[안드로이드] Navigation Component

build.gradle

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

 

 

res -> new -> resource file

 

navigation.xml

<?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/nav_graph"
    app:startDestination="@id/first">

    <fragment
        android:id="@+id/first"
        android:name="com.example.android.FirstFragment"
        android:label="fragment_first"
        tools:layout="@layout/fragment_first" >
    </fragment>
    <fragment
        android:id="@+id/second"
        android:name="com.example.android.SecondFragment"
        android:label="fragment_second"
        tools:layout="@layout/fragment_second" >
    </fragment>
    <fragment
        android:id="@+id/third"
        android:name="com.example.android.ThirdFragment"
        android:label="fragment_third"
        tools:layout="@layout/fragment_third" >
    </fragment>
    <fragment
        android:id="@+id/fourth"
        android:name="com.example.android.FourthFragment"
        android:label="fragment_fourth"
        tools:layout="@layout/fragment_fourth" >
    </fragment>
</navigation>

 

 

res -> new -> resource file

 

bottom_nav.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/first
        android:enabled="true"
        android:icon="@drawable/icon"
        android:title="First"
        />
    <item
        android:id="@+id/second"
        android:enabled="true"
        android:icon="@drawable/icon2"
        android:title="Second"
        />

    <item
        android:id="@+id/third"
        android:enabled="true"
        android:icon="@drawable/icon3"
        android:title="Third"
        />

    <item
        android:id="@+id/fourth"
        android:enabled="true"
        android:icon="@drawable/icon4"
        android:title="Fourth"
        />
</menu>

 

 

activity_main.xml

<?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=".activity.MainActivity">


    <fragment
        android:id="@+id/main_fragment"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:defaultNavHost="true"
        app:layout_constraintBottom_toTopOf="@id/nav_bar"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:navGraph="@navigation/nav_graph" />

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/nav_bar"
        android:layout_width="match_parent"
        android:layout_height="60dp"
        app:labelVisibilityMode="labeled"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/main_fragment"
        app:menu="@menu/bottom_nav" />

</androidx.constraintlayout.widget.ConstraintLayout>

 

MainActivity.kt

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

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

        val navController = findNavController(R.id.main_fragment)

        binding.navBar.setupWithNavController(navController)
    }
}

 

메뉴 클릭 색 변경 방법

activity_main.xml에서 BottomNavigationView에 다음 속성 추가

app:itemIconTint="@drawable/bottom_nav_selector"  //아이콘 색상
app:itemTextColor="@drawable/bottom_nav_selector" //글씨 색상

 

drawable/bottom_nav_selector

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:color="@color/light_purple" android:state_checked="true"/>
    <item android:color="@color/gray" android:state_checked="false"/>
</selector>

 

선택한 메뉴는 light_purple

미선택 메뉴는 gray 색상으로 나타난다.