하단 탭 만들기

/app/res/menu/menu_bottom.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <item
        android:id="@+id/tab1"
        android:enabled="true"
        android:icon="@android:drawable/ic_dialog_email"
        android:title="이메일"
        app:showAsAction="ifRoom" />

    <item
        android:id="@+id/tab2"
        android:icon="@android:drawable/ic_dialog_info"
        android:title="정보"
        app:showAsAction="ifRoom" />

    <item
        android:id="@+id/tab3"
        android:icon="@android:drawable/ic_dialog_map"
        android:title="위치"
        app:showAsAction="ifRoom" />

</menu>

 

@android:drawable은 안드로이드가 기본 제공하는 이미지를 참조하도록 한다

 

/drawable/item_color.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:color="#51032d" android:state_checked="true" />
    <item android:color="#CFD8DC" />
</selector>

 

 

activity_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">

    <FrameLayout
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />


    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/bottom_navigation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="0dp"
        android:layout_marginEnd="0dp"
        app:itemBackground="?colorPrimary"
        app:itemIconTint="@drawable/item_color"
        app:itemTextColor="@drawable/item_color"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:menu="@menu/menu_bottom" />

</androidx.constraintlayout.widget.ConstraintLayout>

 

 

하단 탭을 보여주는 위젯 BottomNavigationView가 하단에 표시될 수 있도록 해야한다

        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"

 

각 탭의 배경색, 아이콘 색상, 텍스트 색상을 정한다

        app:itemBackground="?colorPrimary"
        app:itemIconTint="@drawable/item_color"
        app:itemTextColor="@drawable/item_color"

 

menu 속성의 값으로 menu_bottom.xml 파일의 내용이 탭으로 보이게 한다

        app:menu="@menu/menu_bottom"

 

상단 탭 만들기에서 만들었던 프래그먼트 자바 파일들과 레이아웃 파일들을 복사해온다

 

https://junyoung-developer.tistory.com/153
BottomNavigationView의 리스너 setOnNavigationItemSelectedListener는 폐기되었다

 

 

MainActivity

package com.example.a34_bottomnavigation;

import android.os.Bundle;
import android.view.MenuItem;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

import com.google.android.material.navigation.NavigationBarView;

public class MainActivity extends AppCompatActivity {

    Fragment1 fragment1;
    Fragment2 fragment2;
    Fragment3 fragment3;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        fragment1 = new Fragment1();
        fragment2 = new Fragment2();
        fragment3 = new Fragment3();

        getSupportFragmentManager().beginTransaction().replace(R.id.container, fragment1).commit();

//        BottomNavigationView의 리스너 setOnNavigationItemSelectedListener는 폐기되었다
//        BottomNavigationView bottomNavigationView = findViewById(R.id.bottom_navigation);
//        bottomNavigationView.setOnNavigationItemSelectedListener();
        NavigationBarView navigationBarView = findViewById(R.id.bottom_navigation);
        navigationBarView.setOnItemSelectedListener(new NavigationBarView.OnItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(MenuItem item) {
                switch (item.getItemId()) {
                    case R.id.tab1:
                        Toast.makeText(getApplicationContext(), "첫 번째 탭 선택됨", Toast.LENGTH_SHORT).show();
                        getSupportFragmentManager().beginTransaction().replace(R.id.container, fragment1).commit();
                        return true;

                    case R.id.tab2:
                        Toast.makeText(getApplicationContext(), "두 번째 탭 선택됨", Toast.LENGTH_SHORT).show();
                        getSupportFragmentManager().beginTransaction().replace(R.id.container, fragment2).commit();
                        return true;

                    case R.id.tab3:
                        Toast.makeText(getApplicationContext(), "세 번째 탭 선택됨", Toast.LENGTH_SHORT).show();
                        getSupportFragmentManager().beginTransaction().replace(R.id.container, fragment3).commit();
                        return true;
                }

                return false;
            }
        });

    }
}