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RecyclerView is viewed on the screen and detect changes, you can implement an OnScrollListener for the RecyclerView.

Frantic Flatworm answered on September 19, 2023 Popularity 1/10 Helpfulness 1/10

answer RecyclerView is viewed on the screen and detect changes, you can implement an OnScrollListener for the RecyclerView.

RecyclerView is viewed on the screen and detect changes, you can implement an OnScrollListener for the RecyclerView.

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import android.os.Bundle
import android.os.SystemClock
import androidx.appcompat.app.AppCompatActivity
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView

class MainActivity : AppCompatActivity() {

    private lateinit var recyclerView: RecyclerView
    private lateinit var adapter: MyAdapter

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        recyclerView = findViewById(R.id.recyclerView)
        adapter = MyAdapter()

        recyclerView.layoutManager = LinearLayoutManager(this)
        recyclerView.adapter = adapter

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

                val layoutManager = recyclerView.layoutManager as LinearLayoutManager
                val firstVisibleItemPosition = layoutManager.findFirstVisibleItemPosition()
                val lastVisibleItemPosition = layoutManager.findLastVisibleItemPosition()

                val currentTime = SystemClock.elapsedRealtime()

                for (i in firstVisibleItemPosition..lastVisibleItemPosition) {
                    val viewHolder = recyclerView.findViewHolderForAdapterPosition(i)
                    if (viewHolder is MyAdapter.ViewHolder) {
                        if (!viewHolder.isTimerRunning) {
                            viewHolder.startTimer(currentTime)
                        }
                    }
                }
            }
        })
    }
}

Popularity 1/10 Helpfulness 1/10 Language kotlin

Source: chat.openai.com

Tags: detect kotlin onscrolllistener screen

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Contributed on Sep 19 2023

Frantic Flatworm

0 Answers Avg Quality 2/10

RecyclerView is viewed on the screen and detect changes, you can implement an OnScrollListener for the RecyclerView.

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RecyclerView is viewed on the screen and detect changes, you can implement an OnScrollListener for the RecyclerView.

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