ДЗ RecyclerView #2

app/src/main/java/otus/gpb/recyclerview/Chat.kt

@@ -0,0 +1,10 @@
+package otus.gpb.recyclerview
+
+data class Chat(
+    val id: Int,
+    val title: String,
+    val author: String,
+    val message: String,
+    val time: String,
+    val icon: Int
+)

app/src/main/java/otus/gpb/recyclerview/DataSource.kt

@@ -0,0 +1,88 @@
+package otus.gpb.recyclerview
+
+class DataSource {
+    private val messagesList = listOf(
+        Chat(
+            id = 1,
+            title = "Title1",
+            author = "User1",
+            message = "Message1",
+            time = "12:00",
+            icon = R.drawable.cat
+        ),
+        Chat(
+            id = 2,
+            title = "Title2",
+            author = "User2",
+            message = "Message2",
+            time = "13:05",
+            icon = R.drawable.dog
+        ),
+        Chat(
+            id = 3,
+            title = "Title3",
+            author = "User3",
+            message = "Message3",
+            time = "9:13",
+            icon = R.drawable.fox
+        ),
+        Chat(
+            id = 4,
+            title = "Title4",
+            author = "User4",
+            message = "Message4",
+            time = "4:17",
+            icon = R.drawable.giraffe
+        ),
+        Chat(
+            id = 5,
+            title = "Title5",
+            author = "User5",
+            message = "Message5",
+            time = "10:00",
+            icon = R.drawable.koala
+        ),
+        Chat(
+            id = 6,
+            title = "Title6",
+            author = "User6",
+            message = "Message6",
+            time = "10:35",
+            icon = R.drawable.lion
+        ),
+        Chat(
+            id = 7,
+            title = "Title7",
+            author = "User7",
+            message = "Message7",
+            time = "15:16",
+            icon = R.drawable.owl
+        ),
+        Chat(
+            id = 8,
+            title = "Title8",
+            author = "User8",
+            message = "Message8",
+            time = "16:22",
+            icon = R.drawable.panda
+        ),
+        Chat(
+            id = 9,
+            title = "Title9",
+            author = "User9",
+            message = "Message9",
+            time = "21:18",
+            icon = R.drawable.rabbit
+        ),
+        Chat(
+            id = 10,
+            title = "Title10",
+            author = "User10",
+            message = "Message10",
+            time = "22:45",
+            icon = R.drawable.wolf
+        )
+    )
+
+    fun getMessages(): List<Chat> = messagesList
+}

app/src/main/java/otus/gpb/recyclerview/ItemTouchHelperCallback.kt

@@ -0,0 +1,31 @@
+package otus.gpb.recyclerview
+
+import androidx.recyclerview.widget.ItemTouchHelper
+import androidx.recyclerview.widget.RecyclerView
+
+class ItemTouchHelperCallback(private val listener: MessagesAdapterListener) : ItemTouchHelper.Callback() {
+    override fun getMovementFlags(
+        recyclerView: RecyclerView,
+        viewHolder: RecyclerView.ViewHolder
+    ): Int {
+        return makeMovementFlags(
+            0,
+            ItemTouchHelper.LEFT
+        )
+    }
+
+    override fun onMove(
+        recyclerView: RecyclerView,
+        viewHolder: RecyclerView.ViewHolder,
+        target: RecyclerView.ViewHolder
+    ): Boolean {
+        return false
+    }
+
+    override fun onSwiped(
+        viewHolder: RecyclerView.ViewHolder,
+        direction: Int
+    ) {
+        listener.onItemSwipe(viewHolder.adapterPosition)
+    }
+}

app/src/main/java/otus/gpb/recyclerview/MainActivity.kt

@@ -2,11 +2,58 @@ package otus.gpb.recyclerview
 
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import androidx.recyclerview.widget.DividerItemDecoration
+import androidx.recyclerview.widget.ItemTouchHelper
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
 
-class MainActivity : AppCompatActivity() {
+class MainActivity : AppCompatActivity(), MessagesAdapterListener {
+
+    private lateinit var recycleView: RecyclerView
+    private lateinit var layoutManager: LinearLayoutManager
+
+    private val messagesAdapter by lazy { MessagesAdapter() }
+    private val messagesListDataSource = DataSource().getMessages()
+
+    private val messagesList = mutableListOf<Chat>()
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        recycleView = findViewById<RecyclerView>(R.id.recyclerView)
+        layoutManager = LinearLayoutManager(this)
+        recycleView.layoutManager = layoutManager
+        recycleView.addItemDecoration(DividerItemDecoration(this, DividerItemDecoration.VERTICAL))
+        ItemTouchHelper(ItemTouchHelperCallback(this)).attachToRecyclerView(recycleView)
+
+        messagesList.addAll(messagesListDataSource)
+
+        updateRecyclerView(messagesList)
+
+        val scrollListener = ScrollListener(layoutManager) {
+            loadMoreMessages()
+        }
+        recycleView.addOnScrollListener(scrollListener)
+        scrollListener.onLoadFinished()
+    }
+
+    override fun onItemSwipe(position: Int) {
+        val newList = messagesList.toMutableList()
+        newList.removeAt(position)
+        messagesList.clear()
+        messagesList.addAll(newList)
+
+        updateRecyclerView(messagesList)
+    }
+
+    private fun updateRecyclerView(messagesList: List<Chat>) {
+        messagesAdapter.submitList(messagesList)
+        recycleView.adapter = messagesAdapter
+    }
+
+    private fun loadMoreMessages() {
+        messagesList.addAll(messagesListDataSource)
+        updateRecyclerView(messagesList)
     }
 }

app/src/main/java/otus/gpb/recyclerview/MessageViewHolder.kt

@@ -0,0 +1,26 @@
+package otus.gpb.recyclerview
+
+import android.view.View
+import android.widget.ImageView
+import android.widget.TextView
+import androidx.core.content.res.ResourcesCompat
+import androidx.recyclerview.widget.RecyclerView
+
+class MessageViewHolder(val view: View) : RecyclerView.ViewHolder(view) {
+    private val title: TextView by lazy { view.findViewById(R.id.title) }
+    private val author: TextView by lazy { view.findViewById(R.id.author) }
+    private val message: TextView by lazy { view.findViewById(R.id.message) }
+    private val time: TextView by lazy { view.findViewById(R.id.time) }
+    private val icon: ImageView by lazy { view.findViewById(R.id.icon) }
+
+    fun bind(chat: Chat) {
+        val drawableImage = ResourcesCompat
+            .getDrawable(view.resources, chat.icon, null)
+        icon.setImageDrawable(drawableImage)
+
+        title.text = chat.title
+        author.text = chat.author
+        message.text = chat.message
+        time.text = chat.time
+    }
+}

app/src/main/java/otus/gpb/recyclerview/MessagesAdapter.kt

@@ -0,0 +1,25 @@
+package otus.gpb.recyclerview
+
+import android.view.LayoutInflater
+import android.view.ViewGroup
+import androidx.recyclerview.widget.ListAdapter
+
+class MessagesAdapter() :
+    ListAdapter<Chat, MessageViewHolder>(MessagesDiffCallback()) {
+    override fun onCreateViewHolder(
+        parent: ViewGroup,
+        viewType: Int
+    ): MessageViewHolder {
+        val view = LayoutInflater
+            .from(parent.context)
+            .inflate(R.layout.chat_item, parent, false)
+        return MessageViewHolder(view)
+    }
+
+    override fun onBindViewHolder(
+        holder: MessageViewHolder,
+        position: Int
+    ) {
+        holder.bind(getItem(position))
+    }
+}

app/src/main/java/otus/gpb/recyclerview/MessagesAdapterListener.kt

@@ -0,0 +1,5 @@
+package otus.gpb.recyclerview
+
+interface MessagesAdapterListener {
+    fun onItemSwipe(position: Int)
+}

app/src/main/java/otus/gpb/recyclerview/MessagesDiffCallback.kt

@@ -0,0 +1,19 @@
+package otus.gpb.recyclerview
+
+import androidx.recyclerview.widget.DiffUtil
+
+class MessagesDiffCallback: DiffUtil.ItemCallback<Chat>() {
+    override fun areItemsTheSame(
+        oldItem: Chat,
+        newItem: Chat
+    ): Boolean {
+       return oldItem == newItem
+    }
+
+    override fun areContentsTheSame(
+        oldItem: Chat,
+        newItem: Chat
+    ): Boolean {
+        return oldItem.id == newItem.id
+    }
+}

app/src/main/java/otus/gpb/recyclerview/ScrollListener.kt

@@ -0,0 +1,30 @@
+package otus.gpb.recyclerview
+
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
+
+class ScrollListener(
+    private val layoutManager: LinearLayoutManager,
+    private val loadMore: () -> Unit
+) : RecyclerView.OnScrollListener() {
+
+    private var isLoading = false
+
+    override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
+        if (dy <= 0) return
+
+        val totalItemCount = layoutManager.itemCount
+        val lastVisibleItem = layoutManager.findLastVisibleItemPosition()
+
+        val isAtEnd = lastVisibleItem >= totalItemCount - 3
+
+        if (!isLoading && isAtEnd) {
+            isLoading = true
+            loadMore()
+        }
+    }
+
+    fun onLoadFinished() {
+        isLoading = false
+    }
+}

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

@@ -3,6 +3,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     tools:context=".MainActivity">
 
     <androidx.recyclerview.widget.RecyclerView

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

@@ -0,0 +1,55 @@
+<?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"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:padding="10dp">
+
+    <androidx.cardview.widget.CardView
+        android:id="@+id/card"
+        android:layout_width="100dp"
+        android:layout_height="100dp"
+        app:cardCornerRadius="50dp">
+
+        <ImageView
+            android:id="@+id/icon"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:scaleType="centerCrop"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent" />
+    </androidx.cardview.widget.CardView>
+
+    <TextView
+        android:id="@+id/title"
+        android:layout_width="200dp"
+        android:layout_height="35dp"
+        android:layout_marginStart="20dp"
+        app:layout_constraintStart_toEndOf="@id/card"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <TextView
+        android:id="@+id/author"
+        android:layout_width="200dp"
+        android:layout_height="35dp"
+        android:layout_marginStart="20dp"
+        app:layout_constraintStart_toEndOf="@id/card"
+        app:layout_constraintTop_toBottomOf="@id/title" />
+
+    <TextView
+        android:id="@+id/message"
+        android:layout_width="200dp"
+        android:layout_height="35dp"
+        android:layout_marginStart="20dp"
+        app:layout_constraintStart_toEndOf="@id/card"
+        app:layout_constraintTop_toBottomOf="@id/author" />
+
+    <TextView
+        android:id="@+id/time"
+        android:layout_width="40dp"
+        android:layout_height="35dp"
+        android:layout_marginStart="20dp"
+        app:layout_constraintStart_toEndOf="@id/title"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -7,4 +7,7 @@
     <color name="teal_700">#FF018786</color>
     <color name="black">#FF000000</color>
     <color name="white">#FFFFFFFF</color>
+    <color name="neutral_blue">#517DA2</color>
+    <color name="dark_blue">#416482</color>
+    <color name="light_blue">#66A9E0</color>
 </resources>

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

@@ -1,3 +1,4 @@
 <resources>
-    <string name="app_name">RecyclerView</string>
+    <string name="app_name">Telegram</string>
+    <!-- TODO: Remove or change this placeholder text -->
 </resources>