Basic view

package com.example.ba;import android.os.Bundle;import android.app.Activity;import android.app.ListActivity;import android.view.Menu;import android.view.View;import android.widget.ArrayAdapter;import android.widget.ListView;import android.widget.Toast;public class MainActivity extends ListActivity { String[] presidents = {            "Dwight D. Eisenhower",            "John F. Kennedy",            "Lyndon B. Johnson",            "Richard Nixon",            "Gerald Ford",            "Jimmy Carter",            "Ronald Reagan",            "George H. W. Bush",            "Bill Clinton",            "George W. Bush",            "Barack Obama"    };@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setListAdapter (new ArrayAdapter<String>(this,                android.R.layout.simple_list_item_checked, presidents));    }        public void onListItemClick(    ListView parent, View v, int position, long id)     {               Toast.makeText(this,         "You have selected " + presidents[position],             Toast.LENGTH_SHORT).show();    }  };