Quick Scroll in Android ListView

Step 1: Create a project named as Quick Scroll:

Step 2: Copy Below Code into Main Activity

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.Set;

import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.SectionIndexer;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {
ListView lv;

/* Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

lv = (ListView) findViewById(R.id.listView1);

LinkedList<String> mLinked = new LinkedList<String>();
for (int i = 0; i < COUNTRIES.length; i++) {
mLinked.add(COUNTRIES[i]);
}

// setListAdapter(new MyListAdaptor(this, mLinked));

// ListView lv = getListView();
lv.setAdapter(new MyListAdaptor(this, mLinked));
lv.setFastScrollEnabled(true);

lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// When clicked, show a toast with the TextView text
Toast.makeText(getApplicationContext(),
((TextView) view).getText(), Toast.LENGTH_SHORT).show();
}
});
}

static final String[] COUNTRIES = new String[] { "Afghanistan", "Albania",
"Algeria", "American Samoa", "Andorra", "Angola", "Anguilla",
"Antarctica", "Antigua and Barbuda", "Argentina", "Armenia",
"Aruba", "Australia", "Austria", "Azerbaijan", "Bahrain",
"Bangladesh", "Barbados", "Belarus", "Belgium", "Belize", "Benin",
"Bermuda", "Bhutan", "Bolivia", "Bosnia and Herzegovina",
"Botswana", "Bouvet Island", "Brazil",
"British Indian Ocean Territory", "British Virgin Islands",
"Brunei", "Bulgaria", "Burkina Faso", "Burundi", "Cote d'Ivoire",
"Cambodia", "Cameroon", "Canada", "Cape Verde", "Cayman Islands",
"Central African Republic", "Chad", "Chile", "China",
"Christmas Island", "Cocos (Keeling) Islands", "Colombia",
"Comoros", "Congo", "Cook Islands", "Costa Rica", "Croatia",
"Cuba", "Cyprus", "Czech Republic",
"Democratic Republic of the Congo", "Denmark", "Djibouti",
"Dominica", "Dominican Republic", "East Timor", "Ecuador", "Egypt",
"El Salvador", "Equatorial Guinea", "Eritrea", "Estonia",
"Ethiopia", "Faeroe Islands", "Falkland Islands", "Fiji",
"Finland", "Former Yugoslav Republic of Macedonia", "France",
"French Guiana", "French Polynesia", "French Southern Territories",
"Gabon", "Georgia", "Germany", "Ghana", "Gibraltar", "Greece",
"Greenland", "Grenada", "Guadeloupe", "Guam", "Guatemala",
"Guinea", "Guinea-Bissau", "Guyana", "Haiti",
"Heard Island and McDonald Islands", "Honduras", "Hong Kong",
"Hungary", "Iceland", "India", "Indonesia", "Iran", "Iraq",
"Ireland", "Israel", "Italy", "Jamaica", "Japan", "Jordan",
"Kazakhstan", "Kenya", "Kiribati", "Kuwait", "Kyrgyzstan", "Laos",
"Latvia", "Lebanon", "Lesotho", "Liberia", "Libya",
"Liechtenstein", "Lithuania", "Luxembourg", "Macau", "Madagascar",
"Malawi", "Malaysia", "Maldives", "Mali", "Malta",
"Marshall Islands", "Martinique", "Mauritania", "Mauritius",
"Mayotte", "Mexico", "Micronesia", "Moldova", "Monaco", "Mongolia",
"Montserrat", "Morocco", "Mozambique", "Myanmar", "Namibia",
"Nauru", "Nepal", "Netherlands", "Netherlands Antilles",
"New Caledonia", "New Zealand", "Nicaragua", "Niger", "Nigeria",
"Niue", "Norfolk Island", "North Korea", "Northern Marianas",
"Norway", "Oman", "Pakistan", "Palau", "Panama",
"Papua New Guinea", "Paraguay", "Peru", "Philippines",
"Pitcairn Islands", "Poland", "Portugal", "Puerto Rico", "Qatar",
"Reunion", "Romania", "Russia", "Rwanda", "Sqo Tome and Principe",
"Saint Helena", "Saint Kitts and Nevis", "Saint Lucia",
"Saint Pierre and Miquelon", "Saint Vincent and the Grenadines",
"Samoa", "San Marino", "Saudi Arabia", "Senegal", "Seychelles",
"Sierra Leone", "Singapore", "Slovakia", "Slovenia",
"Solomon Islands", "Somalia", "South Africa",
"South Georgia and the South Sandwich Islands", "South Korea",
"Spain", "Sri Lanka", "Sudan", "Suriname",
"Svalbard and Jan Mayen", "Swaziland", "Sweden", "Switzerland",
"Syria", "Taiwan", "Tajikistan", "Tanzania", "Thailand",
"The Bahamas", "The Gambia", "Togo", "Tokelau", "Tonga",
"Trinidad and Tobago", "Tunisia", "Turkey", "Turkmenistan",
"Turks and Caicos Islands", "Tuvalu", "Virgin Islands", "Uganda",
"Ukraine", "United Arab Emirates", "United Kingdom",
"United States", "United States Minor Outlying Islands", "Uruguay",
"Uzbekistan", "Vanuatu", "Vatican City", "Venezuela", "Vietnam",
"Wallis and Futuna", "Western Sahara", "Yemen", "Yugoslavia",
"Zambia", "Zimbabwe" };

/**
* The List row creator
*/
class MyListAdaptor extends ArrayAdapter<String> implements SectionIndexer {

HashMap<String, Integer> alphaIndexer;
String[] sections;

public MyListAdaptor(Context context, LinkedList<String> items) {
super(context, R.layout.list_item, items);

alphaIndexer = new HashMap<String, Integer>();
int size = items.size();

for (int x = 0; x < size; x++) {
String s = items.get(x);
// get the first letter of the store
String ch = s.substring(0, 1);
// convert to uppercase otherwise lowercase a -z will be sorted
// after upper A-Z
ch = ch.toUpperCase();
// put only if the key does not exist
if (!alphaIndexer.containsKey(ch))
alphaIndexer.put(ch, x);
}

Set<String> sectionLetters = alphaIndexer.keySet();
// create a list from the set to sort
ArrayList<String> sectionList = new ArrayList<String>(
sectionLetters);
Collections.sort(sectionList);
sections = new String[sectionList.size()];
sections = sectionList.toArray(sections);
}

@Override
public int getPositionForSection(int section) {
return alphaIndexer.get(sections[section]);
}

@Override
public int getSectionForPosition(int position) {
return 0;
}

@Override
public Object[] getSections() {
return sections;
}
}
}

Step 3: Copy Below Code into xml file activity_main


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <ListView
        android:id="@+id/listView1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >
    </ListView>

</LinearLayout>

Step 4: Create an XML layout File named as list_item and paste the Following Code into It
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:padding="10dp"
    android:textSize="16sp" >
</TextView>

Run and Enjoy :)

Out Put Will Be like This :)