4-6-1 바로가기 메뉴 만들기

MainActivity

package com.example.boostcoursepractice;
 
import android.os.Bundle;
 
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.android.material.snackbar.Snackbar;
 
import android.view.View;
 
import androidx.core.view.GravityCompat;
import androidx.appcompat.app.ActionBarDrawerToggle;
 
import android.view.MenuItem;
 
import com.google.android.material.navigation.NavigationView;
 
import androidx.drawerlayout.widget.DrawerLayout;
 
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.fragment.app.Fragment;
 
import android.view.Menu;
import android.widget.FrameLayout;
import android.widget.Toast;
 
public class MainActivity extends AppCompatActivity
        implements NavigationView.OnNavigationItemSelectedListener, FragmentCallback {
 
    Fragment fragment1 ;
    Fragment fragment2;
    Fragment fragment3 ;
    Toolbar toolbar ;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
 
        DrawerLayout drawer = findViewById(R.id.drawer_layout);
        NavigationView navigationView = findViewById(R.id.nav_view);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.addDrawerListener(toggle);
        toggle.syncState();
        navigationView.setNavigationItemSelectedListener(this);
 
        fragment1 = new Fragment1();
        fragment2 = new Fragment2();
        fragment3 = new Fragment3() ;
 
        getSupportFragmentManager().beginTransaction().add(R.id.container, fragment1).commit();
    }
 
    @Override
    public void onFragmentSelected(int position, Bundle bundle) {
        Fragment curFragment = null ;
 
        if(position == 0)
        {
            curFragment = fragment1 ;
            toolbar.setTitle("첫번째 화면");
        }
 
        else if(position == 1)
        {
            curFragment = fragment2 ;
            toolbar.setTitle("두번째 화면");
        }
 
        else if(position == 2)
        {
            curFragment = fragment3 ;
            toolbar.setTitle("세번째 화면");
        }
 
        getSupportFragmentManager().beginTransaction().replace(R.id.container, curFragment).commit();
    }
 
    @Override
    public void onBackPressed() {
        DrawerLayout drawer = findViewById(R.id.drawer_layout);
        if (drawer.isDrawerOpen(GravityCompat.START)) {
            drawer.closeDrawer(GravityCompat.START);
        } else {
            super.onBackPressed();
        }
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
 
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
 
        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }
 
        return super.onOptionsItemSelected(item);
    }
 
    @SuppressWarnings("StatementWithEmptyBody")
    @Override
    public boolean onNavigationItemSelected(MenuItem item) {
        // Handle navigation view item clicks here.
        int id = item.getItemId();
 
        if (id == R.id.nav_0) {
            Toast.makeText(this, "첫번째 화면 선택됨", Toast.LENGTH_SHORT).show();
            onFragmentSelected(0, null);
        } else if (id == R.id.nav_1) {
            Toast.makeText(this, "두번째 화면 선택됨", Toast.LENGTH_SHORT).show();
            onFragmentSelected(1, null);
        } else if (id == R.id.nav_2) {
            Toast.makeText(this, "세번째 화면 선택됨", Toast.LENGTH_SHORT).show();
            onFragmentSelected(2, null);
        }
        DrawerLayout drawer = findViewById(R.id.drawer_layout);
        drawer.closeDrawer(GravityCompat.START);
        return true;
    }
}
 
 
 
 

 

FragmentCallBack

package com.example.boostcoursepractice;
 
import android.os.Bundle;
 
public interface FragmentCallback {
 
    public void onFragmentSelected(int position, Bundle bundle) ;
 
}
 

 

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout 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/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:openDrawer="start">
 
    <androidx.coordinatorlayout.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        tools:context=".MainActivity">
 
        <com.google.android.material.appbar.AppBarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:theme="@style/AppTheme.AppBarOverlay">
 
            <androidx.appcompat.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="?attr/colorPrimary"
                app:popupTheme="@style/AppTheme.PopupOverlay" />
 
        </com.google.android.material.appbar.AppBarLayout>
 
        <FrameLayout
            android:id="@+id/container"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_behavior="@string/appbar_scrolling_view_behavior">
 
 
        </FrameLayout>
 
 
    </androidx.coordinatorlayout.widget.CoordinatorLayout>
 
    <com.google.android.material.navigation.NavigationView
        android:id="@+id/nav_view"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:fitsSystemWindows="true"
        app:headerLayout="@layout/nav_header_main"
        app:menu="@menu/activity_main_drawer" />
 
</androidx.drawerlayout.widget.DrawerLayout>
 

 

nav_header_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="@dimen/nav_header_height"
    android:background="@drawable/side_nav_bar"
    android:gravity="bottom"
    android:orientation="vertical"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:theme="@style/ThemeOverlay.AppCompat.Dark">
 
    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:contentDescription="@string/nav_header_desc"
        android:paddingTop="@dimen/nav_header_vertical_spacing"
        app:srcCompat="@mipmap/ic_launcher_round" />
 
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingTop="@dimen/nav_header_vertical_spacing"
        android:text="@string/nav_header_title"
        android:textAppearance="@style/TextAppearance.AppCompat.Body1" />
 
    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/nav_header_subtitle" />
 
</LinearLayout>
 

 

menu/activity_main_drawer.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    tools:showIn="navigation_view">
 
    <group android:checkableBehavior="single">
        <item
            android:id="@+id/nav_0"
            android:icon="@drawable/ic_menu_camera"
            android:title="첫번째 화면" />
        <item
            android:id="@+id/nav_1"
            android:icon="@drawable/ic_menu_gallery"
            android:title="두번째 화면" />
        <item
            android:id="@+id/nav_2"
            android:icon="@drawable/ic_menu_slideshow"
            android:title="세번째 화면" />
        <item
            android:id="@+id/nav_3"
            android:icon="@drawable/ic_menu_manage"
            android:title="네번째 화면" />
    </group>
 
    <item android:title="Communicate">
        <menu>
            <item
                android:id="@+id/nav_share"
                android:icon="@drawable/ic_menu_share"
                android:title="@string/menu_share" />
            <item
                android:id="@+id/nav_send"
                android:icon="@drawable/ic_menu_send"
                android:title="@string/menu_send" />
        </menu>
    </item>
 
</menu>
 

 

Fragment1

Fragment2

Fragemet3

fragment1.xml

fragment2.xml

fragment3.xml

 

이런 것들은 전글에 있던 것과 아예  같다.

 

 

 

 

우선 바로가기 메뉴를 만들기 위해서는 프로젝트를 생성할 때 Navigation Drawer Activity로 애초에 만드는 것이 편하다. 그러면 여러가지가 생길 텐데 위 예제처럼 app_bar_main.xml, content_main.xml을 activity_main.xml에 합쳐서 한개의 파일로 만드는 것이 편하다. 이제는 저렇게 만들어져 있는 것을 구조를 파악하고 수정하는 것이 중요하다. 위 예제에서는 바로가기 메뉴에 첫번째 두번째 세번째 화면을 클릭하면 해당 프래그먼트를 띄우도록하는 것이다. 

 

 public boolean onNavigationItemSelected(MenuItem item) {

        // Handle navigation view item clicks here.

        int id = item.getItemId();

 

        if (id == R.id.nav_0) {

            Toast.makeText(this, "첫번째 화면 선택됨", Toast.LENGTH_SHORT).show();

            onFragmentSelected(0, null);

        } else if (id == R.id.nav_1) {

            Toast.makeText(this, "두번째 화면 선택됨", Toast.LENGTH_SHORT).show();

            onFragmentSelected(1, null);

        } else if (id == R.id.nav_2) {

            Toast.makeText(this, "세번째 화면 선택됨", Toast.LENGTH_SHORT).show();

            onFragmentSelected(2, null);

        }

        DrawerLayout drawer = findViewById(R.id.drawer_layout);

        drawer.closeDrawer(GravityCompat.START);

        return true;

    }

 

위 처럼 onNavigationItemSelected(MenuItem item)메서드를 오버라이드 해주면 바로가기 메뉴의 어떤 메뉴버튼이 눌렸는지 콜백함수가 작동한다. 버튼이 눌릴 때마다 프래그먼트를 바꿔줘야 하는데 이 때 액티비티의 프래그먼트 매니저를 이용해야 함으로 

 

package com.example.boostcoursepractice;

 

import android.os.Bundle;

 

public interface FragmentCallback {

 

    public void onFragmentSelected(int position, Bundle bundle) ;

 

}

 

위와 같은 FragmentCallback이라는 인터페이스를 만들고 이를 메인 액티비티에서 인터페이스를 implement해준다. 그리고 인터페이스에서 선언된 함수를 

 

@Override

    public void onFragmentSelected(int position, Bundle bundle) {

        Fragment curFragment = null ;

 

        if(position == 0)

        {

            curFragment = fragment1 ;

            toolbar.setTitle("첫번째 화면");

        }

 

        else if(position == 1)

        {

            curFragment = fragment2 ;

            toolbar.setTitle("두번째 화면");

        }

 

        else if(position == 2)

        {

            curFragment = fragment3 ;

            toolbar.setTitle("세번째 화면");

        }

 

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

    }

 

위와 같이 오버라이드 해주고 프래그먼트를 바꿔줄 때마다 위 함수를 호출하면 된다.

 

 

 

 

 

 

 

결과화면1

 

결과화면2