Homework_RecyclerView

app/build.gradle

@@ -41,4 +41,6 @@ dependencies {
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.3'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+    implementation 'androidx.recyclerview:recyclerview:1.3.2'
+    implementation 'it.xabaras.android:recyclerview-swipedecorator:1.4'
 }

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

@@ -0,0 +1,45 @@
+package otus.gpb.recyclerview
+
+import androidx.recyclerview.widget.ListAdapter
+import androidx.recyclerview.widget.RecyclerView
+import android.view.LayoutInflater
+import android.view.ViewGroup
+import androidx.recyclerview.widget.DiffUtil
+
+class ChatAdapter : ListAdapter<ChatItem, ChatViewHolder> (DiffUtilItem()) {
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ChatViewHolder {
+        return ChatViewHolder(
+            LayoutInflater.from(parent.context).inflate(R.layout.chat_item, parent, false)
+        )
+    }
+
+    override fun onBindViewHolder(viewHolder: ChatViewHolder, position: Int) {
+        viewHolder.bind(currentList[position])
+    }
+
+    fun removeItem(position: Int){
+        val list = currentList.toMutableList()
+        list.removeAt(position)
+        submitList(list)
+        notifyDataSetChanged()
+    }
+
+    fun addItems(count: Int) {
+        val list = currentList.toMutableList()
+        list.addAll(ChatDataGenerator.generateChatItemsList(count))
+        submitList(list)
+        notifyDataSetChanged()
+    }
+
+    class DiffUtilItem : DiffUtil.ItemCallback<ChatItem>() {
+
+        override fun areItemsTheSame(oldItem: ChatItem, newItem: ChatItem): Boolean {
+            return oldItem.id == newItem.id
+        }
+
+        override fun areContentsTheSame(oldItem: ChatItem, newItem: ChatItem): Boolean {
+            return oldItem == newItem
+        }
+    }
+}

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

@@ -0,0 +1,52 @@
+package otus.gpb.recyclerview
+
+object ChatDataGenerator {
+
+    private var lastId = 0
+    fun generateChatItemsList(count: Int): MutableList<ChatItem> {
+        return MutableList(count) {
+            ChatItem(
+                id = lastId++,
+                username = listOf(
+                    "Anton Karavaev",
+                    "MyWife",
+                    "George",
+                    "AK-47",
+                    "Chernomor",
+                    "Cat",
+                    "Donald Trump",
+                    "Paul McCartney",
+                    "John Lennon",
+                    "Eddie Van Halen"
+                ).random(),
+                message = listOf(
+                    "Hello",
+                    "Good day",
+                    "Здоровеньки булы...",
+                    "How're you?",
+                    "Шалом алейхем!",
+                    "Хай, пипл!"
+                ).random(),
+                userImage = listOf(
+                    R.drawable.avatar_1,
+                    R.drawable.avatar_2,
+                    R.drawable.avatar_3,
+                    R.drawable.avatar_4,
+                    R.drawable.avatar_5,
+                    R.drawable.avatar_6,
+                    R.drawable.avatar_7,
+                    R.drawable.avatar_8,
+                    R.drawable.avatar_9,
+                    R.drawable.avatar_10
+                ).random(),
+                date = listOf(
+                    "14:28",
+                    "13:45",
+                    "17:20",
+                    "21:57",
+                    "18:12"
+                ).random()
+            )
+        }
+    }
+}

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

@@ -0,0 +1,9 @@
+package otus.gpb.recyclerview
+
+data class ChatItem(
+    val id: Int,
+    val userImage: Int,
+    val date: String,
+    val username: String,
+    val message: String
+)

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

@@ -0,0 +1,21 @@
+package otus.gpb.recyclerview
+
+import android.view.View
+import android.widget.TextView
+import androidx.recyclerview.widget.RecyclerView
+import com.google.android.material.imageview.ShapeableImageView
+
+class ChatViewHolder(private val view: View) : RecyclerView.ViewHolder(view) {
+
+    private val userImage = view.findViewById<ShapeableImageView>(R.id.user_avatar)
+    private val username = view.findViewById<TextView>(R.id.username)
+    private val message = view.findViewById<TextView>(R.id.message)
+    private val date = view.findViewById<TextView>(R.id.published_date)
+
+    fun bind(item: ChatItem) {
+        userImage.setImageResource(item.userImage)
+        username.text = item.username
+        message.text = item.message
+        date.text = item.date
+    }
+}

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

@@ -0,0 +1,30 @@
+package otus.gpb.recyclerview
+
+import androidx.recyclerview.widget.ItemTouchHelper
+import androidx.recyclerview.widget.RecyclerView
+
+class ItemTouchHelperCallback() : ItemTouchHelper.Callback() {
+
+    override fun getMovementFlags(
+        recyclerView: RecyclerView,
+        viewHolder: RecyclerView.ViewHolder
+    ): Int = makeMovementFlags(0, ItemTouchHelper.LEFT)
+
+    override fun onMove(
+        recyclerView: RecyclerView,
+        viewHolder: RecyclerView.ViewHolder,
+        target: RecyclerView.ViewHolder
+    ): Boolean = false
+
+    override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
+        viewHolder.chatAdapter.removeItem(viewHolder.bindingAdapterPosition)
+    }
+
+    override fun getSwipeThreshold(viewHolder: RecyclerView.ViewHolder): Float {
+        return 0.50f
+    }
+
+    private val RecyclerView.ViewHolder.chatAdapter: ChatAdapter
+        get() = bindingAdapter as ChatAdapter
+
+}

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

@@ -2,11 +2,53 @@ package otus.gpb.recyclerview
 
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import androidx.core.content.ContextCompat
+import androidx.recyclerview.widget.DividerItemDecoration
+import androidx.recyclerview.widget.ItemTouchHelper
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
 
 class MainActivity : AppCompatActivity() {
 
+    private lateinit var list: MutableList<ChatItem>
+    private val adapter by lazy { ChatAdapter() }
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        val recyclerView: RecyclerView = findViewById(R.id.recyclerView)
+
+        val layoutManager = recyclerView.layoutManager as LinearLayoutManager
+
+        val divider = DividerItemDecoration(this, DividerItemDecoration.VERTICAL)
+        divider.setDrawable(
+            ContextCompat.getDrawable(this, R.drawable.divider)
+                ?: error("Not divider drawable")
+        )
+
+        recyclerView.addItemDecoration(divider)
+
+        ItemTouchHelper(ItemTouchHelperCallback()).attachToRecyclerView(recyclerView)
+
+        list = ChatDataGenerator.generateChatItemsList(20)
+
+        recyclerView.adapter = adapter
+
+        adapter.submitList(list)
+
+        recyclerView.addOnScrollListener(object : RecyclerView.OnScrollListener() {
+
+            override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
+                super.onScrolled(recyclerView, dx, dy)
+
+                val totalItemCount = layoutManager.itemCount
+                val lastVisibleItem = layoutManager.findLastVisibleItemPosition()
+
+                if (lastVisibleItem + 1 == totalItemCount) {
+                    adapter.addItems(5)
+                }
+            }
+        })
     }
 }

app/src/main/res/drawable/avatar_1.xml

@@ -0,0 +1,40 @@
+<!--
+  ~ Copyright 2015 Google Inc. All Rights Reserved.
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="128dp"
+        android:height="128dp"
+        android:viewportHeight="128.0"
+        android:viewportWidth="128.0">
+    <path
+            android:fillColor="#FF8A80"
+            android:pathData="M0 0h128v128h-128z" />
+    <path
+            android:fillColor="#FFE0B2"
+            android:pathData="M36.3 94.8c6.4 7.3 16.2 12.1 27.3 12.4 10.7,-.3 20.3,-4.7 26.7,-11.6l.2.1c-17,-13.3,-12.9,-23.4,-8.5,-28.6 1.3,-1.2 2.8,-2.5 4.4,-3.9l13.1,-11c1.5,-1.2 2.6,-3 2.9,-5.1.6,-4.4,-2.5,-8.4,-6.9,-9.1,-1.5,-.2,-3 0,-4.3.6,-.3,-1.3,-.4,-2.7,-1.6,-3.5,-1.4,-.9,-2.8,-1.7,-4.2,-2.5,-7.1,-3.9,-14.9,-6.6,-23,-7.9,-5.4,-.9,-11,-1.2,-16.1.7,-3.3 1.2,-6.1 3.2,-8.7 5.6,-1.3 1.2,-2.5 2.4,-3.7 3.7l-1.8 1.9c-.3.3,-.5.6,-.8.8,-.1.1,-.2 0,-.4.2.1.2.1.5.1.6,-1,-.3,-2.1,-.4,-3.2,-.2,-4.4.6,-7.5 4.7,-6.9 9.1.3 2.1 1.3 3.8 2.8 5.1l11 9.3c1.8 1.5 3.3 3.8 4.6 5.7 1.5 2.3 2.8 4.9 3.5 7.6 1.7 6.8,-.8 13.4,-5.4 18.4,-.5.6,-1.1 1,-1.4 1.7,-.2.6,-.4 1.3,-.6 2,-.4 1.5,-.5 3.1,-.3 4.6.4 3.1 1.8 6.1 4.1 8.2 3.3 3 8 4 12.4 4.5 5.2.6 10.5.7 15.7.2 4.5,-.4 9.1,-1.2 13,-3.4 5.6,-3.1 9.6,-8.9 10.5,-15.2m-14.4,-49.8c.9 0 1.6.7 1.6 1.6 0 .9,-.7 1.6,-1.6 1.6,-.9 0,-1.6,-.7,-1.6,-1.6,-.1,-.9.7,-1.6 1.6,-1.6zm-25.7 0c.9 0 1.6.7 1.6 1.6 0 .9,-.7 1.6,-1.6 1.6,-.9 0,-1.6,-.7,-1.6,-1.6,-.1,-.9.7,-1.6 1.6,-1.6z" />
+    <path
+            android:fillColor="#E0F7FA"
+            android:pathData="M105.3 106.1c-.9,-1.3,-1.3,-1.9,-1.3,-1.9l-.2,-.3c-.6,-.9,-1.2,-1.7,-1.9,-2.4,-3.2,-3.5,-7.3,-5.4,-11.4,-5.7 0 0 .1 0 .1.1l-.2,-.1c-6.4 6.9,-16 11.3,-26.7 11.6,-11.2,-.3,-21.1,-5.1,-27.5,-12.6,-.1.2,-.2.4,-.2.5,-3.1.9,-6 2.7,-8.4 5.4l-.2.2s-.5.6,-1.5 1.7c-.9 1.1,-2.2 2.6,-3.7 4.5,-3.1 3.9,-7.2 9.5,-11.7 16.6,-.9 1.4,-1.7 2.8,-2.6 4.3h109.6c-3.4,-7.1,-6.5,-12.8,-8.9,-16.9,-1.5,-2.2,-2.6,-3.8,-3.3,-5z" />
+    <path
+            android:fillColor="#444"
+            android:pathData="M76.3,47.5 m-2.0, 0 a 2.0,2.0 0 1,1 4.0,0 a2.0,2.0 0 1,1 -4.0,0" />
+    <path
+            android:fillColor="#444"
+            android:pathData="M50.7,47.6 m-2.0, 0 a 2.0,2.0 0 1,1 4.0,0 a2.0,2.0 0 1,1 -4.0,0" />
+    <path
+            android:fillColor="#444"
+            android:pathData="M48.1 27.4c4.5 5.9 15.5 12.1 42.4 8.4,-2.2,-6.9,-6.8,-12.6,-12.6,-16.4 17.2 1.5 14.1,-9.4 14.1,-9.4,-1.4 5.5,-11.1 4.4,-11.1 4.4h-18.8c-1.7,-.1,-3.4 0,-5.2.3,-12.8 1.8,-22.6 11.1,-25.7 22.9 10.6,-1.9 15.3,-7.6 16.9,-10.2z" />
+</vector>

app/src/main/res/drawable/avatar_10.xml

@@ -0,0 +1,49 @@
+<!--
+  ~ Copyright 2015 Google Inc. All Rights Reserved.
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="128dp"
+        android:height="128dp"
+        android:viewportHeight="128.0"
+        android:viewportWidth="128.0">
+    <path
+            android:fillColor="#FFCC80"
+            android:pathData="M41.6 123.8s0 .1,-.1.1l.3,-.4c-.1.2,-.1.2,-.2.3z" />
+    <path
+            android:fillColor="#FFFF8D"
+            android:pathData="M0 0h128v128h-128z" />
+    <path
+            android:fillColor="#C2C2C2"
+            android:pathData="M83.2 26.6c.1,-.9.2,-1.8.2,-2.7 0,-10.4,-8.4,-18.9,-18.8,-18.9s-18.8 8.4,-18.8 18.8c0 1.4.2 2.7.4 4 5.4,-4 12.2,-6.4 19.4,-6.4 6.5.1 12.5 2 17.6 5.2z" />
+    <path
+            android:fillColor="#848484"
+            android:pathData="M41.4 58.4c9.6,-1.9 10.3,-10.7 11.7,-13.2 4.2 5.4 12.4 16.6 36.8 13.5 1.5,-2.5 4.4,-6 7.4,-5.6.3 0 .6.1 1 .2,-.3,-11.3,-6.3,-21.2,-15.2,-26.8,-5.1,-3.2,-11.1,-5.1,-17.5,-5.1,-7.3 0,-14 2.4,-19.4 6.4,-7.9 5.9,-13.1 15.2,-13.3 25.7.4,-.1.9 1.7 1.4 1.7 2.8,-.4 5.6 1 7.1 3.2z" />
+    <path
+            android:fillColor="#FF5722"
+            android:pathData="M109.6 121.5c-1.2,-2,-2.2,-3.6,-2.9,-4.8l-1.2,-1.8,-.2,-.3c-.5,-.8,-1.1,-1.6,-1.8,-2.3,-3.1,-3.3,-6.9,-5.1,-10.8,-5.3 0 0 .1 0 .1.1l-.2,-.1c-3.4 3.7,-7.8 6.6,-12.7 8.5v12.5h33.4c-1.4,-2.5,-2.6,-4.7,-3.7,-6.5zm-67.6,-15.5l-.2.5c-2.9.8,-5.6 2.5,-7.8 5.1l-.2.2s-.5.6,-1.4 1.6c-.9 1,-2 2.4,-3.5 4.2,-2.1 2.6,-4.7 6.1,-7.5 10.4h28v-15.7c-2.8,-1.7,-5.3,-3.8,-7.4,-6.3z" />
+    <path
+            android:fillColor="#E0F7FA"
+            android:pathData="M67.7 117.7c-6.8,-.2,-13.1,-2.1,-18.3,-5.4v15.7h30.5v-12.6c-3.8 1.4,-7.9 2.2,-12.2 2.3z" />
+    <path
+            android:fillColor="#FFE0B2"
+            android:pathData="M42 106c2.1 2.4 4.6 4.5 7.4 6.3 5.2 3.3 11.5 5.3 18.3 5.4 4.3,-.1 8.4,-.9 12.1,-2.3 5,-1.9 9.3,-4.8 12.7,-8.5l.2.1s-.1 0,-.1,-.1c-15.7,-12.3,-12,-21.7,-7.8,-26.6 1.3,-1.1 2.6,-2.3 4.1,-3.6l12.2,-10.3c1.4,-1.2 2.4,-2.8 2.7,-4.8.5,-3.8,-1.9,-7.3,-5.4,-8.2,-.3,-.1,-.6,-.2,-1,-.2,-3.1,-.4,-5.9 1.1,-7.4 3.6,-24.4 3.1,-32.7,-8.1,-36.8,-13.5,-1.5 2.4,-2.1 11.3,-11.7 13.2,-1.6,-2.3,-4.3,-3.6,-7.2,-3.2l-1.4.3c-3.4 1.1,-5.5 4.5,-5 8.1.3 1.9 1.3 3.6 2.6 4.7l10.2 8.7c5.8 6 14.1 18.3 1.4 30.7,-.1.1,-.1.2,-.1.2zm37.6,-45.3c.8 0 1.5.7 1.5 1.5s-.7 1.5,-1.5 1.5,-1.5,-.7,-1.5,-1.5c-.1,-.9.6,-1.5 1.5,-1.5zm-24 0c.8 0 1.5.7 1.5 1.5s-.7 1.5,-1.5 1.5,-1.5,-.7,-1.5,-1.5c-.1,-.9.6,-1.5 1.5,-1.5z" />
+    <path
+            android:fillColor="#444"
+            android:pathData="M79.6,62.2 m-2.0, 0 a 2.0,2.0 0 1,1 4.0,0 a2.0,2.0 0 1,1 -4.0,0" />
+    <path
+            android:fillColor="#444"
+            android:pathData="M55.6,62.2 m-2.0, 0 a 2.0,2.0 0 1,1 4.0,0 a2.0,2.0 0 1,1 -4.0,0" />
+</vector>

app/src/main/res/drawable/avatar_2.xml

@@ -0,0 +1,43 @@
+<!--
+  ~ Copyright 2015 Google Inc. All Rights Reserved.
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="128dp"
+        android:height="128dp"
+        android:viewportHeight="128.0"
+        android:viewportWidth="128.0">
+    <path
+            android:fillColor="#B9F6CA"
+            android:pathData="M0 0h128v128h-128z" />
+    <path
+            android:fillColor="#FFCC80"
+            android:pathData="M70.1 122.5l.6,-.1c6.1,-.8 12,-2.4 17.7,-4.8 1.2,-.5 2.4,-1.1 3.2,-2.1 1.3,-1.7,-.1,-5.6,-.5,-7.7,-.7,-3.8,-1.3,-7.7,-1.9,-11.5,-.7,-4.5,-1.5,-9.1,-1.6,-13.7,-.2,-7.6.7,-12.3 1.9,-15.3h9l-2.6,-10.4c-.2,-2.4,-.4,-4.8,-.7,-6.8,-.2,-1.9,-.6,-3.6,-1.2,-5.3,-14.9 2.2,-24.5.9,-30.7,-1.8l-23.1 4.5,-.7.1h-.7c-.4,-.1,-.9,-.2,-1.2,-.4,-.4 0,-.9 0,-1.4.1,-4.1.6,-6.9 4.7,-6.3 9.1.3 2 1.2 3.8 2.6 5 .3.1 1.6.7 3.4 1.7.8.4 1.6 1 2.5 1.6 1.5 1.1 3.2 2.5 4.9 4.1 5.8 5.9 8.4 13.8 7.4 22,-.6 4.7,-2.2 9.4,-4.4 13.6,-.5 1,-1 1.6,-1.1 2.8,-.1 1.1,-.1 2.3.1 3.4.4 2.3 1.5 4.4 3 6.2 2.6 3.1 6.4 5 10.4 5.8 3.8.4 7.6.3 11.4,-.1zm9.5,-67.6c.9 0 1.6.7 1.6 1.6 0 .9,-.7 1.6,-1.6 1.6s-1.6,-.7,-1.6,-1.6c-.1,-.8.7,-1.6 1.6,-1.6zM128 97.7c-3.3 1.9,-6.6 3.7,-9.9 5.3,-3.2 1.5,-6.3 2.9,-9.6 4.2,-.9.4,-2.1.5,-2.9 1.1,-1.1.8,-1.9 2.5,-2.3 3.7,-.6 1.6,-.6 3.4.3 4.8.8 1.2 2.1 2 3.5 2.6 5.9 2.9 12.2 5.1 18.6 6.5 1.4.3 2.3 1.8 2.4.1v-28.1c-.1.1,-.1,-.1,-.1,-.2z" />
+    <path
+            android:fillColor="#444"
+            android:pathData="M94.2 44.9c-.8,-2.6,-1.8,-5,-3.2,-7.2l-7.2 1.4,-20.4 4c6.3 2.7 15.9 4 30.8 1.8z" />
+    <path
+            android:fillColor="#E65100"
+            android:pathData="M38.9 48.4h.7c.2 0 .5 0 .7,-.1l23.1,-4.5 20.4,-4 23.3,-4.5c1.9,-.4 3.2,-2 2.9,-3.6,-.3,-1.6,-2.1,-2.6,-4.1,-2.3l-19.6 3.8,-1.3,-6.8c-2,-10.9,-15,-17.7,-29.1,-14.9,-14 2.7,-23.7 13.9,-21.6 24.9h.1l1.7 9v.7c.2.8.7 1.4 1.4 1.9.5.1 1 .3 1.4.4z" />
+    <path
+            android:fillColor="#444"
+            android:pathData="M79.6,56.5 m-2.0, 0 a 2.0,2.0 0 1,1 4.0,0 a2.0,2.0 0 1,1 -4.0,0" />
+    <path
+            android:fillColor="#689F38"
+            android:pathData="M128 128v-1.8l-21.7,-18.2,-.4.2,-2.9 1.3c-3 1.3,-6 2.6,-9.2 3.8l-1.4.5c-9 3.3,-16.5 4.1,-22.8 3.6,-16.4,-1.3,-23.8,-11.9,-23.8,-11.9,-2.2 4.2,-5.2 8.7,-9.2 13.5l-.3.4,-1.7 2c-.9 1.1,-2 2.6,-3.4 4.5,-.4.6,-.9 1.3,-1.4 2l98.2.1z" />
+    <path
+            android:fillColor="#FFCC80"
+            android:pathData="M36.3 119.3s.1,-.2.2,-.3c-.1.1,-.2.2,-.2.3z" />
+</vector>