안드로이드 이론 빡공 14

**menu_botton.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">

    <!-- app:showAsAction="ifRoom" 공간이 있으면 보여줘라 의미

    -->
        <item
            android:id="@+id/tab1"
            app:showAsAction="ifRoom"
            android:enabled="true"
            android:icon="@android:drawable/ic_dialog_email"
            android:title="이메일"
            />
    <item
        android:id="@+id/tab2"
        app:showAsAction="ifRoom"
        android:enabled="true"
        android:icon="@android:drawable/ic_dialog_info"
        android:title="정보"
        />
    <item
        android:id="@+id/tab3"
        app:showAsAction="ifRoom"
        android:enabled="true"
        android:icon="@android:drawable/ic_dialog_map"
        android:title="위치"
        />

</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=".MainActivity">



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

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/bottom_navigation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="@+id/container"
        app:layout_constraintStart_toStartOf="parent"
        app:itemBackground="@color/colorPrimary"
        app:itemIconTint="@drawable/item_color"
        app:itemTextColor="@drawable/item_color"
        app:menu="@menu/menu_botton"
        />

</androidx.constraintlayout.widget.ConstraintLayout>

**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"/>

    <!--여기서 state_cheked 선택된 상태이면 위에 색
    아니면 아래색을 보여달라라는 뜻-->
</selector>

**MainActivity.java **

package com.threedpit.mytab2;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

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

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

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();

        //위와같이 일단 선언을 해주고 아래 와같이 우선 프래그먼트1화면 먼저 보여주게 설정
        getSupportFragmentManager().beginTransaction().replace(R.id.container,fragment1).commit();

        //아이템이 선택 되었을때 가 이 메소드가 실행되는 시점
        BottomNavigationView bottomNavigationView = findViewById(R.id.bottom_navigation);
        bottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                switch (item.getItemId()){
                    case R.id.tab1:
                        getSupportFragmentManager().beginTransaction().replace(R.id.container,fragment1).commit();
                        return true;
                    case R.id.tab2:
                        getSupportFragmentManager().beginTransaction().replace(R.id.container,fragment2).commit();
                        return true;
                    case R.id.tab3:
                        getSupportFragmentManager().beginTransaction().replace(R.id.container,fragment3).commit();
                        return true;
                }
                return false;
            }
        });


    }
}