HashSet to ArrayList not Displaying in Listview

Question

So this project is driving me insane. Thank you to Ahmed Aeon Axan for the last answer. I have never worked with HashTables before but from the all the code I've looked at this should be working. Please tell me why this is not displaying in my listview.

Created in the model.java below

public class Model implements Serializable {
public static final int END_MORNING = 11;  // 11:00AM, inclusive
public static final int END_AFTERNOON = 16;  // 4:00PM, inclusive

private GregorianCalendar startDate;

private ArrayList<GregorianCalendar> datesSmoked = new ArrayList<GregorianCalendar>();
private ArrayList<String> locationsSmoked = new ArrayList<String>();
private ArrayList<String> locations = new ArrayList<String>();
private ArrayList<String> allIncidents = new ArrayList<String>();
private Set<String> newLocArr = new HashSet<String>(locations);
private SimpleDateFormat sdf = new SimpleDateFormat("E, MMM dd");
private ArrayList<String> times = new ArrayList<String>();

public String [] defaultLocations = {"Home", "Work", "Commuting", "School", "Bar", "Restaurant", "Social Gathering", "Other"};
public String [] eachSmoked;


public Model(GregorianCalendar date){
    startDate = date;

    for (String s : this.defaultLocations) {            
        locations.add(s);
    }
}

public Model(){
    this(new GregorianCalendar()); // now
}   

public ArrayList<String> getDates() {
    for (int i = 0; i < datesSmoked.size(); i++) {
        String s = (sdf.format(i));
        times.add(s);
    }
    return times;
}

public List<String> getPlacesSmoked() { 

    for (String key : locations) {

    newLocArr.add(key+ ": " + Collections.frequency(locationsSmoked, key)); 

    }       
    return new ArrayList<String>(newLocArr);
}

public ArrayList<String> getAllIncidentsArray() {

    for (int i = 0; i < datesSmoked.size(); i++) {
        allIncidents.add(getDates().get(i) + ", " + locationsSmoked.get(i));
    }

    return allIncidents;
}

public ArrayList<String> getlocationsArray() {
    return this.locations;
}

public ArrayList<String> getLocationsSmokedArray() {
    return this.locationsSmoked;
}

public ArrayList<GregorianCalendar> getDatesSmokedArray() {
    return this.datesSmoked;
}

Ends the relevant code for model.java

called into the list view in the Locations Activity below where it is not displaying

public class LocationActivity extends Activity {

public static final String SMOKIN_DATA_FILE = "smokin.dat";

public static Model model = null;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_location);

    restoreModel();

    ListView listView = (ListView) findViewById(R.id.location_listview_Id);
    ArrayAdapter<String> listAdapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_1, model.getPlacesSmoked());      
    listView.setAdapter(listAdapter);
    listAdapter.notifyDataSetChanged();
}

Essentially Im trying to get the ArrayList locationsSmoked which Displays
Home
Home
Home
Home
School
School
School
School

to display
Home: 4
School: 4

Answer 1

Your locTest list is empty, since it is initialized at the Model creation with empty HashSet test1 which is initialized with empty locations list.

The List(Collection<?>) constructor is copying the values, not the pointer to the collection, as far as I remember

fast solution (not sure if it do the trick actually):

public Model(GregorianCalendar date){
    startDate = date;
    for (String s : this.defaultLocations) {            
        locations.add(s);
    }           
    // calling setPlacesSmoked to process data
    setPlacesSmoked();
}

public void setPlacesSmoked() {
    // assuming that locations list holds the data needed to process
    for (String key : locations) {
        test1.add(key+ ": " + Collections.frequency(locations, key));           
    }
}


public List<String> getPlacesSmoked() {             
    //return locTest;
    return new ArrayList<String>(test1);
}

The expected output:

Home: 1
Work: 1 
Commuting: 1
School: 1
Bar: 1
Restaurant: 1
Social Gathering: 1
Other: 1

But that depends on the locations contents