[Kotlin] Jetpack BottomNavigationView

Jetpack BottomNavigationView

 

하단 내비게이션 바는 앱의 기본 대상 간 이동을 허용한다. 하단 내비게이션 바는 화면 하단에 3~5개의 목적지를 표시한다. 각 목적지는 아이콘과 선택적 텍스트 레이블로 표시된다. 하단 내비게이션 아이콘을 탭하면 사용자는 해당 아이콘과 연결된 최상위 내비게이션 대상으로 이동한다.

 

build.gradle

 

implementation 'androidx.navigation:navigation-fragment-ktx:2.5.3'
implementation 'androidx.navigation:navigation-ui-ktx:2.5.3'

 

xml : navigation

 

res에서 navigation 폴더를 만들고 nav_graph.xml을 생성한다.

 

<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main_activity_navgraph"
    app:startDestination="@id/frag1">

    <fragment
        android:id="@+id/frag1"
        android:name="com.example.example.fragment.frag1"
        android:label="fragment_1"
        tools:layout="@layout/fragment_1" />
    <fragment
        android:id="@+id/frag2"
        android:name="com.example.example.fragment.frag2"
        android:label="fragment_2"
        tools:layout="@layout/fragment_2" />
    <fragment
        android:id="@+id/frag3"
        android:name="com.example.example.fragment.frag3"
        android:label="fragment_3"
        tools:layout="@layout/fragment_3" />
    <fragment
        android:id="@+id/frag4"
        android:name="com.example.example.fragment.frag4"
        android:label="fragment_4"
        tools:layout="@layout/fragment_4" />

</navigation>

 

xml : menu

 

res에서 menu 폴더를 만들고 bottom_navigation.xml을 생성한다.

 

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/frag1"
        android:icon="@drawable/ic_frag1"
        android:enabled="true"
        android:title="a"
        />
    <item
        android:id="@+id/frag2"
        android:icon="@drawable/ic_frag2"
        android:enabled="true"
        android:title="b"
        />
    <item
        android:id="@+id/frag3"
        android:icon="@drawable/ic_frag3"
        android:enabled="true"
        android:title="c"
        />
    <item
        android:id="@+id/frag4"
        android:icon="@drawable/ic_frag4"
        android:enabled="true"
        android:title="d"
        />
        
</menu>

 

xml : main

 

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <androidx.fragment.app.FragmentContainerView
        android:id="@+id/nav_host_fragment_container"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:defaultNavHost="true"
        app:layout_constraintBottom_toTopOf="@id/bn_menu"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:navGraph="@navigation/main_activity_nav_graph" />

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/bn_menu"
        android:layout_alignParentBottom="true"
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:background="#FFFFFF"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:labelVisibilityMode="labeled"
        app:menu="@menu/bottom_navigation" />

</androidx.constraintlayout.widget.ConstraintLayout>

 

main

 

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.navigation.fragment.NavHostFragment
import androidx.navigation.fragment.findNavController
import androidx.navigation.ui.setupWithNavController

class MainActivity : AppCompatActivity() {
    lateinit var binding : ActivityMainBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)

        val navHostFragment = supportFragmentManager.findFragmentById(R.id.nav_host_fragment_container) as NavHostFragment
        val navController = navHostFragment.findNavController()
        binding.bnMenu.setupWithNavController(navController)

    }
}

 

https://m2.material.io/components/bottom-navigation/

Material Design