MainActivity.java
package com.cfsuman.androidtutorials;
import android.os.Bundle;
import android.app.Activity;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Get the widgets reference from XML layout
Button button = findViewById(R.id.button);
ListView listView = findViewById(R.id.listView);
// Initializing a new String Array
String[] fruits = new String[] {
"Abiu",
"Batuan",
"Black Mulberry",
"Cape Gooseberry",
"Desert banana",
"Eastern May Hawthorn",
"Fibrous Satinash",
"Gooseberry",
"Hairless rambutan",
"Illawarra Plum",
"Jelly Palm",
"Kepel fruit",
"Little gooseberry tree",
"Mammee Apple",
"Nagami Kumquat",
"Oil Palm",
"Peanut butter fruit",
"Queensland Ebony",
"Red Mulberry",
"Sageretia",
"Tahitian apple",
"Ugni",
"Vanilla",
"Watermelon",
"Yellow Granadilla",
"Zig Zag Vine"
};
// Create a List from String Array elements
List<String> fruits_list = new ArrayList<String>
(Arrays.asList(fruits));
// Create an ArrayAdapter from List
ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>
(
this,
android.R.layout.simple_list_item_1,
fruits_list
);
// DataBind ListView with items from ArrayAdapter
listView.setAdapter(arrayAdapter);
// Set button click listener
button.setOnClickListener(v -> {
// Scroll to position 14, fifteenth item of ListView
// Position is zero based index
listView.smoothScrollToPosition(14);
});
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#DCDCDC"
android:padding="24dp">
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="ListView Scroll To Fifteenth Item"
android:textAllCaps="false"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ListView
android:id="@+id/listView"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginTop="16dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/button" />
</androidx.constraintlayout.widget.ConstraintLayout>


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