How to use TabLayout with ViewPager2 in Android

问题

I want to use com.google.android.material.tabs.TabLayout component with Android's new ViewPager implementation androidx.viewpager2.widget.ViewPager2. However, the setupWithViewPager(..) method provided by TabLayout supports only the old ViewPager implementation. Is there a way to bind a TabLayout to a ViewPager2 component easily?

回答1:

You have to use this TabLayoutMediator that mimics tabLayout.setupWithViewPager() and sets up the ViewPager2 with Tablayout. Otherwise you will have to write your own adapter that will combine both parties.

It's code will look like this in kotlin

TabLayoutMediator(tabLayout, viewPager) { tab, position ->
            tab.text = tabTitles[position]
        }.attach()

回答2:

Initialize the TabLayoutMediator object with an object of TabLayout, ViewPager2 , autoRefresh -- boolean type, and an object of OnConfigurationChangeCallback.

TabLayoutMediator tabLayoutMediator = new TabLayoutMediator(tabLayout, viewPager2, true, new TabLayoutMediator.OnConfigureTabCallback() {
     @Override
     public void onConfigureTab(@NotNull TabLayout.Tab tab, int position) {
          // position of the current tab and that tab  
     }
});

Finally just call attach() to the TabLayoutMediator object to wire up the tablayout to the viewpager :-

 tabLayoutMediator.attach();

autoRefresh - key if set to true -- ( By default its set to true )

RECREATES all the tabs of the tabLayout if notifyDataSetChanged is called to the viewpager adapter.

Use the contents of TabLayoutMediator.java

回答3:

UPDATE

check this Create swipe views with tabs using ViewPager2

Here is the Updated answer How to use TabLayout with ViewPager2 in Android

Now we no need to create a class from TabLayoutMediator

Use below dependencies

implementation 'com.google.android.material:material:1.1.0-alpha08'
implementation 'androidx.viewpager2:viewpager2:1.0.0-beta02'

SAMPLE CODE

XMl layout

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout
        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">

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

        <androidx.appcompat.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="?attr/colorPrimary"
                app:layout_scrollFlags="scroll|enterAlways"
                app:popupTheme="@style/ThemeOverlay.AppCompat.Light"/>

        <com.google.android.material.tabs.TabLayout
                android:id="@+id/tabs"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"/>
    </com.google.android.material.appbar.AppBarLayout>

    <androidx.viewpager2.widget.ViewPager2
            android:id="@+id/viewpager"
            app:layout_anchor="@id/tabs"
            app:layout_anchorGravity="bottom"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
    />


</androidx.coordinatorlayout.widget.CoordinatorLayout>

Activity

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import kotlinx.android.synthetic.main.activity_main.*
import com.google.android.material.tabs.TabLayoutMediator

import com.google.android.material.tabs.TabLayout


class MainActivity : AppCompatActivity() {

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

//        setSupportActionBar(toolbar)
        viewpager.adapter = AppViewPagerAdapter(supportFragmentManager, lifecycle)

        TabLayoutMediator(tabs, viewpager, object : TabLayoutMediator.OnConfigureTabCallback {
            override fun onConfigureTab(tab: TabLayout.Tab, position: Int) {
                // Styling each tab here
                tab.text = "Tab $position"
            }
        }).attach()


    }
}

UPDATE

If your using implementation 'com.google.android.material:material:1.1.0-alpha10' then use below code

        TabLayoutMediator(tabs, viewpage,
        TabLayoutMediator.TabConfigurationStrategy { tab, position ->
            when (position) {
                0 -> { tab.text = "TAB ONE"}
                1 -> { tab.text = "TAB TWO"}
            }
        }).attach()

OUTPUT

回答4:

You can use Kotlin extension function:

fun TabLayout.setupWithViewPager(viewPager: ViewPager2, labels: List<String>) {

    if (labels.size != viewPager.adapter?.itemCount)
        throw Exception("The size of list and the tab count should be equal!")

    TabLayoutMediator(this, viewPager,
        TabLayoutMediator.TabConfigurationStrategy { tab, position ->
            tab.text = labels[position]
        }).attach()
}

And call it:

 tabLayout.setupWithViewPager(viewPager, listOf("Tab A", "Tab B"))

来源：https://stackoverflow.com/questions/55372259/how-to-use-tablayout-with-viewpager2-in-android