底部导航栏BottomNavigationView+ViewPager+Fragment

实现效果:

实现方案

1. 主界面xml(包含viewPager和BottomNavigationView)

<RelativeLayout 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="match_parent">

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/bottomNavigationView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        app:itemBackground="@color/colorPrimary"
        app:itemIconTint="@color/bnv_tab_item_foreground"
        app:itemTextColor="@color/bnv_tab_item_foreground"
        app:menu="@menu/bottom_navigation_main" />

    <androidx.viewpager2.widget.ViewPager2
        android:id="@+id/vp"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@id/bottomNavigationView" />
</RelativeLayout>

2. 底部菜单:bottom_navigation_main.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/action_favorites"
        android:enabled="true"
        android:icon="@drawable/ic_favorite_white_24dp"
        android:title="@string/favorites"
        app:showAsAction="ifRoom" />
    <item
        android:id="@+id/action_schedules"
        android:enabled="true"
        android:icon="@drawable/ic_access_time_white_24dp"
        android:title="@string/schedules"
        app:showAsAction="ifRoom" />
    <item
        android:id="@+id/action_music"
        android:enabled="true"
        android:icon="@drawable/ic_audiotrack_white_24dp"
        android:title="@string/mine"
        app:showAsAction="ifRoom" />
</menu>

3. MainActivity

class MainActivity : AppCompatActivity() {

    private val favoritesTabIndex = 0
    private val schedulesTabIndex = 1
    private val mineTabIndex = 2

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val fragments = getFragments()

        vp.adapter = object : FragmentStateAdapter(this) {
            override fun createFragment(position: Int): Fragment {
                return fragments[position]
            }

            override fun getItemCount(): Int {
                return fragments.size
            }
        }
        //禁用左右滑动切换页签
        vp.isUserInputEnabled = false

        bottomNavigationView.setOnNavigationItemSelectedListener { item ->
            when (item.itemId) {
                R.id.action_favorites -> {
                    vp.setCurrentItem(favoritesTabIndex, false)
                }
                R.id.action_schedules -> {
                    vp.setCurrentItem(schedulesTabIndex, false)
                }
                R.id.action_music -> {
                    vp.setCurrentItem(mineTabIndex, false)
                }
            }
            true
        }
    }

    private fun getFragments(): ArrayList<Fragment> {
        val fragments = ArrayList<Fragment>(3)

        val favoritesFragment = BaseFragment()
        var bundle = Bundle()
        bundle.putString("title", getString(R.string.favorites))
        favoritesFragment.arguments = bundle

        val schedulesFragment = BaseFragment()
        bundle = Bundle()
        bundle.putString("title", getString(R.string.schedules))
        schedulesFragment.arguments = bundle

        val mineFragment = BaseFragment()
        bundle = Bundle()
        bundle.putString("title", getString(R.string.mine))
        mineFragment.arguments = bundle

        fragments.add(favoritesFragment)
        fragments.add(schedulesFragment)
        fragments.add(mineFragment)
        return fragments
    }
}

源代码:

https://github.com/cxyzy1/bottomNavigationViewSample.git