Created Photos logic and displaying,

also realised saving in cash and getting from cash

.idea/deploymentTargetSelector.xml

@@ -4,6 +4,14 @@
     <selectionStates>
       <SelectionState runConfigName="app">
         <option name="selectionMode" value="DROPDOWN" />
+        <DropdownSelection timestamp="2025-03-15T17:40:38.891328100Z">
+          <Target type="DEFAULT_BOOT">
+            <handle>
+              <DeviceId pluginId="LocalEmulator" identifier="path=C:\Users\Notnik_kg\.android\avd\Pixel_4_XL_API_30_1.avd" />
+            </handle>
+          </Target>
+        </DropdownSelection>
+        <DialogSelection />
       </SelectionState>
     </selectionStates>
   </component>

app/src/main/AndroidManifest.xml

@@ -6,6 +6,7 @@
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
 
     <application
+        android:name=".App"
         android:allowBackup="true"
         android:dataExtractionRules="@xml/data_extraction_rules"
         android:fullBackupContent="@xml/backup_rules"
@@ -13,7 +14,7 @@
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
-        android:theme="@style/Theme.GalleryKotlin"
+        android:theme="@style/Theme.Gallery"
         tools:targetApi="31">
         <activity
             android:name=".MainActivity"

app/src/main/java/com/example/gallery/App.kt

@@ -0,0 +1,15 @@
+package com.example.gallery
+
+import android.app.Application
+
+class App : Application() {
+    companion object {
+        lateinit var instance: App
+            private set
+    }
+
+    override fun onCreate() {
+        super.onCreate()
+        instance = this
+    }
+}

app/src/main/java/com/example/gallery/repository/GalleryRepository.kt

@@ -7,22 +7,35 @@ import kotlinx.coroutines.withContext
 
 class GalleryRepository {
     private val apiService = RetrofitClient.apiService
+    private val photoCache = PhotoCache()
 
     suspend fun getAlbums(): Result<List<Album>> = withContext(Dispatchers.IO) {
         try {
             val response = apiService.getAlbums()
+            photoCache.saveAlbums(response)
             Result.success(response)
         } catch (e: Exception) {
+            val cachedAlbums = photoCache.getAlbums()
+            if (cachedAlbums != null) {
+                Result.success(cachedAlbums)
+            } else {
                 Result.failure(e)
             }
         }
+    }
 
     suspend fun getAlbumDetails(albumId: Int): Result<Album> = withContext(Dispatchers.IO) {
         try {
             val response = apiService.getAlbumDetails(albumId)
+            photoCache.saveAlbumDetails(response)
             Result.success(response)
         } catch (e: Exception) {
+            val cachedAlbum = photoCache.getAlbumDetails(albumId)
+            if (cachedAlbum != null) {
+                Result.success(cachedAlbum)
+            } else {
                 Result.failure(e)
             }
         }
     }
+}

app/src/main/java/com/example/gallery/repository/PhotoCache.kt

@@ -0,0 +1,45 @@
+package com.example.gallery.repository
+
+import android.content.Context
+import com.example.gallery.App
+import com.example.gallery.models.Album
+import com.google.gson.Gson
+import com.google.gson.reflect.TypeToken
+
+class PhotoCache {
+    companion object {
+        private const val ALBUMS_CACHE_KEY = "albums_cache"
+        private const val ALBUM_DETAILS_CACHE_KEY = "album_details_cache_"
+    }
+
+    private val sharedPreferences = App.instance.getSharedPreferences("photo_cache", Context.MODE_PRIVATE)
+
+    fun saveAlbums(albums: List<Album>) {
+        val json = Gson().toJson(albums)
+        sharedPreferences.edit().putString(ALBUMS_CACHE_KEY, json).apply()
+    }
+
+    fun getAlbums(): List<Album>? {
+        val json = sharedPreferences.getString(ALBUMS_CACHE_KEY, null) ?: return null
+        val type = object : TypeToken<List<Album>>() {}.type
+        return try {
+            Gson().fromJson(json, type)
+        } catch (e: Exception) {
+            null
+        }
+    }
+
+    fun saveAlbumDetails(album: Album) {
+        val json = Gson().toJson(album)
+        sharedPreferences.edit().putString(ALBUM_DETAILS_CACHE_KEY + album.id, json).apply()
+    }
+
+    fun getAlbumDetails(albumId: Int): Album? {
+        val json = sharedPreferences.getString(ALBUM_DETAILS_CACHE_KEY + albumId, null) ?: return null
+        return try {
+            Gson().fromJson(json, Album::class.java)
+        } catch (e: Exception) {
+            null
+        }
+    }
+}

app/src/main/java/com/example/gallery/ui/albums/AlbumsFragment.kt

@@ -80,6 +80,12 @@ class AlbumsFragment : Fragment() {
                     .show()
             }
         }
+
+        viewModel.isFromCache.observe(viewLifecycleOwner) { isFromCache ->
+            if (isFromCache) {
+                Snackbar.make(binding.root, "Данные загружены из кэша. Нет подключения к интернету.", Snackbar.LENGTH_LONG).show()
+            }
+        }
     }
 
     override fun onDestroyView() {

app/src/main/java/com/example/gallery/ui/albums/AlbumsViewModel.kt

@@ -1,9 +1,13 @@
 package com.example.gallery.ui.albums
 
+import android.content.Context
+import android.net.ConnectivityManager
+import android.net.NetworkCapabilities
 import androidx.lifecycle.LiveData
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
+import com.example.gallery.App
 import com.example.gallery.models.Album
 import com.example.gallery.repository.GalleryRepository
 import kotlinx.coroutines.launch
@@ -20,6 +24,9 @@ class AlbumsViewModel : ViewModel() {
     private val _error = MutableLiveData<String?>()
     val error: LiveData<String?> = _error
 
+    private val _isFromCache = MutableLiveData<Boolean>()
+    val isFromCache: LiveData<Boolean> = _isFromCache
+
     init {
         loadAlbums()
     }
@@ -28,11 +35,16 @@ class AlbumsViewModel : ViewModel() {
         viewModelScope.launch {
             _isLoading.value = true
             _error.value = null
+            _isFromCache.value = false
 
             repository.getAlbums().fold(
                 onSuccess = { albumsList ->
                     _albums.value = albumsList
                     _isLoading.value = false
+
+                    if (albumsList.isNotEmpty() && !isInternetAvailable()) {
+                        _isFromCache.value = true
+                    }
                 },
                 onFailure = { e ->
                     _error.value = e.message ?: "Неизвестная ошибка"
@@ -45,4 +57,11 @@ class AlbumsViewModel : ViewModel() {
     fun refreshAlbums() {
         loadAlbums()
     }
+
+    private fun isInternetAvailable(): Boolean {
+        val connectivityManager = App.instance.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
+        val network = connectivityManager.activeNetwork ?: return false
+        val networkCapabilities = connectivityManager.getNetworkCapabilities(network) ?: return false
+        return networkCapabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
+    }
 }

app/src/main/java/com/example/gallery/ui/photos/PhotoAdapter.kt

@@ -0,0 +1,56 @@
+package com.example.gallery.ui.photos
+
+import android.view.LayoutInflater
+import android.view.ViewGroup
+import androidx.recyclerview.widget.DiffUtil
+import androidx.recyclerview.widget.ListAdapter
+import androidx.recyclerview.widget.RecyclerView
+import com.example.gallery.databinding.ItemPhotoBinding
+import com.example.gallery.models.Photo
+import com.example.gallery.ui.ImageLoader
+
+class PhotoAdapter(private val onPhotoClick: (Photo) -> Unit) :
+    ListAdapter<Photo, PhotoAdapter.PhotoViewHolder>(PhotoDiffCallback()) {
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): PhotoViewHolder {
+        val binding = ItemPhotoBinding.inflate(
+            LayoutInflater.from(parent.context),
+            parent,
+            false
+        )
+        return PhotoViewHolder(binding)
+    }
+
+    override fun onBindViewHolder(holder: PhotoViewHolder, position: Int) {
+        holder.bind(getItem(position))
+    }
+
+    inner class PhotoViewHolder(private val binding: ItemPhotoBinding) :
+        RecyclerView.ViewHolder(binding.root) {
+
+        init {
+            binding.root.setOnClickListener {
+                val position = bindingAdapterPosition
+                if (position != RecyclerView.NO_POSITION) {
+                    onPhotoClick(getItem(position))
+                }
+            }
+        }
+
+        fun bind(photo: Photo) {
+            binding.photoTitle.text = photo.title
+            binding.photoDescription.text = photo.description
+            ImageLoader.loadImage(binding.photoImage, photo.imageUrl)
+        }
+    }
+
+    private class PhotoDiffCallback : DiffUtil.ItemCallback<Photo>() {
+        override fun areItemsTheSame(oldItem: Photo, newItem: Photo): Boolean {
+            return oldItem.id == newItem.id
+        }
+
+        override fun areContentsTheSame(oldItem: Photo, newItem: Photo): Boolean {
+            return oldItem == newItem
+        }
+    }
+}

app/src/main/java/com/example/gallery/ui/photos/PhotoDetailFragment.kt

@@ -0,0 +1,45 @@
+package com.example.gallery.ui.photos
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import androidx.navigation.fragment.navArgs
+import com.example.gallery.databinding.FragmentPhotoDetailBinding
+import com.example.gallery.ui.ImageLoader
+
+class PhotoDetailFragment : Fragment() {
+    private var _binding: FragmentPhotoDetailBinding? = null
+    private val binding get() = _binding!!
+
+    private val args: PhotoDetailFragmentArgs by navArgs()
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View {
+        _binding = FragmentPhotoDetailBinding.inflate(inflater, container, false)
+        return binding.root
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        val photo = args.photo
+
+        binding.apply {
+            photoTitle.text = photo.title
+            photoDescription.text = photo.description
+            ImageLoader.loadImage(photoImage, photo.imageUrl)
+        }
+
+        requireActivity().title = photo.title
+    }
+
+    override fun onDestroyView() {
+        super.onDestroyView()
+        _binding = null
+    }
+}

app/src/main/java/com/example/gallery/ui/photos/PhotosFragment.kt

@@ -0,0 +1,104 @@
+package com.example.gallery.ui.photos
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.core.view.isVisible
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.viewModels
+import androidx.navigation.fragment.findNavController
+import androidx.navigation.fragment.navArgs
+import androidx.recyclerview.widget.StaggeredGridLayoutManager
+import com.example.gallery.databinding.FragmentPhotosBinding
+import com.google.android.material.snackbar.Snackbar
+
+class PhotosFragment : Fragment() {
+    private var _binding: FragmentPhotosBinding? = null
+    private val binding get() = _binding!!
+
+    private val viewModel: PhotosViewModel by viewModels()
+    private lateinit var photoAdapter: PhotoAdapter
+    private val args: PhotosFragmentArgs by navArgs()
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View {
+        _binding = FragmentPhotosBinding.inflate(inflater, container, false)
+        return binding.root
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        setupRecyclerView()
+        setupSwipeRefresh()
+        observeViewModel()
+
+        viewModel.loadPhotos(args.album)
+    }
+
+    private fun setupRecyclerView() {
+        photoAdapter = PhotoAdapter { photo ->
+            val action = PhotosFragmentDirections.actionPhotosFragmentToPhotoDetailFragment(photo)
+            findNavController().navigate(action)
+        }
+
+        binding.recyclerView.apply {
+            adapter = photoAdapter
+            layoutManager = StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL)
+            setHasFixedSize(true)
+        }
+    }
+
+    private fun setupSwipeRefresh() {
+        binding.swipeRefreshLayout.setOnRefreshListener {
+            viewModel.refreshPhotos(args.album.id)
+        }
+    }
+
+    private fun observeViewModel() {
+        viewModel.photos.observe(viewLifecycleOwner) { photos ->
+            photoAdapter.submitList(photos)
+            binding.emptyView.isVisible = photos.isEmpty()
+        }
+
+        viewModel.isLoading.observe(viewLifecycleOwner) { isLoading ->
+            binding.swipeRefreshLayout.isRefreshing = isLoading
+            binding.shimmerLayout.isVisible = isLoading && photoAdapter.itemCount == 0
+
+            if (isLoading) {
+                binding.shimmerLayout.startShimmer()
+            } else {
+                binding.shimmerLayout.stopShimmer()
+            }
+        }
+
+        viewModel.error.observe(viewLifecycleOwner) { errorMessage ->
+            if (!errorMessage.isNullOrEmpty()) {
+                Snackbar.make(binding.root, errorMessage, Snackbar.LENGTH_LONG)
+                    .setAction("Повторить") {
+                        viewModel.refreshPhotos(args.album.id)
+                    }
+                    .show()
+            }
+        }
+
+        viewModel.isFromCache.observe(viewLifecycleOwner) { isFromCache ->
+            if (isFromCache) {
+                Snackbar.make(binding.root, "Данные загружены из кэша. Нет подключения к интернету.", Snackbar.LENGTH_LONG).show()
+            }
+        }
+
+        viewModel.albumTitle.observe(viewLifecycleOwner) { title ->
+            requireActivity().title = title
+        }
+    }
+
+    override fun onDestroyView() {
+        super.onDestroyView()
+        _binding = null
+    }
+}

app/src/main/java/com/example/gallery/ui/photos/PhotosViewModel.kt

@@ -0,0 +1,94 @@
+package com.example.gallery.ui.photos
+
+import android.content.Context
+import android.net.ConnectivityManager
+import android.net.NetworkCapabilities
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import com.example.gallery.App
+import com.example.gallery.models.Album
+import com.example.gallery.models.Photo
+import com.example.gallery.repository.GalleryRepository
+import kotlinx.coroutines.launch
+
+class PhotosViewModel : ViewModel() {
+    private val repository = GalleryRepository()
+
+    private val _photos = MutableLiveData<List<Photo>>()
+    val photos: LiveData<List<Photo>> = _photos
+
+    private val _isLoading = MutableLiveData<Boolean>()
+    val isLoading: LiveData<Boolean> = _isLoading
+
+    private val _error = MutableLiveData<String?>()
+    val error: LiveData<String?> = _error
+
+    private val _albumTitle = MutableLiveData<String>()
+    val albumTitle: LiveData<String> = _albumTitle
+
+    private val _isFromCache = MutableLiveData<Boolean>()
+    val isFromCache: LiveData<Boolean> = _isFromCache
+
+    fun loadPhotos(album: Album) {
+        _albumTitle.value = album.title
+        _isFromCache.value = false
+
+        album.photos?.let {
+            _photos.value = it
+            return
+        }
+
+        viewModelScope.launch {
+            _isLoading.value = true
+            _error.value = null
+
+            repository.getAlbumDetails(album.id).fold(
+                onSuccess = { albumDetails ->
+                    _photos.value = albumDetails.photos ?: emptyList()
+                    _isLoading.value = false
+
+                    if ((albumDetails.photos?.isNotEmpty() == true) && !isInternetAvailable()) {
+                        _isFromCache.value = true
+                    }
+                },
+                onFailure = { e ->
+                    _error.value = e.message ?: "Неизвестная ошибка"
+                    _isLoading.value = false
+                }
+            )
+        }
+    }
+
+    fun refreshPhotos(albumId: Int) {
+        viewModelScope.launch {
+            _isLoading.value = true
+            _error.value = null
+            _isFromCache.value = false
+
+            repository.getAlbumDetails(albumId).fold(
+                onSuccess = { albumDetails ->
+                    _photos.value = albumDetails.photos ?: emptyList()
+                    _isLoading.value = false
+
+                    if ((albumDetails.photos?.isNotEmpty() == true) && !isInternetAvailable()) {
+                        _isFromCache.value = true
+                    }
+                },
+                onFailure = { e ->
+                    _error.value = e.message ?: "Неизвестная ошибка"
+                    _isLoading.value = false
+                }
+            )
+        }
+    }
+
+    // Проверка доступности интернета
+    private fun isInternetAvailable(): Boolean {
+        val connectivityManager = App.instance.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
+        val network = connectivityManager.activeNetwork ?: return false
+        val networkCapabilities = connectivityManager.getNetworkCapabilities(network) ?: return false
+        return networkCapabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
+    }
+}

app/src/main/res/drawable/ic_gallery_logo.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="120dp"
+    android:height="120dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M22,16L22,4c0,-1.1 -0.9,-2 -2,-2L8,2c-1.1,0 -2,0.9 -2,2v12c0,1.1 0.9,2 2,2h12c1.1,0 2,-0.9 2,-2zM11,12l2.03,2.71L16,11l4,5L8,16l3,-4zM2,6v14c0,1.1 0.9,2 2,2h14v-2L4,20L4,6L2,6z" />
+</vector>

app/src/main/res/drawable/ic_launcher_background.xml

@@ -1,170 +1,74 @@
 <?xml version="1.0" encoding="utf-8"?>
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
+<vector
-    android:width="108dp"
     android:height="108dp"
+    android:width="108dp"
+    android:viewportHeight="108"
     android:viewportWidth="108"
-    android:viewportHeight="108">
+    xmlns:android="http://schemas.android.com/apk/res/android">
-    <path
+    <path android:fillColor="#3DDC84"
-        android:fillColor="#3DDC84"
           android:pathData="M0,0h108v108h-108z"/>
-    <path
+    <path android:fillColor="#00000000" android:pathData="M9,0L9,108"
-        android:fillColor="#00000000"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-        android:pathData="M9,0L9,108"
+    <path android:fillColor="#00000000" android:pathData="M19,0L19,108"
-        android:strokeWidth="0.8"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-        android:strokeColor="#33FFFFFF" />
+    <path android:fillColor="#00000000" android:pathData="M29,0L29,108"
-    <path
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-        android:fillColor="#00000000"
+    <path android:fillColor="#00000000" android:pathData="M39,0L39,108"
-        android:pathData="M19,0L19,108"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-        android:strokeWidth="0.8"
+    <path android:fillColor="#00000000" android:pathData="M49,0L49,108"
-        android:strokeColor="#33FFFFFF" />
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-    <path
+    <path android:fillColor="#00000000" android:pathData="M59,0L59,108"
-        android:fillColor="#00000000"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-        android:pathData="M29,0L29,108"
+    <path android:fillColor="#00000000" android:pathData="M69,0L69,108"
-        android:strokeWidth="0.8"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-        android:strokeColor="#33FFFFFF" />
+    <path android:fillColor="#00000000" android:pathData="M79,0L79,108"
-    <path
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-        android:fillColor="#00000000"
+    <path android:fillColor="#00000000" android:pathData="M89,0L89,108"
-        android:pathData="M39,0L39,108"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-        android:strokeWidth="0.8"
+    <path android:fillColor="#00000000" android:pathData="M99,0L99,108"
-        android:strokeColor="#33FFFFFF" />
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-    <path
+    <path android:fillColor="#00000000" android:pathData="M0,9L108,9"
-        android:fillColor="#00000000"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-        android:pathData="M49,0L49,108"
+    <path android:fillColor="#00000000" android:pathData="M0,19L108,19"
-        android:strokeWidth="0.8"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-        android:strokeColor="#33FFFFFF" />
+    <path android:fillColor="#00000000" android:pathData="M0,29L108,29"
-    <path
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-        android:fillColor="#00000000"
+    <path android:fillColor="#00000000" android:pathData="M0,39L108,39"
-        android:pathData="M59,0L59,108"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-        android:strokeWidth="0.8"
+    <path android:fillColor="#00000000" android:pathData="M0,49L108,49"
-        android:strokeColor="#33FFFFFF" />
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-    <path
+    <path android:fillColor="#00000000" android:pathData="M0,59L108,59"
-        android:fillColor="#00000000"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-        android:pathData="M69,0L69,108"
+    <path android:fillColor="#00000000" android:pathData="M0,69L108,69"
-        android:strokeWidth="0.8"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-        android:strokeColor="#33FFFFFF" />
+    <path android:fillColor="#00000000" android:pathData="M0,79L108,79"
-    <path
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-        android:fillColor="#00000000"
+    <path android:fillColor="#00000000" android:pathData="M0,89L108,89"
-        android:pathData="M79,0L79,108"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-        android:strokeWidth="0.8"
+    <path android:fillColor="#00000000" android:pathData="M0,99L108,99"
-        android:strokeColor="#33FFFFFF" />
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-    <path
+    <path android:fillColor="#00000000" android:pathData="M19,29L89,29"
-        android:fillColor="#00000000"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-        android:pathData="M89,0L89,108"
+    <path android:fillColor="#00000000" android:pathData="M19,39L89,39"
-        android:strokeWidth="0.8"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-        android:strokeColor="#33FFFFFF" />
+    <path android:fillColor="#00000000" android:pathData="M19,49L89,49"
-    <path
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-        android:fillColor="#00000000"
+    <path android:fillColor="#00000000" android:pathData="M19,59L89,59"
-        android:pathData="M99,0L99,108"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-        android:strokeWidth="0.8"
+    <path android:fillColor="#00000000" android:pathData="M19,69L89,69"
-        android:strokeColor="#33FFFFFF" />
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-    <path
+    <path android:fillColor="#00000000" android:pathData="M19,79L89,79"
-        android:fillColor="#00000000"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-        android:pathData="M0,9L108,9"
+    <path android:fillColor="#00000000" android:pathData="M29,19L29,89"
-        android:strokeWidth="0.8"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-        android:strokeColor="#33FFFFFF" />
+    <path android:fillColor="#00000000" android:pathData="M39,19L39,89"
-    <path
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-        android:fillColor="#00000000"
+    <path android:fillColor="#00000000" android:pathData="M49,19L49,89"
-        android:pathData="M0,19L108,19"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-        android:strokeWidth="0.8"
+    <path android:fillColor="#00000000" android:pathData="M59,19L59,89"
-        android:strokeColor="#33FFFFFF" />
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-    <path
+    <path android:fillColor="#00000000" android:pathData="M69,19L69,89"
-        android:fillColor="#00000000"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-        android:pathData="M0,29L108,29"
+    <path android:fillColor="#00000000" android:pathData="M79,19L79,89"
-        android:strokeWidth="0.8"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,39L108,39"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,49L108,49"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,59L108,59"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,69L108,69"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,79L108,79"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,89L108,89"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,99L108,99"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M19,29L89,29"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M19,39L89,39"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M19,49L89,49"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M19,59L89,59"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M19,69L89,69"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M19,79L89,79"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M29,19L29,89"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M39,19L39,89"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M49,19L49,89"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M59,19L59,89"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M69,19L69,89"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M79,19L79,89"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
 </vector>

app/src/main/res/drawable/splash_background.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@color/colorPrimary" />
+    <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@drawable/ic_gallery_logo" />
+    </item>
+</layer-list>

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

@@ -0,0 +1,69 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.core.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:fillViewport="true"
+    tools:context=".ui.photo_detail.PhotoDetailFragment">
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content">
+
+        <com.google.android.material.card.MaterialCardView
+            android:id="@+id/imageCard"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_margin="16dp"
+            app:cardCornerRadius="12dp"
+            app:cardElevation="8dp"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent">
+
+            <ImageView
+                android:id="@+id/photoImage"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:adjustViewBounds="true"
+                android:contentDescription="Полное фото"
+                android:scaleType="fitCenter"
+                tools:src="@tools:sample/backgrounds/scenic" />
+
+        </com.google.android.material.card.MaterialCardView>
+
+        <TextView
+            android:id="@+id/photoTitle"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="16dp"
+            android:layout_marginTop="16dp"
+            android:layout_marginEnd="16dp"
+            android:textColor="?android:attr/textColorPrimary"
+            android:textSize="24sp"
+            android:textStyle="bold"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/imageCard"
+            tools:text="Название фотографии" />
+
+        <TextView
+            android:id="@+id/photoDescription"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="16dp"
+            android:layout_marginTop="8dp"
+            android:layout_marginEnd="16dp"
+            android:layout_marginBottom="16dp"
+            android:textColor="?android:attr/textColorSecondary"
+            android:textSize="16sp"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/photoTitle"
+            app:layout_constraintVertical_bias="0.0"
+            tools:text="Подробное описание фотографии. Это может быть длинный текст с информацией о фотографии, месте, где она была сделана, и другими интересными деталями." />
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+</androidx.core.widget.NestedScrollView>

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

@@ -0,0 +1,61 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".ui.photos.PhotosFragment">
+
+    <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
+        android:id="@+id/swipeRefreshLayout"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+        <androidx.recyclerview.widget.RecyclerView
+            android:id="@+id/recyclerView"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:clipToPadding="false"
+            android:padding="8dp"
+            app:layoutManager="androidx.recyclerview.widget.StaggeredGridLayoutManager"
+            app:spanCount="2"
+            tools:itemCount="6"
+            tools:listitem="@layout/item_photo" />
+
+    </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
+
+    <com.facebook.shimmer.ShimmerFrameLayout
+        android:id="@+id/shimmerLayout"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:visibility="gone">
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="vertical">
+
+            <include layout="@layout/shimmer_photo_item" />
+            <include layout="@layout/shimmer_photo_item" />
+            <include layout="@layout/shimmer_photo_item" />
+            <include layout="@layout/shimmer_photo_item" />
+
+        </LinearLayout>
+
+    </com.facebook.shimmer.ShimmerFrameLayout>
+
+    <TextView
+        android:id="@+id/emptyView"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="16dp"
+        android:layout_marginEnd="16dp"
+        android:text="В этом альбоме нет фотографий"
+        android:textSize="18sp"
+        android:visibility="gone"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -0,0 +1,63 @@
+<?xml version="1.0" encoding="utf-8"?>
+<com.google.android.material.card.MaterialCardView xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:layout_margin="8dp"
+    app:cardCornerRadius="8dp"
+    app:cardElevation="4dp">
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content">
+
+        <ImageView
+            android:id="@+id/photoImage"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:contentDescription="Фотография"
+            android:scaleType="centerCrop"
+            app:layout_constraintDimensionRatio="1:1"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent"
+            tools:src="@tools:sample/backgrounds/scenic" />
+
+        <TextView
+            android:id="@+id/photoTitle"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="16dp"
+            android:layout_marginTop="12dp"
+            android:layout_marginEnd="16dp"
+            android:ellipsize="end"
+            android:maxLines="1"
+            android:textColor="?android:attr/textColorPrimary"
+            android:textSize="16sp"
+            android:textStyle="bold"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/photoImage"
+            tools:text="Название фото" />
+
+        <TextView
+            android:id="@+id/photoDescription"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="16dp"
+            android:layout_marginTop="4dp"
+            android:layout_marginEnd="16dp"
+            android:layout_marginBottom="12dp"
+            android:ellipsize="end"
+            android:maxLines="2"
+            android:textColor="?android:attr/textColorSecondary"
+            android:textSize="14sp"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/photoTitle"
+            tools:text="Описание фотографии" />
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+</com.google.android.material.card.MaterialCardView>

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

@@ -0,0 +1,51 @@
+<?xml version="1.0" encoding="utf-8"?>
+<com.google.android.material.card.MaterialCardView xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:layout_margin="8dp"
+    app:cardCornerRadius="8dp"
+    app:cardElevation="4dp">
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content">
+
+        <View
+            android:id="@+id/shimmerImage"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:background="#DDDDDD"
+            app:layout_constraintDimensionRatio="1:1"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent" />
+
+        <View
+            android:id="@+id/shimmerTitle"
+            android:layout_width="0dp"
+            android:layout_height="16dp"
+            android:layout_marginStart="16dp"
+            android:layout_marginTop="12dp"
+            android:layout_marginEnd="16dp"
+            android:background="#BBBBBB"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/shimmerImage" />
+
+        <View
+            android:id="@+id/shimmerDescription"
+            android:layout_width="0dp"
+            android:layout_height="14dp"
+            android:layout_marginStart="16dp"
+            android:layout_marginTop="8dp"
+            android:layout_marginEnd="16dp"
+            android:layout_marginBottom="12dp"
+            android:background="#DDDDDD"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/shimmerTitle" />
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+</com.google.android.material.card.MaterialCardView>

app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background"/>
-    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+    <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
-    <monochrome android:drawable="@drawable/ic_launcher_foreground" />
 </adaptive-icon>

app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background"/>
-    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+    <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
-    <monochrome android:drawable="@drawable/ic_launcher_foreground" />
 </adaptive-icon>

app/src/main/res/navigation/nav_graph.xml

@@ -22,7 +22,7 @@
         tools:layout="@layout/fragment_photos">
         <argument
             android:name="album"
-            app:argType="com.example.gallery.data.model.Album" />
+            app:argType="com.example.gallery.models.Album" />
         <action
             android:id="@+id/action_photosFragment_to_photoDetailFragment"
             app:destination="@id/photoDetailFragment" />
@@ -30,11 +30,11 @@
 
     <fragment
         android:id="@+id/photoDetailFragment"
-        android:name="com.example.gallery.ui.photo_detail.PhotoDetailFragment"
+        android:name="com.example.gallery.ui.photos.PhotoDetailFragment"
         android:label="Просмотр фото"
         tools:layout="@layout/fragment_photo_detail">
         <argument
             android:name="photo"
-            app:argType="com.example.gallery.data.model.Photo" />
+            app:argType="com.example.gallery.models.Photo" />
     </fragment>
 </navigation>

app/src/main/res/values-night/themes.xml

@@ -1,7 +1,13 @@
-<resources xmlns:tools="http://schemas.android.com/tools">
+<?xml version="1.0" encoding="utf-8"?>
-    <!-- Base application theme. -->
+<resources>
-    <style name="Base.Theme.GalleryKotlin" parent="Theme.Material3.DayNight.NoActionBar">
+    <style name="Theme.Gallery" parent="Theme.MaterialComponents.DayNight.NoActionBar">
-        <!-- Customize your dark theme here. -->
+        <item name="colorPrimary">@color/colorPrimary</item>
-        <!-- <item name="colorPrimary">@color/my_dark_primary</item> -->
+        <item name="colorPrimaryDark">@color/black</item>
+        <item name="colorAccent">@color/colorAccent</item>
+        <item name="android:statusBarColor">@color/black</item>
+        <item name="android:colorBackground">#121212</item>
+        <item name="android:textColorPrimary">@color/white</item>
+        <item name="android:textColorSecondary">#B3FFFFFF</item>
+        <item name="android:windowActivityTransitions">true</item>
     </style>
 </resources>

app/src/main/res/values/colors.xml

@@ -1,5 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <color name="black">#FF000000</color>
+    <color name="colorPrimary">#3F51B5</color>
-    <color name="white">#FFFFFFFF</color>
+    <color name="colorPrimaryDark">#303F9F</color>
+    <color name="colorAccent">#FF4081</color>
+
+    <color name="white">#FFFFFF</color>
+    <color name="black">#000000</color>
+    <color name="lightGray">#F5F5F5</color>
 </resources>

app/src/main/res/values/themes.xml

@@ -1,9 +1,17 @@
-<resources xmlns:tools="http://schemas.android.com/tools">
+<?xml version="1.0" encoding="utf-8"?>
-    <!-- Base application theme. -->
+<resources>
-    <style name="Base.Theme.GalleryKotlin" parent="Theme.Material3.DayNight.NoActionBar">
+    <style name="Theme.Gallery" parent="Theme.MaterialComponents.DayNight.NoActionBar">
-        <!-- Customize your light theme here. -->
+        <item name="colorPrimary">@color/colorPrimary</item>
-        <!-- <item name="colorPrimary">@color/my_light_primary</item> -->
+        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
+        <item name="colorAccent">@color/colorAccent</item>
+        <item name="android:statusBarColor">@color/colorPrimaryDark</item>
+        <item name="android:colorBackground">@color/lightGray</item>
+        <item name="android:textColorPrimary">@color/black</item>
+        <item name="android:textColorSecondary">#616161</item>
+        <item name="android:windowActivityTransitions">true</item>
     </style>
 
-    <style name="Theme.GalleryKotlin" parent="Base.Theme.GalleryKotlin" />
+    <style name="SplashTheme" parent="Theme.Gallery">
+        <item name="android:windowBackground">@drawable/splash_background</item>
+    </style>
 </resources>