We do not require ListView Layout as List Activity has a built-in layout.

However, we need to define a Row Layout and Custom Adapter in order to implement HashMap structure

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout

   xmlns:android="http://schemas.android.com/apk/res/android"

   android:layout_width="match_parent"

   android:layout_height="match_parent"

   android:orientation="horizontal"

   android:padding="10dp" >

   <TextView

       android:id="@+id/name"

       android:layout_width="match_parent"

       android:layout_height="wrap_content"

       android:layout_weight="1"

       android:padding="5dp"

       android:textSize="18dp" />

   <TextView

       android:id="@+id/code"

       android:layout_width="wrap_content"

       android:layout_height="wrap_content"

       android:padding="5dp" />

</LinearLayout>

package com.notarazi.mylistactivitysimpleadapterhashmap1;

import android.app.ListActivity;

import android.os.Bundle;

import android.widget.ListAdapter;

import android.widget.SimpleAdapter;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.Locale;

public class MainActivity extends ListActivity {

       ArrayList<HashMap<String, String>> countries;

       @Override

       protected void onCreate(Bundle savedInstanceState) {

           super.onCreate(savedInstanceState);

           String[] locales = Locale.getISOCountries();

           countries = new ArrayList<HashMap<String, String>>();

           for (String countryCode : locales) {

               Locale obj = new Locale("", countryCode);

               HashMap<String, String> country = new HashMap<String, String>();

               String country_name = obj.getDisplayCountry();

               String country_code = obj.getCountry();

               country.put("name", country_name);

               country.put("code", country_code);

               countries.add(country);

           }

           //  keys of hashmap

           String[] from = { "name", "code" };

           // view id's to which data to be binded

           int[] to = { R.id.name, R.id.code };

           //Creating Adapter

           ListAdapter adapter = new SimpleAdapter(MainActivity.this, countries,

                   R.layout.row_layout, from, to);

           //Setting Adapter to ListView

           setListAdapter(adapter);

       }

   }