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Since API 27
FragmentPagerAdapter
is deprecated. What's the best alternative to use for this?
In my case, I understand something like
super(fragmentManager, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT)
would need to be used, but I don't know where within my code this needs to go.
I got these imports in my class:
import androidx.fragment.app.FragmentManager
import androidx.fragment.app.FragmentPagerAdapter
but FragmentPagerAdapter in class MyViewPagerAdapter(manager: FragmentManager) : FragmentPagerAdapter(manager){ is crossed out.
class MyViewPagerAdapter(manager: FragmentManager) : FragmentPagerAdapter(manager){
private val fragmentList : MutableList<androidx.fragment.app.Fragment> = ArrayList()
private val titleList : MutableList<String> = ArrayList()
override fun getItem(position: Int): androidx.fragment.app.Fragment {
return fragmentList[position]
override fun getCount(): Int {
return fragmentList.size
fun addFragment(fragment: androidx.fragment.app.Fragment, title: String){
fragmentList.add(fragment)
titleList.add(title)
override fun getPageTitle(position: Int): CharSequence? {
return titleList[position]
UPDATE 2021-06-14: At this point, ViewPager itself is all but deprecated. Technically, ViewPager is not deprecated, but the two concrete PagerAdapter implementations — FragmentPagerAdapter and FragmentStatePagerAdapter — are deprecated. Ideally, switch to something else, such as ViewPager2 or the pager composable in Accompanist.
Replace:
class MyViewPagerAdapter(manager: FragmentManager) : FragmentPagerAdapter(manager)
with:
class MyViewPagerAdapter(manager: FragmentManager) : FragmentPagerAdapter(manager, FragmentPagerAdapter.BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT)
(assuming that MyViewPagerAdapter does not need this value to be configurable)
–
–
–
–
–
Switch to ViewPager2 with FragmentStateAdapter.
Here is the XML view:-
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.google.android.material.tabs.TabLayout
android:id="@+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<androidx.viewpager2.widget.ViewPager2
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
</LinearLayout>
class AdapterTabPager(activity: FragmentActivity?) : FragmentStateAdapter(activity!!) {
private val mFragmentList: MutableList<Fragment> = ArrayList()
private val mFragmentTitleList: MutableList<String> = ArrayList()
public fun getTabTitle(position : Int): String{
return mFragmentTitleList[position]
fun addFragment(fragment: Fragment, title: String) {
mFragmentList.add(fragment)
mFragmentTitleList.add(title)
override fun getItemCount(): Int {
return mFragmentList.size
override fun createFragment(position: Int): Fragment {
return mFragmentList[position]
Here is the way to instantiate ViewPager:-
val adapter = AdapterTabPager(activity)
adapter.addFragment(categoryFragment, "Category")
adapter.addFragment(brandFragment, "Brand")
rootView.viewpager.adapter = adapter
rootView.viewpager.currentItem = 0
TabLayoutMediator(rootView.tabs, rootView.viewpager) { tab, position ->
tab.text = adapter.getTabTitle(position)
}.attach()
–
–
It seems like not only the constructor without behavior, but the class FragmentPagerAdapter (which can consume a good amount of memory by keeping Fragments in memory), and FragmentStatePagerAdapter are both in deprecation stage.
I wonder what can be used to extend abstract class PagerAdapter to extend codebase lifespan.
If you used this path New > Activities > Tabbed Activity so you need some changes:
1- XML
before
<androidx.viewpager.widget.ViewPager
android:id="@+id/view_pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:contentDescription="@string/pages"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
after
<androidx.viewpager2.widget.ViewPager2
android:id="@+id/view_pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:contentDescription="@string/pages"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
2- New Adapter
As @Bharat Lalwani wrote below:
import androidx.fragment.app.Fragment
import androidx.fragment.app.FragmentActivity
import androidx.viewpager2.adapter.FragmentStateAdapter
class ScreenSlidePagerAdapter(activity: FragmentActivity?) : FragmentStateAdapter(activity!!) {
private val mFragmentList: MutableList<Fragment> = ArrayList()
private val mFragmentTitleList: MutableList<String> = ArrayList()
fun getTabTitle(position : Int): String{
return mFragmentTitleList[position]
fun addFragment(fragment: Fragment, title: String) {
mFragmentList.add(fragment)
mFragmentTitleList.add(title)
override fun getItemCount(): Int {
return mFragmentList.size
override fun createFragment(position: Int): Fragment {
return mFragmentList[position]
3- Main Activity
before
val sectionsPagerAdapter = SectionsPagerAdapter(this, supportFragmentManager)
val viewPager: ViewPager = binding.viewPager
viewPager.adapter = sectionsPagerAdapter
val tabs: TabLayout = binding.tabs
tabs.setupWithViewPager(viewPager)
after
val adapter = ScreenSlidePagerAdapter(this)
adapter.addFragment( PlaceholderFragment.newInstance( 1),"Brand")
adapter.addFragment( PlaceholderFragment.newInstance( 2),"Brand2")
val viewPager: ViewPager2 = binding.viewPager
viewPager.adapter = adapter
viewPager.currentItem = 0
val tabs: TabLayout = binding.tabs
TabLayoutMediator(tabs, viewPager) { tab, position ->
tab.text = adapter.getTabTitle(position)
}.attach()
4- Then you can delete SectionsPagerAdapter class
You can use FragmentStateAdapter(fragment)
class YourViewPagerAdapter(fragment: Fragment, val mFragmentList: Array<String>, val viewPager: ViewPager2) : FragmentStateAdapter(fragment){
override fun getItemCount(): Int {
return mFragmentList.size
override fun createFragment(position: Int): Fragment {
when(position){
0 -> return YourFirstTabFragment()
1 -> return YourSecondTabFragment()
2 -> return YourThirdTabFragment()
return YourFirstTabFragment()
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