Bottom Navigation Bar 만들기

 

 

---- 최종 결과 ----

 

 

---

1. file > new > empty activity > name : Bottom Navigator

2. res > new > android Resource Directory

3. menu > new >  menu Resource file

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

    <item
        android:id="@+id/home"
        android:icon="@drawable/ic_home"
        android:title="Home"
        />

    <item
        android:id="@+id/chatting"
        android:title="Chatting"
        android:icon="@drawable/ic_chat"
        />

    <item
        android:id="@+id/favorite"
        android:title="Favorite"
        android:icon="@drawable/ic_favorite"
        />

    <item
        android:id="@+id/user"
        android:title="User"
        android:icon="@drawable/ic_user"

        />




</menu>

4. @drawable/ic ~~ 추가하는 방법 : drawable > new > Vector Asset > clip art 선택 후 원하는 icon 선택 가능

> name, color, size 등 선택 가능 >>>> next > finish > android:icon="@drawable/(지정 name)"  

 

---

 

5. MainActivity.java

package com.example.bottomnavigatoin; 

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;

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

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

public class MainActivity extends AppCompatActivity {

    BottomNavigationView bottomNavigationView;




    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        bottomNavigationView = findViewById(R.id.btnNav);


        fragementRepl(new HomeFragment());





        bottomNavigationView.setOnItemReselectedListener(new NavigationBarView.OnItemReselectedListener() {
            @Override
            public void onNavigationItemReselected(@NonNull MenuItem item) {

                switch ( item.getItemId()) {
                    case R.id.home:

                        fragementRepl(new HomeFragment());
                    break;

                    case R.id.chatting:

                        fragementRepl(new ChattingFragment());

                        break;

                    case R.id.favorite:

                        fragementRepl(new FavoriteFragment());

                        break;

                    case R.id.user:

                        fragementRepl(new UserFragment());

                        break;



                }


            }
        });
    }

    private void fragementRepl(Fragment fragment) {
        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.replace(R.id.frameLayout,fragment);
        fragmentTransaction.commit();

    }




}

---

6. activity_main.xml

<RelativeLayout 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:layout_width="match_parent"
        android:id="@+id/frameLayout"
        android:layout_above="@+id/btnNav"
        android:layout_alignParentBottom="true"
        android:layout_height="match_parent" />




    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:layout_width="match_parent"
        android:id="@+id/btnNav"
        app:menu="@menu/menu"
        android:layout_alignParentBottom="true"
        android:layout_height="wrap_content"
        />


</RelativeLayout>

activity_main.xml 실행 화면

---

 

7. java > com.example.bottomnavigation > new > fragment > fragment(blank) 

    > HomeFragment , ChattingFragment , FavoriteFragment , UserFragment 동일하게 4개 만들 

package com.example.bottomnavigatoin;

import android.os.Bundle;

import androidx.fragment.app.Fragment;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;


public class HomeFragment extends Fragment {


    public HomeFragment() { // public (해당 Fragment 맞는지 확인, 다르면 바꿔주기)
        // Required empty public constructor
    }


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_home, container, false);
    }
}

^ ex HomeFragment.java (chatting, favorite, user.java 도 동일한 방식으로 만들기)

, @Override 위에 코드 다 지워주기

 

8. layout > new > layout resorce file > fragment_chatting, fragment_home, fragment_favorite, fragment_user.xml 만들기

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".HomeFragment"> // 해당 xml 맞는지 확인


    <TextView
        android:layout_width="match_parent"
        android:text="Home Fragment" // 해당 xml 맞는지 확인 
        android:textSize="18sp"
        android:textStyle="bold"
        android:textColor="#4CAF50" // 옆에 색상 나온거 네모 누르면 다른색으로 변경 가능
        android:gravity="center"
        android:layout_gravity="center"
        android:layout_height="match_parent"
        />



</FrameLayout>

^ ex fragment_home.xml (chatting, favorite, user.xml 도 동일한 방식으로 만들기)

fragment_home.xnl 실행화면