http://stackoverflow.com/questions/16610375/how-can-i-use-na

//======================
//  MainActivity.java
//======================

package com.example.nattyapp;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Map;

import com.joestelmach.natty.DateGroup;
import com.joestelmach.natty.Parser;

import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

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

        /* data source for ListView */
        List<Date> dateList = new ArrayList<Date>();
        /* simplest possible data adapter for ListView (using only built-in item layout) */
        ListAdapter listAdapter = new ArrayAdapter<Date>(this, android.R.layout.simple_list_item_1, dateList);
        lv.setAdapter(listAdapter);

        Parser parser = new Parser();
        List<DateGroup> groups = parser.parse("the day before next thursday");
        for (DateGroup group : groups) {
            List<Date> dates = group.getDates();
            int line = group.getLine();
            int column = group.getPosition();
            String matchingValue = group.getText();
            String syntaxTree = group.getSyntaxTree().toStringTree();
            Map parseMap = group.getParseLocations();
            boolean isRecurreing = group.isRecurring();
            Date recursUntil = group.getRecursUntil();

            /* if any Dates are present in current group then add them to dateList */
            if (group.getDates() != null) {
                dateList.addAll(group.getDates());
            }
        }
        Log.i("NATTY-APP", "Test app is complete");
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}


//==================================
// activity_main.xml
//==================================
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <ListView
        android:id="@+id/lv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/tv"
        android:layout_marginTop="16dp" >
    </ListView>

</RelativeLayout>



//==================================
// AndroidManifest.xml
//==================================
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.nattyapp"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.nattyapp.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>