我使用导航架构组件 - 一个活动多片段样式。在 ProfileEditHolderFragment 中，我想使用最新的 ViewPager2 和 FragmentStateAdapter 以可交换的方式显示片段列表。我像下面这样实现它。
ProfileEditHolderFragment.kt
class ProfileEditHolderFragment : BaseFragment() {
override fun getLayoutResId() = R.layout.fragment_profile_edit_holder
override fun initWidget() {
profile_state_progress_bar.setStateDescriptionData(arrayOf("Tuition", "Education", "Personal", "Credential", "Quiz"))
val listOfFragment = listOf<Fragment>(TuitionInfoFragment(), EditEducationFragment())
profile_edit_view_pager.adapter = activity?.let {
TutorProfileEditAdapter(it, listOfFragment)
}
}
}
fragment_profile_edit_holder.xml
<androidx.core.widget.NestedScrollView
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"
tools:context=".ui.fragment.tutorPanel.profileEdit.ProfileEditHolderFragment">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<another view>
<androidx.viewpager2.widget.ViewPager2
android:id="@+id/profile_edit_view_pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="@dimen/_20sdp"
android:orientation="horizontal"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/profile_state_progress_bar"
app:layout_constraintBottom_toBottomOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.core.widget.NestedScrollView>
TutorProfileEditAdapter.kt
class TutorProfileEditAdapter(
activity: FragmentActivity,
private val fragmentList: List<Fragment>
): FragmentStateAdapter(activity) {
override fun getItemCount() = fragmentList.size
override fun createFragment(position: Int) = fragmentList[position]
}
但问题是 ViewPager2 持有者中没有显示任何片段。