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How to detect Scroll Up & Scroll down in Android ListView using Kotlin?
This example demonstrates how to detect Scroll Up & Scroll down in Android ListView using Kotlin.
Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.
Step 2 − Add the following code to res/layout/activity_main.xml.
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical" android:padding="8dp" tools:context=".MainActivity"> <ListView android:id="@+id/listView" android:layout_width="match_parent" android:layout_height="match_parent" /> </LinearLayout>
Step 3 − Add the following code to src/MainActivity.kt
import android.os.Bundle import android.widget.* import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() { private var scrollView: ScrollView? = null private lateinit var listView: ListView private var numbers = arrayOf( "1", "2", "3", "4", "5", "6", "7", "8", "9", "X", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24", "25" ) override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) title = "KotlinApp" scrollView = findViewById(R.id.scrollView) val adapter: ArrayAdapter<*> = ArrayAdapter( this, R.layout.support_simple_spinner_dropdown_item, numbers ) listView = findViewById(R.id.listView) listView.adapter = adapter listView.setOnScrollListener(object : AbsListView.OnScrollListener { private var lastFirstVisibleItem = 0 override fun onScrollStateChanged(view: AbsListView, scrollState: Int) {} override fun onScroll( view: AbsListView, firstVisibleItem: Int, visibleItemCount: Int, totalItemCount: Int ) { if (lastFirstVisibleItem < firstVisibleItem) { Toast.makeText( applicationContext, "Scrolling down the listView", Toast.LENGTH_SHORT ).show() } if (lastFirstVisibleItem > firstVisibleItem) { Toast.makeText( applicationContext, "Scrolling up the listView", Toast.LENGTH_SHORT ).show() } lastFirstVisibleItem = firstVisibleItem } }) } }
Step 4 − Add the following code to androidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.q11"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click the Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen
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