List View With Index

To Display List view With Index,I created two layout,The first layout is,

separator.XML,From res/layout/separator.XML


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="wrap_content"
android:layout_width="fill_parent">
<TextView
android:id="@+id/textSeparator"
android:layout_height="wrap_content"
android:gravity="center"
android:visibility="visible"
android:layout_width="fill_parent"
android:textColor="#FFFFFF"
android:background="#808080" />
</LinearLayout>

And the List Item Layout must present in res/layout/list_item.XML


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="wrap_content"
android:layout_width="fill_parent">
<TextView
android:id="@+id/text"
android:layout_height="50dp"
android:gravity="center_vertical"
android:visibility="visible"
android:layout_width="fill_parent"
android:textColor="#FF000000"
android:background="#FFFFFFFF" />
</LinearLayout>


Below is the Code for List View With Index,

ListViewIndex.java




package com.test.list;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.TreeSet;

import android.app.ListActivity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

public class MultipleItemsList extends ListActivity {


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", "Uganda", "Ukraine",
"United Arab Emirates", "United Kingdom", "United States",
"United States Minor Outlying Islands", "Uruguay", "Uzbekistan",
"Virgin Islands", "Vanuatu", "Vatican City", "Venezuela",
"Vietnam", "Wallis and Futuna", "Western Sahara", "Yemen",
"Yugoslavia", "Zambia", "Zimbabwe" };
private MyCustomAdapter mAdapter;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mAdapter = new MyCustomAdapter();

Collections.sort(Arrays.asList(COUNTRIES)); //Sorting the Array
for (int i = 0; i < COUNTRIES.length - 1; i++) {

if (i == 0) {  
mAdapter.addSeparatorItem(COUNTRIES[i].toString().substring(0,
1));

} else if (COUNTRIES[i].toString().substring(0, 1).equalsIgnoreCase(COUNTRIES[i - 1].toString().substring(0, 1))) {  //Comparing previous position and current position


} else if (COUNTRIES[i + 1].toString().substring(0, 1)
.equalsIgnoreCase(COUNTRIES[i].toString().substring(0, 1))) {   //Comparing next position and current position

mAdapter.addSeparatorItem(COUNTRIES[i].toString().substring(0,
1));

} else {

mAdapter.addSeparatorItem(COUNTRIES[i].toString().substring(0,
1));

}
mAdapter.addItem(COUNTRIES[i].toString());

}
setListAdapter(mAdapter);
}

private class MyCustomAdapter extends BaseAdapter {

private static final int TYPE_ITEM = 0;
private static final int TYPE_SEPARATOR = 1;
private static final int TYPE_MAX_COUNT = TYPE_SEPARATOR + 1;

private final ArrayList<String> data = new ArrayList<String>();
private final LayoutInflater mInflater;

private final TreeSet<Integer> separator = new TreeSet<Integer>();

public MyCustomAdapter() {
mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

public void addItem(final String item) {
data.add(item);
notifyDataSetChanged();
}

public void addSeparatorItem(final String item) {
data.add(item);
// save separator position
separator.add(data.size() - 1);
notifyDataSetChanged();
}

@Override
public int getItemViewType(int position) {
return separator.contains(position) ? TYPE_SEPARATOR
: TYPE_ITEM;
}

@Override
public int getViewTypeCount() {
return TYPE_MAX_COUNT;
}

@Override
public int getCount() {
return data.size();
}

@Override
public String getItem(int position) {
return data.get(position);
}

@Override
public long getItemId(int position) {
return position;
}

@Override
public View getView(int position, View view, ViewGroup parent) {
ViewHolder holder = null;
int type = getItemViewType(position);
System.out.println("getView " + position + " " + view
+ " type = " + type);
if (view == null) {
holder = new ViewHolder();
switch (type) {
case TYPE_ITEM:
view = mInflater.inflate(R.layout.list_item, null);
holder.textView = (TextView) view
.findViewById(R.id.text);
break;
case TYPE_SEPARATOR:
view = mInflater.inflate(R.layout.separator, null);
holder.textView = (TextView) view
.findViewById(R.id.textSeparator);
break;
}
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
holder.textView.setText(data.get(position));
return view;
}

}

public static class ViewHolder {
public TextView textView;
}
}

And Here is the Output Window.