🚩 오늘 만들 아이!

🚩 만들기

1. 요로코롬 Fragment class들을 만들어 줍니다.
   레이아웃도 추가해주세요.
   
2. res > menu 에 item들을 담을 xml을 만들어 주세여~!

![](https://velog.velcdn.com/images%2Fjinny_0422%2Fpost%2Fb2b33d90-2188-410f-9396-18d1ff838163%2FGIF%202021-03-24%20%EC%98%A4%ED%9B%84%206-51-40.gif)<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/action_home"
        android:icon="@drawable/ic_home_solid"
        android:title="@string/home"/>
    <item
        android:id="@+id/action_search"
        android:icon="@drawable/ic_search_solid"
        android:title="@string/search"/>
    <item
        android:id="@+id/action_add_photo"
        android:icon="@drawable/ic_camera_solid"
        android:title="@string/gallery"/>
</menu>

3. 위치하고 싶은 곳에 BottomNavigationView와 Fragment를 보여줄 FrameLayout 추가! (ex. activity_main)

<com.google.android.material.bottomnavigation.BottomNavigationView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        //2번에서 만든 xml 추가
        app:menu="@menu/bottom_navigation_menu"
        android:id="@+id/nav_bottom"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"/>

  <FrameLayout
        android:id="@+id/view_main"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintBottom_toTopOf="@id/nav_bottom"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/division_line"/>       

4. 이제 만들어준 BottomNavigationView의 item이 클릭되면 각각의 Fragment를 가져오도록 설정해준다.

//리스너 extends
class MainActivity : AppCompatActivity(),BottomNavigationView.OnNavigationItemSelectedListener {

    lateinit var bottomNavigationView : BottomNavigationView
    
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        bottomNavigationView = findViewById(R.id.nav_bottom)
        bottomNavigationView.setOnNavigationItemSelectedListener(this)

        //첫 프래그먼트 화면은 home fragment로
        bottomNavigationView.selectedItemId = R.id.action_home
    }

    //Implement member
    override fun onNavigationItemSelected(item: MenuItem): Boolean {
        when(item.itemId){
            R.id.action_home ->{
                val fragment = HomeFragment()
                supportFragmentManager.beginTransaction()
                    .replace(R.id.view_main,fragment)
                    // view_main이 보여지는 화면에 fragment를 보여줘라
                    .commit()
                return true
            }
            R.id.action_search ->{
                val fragment = SearchFragment()
                supportFragmentManager.beginTransaction()
                    .replace(R.id.view_main,fragment)
                    .commit()
                return true
            }
            R.id.action_info ->{
                val fragment = InfoFragment()
                supportFragmentManager.beginTransaction()
                    .replace(R.id.view_main,fragment)
                    .commit()
                return true
            }
        }
        return false
    }
}