使用带有recycleview的视图模型

这一切都很复杂,我希望我能解释清楚。所以,我使用recycleview以卡片的形式显示用户配置文件列表。每张卡包含2个按钮,用于不同的操作。现在,当点击这些按钮时,需要观察ViewModel中的LiveData对象(我使用的是MVVM、Android架构组件和Kotlin扩展)。一个按钮特别需要根据某些条件观察不同的实时数据。这就是为什么我创建了一个函数,它接受条件并返回合适的结果 OnClickListener 。我把这个交给回收视图适配器。

现在的问题是,我在多个片段中使用了相同的RecyclerView。当我在编写函数的同一片段中使用recycleview时,一切都很正常。在其他地方,我都会遇到以下错误:

java.lang.IllegalStateException: Fragment HomeFragment{1ef5330} (b299012d-c9c2-427f-8387-a7888289701b)} not attached to an activity.
        at androidx.fragment.app.Fragment.requireActivity(Fragment.java:833)
        at 
com.halalrishtey.HomeFragment$$special$$inlined$activityViewModels$2.invoke(FragmentViewModelLazy.kt:80)
        at com.halalrishtey.HomeFragment$$special$$inlined$activityViewModels$2.invoke(Unknown Source:0)
        at androidx.lifecycle.ViewModelLazy.getValue(ViewModelProvider.kt:52)
        at androidx.lifecycle.ViewModelLazy.getValue(ViewModelProvider.kt:41)
        at com.halalrishtey.HomeFragment.getUserVM(Unknown Source:7)
        at com.halalrishtey.HomeFragment.access$getUserVM$p(HomeFragment.kt:25)
        at com.halalrishtey.HomeFragment$genInterestBtnListener$1.onClick(HomeFragment.kt:65)
        at android.view.View.performClick(View.java:7125)
        at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:967)
        at android.view.View.performClickInternal(View.java:7102)
        at android.view.View.access$3500(View.java:801)
        at android.view.View$PerformClick.run(View.java:27336)
        at android.os.Handler.handleCallback(Handler.java:883)
        at android.os.Handler.dispatchMessage(Handler.java:100)
        at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7356)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)

创建OnClickListener的函数看起来像这样:

fun genInterestBtnListener(
        condition: Boolean,
        v: View
    ): View.OnClickListener {
        return View.OnClickListener {
            if (!condition) {
                userVM.initInterest().observe(viewLifecycleOwner, Observer { msg ->
                    Toast.makeText(context, msg, Toast.LENGTH_SHORT)
                        .show()
                    //More code here
                })
            } else {
                userVM.removeInterest().observe(viewLifecycleOwner, Observer { msg ->
                    Toast.makeText(context, msg, Toast.LENGTH_SHORT)
                        .show()
                })
            }
        }
    }

我无法观察适配器内部的情况,那么在不重复代码的情况下,最佳的解决方案是什么??

更新: 我这样声明userVM:

private val userVM: UserViewModel by activityViewModels()

阿尔索 这是我的适配器代码:

class CardDataRVAdapter(private var items: List<ProfileCardData>) :
    RecyclerView.Adapter<CardDataRVAdapter.CardDataViewHolder>() {

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): CardDataViewHolder {
        val inflatedView =
            LayoutInflater.from(parent.context).inflate(R.layout.profile_card, parent, false)
        return CardDataViewHolder(inflatedView)
    }

    override fun onBindViewHolder(holder: CardDataViewHolder, position: Int) {
        val card = items[position]
        holder.bindCard(card)
    }

    override fun getItemCount() = items.size

    class CardDataViewHolder constructor(
        v: View
    ) : RecyclerView.ViewHolder(v), View.OnClickListener {
        private var view: View = v
        private var cardData: ProfileCardData? = null

        init {
            v.setOnClickListener(this)
        }

        override fun onClick(p0: View?) {
            //TODO: Implement a proper onClickListener
            Toast.makeText(
                p0?.context,
                "${p0?.cardTitleTextView?.text} Card was clicked",
                Toast.LENGTH_SHORT
            ).show()
        }


        companion object {
            private val KEY = "CARD"
        }

        fun bindCard(card: ProfileCardData) {
            this.cardData = card

            if (card.isUserShortlisted) {
                view.showInterestBtn.setIconResource(R.drawable.ic_favorite)
            } else {
                view.showInterestBtn.setIconResource(R.drawable.ic_favorite_border)
            }

            if (card.data.photoUrl.length > 5) {
                Picasso.get().load(card.data.photoUrl)
                    .into(view.cardImageView)

                Picasso.get().load(card.data.photoUrl)
                    .into(view.cardAvatarImageView)
            }

            view.cardTitleTextView.text = card.data.displayName
            view.cardSubtitleTextView.text = "${card.data.age} - ${card.data.height}"

            view.showInterestBtn.setOnClickListener(card.showBtnInterestListener)
            view.sendMessageBtn.setOnClickListener(card.messageBtnListener)
        }
    }
}