How to pass Adapter to Model class in android

Question

In my application i want use multiple timer into recyclerview.
For not reset timer when scrolling on recyclerview's items i write CountDown timer into model class.

For this i should call notifyItemChanged into model class.
But i don't know how can i send adapter to model class!

My model class :

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()
    }
}

Adapter codes:

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 }
        }
}

Activity codes:

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()
                            }
                        }
                    }
                }
            })
        }
    }
}

How can i it?

You need to move the CountDownTimer at least to the Adapter or to the Activity. From there, you need to maintain a list of CountDownTimer paired with your model. Don't pollute your model with CountDownTimer. — ישו אוהב אותך, Mar 20 '19 at 07:29
@ישואוהבאותך , when use countDownTimer into adapter when scrolling items timer has reset! — Jake warton, Mar 20 '19 at 07:31
@Praveen, how can i it? can you help me and send to me code? please — Jake warton, Mar 20 '19 at 07:38
show your acivity class and could you please specify your question — Praveen, Mar 20 '19 at 07:42
i don't understand your question, why you using CountDown timer ? is that for calling notifyItemChanged ? — Praveen, Mar 20 '19 at 08:43
Let us [continue this discussion in chat](https://chat.stackoverflow.com/rooms/190353/discussion-between-praveen-and-jake-warton). — Praveen, Mar 20 '19 at 08:59

score 0 · Answer 1 · answered Mar 20 '19 at 07:33

You can either build an interface in model class (which needs to be initialized in your activity) and use it to send information by implementing it in adapter. Another way is to make your own callback and listener. Follow these links; Java Interfaces , Callback & Listeners.

You can see more guides and examples here: Beginning Android Resources

Praveen · Answer 2 · 2019-03-20T12:53:34.983

call this method from onResponse(..)

  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
                    }

                })

 }

and call it from adapter

(context as Your_Activity_Name).recyclerScroll()

you say use timer into activity? i want change items UI with timer. then i should use this into adapter — Jake warton, Mar 20 '19 at 12:42
move above code to a method and you can call it from adapter — Praveen, Mar 20 '19 at 12:44
how can i it? can you send code with my above codes ? please — Jake warton, Mar 20 '19 at 12:47

How to pass Adapter to Model class in android

2 Answers2