java - 如何将适配器传递给android中的模型类

Question

在我的应用程序中，我想 在. 为了在滚动项目时不重置计时器，我将CountDown计时器写入模型类。recyclerview
recyclerview

为此，我应该调用notifyItemChanged模型类。
但我不知道如何将适配器发送到模型类！

我的模特班：

data class Today(
    @SerializedName("auction_status")
    val auctionStatus: String = "", // accept
    @SerializedName("base_price")
    val basePrice: Int = 0, // 48000
    @SerializedName("bid_number")
    val bidNumber: String = "", // 1
    @SerializedName("calculate_end")
    val calculateEnd: Long = 0, // -4458
    @SerializedName("can_offer_before")
    val canOfferBefore: Int = 0, // 1
    @SerializedName("capacity")
    val capacity: Int = 0, // 15
    @SerializedName("current_price")
    val currentPrice: Int = 0, // 112000
    @SerializedName("discount")
    val discount: Int = 0, // 160000
    @SerializedName("end")

    var countDownTimer: CountDownTimer? = null,
    var currentVal: String

) {
    init {
        countDownTimer = object : CountDownTimer(calculateEnd * 1000, 1000) {
            override fun onTick(millisUntilFinished: Long) {
                var seconds = (millisUntilFinished / 1000).toInt()
                val hours = seconds / (60 * 60)
                val tempMint = seconds - hours * 60 * 60
                val minutes = tempMint / 60
                seconds = tempMint - minutes * 60
                currentVal =
                    String.format("%02d", hours) + ":" + String.format(
                        "%02d",
                        minutes
                    ) + ":" + String.format("%02d", seconds)
                // call adapter.notifyItemChanged(..) here
            }

            override fun onFinish() {
                //here  you should call the adapter.notifyItemChanged(..) function with the position of this model in the model list
            }
        }.start()
    }
}

适配器代码：

class AuctionsTodayAdapter(val context: Context, val model: MutableList<Today>) :
    RecyclerView.Adapter<AuctionsTodayAdapter.MyHolder>() {

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyHolder {
        val view = LayoutInflater.from(context).inflate(R.layout.row_main_list, parent, false)
        val holder = MyHolder(view)

        //holder.setIsRecyclable(false)

        return holder
    }

    override fun getItemCount(): Int {
        return model.size
    }

    override fun onBindViewHolder(holder: MyHolder, position: Int) {

    }

override fun onViewAttachedToWindow(holder: MyHolder) {
    var position = holder.adapterPosition
    val modelUse = model[position]
    holder.setData(modelUse)
}

override fun onViewDetachedFromWindow(holder: MyHolder) {
    if (holder.countTimer != null) {
        holder.countTimer.cancel()
    }
}

    inner class MyHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {

        var newCountDownTimer: CountDownTimer? = null

        lateinit var rowMain_timer: TextView

        init {
            rowMain_timer = itemView.findViewById(R.id.rowMain_timer)
        }

        fun setData(model: Today) {
            model.image.let {
                Glide.with(context)
                    .load(Constants.MAIN_BASE_URL + it)
                    .apply(RequestOptions.diskCacheStrategyOf(DiskCacheStrategy.RESOURCE))
                    .into(itemView.rowMain_img)
            }
            model.title.let { itemView.rowMain_title.text = it }
        }
}

活动代码：

class MainActivity : AppCompatActivity() {

    private lateinit var apisList: ApisList
    private lateinit var retrofit: Retrofit
    private lateinit var todayAdapter: AuctionsTodayAdapter
    private val todayModel: MutableList<Today> = mutableListOf()
    private lateinit var layoutManager: RecyclerView.LayoutManager

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        //Initialize
        retrofit = ApiClient.instance
        apisList = retrofit.create(ApisList::class.java)
        todayAdapter = AuctionsTodayAdapter(themedContext, todayModel)
        layoutManager = LinearLayoutManager(themedContext)
        //RecyclerView
        main_list.setHasFixedSize(true)
        main_list.layoutManager = layoutManager
        main_list.adapter = todayAdapter

        if (isNetworkAvailable()) getData(1, 10)
    }

    private fun getData(page: Int, limit: Int) {
        main_loader.visibility = View.VISIBLE
        val call = apisList.getAuctionsToday(page, limit)
        call.let {
            it.enqueue(object : Callback<AuctionsTodayResponse> {
                override fun onFailure(call: Call<AuctionsTodayResponse>, t: Throwable) {
                    main_loader.visibility = View.GONE
                    Log.e("auctionsTodayList", t.message)
                }

                override fun onResponse(call: Call<AuctionsTodayResponse>, response: Response<AuctionsTodayResponse>) {
                    if (response.isSuccessful) {
                        response.body()?.let { itBody ->
                            main_loader.visibility = View.GONE
                            if (itBody.toString().isNotEmpty()) {
                                todayModel.clear()
                                todayModel.addAll(itBody.res.today)
                                todayAdapter.notifyDataSetChanged()
                            }
                        }
                    }
                }
            })
        }
    }
}

我该怎么办？

标签： javaandroidkotlinandroid-recyclerview

Answer 1

从 onResponse(..) 调用此方法

  fun recyclerScroll(){

 recyclerView.addOnScrollListener(object : RecyclerView.OnScrollListener() {
                    override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
                        super.onScrolled(recyclerView, dx, dy)

                        if (dy > 0) {

                           // recyclerview is scrolling up
                          // your code for  cancel timer

                        } else if(layoutManager.findFirstCompletelyVisibleItemPosition() == 0){

                            // recyclerview is not scrolling 
                          // start timer

                        }
                     else{
                         // recyclerview is scrolling down
                          // your code for cancel timer
                        }

                    }

                    override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
                        super.onScrollStateChanged(recyclerView, newState)
                        mSwipeRefreshLayout.isEnabled = gridLayoutManager.findFirstCompletelyVisibleItemPosition() == 0
                    }

                })

 }

并从适配器调用它

(context as Your_Activity_Name).recyclerScroll()