Android ListView

ListView: is a View which groups several items and display them in a vertical scrollable list.

Adapter: Adapter is bridge between UI component and the data which fills that UI component.

Out put will look like below:

Here is the source code: listview

1. Create Project with name ListView with Activity name as MainActivity.java.

2. Open activity_main.xml and paste below code(for listview)

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    tools:context="com.listview.MainActivity">

    <ListView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/listview"
        >
        
    </ListView>

</RelativeLayout>

2. Open strings.xml and paste below code.

    <string-array name="friends">

        <item>Friend A</item>
        <item>Friend B</item>
        <item>Friend C</item>
        <item>Friend D</item>
        <item>Friend E</item>
        <item>Friend F</item>
        <item>Friend G</item>
        <item>Friend H</item>
        <item>Friend I</item>
        <item>Friend J</item>
        <item>Friend K</item>
        <item>Friend L</item>
        <item>Friend M</item>
        <item>Friend N</item>
        <item>Friend O</item>
        <item>Friend P</item>

    </string-array>

2. create list_item inside res ->values
paste below code

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/friend_name"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:padding="10dp"
    android:text="asdf"
    android:layout_centerHorizontal="true"
    android:textSize="20dp"
    android:textAllCaps="true"
    android:textStyle="bold" >
</TextView>

3. Open MainActivity.java and paste below code

package com.listview;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private ListView listView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //creating object of listview
        listView = (ListView)findViewById(R.id.listview);

        //getting string array from resourses(values->strings.xml->friends)
       final String[] friends = getResources().getStringArray(R.array.friends);

        //creating array adapter
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,R.layout.list_item,friends);

        listView.setAdapter(adapter);

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                //showing toast message
                Toast.makeText(getApplicationContext(),friends[position],Toast.LENGTH_LONG).show();

            }
        });
    }
}