如何正确实现带有recyclerview的searchview？

问题描述

我已经用recyclerView实现了searchView，它无法正常工作，并且出现错误，我不明白自己在哪里犯错误。我实现了searchview逻辑的MainActivity下面

我已经用recyclerView实现了searchView，它无法正常工作，并且出现错误，我不明白自己在哪里犯错误。我实现了searchview逻辑的MainActivity下面

 class MemberActivity : AppCompatActivity() {
    
        private var memberAdapter: MemberAdapter? = null
        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            setContentView(R.layout.activity_member)
    
    
            val compositedisposable = Compositedisposable()
            compositedisposable.add(
                ServiceBuilder.buildService(SpectrumInterface::class.java)
                    .getMembers()
                    .toObservable()
                    .flatMap { Observable.fromIterable(it) }
                    .flatMap { Observable.fromIterable(it.members) }
                    .toList()
                    .subscribeOn(Schedulers.io())
                    .observeOn(AndroidSchedulers.mainThread())
                    .subscribe(
                        { members -> onResponse(members) },{ t -> onFailure(t) })
            )
    
    
    
            memberAdapter = MemberAdapter()
            recyclerView.setHasFixedSize(true)
            recyclerView.layoutManager = linearlayoutmanager(this)
            recyclerView.addItemdecoration(DividerItemdecoration(this,LinearLayout.VERTICAL))
    
    
            private fun onFailure(t: Throwable) {
                Toast.makeText(this,t.message,Toast.LENGTH_SHORT).show()
            }
    
            private fun onResponse(members: List<Member>) {
                progressBar.visibility = View.GONE
                (recyclerView.adapter as MemberAdapter).setMembers(members)
            }
    
    
            override fun onQueryTextSubmit(query: String?): Boolean {
                return false
            }
    
            override fun onQueryTextChange(newText: String?): Boolean {
                memberAdapter?.getFilter()?.filter(newText)
    
                return true
            }
    
    
            ascendingButton.setonClickListener
            {
                memberAdapter?.sortAscending()
            }
    
            descendingButton.setonClickListener {
                memberAdapter?.sortDescending()
            }
    
        }
    
    
    
    }

在实现了过滤器逻辑的适配器下面

class MemberAdapter : RecyclerView.Adapter<MemberAdapter.MemberViewHolder>() {
    private val members = mutablelistof<Member>()

    fun setMembers(data: List<Member>) {
        members.clear()
        members.addAll(data)
        notifyDataSetChanged()
    }

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

    override fun getItemCount() = members.size




    fun sortAscending() {
        members.sortBy { it.age }
        notifyDataSetChanged()
    }

    fun sortDescending() {
        members.sortByDescending { it.age }
        notifyDataSetChanged()
    }

    fun getFilter(): Filter {
        return object : Filter() {
            override fun performFiltering(charSequence: CharSequence): FilterResults {
                val query = charSequence.toString()

                val filtered: MutableList<Member> = ArrayList()

                if (query.isEmpty()) {
                    filtered.clear()
                    filtered.addAll(members)
                } else {
                    filtered.addAll(members.filter {
                        it.id.toLowerCase(Locale.ROOT)
                            .contains(query.toLowerCase(Locale.ROOT)) || it.age.toString()
                            .contains(query)
                    })
                }

                val results = FilterResults()
                results.count = filtered.size
                results.values = filtered
                return results
            }

            override fun publishResults(charSequence: CharSequence,results: FilterResults) {
                members.clear()
                members.addAll(results.values as Collection<Member>)

                notifyDataSetChanged()
            }
        }
    }
    override fun onBindViewHolder(holder: MemberViewHolder,position: Int) {
        return holder.bind(members[position])
    }

    class MemberViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {

        private val memberAge: TextView = itemView.findViewById(R.id.memberAge)

        //   private val memberName: TextView = itemView.findViewById(R.id.memberName)
        private val lastName: TextView = itemView.findViewById(R.id.lastName)
        private val firstName: TextView = itemView.findViewById(R.id.firstName)
        private val emailAddress: TextView = itemView.findViewById(R.id.emailAddress)
        private val phone: TextView = itemView.findViewById(R.id.phone)

        fun bind(member: Member) {
            memberAge.text = member.age.toString()
            lastName.text = member.name?.last
            firstName.text = member.name?.first
            emailAddress.text = member.email
            phone.text = member.phone
        }
    }

}

解决方法

您的错误是更新members，然后再次将其用作将来过滤的基础。

相反：

在filteredMembers中创建另一个列表MembersAdapter，将其初始化为等于setMembers()中的成员

使MembersAdapter反映filteredMembers中的项目

1. override fun getItemCount() = filteredMembers.size

    override fun onBindViewHolder(holder: MemberViewHolder,position: Int) {
        return holder.bind(filteredMembers[position])
    }

进行过滤器更新filteredMembers而不是members