Fragment 仅附加在第一个 Holder 中，而不是 In All Holder RecyclerView

Question

我想问一下，为什么我的持有人在recyclerview中只显示了第一个FragmentContainerView(fragment child)，而第二个和其余的没有显示。

有没有我遗漏的代码？还是我应该采取其他方法？

这是我的适配器。

 class CertificateAdapter constructor(
        fragmentManager: FragmentManager,
        val onClick: (Certificate) -> Unit
    ) :
        RecyclerView.Adapter<CertificateAdapter.ItemHolder>() {

        private var listCertificate = arrayListOf<Certificate>()

        private var mManager = fragmentManager

        override fun onCreateViewHolder(
            parent: ViewGroup,
            viewType: Int
        ): CertificateAdapter.ItemHolder {
            return ItemHolder(
                V3ViewSubCertificateBinding.inflate(
                    LayoutInflater.from(parent.context),
                    parent,
                    false
                )
            )
        }

        override fun onBindViewHolder(holder: ItemHolder, position: Int) =
            holder.bind(listCertificate[position])

        override fun getItemCount() = listCertificate.size

        inner class ItemHolder(
            private val binding: V3ViewSubCertificateBinding,
        ) :
            RecyclerView.ViewHolder(binding.root),
            TextViewBindingAdapter.AfterTextChanged,
            UploadPhotoListener {
            private var cert = Certificate()

            fun bind(certificate: Certificate) {
                val mFragmentManager = mManager
                cert = certificate

                with(binding) {
                    holder = this@ItemHolder
                    imageClose.setOnSafeClickListener {
                        deleteItem(certificate)
                    }
                    itemNumber = (bindingAdapterPosition + 1).toString()

                    (mFragmentManager
                        .findFragmentById(R.id.fg_upload_certificate) as? 
NewUploadFragment)?.apply {
                        setTitle(getString(R.string.upload_info_training_certification))
                        setImageViewType(ImageType.TRAINING_CERTIFICATE)
                        setUploadPhotoListener(this@ItemHolder)
                    }
                }
            }

            override fun afterTextChanged(s: Editable?) {
                when (s.hashCode()) {
                    binding.formTrainingName.inputLayout.code() -> {
                        //handle ET1 text change
                    }
                    binding.formYear.inputLayout.code() -> {
                        //handle ET2 text change
                    }
                }
            }

            override fun setUploadPhotoResult(imageViewType: ImageType?, imageUrl: String?) {
                //handle photo upload result
            }
        }

        fun addItem(certificate: Certificate) {
            listCertificate.add(certificate)
            notifyItemInserted(this.listCertificate.size)
        }

        fun deleteItem(certificate: Certificate) {
            listCertificate.remove(certificate)
            notifyItemRemoved(this.listCertificate.size)
            if (listCertificate.size == Constant.ZERO) {
                clearItem()
            }
        }

        fun clearItem() {
            listCertificate = arrayListOf()
            notifyDataSetChanged()
        }
    }

我的 ItemXML，在持有人 Recyclerview 中使用

<?xml version="1.0" encoding="utf-8"?>
<layout 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">

    <data>
        <variable
            name="certificate"
            type="Certificate" />

        <variable
            name="itemNumber"
            type="String" />

        <variable
            name="holder"
            type="CertificateAdapter.ItemHolder" />
    </data>

    <com.google.android.material.card.MaterialCardView
        style="@style/CardView.0"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:cardUseCompatPadding="true">

        <LinearLayout style="@style/Layout.Vertical">

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

            <EditText 1/>

            <EditText 2/>

            <androidx.fragment.app.FragmentContainerView
                android:id="@+id/fg_upload_certificate"
                android:name="v2.upload.NewUploadFragment"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginHorizontal="@dimen/_16dp"
                android:layout_marginVertical="@dimen/_16dp"
                tools:layout="@layout/fragment_new_upload_photo" />
        </LinearLayout>
    </com.google.android.material.card.MaterialCardView>
</layout>

我的父片段 从父母那里我有权删除和添加项目到我的适配器。

class AmbassadorExperienceFragment : BaseFragment {
    private val mBinding by bindingDelegates {
        V3FragmentAmbassadorExperienceBinding.bind(
            requireView()
        )
    }

    private val mAdapter: CertificateAdapter by lazy {
        CertificateAdapter(
            onClick =
            { certificate ->
                mAdapter.deleteItem(certificate)
            },
            fragmentManager = this@AmbassadorExperienceFragment.childFragmentManager
        )
    }

    override fun getLayout() = R.layout.v3_fragment_ambassador_experience

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
      
    }
    
        private val onClickProcess: (View) -> Unit = { view ->
            when (view) {
                mBinding.buttonAddCertification -> {
                    mAdapter.addItem(Certificate())
                }
            }
        }
    }

Answer 1

今天也在找同样的东西，找到了答案here

所以从我的理解来看，答案是你不应该这样做，而是使用多个 Viewholders。