How to put a ListView into a ScrollView without it collapsing on Android in Kotlin?

Kotlin AndroidApps/ApplicationsMobile Development

This example demonstrates how to put a ListView into a ScrollView without it collapsing on Android in 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.

Example

<?xml version="1.0" encoding="utf-8"?>
<ScrollView 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:padding="4dp"
   tools:context=".MainActivity">
<LinearLayout
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="vertical">
<ListView
   android:id="@+id/listView"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent" />
</LinearLayout>
</ScrollView>

Step 3 − Add the following code to src/MainActivity.kt

import android.os.Bundle
import android.widget.ArrayAdapter
import android.widget.ListView
import androidx.appcompat.app.AppCompatActivity
class MainActivity : AppCompatActivity() {
   private val listViewArray = arrayOf(
      "ONE", "TWO", "THREE", "FOUR", "FIVE", "SIX", "SEVEN", "EIGHT", "NINE",
      "TEN", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen"
   )
   lateinit var list: ListView
   override fun onCreate(savedInstanceState: Bundle?) {
      super.onCreate(savedInstanceState)
      setContentView(R.layout.activity_main)
      title = "KotlinApp";
      list = findViewById(R.id.listView)
      list.adapter = ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, listViewArray)
      ListHelper.getListViewSize(list)
   }
}

Step 4 − Create a new Kotlin class ListHelper.kt and add the following code

import android.util.Log
import android.widget.ListAdapter
import android.widget.ListView
object ListHelper {
   fun getListViewSize(myListView: ListView) {
      val myListAdapter: ListAdapter = myListView.adapter
      ?: //do nothing return null
      return
      //set listAdapter in loop for getting final size
      var totalHeight = 0
      for (size in 0 until myListAdapter.count) {
         val listItem = myListAdapter.getView(size, null, myListView)
         listItem.measure(0, 0)
         totalHeight += listItem.measuredHeight
      }
      //setting listView item in adapter
      val params = myListView.layoutParams
      params.height =
      totalHeight + myListView.dividerHeight * (myListAdapter.count - 1)
      myListView.layoutParams = params
      // print height of adapter on log
      Log.i("height of listItem:", totalHeight.toString())
   }
}

Step 5 − 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

raja
Published on 21-Jul-2020 07:30:04
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