)
+                .align(Alignment.CenterHorizontally))
+        Text(text = "Название: ${title.value}",
+            fontSize = 20.sp,
+            fontWeight = FontWeight.Bold,
+            modifier = Modifier
+                .padding(8.dp))
+        Text(text = "Дата публикации: ${dateFormat.format(Date(postdate.value))}",
+            fontSize = 20.sp,
+            fontWeight = FontWeight.Bold,
+            modifier = Modifier
+                .padding(8.dp))
+        Text(text = "Описание: ${description.value}",
+            fontSize = 20.sp,
+            fontWeight = FontWeight.Bold,
+            modifier = Modifier
+                .padding(8.dp))
+        NavigationButton(navController = navController, destination = "main", label = "Назад",
+            backgroundColor = ButtonColor2, textColor = Color.White)
+    }
+}
+
+@Composable
+fun MailViewScreen(navController: NavHostController, mailId: Int,
+                   mailViewModel: MailViewModel = viewModel(
+                       factory = MobileAppViewModelProvider.Factory
+                   ),
+                   userViewModel: UserViewModel = viewModel(
+                       factory = MobileAppViewModelProvider.Factory
+                   )) {
+    val context = LocalContext.current
+
+    val userName = remember { mutableStateOf("") }
+    val photo = remember { mutableStateOf<Bitmap>(BitmapFactory.decodeResource(context.resources, R.drawable.photoplaceholder)) }
+    val message = remember { mutableStateOf("") }
+    val postdate = remember { mutableStateOf<Long>(0) }
+
+    LaunchedEffect(Unit){
+        mailViewModel.getMail(mailId).collect{
+            if (it != null) {
+                message.value = it.message
+                postdate.value = it.postdate!!
+                userViewModel.getUser(it.userId).collect {user ->
+                    if (user != null) {
+                        if(user.photo != null) {
+                            photo.value = user.photo
+                        }
+                        userName.value = user.email
+                    }
+                }
+            }
+        }
+    }
+
+    Column(
+        modifier = Modifier
+            .fillMaxSize()
+            .padding(bottom = 8.dp),
+        verticalArrangement = Arrangement.Center
+    ) {
+        Image(
+            bitmap = photo.value.asImageBitmap(),
+            contentDescription = "editplaceholder",
+            contentScale = ContentScale.Crop,
+            modifier = Modifier
+                .padding(8.dp)
+                .clip(CircleShape)
+                .size(384.dp)
+                .border(
+                    width = 2.dp,
+                    color = MaterialTheme.colorScheme.onPrimary,
+                )
+                .align(Alignment.CenterHorizontally))
+        Text(text = "Автор: ${userName.value}",
+            fontSize = 20.sp,
+            fontWeight = FontWeight.Bold,
+            modifier = Modifier
+                .padding(8.dp))
+        Text(text = "Дата публикации: ${dateFormat.format(Date(postdate.value))}",
+            fontSize = 20.sp,
+            fontWeight = FontWeight.Bold,
+            modifier = Modifier
+                .padding(8.dp))
+        Text(text = "Текст: ${message.value}",
+            fontSize = 20.sp,
+            fontWeight = FontWeight.Bold,
+            modifier = Modifier
+                .padding(8.dp))
+        NavigationButton(navController = navController, destination = "mail", label = "Назад",
+            backgroundColor = ButtonColor2, textColor = Color.White)
+    }
+}