Android 앱바, 탭, 플로팅 버튼, 네비게이션 통합

<?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"
    android:id="@+id/drawer"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.coordinatorlayout.widget.CoordinatorLayout
        android:id="@+id/main_content"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <com.google.android.material.appbar.AppBarLayout
            android:id="@+id/appbar"
            android:layout_width="match_parent"
            android:layout_height="242dp"
            android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

            <com.google.android.material.appbar.CollapsingToolbarLayout
                android:layout_width="match_parent"
                android:layout_height="242dp"
                app:contentScrim="?attr/colorPrimary"
                app:expandedTitleMarginBottom="50dp"
                app:expandedTitleMarginStart="48dp"
                app:layout_scrollFlags="scroll|exitUntilCollapsed"
                app:title="AppBar Title">

                <ImageView
                    android:id="@+id/backdrop"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:scaleType="centerCrop"
                    app:layout_collapseMode="parallax"
                    android:src="@drawable/baseball"/>

                <androidx.appcompat.widget.Toolbar
                    android:id="@+id/toolbar"
                    android:layout_width="match_parent"
                    android:layout_height="?attr/actionBarSize"
                    app:layout_collapseMode="pin"
                    />

                <com.google.android.material.tabs.TabLayout
                    android:id="@+id/tabs"
                    android:layout_width="match_parent"
                    android:layout_height="50dp"
                    android:layout_gravity="bottom"
                    app:layout_collapseMode="parallax"
                    app:tabMode="scrollable"
                    android:background="#00000000"
                    app:tabTextColor="#FFFFFF"/>

            </com.google.android.material.appbar.CollapsingToolbarLayout>
        </com.google.android.material.appbar.AppBarLayout>

        <androidx.viewpager2.widget.ViewPager2
            android:id="@+id/viewpager"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_behavior="@string/appbar_scrolling_view_behavior" />

        <com.google.android.material.floatingactionbutton.ExtendedFloatingActionButton
            android:id="@+id/fab"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            app:icon="@android:drawable/ic_input_add"
            android:text="Extended FAB"
            app:layout_anchor="@id/viewpager"
            app:layout_anchorGravity="bottom|right" />
    </androidx.coordinatorlayout.widget.CoordinatorLayout>

    <com.google.android.material.navigation.NavigationView
        android:id="@+id/main_drawer_view"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        app:headerLayout="@layout/navigation_header"
        app:menu="@menu/menu_navigation" />
</androidx.drawerlayout.widget.DrawerLayout>

class MainActivity : AppCompatActivity() {

    lateinit var toggle: ActionBarDrawerToggle

    class MyFragmentPagerAdapter(activity: FragmentActivity): FragmentStateAdapter(activity){
        val fragments: List<Fragment>
        init {
            fragments= listOf(OneFragment(), TwoFragment(), ThreeFragment())
        }
        override fun getItemCount(): Int = fragments.size

        override fun createFragment(position: Int): Fragment = fragments[position]
    }

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

        setSupportActionBar(binding.toolbar)

        toggle = ActionBarDrawerToggle(this, binding.drawer, R.string.drawer_opened, R.string.drawer_closed)
        supportActionBar?.setDisplayHomeAsUpEnabled(true)
        toggle.syncState()

        val adapter=MyFragmentPagerAdapter(this)
        binding.viewpager.adapter = adapter

        TabLayoutMediator(binding.tabs, binding.viewpager) { tab, position ->
            tab.text = "Tab${(position + 1)}"
        }.attach()
    }

    override fun onCreateOptionsMenu(menu: Menu?): Boolean {
        menuInflater.inflate(R.menu.menu_main, menu)
        return super.onCreateOptionsMenu(menu)
    }

    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        if(toggle.onOptionsItemSelected(item)){
            return true
        }
        return super.onOptionsItemSelected(item)
    }
}