[英]How to update view inside the viewpager2 that attach to fragment on fragment onResume?
[英]How to access ViewPager2 from a page fragment using View binding?
如何在 ViewPager2 中使用視圖綁定? 參考我的代碼
我正在開發帶有視圖 pager2 的應用程序介紹屏幕,其中包含多個片段。
我在主布局中有一個 ViewPager2 並且我想在我的子片段中膨脹視圖尋呼機的 id。
ViewPagerFragment.kt
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.fragment.app.Fragment
import com.test.zigmaster.databinding.FragmentViewPagerBinding
class ViewPagerFragment : Fragment() {
var binding : FragmentViewPagerBinding?= null
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View {
// Inflate the layout for this fragment
// val view = inflater.inflate(R.layout.fragment_view_pager, container, false)
binding = FragmentViewPagerBinding.inflate(inflater)
val fragmentList = arrayListOf<Fragment>(
FirstScreen(),
SecondScreen(),
ThirdScreen()
)
val adapter = ViewPagerAdapter(
fragmentList,
requireActivity().supportFragmentManager,
lifecycle
)
binding!!.viewPager.adapter = adapter
return binding!!.root
}
override fun onDestroyView() {
super.onDestroyView()
binding=null
}
}
ViewPagerAdapter.kt
import androidx.fragment.app.Fragment
import androidx.fragment.app.FragmentManager
import androidx.lifecycle.Lifecycle
import androidx.viewpager2.adapter.FragmentStateAdapter
class ViewPagerAdapter(
list: ArrayList<Fragment>,
fm: FragmentManager,
lifecycle: Lifecycle
) : FragmentStateAdapter(fm, lifecycle) {
private val fragmentList = list
override fun getItemCount(): Int {
return fragmentList.size
}
override fun createFragment(position: Int): Fragment {
return fragmentList[position]
}
}
fragment_view_pager.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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.app_intro.ViewPagerFragment">
<androidx.viewpager2.widget.ViewPager2
android:id="@+id/viewPager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
這是第一個片段:我想膨脹視圖尋呼機 id FirstScreen.kt
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.fragment.app.Fragment
import androidx.viewpager2.widget.ViewPager2
import com.test.zigmaster.R
import com.test.zigmaster.databinding.FragmentFirstScreenBinding
class FirstScreen : Fragment() {
private var binding : FragmentFirstScreenBinding?= null
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View {
// Inflate the layout for this fragment
binding = FragmentFirstScreenBinding.inflate(inflater)
val viewPager = activity?.findViewById<ViewPager2>(R.id.viewPager)
binding!!.next.setOnClickListener {
viewPager?.currentItem = 1
}
return binding!!.root
}
override fun onDestroyView() {
super.onDestroyView()
binding=null
}
}
您可以在托管ViewPager
的片段中創建一個 getter 方法:
fun getViewPager: ViewPager2 = binding!!.viewPager
並使用getParentFragment()
在頁面片段中調用它:
val viewPager = (requireParentFragment() as ViewPagerFragment).getViewPager()
注意:如果ViewPager
由 Activity 托管,則可以使用requireActivity()
而不是requireParentFragment()
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