Check Which Items Are Selected in ListView

<?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" >

    <Button
        android:id="@+id/btn"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Show selected items"
        android:onClick="onClick"/>

    <ListView
        android:id="@+id/list"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, BasicViews5Activity!</string>
    <string name="app_name">BasicViews5</string>
    <string-array name="presidents_array">
        <item>Dwight D. Eisenhower</item>
        <item>John F. Kennedy</item>
        <item>Lyndon B. Johnson</item>
        <item>Richard Nixon</item>
        <item>Gerald Ford</item>
        <item>Jimmy Carter</item>
        <item>Ronald Reagan</item>
        <item>George H. W. Bush</item>
        <item>Bill Clinton</item>
        <item>George W. Bush</item>
        <item>Barack Obama</item>
    </string-array>
</resources>

package com.java2s.myapplication3.app;
//w w w .j ava2 s  . c  o m
import android.app.ListActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends ListActivity  {

    String[] presidents;

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

        setContentView(R.layout.activity_main);

        ListView lstView = getListView();
        lstView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
        lstView.setTextFilterEnabled(true);

        presidents =getResources().getStringArray(R.array.presidents_array);

        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();
    }

    public void onClick(View view) {
        ListView lstView = getListView();

        String itemsSelected = "Selected items: \n";
        for (int i=0; i<lstView.getCount(); i++) {
            if (lstView.isItemChecked(i)) {
                itemsSelected += lstView.getItemAtPosition(i) + "\n";
            }
        }
        Toast.makeText (this, itemsSelected, Toast.LENGTH_LONG).show();
    }

}