.

summer_coding_android/app/build.gradle

@@ -29,17 +29,19 @@ android {
     kotlinOptions {
         jvmTarget = '1.8'
     }
-    viewBinding {
-        enabled = true
+    buildFeatures{
+        viewBinding = true
     }
 }
 
 dependencies {
 
+    implementation 'com.google.android.material:material:1.6.1'
     implementation 'androidx.core:core-ktx:1.7.0'
     implementation 'androidx.appcompat:appcompat:1.4.2'
     implementation 'com.google.android.material:material:1.6.1'
     implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
+    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.3'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'

summer_coding_android/app/src/main/java/kr/co/landvibe/summer_coding_android/AutoClearedValue.kt

@@ -0,0 +1,61 @@
+package kr.co.landvibe.summer_coding_android
+
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * 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.
+ */
+
+import androidx.fragment.app.Fragment
+import androidx.lifecycle.DefaultLifecycleObserver
+import androidx.lifecycle.LifecycleOwner
+import kotlin.properties.ReadWriteProperty
+import kotlin.reflect.KProperty
+
+/**
+ * A lazy property that gets cleaned up when the fragment's view is destroyed.
+ *
+ * Accessing this variable while the fragment's view is destroyed will throw NPE.
+ */
+class AutoClearedValue<T : Any>(val fragment: Fragment) : ReadWriteProperty<Fragment, T> {
+    private var _value: T? = null
+
+    init {
+        fragment.lifecycle.addObserver(object: DefaultLifecycleObserver {
+            override fun onCreate(owner: LifecycleOwner) {
+                fragment.viewLifecycleOwnerLiveData.observe(fragment) { viewLifecycleOwner ->
+                    viewLifecycleOwner?.lifecycle?.addObserver(object: DefaultLifecycleObserver {
+                        override fun onDestroy(owner: LifecycleOwner) {
+                            _value = null
+                        }
+                    })
+                }
+            }
+        })
+    }
+
+    override fun getValue(thisRef: Fragment, property: KProperty<*>): T {
+        return _value ?: throw IllegalStateException(
+            "should never call auto-cleared-value get when it might not be available"
+        )
+    }
+
+    override fun setValue(thisRef: Fragment, property: KProperty<*>, value: T) {
+        _value = value
+    }
+}
+
+/**
+ * Creates an [AutoClearedValue] associated with this fragment.
+ */
+fun <T : Any> Fragment.autoCleared() = AutoClearedValue<T>(this)

summer_coding_android/app/src/main/java/kr/co/landvibe/summer_coding_android/ckgod/Ckgod2Activity.kt

@@ -3,6 +3,7 @@ package kr.co.landvibe.summer_coding_android.ckgod
 import android.content.Intent
 import android.os.Bundle
 import androidx.appcompat.app.AppCompatActivity
+import kr.co.landvibe.summer_coding_android.R
 import kr.co.landvibe.summer_coding_android.ckgod.adapters.ItemListAdapter
 import kr.co.landvibe.summer_coding_android.ckgod.data.Item
 import kr.co.landvibe.summer_coding_android.databinding.ActivityCkgod2Binding
@@ -11,11 +12,11 @@ class Ckgod2Activity : AppCompatActivity() {
     private lateinit var binding: ActivityCkgod2Binding
 
     val data: List<Item> = listOf(
-        Item("1", "고창국"),
-        Item("1", "고창국"),
-        Item("1", "고창국1"),
-        Item("1", "고창국1"),
-        Item("1", "고창2국"),
+        Item(R.drawable.profile_common, "고창국"),
+        Item(R.drawable.profile_common, "고창국"),
+        Item(R.drawable.profile_common, "고창국1"),
+        Item(R.drawable.profile_common, "고창국1"),
+        Item(R.drawable.profile_common, "고창2국"),
     )
 
     override fun onCreate(savedInstanceState: Bundle?) {

summer_coding_android/app/src/main/java/kr/co/landvibe/summer_coding_android/ckgod/data/Item.kt

@@ -2,6 +2,6 @@ package kr.co.landvibe.summer_coding_android.ckgod.data
 
 // class와 data class의 차이 알아보기!
 data class Item(
-    val image: String,
+    val image: Int,
     val name: String
 )

summer_coding_android/app/src/main/java/kr/co/landvibe/summer_coding_android/d11210920/D11210920Activity.kt

@@ -2,11 +2,39 @@ package kr.co.landvibe.summer_coding_android.d11210920
 
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import com.google.android.material.bottomnavigation.BottomNavigationView
 import kr.co.landvibe.summer_coding_android.R
+import kr.co.landvibe.summer_coding_android.d11210920.friendsFragment
+import kr.co.landvibe.summer_coding_android.databinding.ActivityD11210920Binding
 
 class D11210920Activity : AppCompatActivity() {
+
+    private val binding by lazy{ActivityD11210920Binding.inflate(layoutInflater)}
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        setContentView(R.layout.activity_d11210920)
+        setContentView(binding.root)
+
+        val bnvmain = binding.bottomNavigationView
+
+        supportFragmentManager.beginTransaction().add(binding.linearLayout.id,friendsFragment()).commit()
+
+        bnvmain.setOnItemSelectedListener { item ->
+            when(item.itemId){
+                R.id.page_friendlist ->{
+                    supportFragmentManager.beginTransaction().replace(R.id.linearLayout,friendsFragment()).commitAllowingStateLoss()
+                    return@setOnItemSelectedListener true
+                }
+                R.id.page_chatlist ->{
+                    supportFragmentManager.beginTransaction().replace(R.id.linearLayout,chatFragment()).commitAllowingStateLoss()
+                    return@setOnItemSelectedListener true
+                }
+                else -> {return@setOnItemSelectedListener false}
+            }
+        }
+
     }
+
+
+
 }

summer_coding_android/app/src/main/java/kr/co/landvibe/summer_coding_android/d11210920/chatFragment.kt

@@ -0,0 +1,65 @@
+package kr.co.landvibe.summer_coding_android.d11210920
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import androidx.recyclerview.widget.RecyclerView
+import kr.co.landvibe.summer_coding_android.AutoClearedValue
+import kr.co.landvibe.summer_coding_android.R
+import kr.co.landvibe.summer_coding_android.databinding.*
+
+class chatFragment : Fragment() {
+    private var binding by AutoClearedValue<FragmentChatBinding>(this)
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        binding = FragmentChatBinding.inflate(inflater, container, false)
+        return binding.root
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+
+
+        var chatdata : MutableList<chatItem> = mutableListOf()
+
+        for(i in 1..101){
+            val chatdata_ : chatItem = chatItem(R.drawable.profile,"단체채팅방${i}","안녕하세요")
+            chatdata.add(chatdata_)
+        }
+
+
+        var recyclerViewAdapter = CustomAdapter(chatdata)
+
+        binding.dhChatRv.adapter = recyclerViewAdapter
+
+    }
+
+    class CustomAdapter(private val item_List: List<chatItem>) : RecyclerView.Adapter<CustomAdapter.Holder>(){
+
+        class Holder(val binding: DhChatlistItemBinding) : RecyclerView.ViewHolder(binding.root){
+            fun setData(item: chatItem){
+                binding.dhChatName.text = item.name
+                binding.dhChatprofile.setImageDrawable(itemView.context.getDrawable(item.image))
+                binding.dhChatContent.text = item.content
+            }
+        }
+        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): Holder {
+            val binding = DhChatlistItemBinding.inflate(LayoutInflater.from(parent.context),parent,false)
+            return Holder(binding)
+        }
+
+        override fun onBindViewHolder(holder: Holder, position: Int) {
+            holder.setData(item_List[position])
+        }
+
+        override fun getItemCount(): Int {
+            return item_List.size
+        }
+
+    }
+}

summer_coding_android/app/src/main/java/kr/co/landvibe/summer_coding_android/d11210920/chatItem.kt

@@ -0,0 +1,7 @@
+package kr.co.landvibe.summer_coding_android.d11210920
+
+data class chatItem(
+    val image: Int,
+    val name: String,
+    val content: String
+)

summer_coding_android/app/src/main/java/kr/co/landvibe/summer_coding_android/d11210920/friendsFragment.kt

@@ -0,0 +1,66 @@
+package kr.co.landvibe.summer_coding_android.d11210920
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import androidx.recyclerview.widget.RecyclerView
+import kr.co.landvibe.summer_coding_android.AutoClearedValue
+import kr.co.landvibe.summer_coding_android.R
+import kr.co.landvibe.summer_coding_android.ckgod.data.Item
+import kr.co.landvibe.summer_coding_android.databinding.DhFriendslistItemBinding
+import kr.co.landvibe.summer_coding_android.databinding.FragmentFriendsBinding
+
+class friendsFragment : Fragment() {
+    private var binding by AutoClearedValue<FragmentFriendsBinding>(this)
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        binding = FragmentFriendsBinding.inflate(inflater, container, false)
+        return binding.root
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+
+        val data_ : Item = Item(R.drawable.profile,"김동하")
+
+        var data : MutableList<Item> = mutableListOf()
+
+        for(i in 0..100){
+            data.add(data_)
+        }
+
+
+        var recyclerViewAdapter = CustomAdapter(data)
+
+        binding.dhRv.adapter = recyclerViewAdapter
+
+    }
+
+    class CustomAdapter(private val item_List: List<Item>) : RecyclerView.Adapter<CustomAdapter.Holder>(){
+
+        class Holder(val binding: DhFriendslistItemBinding) : RecyclerView.ViewHolder(binding.root){
+            fun setData(item: Item){
+                binding.dhName.text = item.name
+                binding.dhProfile.setImageDrawable(itemView.context.getDrawable(item.image))
+            }
+        }
+        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): Holder {
+            val binding = DhFriendslistItemBinding.inflate(LayoutInflater.from(parent.context),parent,false)
+            return Holder(binding)
+        }
+
+        override fun onBindViewHolder(holder: Holder, position: Int) {
+            holder.setData(item_List[position])
+        }
+
+        override fun getItemCount(): Int {
+            return item_List.size
+        }
+
+    }
+}

summer_coding_android/app/src/main/res/drawable/dh_chatlist.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M20,2L4,2c-1.1,0 -1.99,0.9 -1.99,2L2,22l4,-4h14c1.1,0 2,-0.9 2,-2L22,4c0,-1.1 -0.9,-2 -2,-2zM6,9h12v2L6,11L6,9zM14,14L6,14v-2h8v2zM18,8L6,8L6,6h12v2z"/>
+</vector>

summer_coding_android/app/src/main/res/drawable/dh_friendslist.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M19,3h-4.18C14.4,1.84 13.3,1 12,1c-1.3,0 -2.4,0.84 -2.82,2L5,3c-1.1,0 -2,0.9 -2,2v14c0,1.1 0.9,2 2,2h14c1.1,0 2,-0.9 2,-2L21,5c0,-1.1 -0.9,-2 -2,-2zM12,3c0.55,0 1,0.45 1,1s-0.45,1 -1,1 -1,-0.45 -1,-1 0.45,-1 1,-1zM12,7c1.66,0 3,1.34 3,3s-1.34,3 -3,3 -3,-1.34 -3,-3 1.34,-3 3,-3zM18,19L6,19v-1.4c0,-2 4,-3.1 6,-3.1s6,1.1 6,3.1L18,19z"/>
+</vector>

summer_coding_android/app/src/main/res/layout/activity_d11210920.xml

@@ -6,4 +6,25 @@
     android:layout_height="match_parent"
     tools:context=".d11210920.D11210920Activity">
 
+    <LinearLayout
+        android:id="@+id/linearLayout"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:orientation="vertical"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toTopOf="@+id/bottomNavigationView"/>
+
+    <com.google.android.material.bottomnavigation.BottomNavigationView
+        android:id="@+id/bottomNavigationView"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        app:labelVisibilityMode="labeled"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:menu="@menu/bottom_navigation_menu"
+        app:itemBackground="@android:color/white"/>
+
 </androidx.constraintlayout.widget.ConstraintLayout>