TIL (Today I Learned)

오늘 공부한거!

• BottomNavigationView

  1. app/build.gradle에서 뷰 바인딩을 사용하기 위해 viewBinding만 추가해 줍니다.

     android {
         ...
         buildFeatures {
             viewBinding true
         }
     }

  2. res/menu에 BottomNavigation에 사용할 메뉴를 생성

     //menu_bottom_nav.xml
     <?xml version="1.0" encoding="utf-8"?>
     <menu xmlns:android="http://schemas.android.com/apk/res/android">
       <item
           android:id="@+id/fragment_home"
           android:title="홈"
           android:icon="@drawable/ic_home"/>
       <item
           android:id="@+id/fragment_search"
           android:title="검색"
           android:icon="@drawable/ic_search"/>
       <item
           android:id="@+id/fragment_favorite"
           android:title="즐겨찾기"
           android:icon="@drawable/ic_favorite"/>
       <item
           android:id="@+id/fragment_settings"
           android:title="설정"
           android:icon="@drawable/ic_settings"/>
     </menu>

     3.MainActivity

class MainActivity : AppCompatActivity() {
    private val binding: ActivityMainBinding by lazy {
        ActivityMainBinding.inflate(layoutInflater)
    }
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(binding.root)

        setBottomNavigationView()

        // 앱 초기 실행 시 홈화면으로 설정
        if (savedInstanceState == null) {
            binding.bottomNavigationView.selectedItemId = R.id.fragment_home
        }
    }
    
    fun setBottomNavigationView() {
        binding.bottomNavigationView.setOnItemSelectedListener { item ->
            when (item.itemId) {
                R.id.fragment_home -> {
                    supportFragmentManager.beginTransaction().replace(R.id.main_container, HomeFragment()).commit()
                    true
                }
                R.id.fragment_search -> {
                    supportFragmentManager.beginTransaction().replace(R.id.main_container, SearchFragment()).commit()
                    true
                }
                R.id.fragment_favorite -> {
                    supportFragmentManager.beginTransaction().replace(R.id.main_container, FavoriteFragment()).commit()
                    true
                }
                R.id.fragment_settings -> {
                    supportFragmentManager.beginTransaction().replace(R.id.main_container, SettingsFragment()).commit()
                    true
                }
                else -> false
            }
        }
    }
}

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