ListView not updating

dashboardactivity.java

package com.badcheese.androidhive;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Random;

import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.DialogInterface;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Color;
import android.graphics.Typeface;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.provider.Settings;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
import android.util.Log;

import com.badcheese.androidhive.JSONParser;
import com.badcheese.androidhive.R;
import com.badcheese.androidhive.SingleMenuItemActivity;
import com.badcheese.androidhive.library.DatabaseHandler;
import com.badcheese.androidhive.library.UserFunctions;

public class DashboardActivity extends Activity implements LocationListener {
  private TextView latituteField;
	private TextView longitudeField;
	private TextView altitudeField;
	private TextView accuracyField;
	private ListView lv;
	private LocationManager locationManager;
	private String provider;
	UserFunctions userFunctions;
	Button btnLogout;
	Button newnote;
	Button refresh;
	Button reload;
	Location location;
	ListAdapter adapter;
	
	private static String url = "http://badcheese.com/~steve/geonote/places.php";
	
	// JSON Node names
	private static final String TAG_LOCATIONS = "locations";
	private static final String TAG_TITLE = "title";
	private static final String TAG_NOTE = "note";
	private static final String TAG_SUMMARY = "summary";
	private static final String TAG_ALT = "alt";
	private static final String TAG_LAT = "lat";
	private static final String TAG_LON = "lon";
	private static final String TAG_DISTANCE = "distance";
	private static final String TAG_CREATED = "created";
	private static final String TAG_EXPIRES = "expires";
	private static final String TAG_ID = "id";

    // flag for GPS and network status
    boolean isGPSEnabled = false;
    boolean isNetworkEnabled = false;
	
	// contacts JSONArray
	JSONArray locations = null;

	ArrayList<HashMap<String, String>> contactList = new ArrayList<HashMap<String, String>>();
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        /**
         * Dashboard Screen for the application
         * */        
        // Get the location manager
        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
		
		
        // Check login status in database
        userFunctions = new UserFunctions();
        if(userFunctions.isUserLoggedIn(getApplicationContext())){
        	setContentView(R.layout.dashboard);
/*
        	newnote = (Button) findViewById(R.id.btnLogout);
        	newnote.setOnClickListener(new View.OnClickListener() {
    			public void onClick(View arg0) {
    				// TODO Auto-generated method stub
    				userFunctions.logoutUser(getApplicationContext());
    				Intent login = new Intent(getApplicationContext(), LoginActivity.class);
    	        	login.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    	        	startActivity(login);
    	        	// Closing dashboard screen
    	        	finish();
    			}
    		});
*/     

        	btnLogout = (Button) findViewById(R.id.new_note_btn);
        	btnLogout.setOnClickListener(new View.OnClickListener() {
    			public void onClick(View arg0) {
    				Intent newnote = new Intent(getApplicationContext(), NewNoteActivity.class);
    	        	startActivity(newnote);
    			}
    		});

            latituteField = (TextView) findViewById(R.id.TextView02);
            longitudeField = (TextView) findViewById(R.id.TextView04);
            altitudeField = (TextView) findViewById(R.id.TextView06);
            accuracyField = (TextView) findViewById(R.id.TextView08);


    		
        	refresh = (Button) findViewById(R.id.refresh_btn);        	
        	refresh.setOnClickListener(new View.OnClickListener() {
    			public void onClick(View arg0) {
    				try {
    					DatabaseHandler db = new DatabaseHandler(getApplicationContext());
    					contactList = db.getNotes(latituteField.getText().toString(),longitudeField.getText().toString());
//    					System.out.println("ContactList: " + contactList);
    		    		lv = (ListView) findViewById(R.id.list_view);
    					ListAdapter adp = lv.getAdapter();
    					((BaseAdapter) adp).notifyDataSetChanged();
    					System.out.println("adapter: " + adapter + " told that there is new data");
//    					lv.destroyDrawingCache();
//    					lv.setVisibility(ListView.INVISIBLE);
//    					lv.setVisibility(ListView.VISIBLE);
//    					lv.invalidateViews();
//    					lv.scrollBy(0, 0);
    				} catch (Exception e) {
    					e.printStackTrace();
    				}
    			}
    		});

        	reload = (Button) findViewById(R.id.reload_btn);        	
        	reload.setOnClickListener(new View.OnClickListener() {
    			public void onClick(View arg0) {
    				// Creating JSON Parser instance
    				JSONParser jsonParser = new JSONParser();
    		     
    				List<NameValuePair> params = new ArrayList<NameValuePair>();
    				params.add(new BasicNameValuePair("lat", latituteField.getText().toString()));
    				params.add(new BasicNameValuePair("lon", longitudeField.getText().toString()));
    				
    				// getting JSON string from URL
    				JSONObject json = jsonParser.getJSONFromUrl(url, params);
//    				Log.e("JSON", json.toString());
    				try {
    						// Getting Array of Contacts
    						locations = json.getJSONArray(TAG_LOCATIONS);
    						
    						DatabaseHandler db = new DatabaseHandler(getApplicationContext());
    			
    						// looping through All Contacts
    						for(int i = 0; i < locations.length(); i++){
    							JSONObject c = locations.getJSONObject(i);
    							
    							// Storing each json item in variable
    							String id = c.getString(TAG_ID);
    							String title = c.getString(TAG_TITLE);
    							String note = c.getString(TAG_NOTE);
    							String summary = c.getString(TAG_SUMMARY);
    							String my_lat = c.getString(TAG_LAT);
    							String my_lon = c.getString(TAG_LON);
    							String my_alt = c.getString(TAG_ALT);
    							String expires = c.getString(TAG_EXPIRES);    				
    							String created = c.getString(TAG_CREATED);
    							String uid = c.getString("uid");
    							String rating = c.getString("rating");
    							String num_ratings = c.getString("num_ratings");
    							String num_abuses = c.getString("num_abuses");
    							String sponsored = c.getString("sponsored");
    							String isprivate = c.getString("private");
    							
    							db.addNote(
    								id,
    								title,
    								summary,
    								note,
    								my_lat,
    								my_lon,
    								my_alt,
    								created,
    								expires,
    								uid,
    								rating,
    								num_ratings,
    								num_abuses,
    								sponsored,
    								isprivate
    							);
						}
    			    } catch (JSONException e) {
    			    	e.printStackTrace();
    				}
    			}
    		});

        	
            // Define the criteria how to select the location provider -> use
            // default
            try {
	            Criteria criteria = new Criteria();
	            criteria.setAccuracy(Criteria.ACCURACY_FINE);
	            criteria.setAltitudeRequired(true);
	            criteria.setBearingRequired(false);
	            criteria.setCostAllowed(true);
	            criteria.setPowerRequirement(Criteria.POWER_LOW);
	            criteria.setSpeedRequired(false);
	            criteria.setHorizontalAccuracy(Criteria.ACCURACY_LOW);
	            
	            provider = locationManager.getBestProvider(criteria, true);            
            	location = locationManager.getLastKnownLocation(provider);
                isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
                isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);

                if (!isGPSEnabled && !isNetworkEnabled) {
                	showSettingsAlert();
                }
                if (location != null) {
                    System.out.println("Provider " + provider + " has been selected.");
                    onLocationChanged(location);
                } else {
                    latituteField.setText("N/A");
                    longitudeField.setText("N/A");
                    altitudeField.setText("N/A");
                    accuracyField.setText("N/A");
                }                
            } catch (Exception e) {
                e.printStackTrace();
            }

            
//			DatabaseHandler db = new DatabaseHandler(getApplicationContext());
//			contactList = db.getNotes(latituteField.getText().toString(),longitudeField.getText().toString());
            contactList.clear();
//			System.out.println("ContactList: " + contactList);
//			((BaseAdapter) adapter).notifyDataSetChanged();
//			System.out.println("adapter: " + adapter + " told that there is new data");
			
			adapter = new SimpleAdapter(this, contactList,
					R.layout.list_item,
					new String[] { TAG_TITLE, TAG_CREATED, TAG_DISTANCE, TAG_SUMMARY, TAG_EXPIRES, TAG_NOTE }, new int[] {
							R.id.title, R.id.created, R.id.distance, R.id.summary, R.id.expires, R.id.note });
			
    		lv = (ListView) findViewById(R.id.list_view);
//			lv.invalidateViews();
//			lv.scrollBy(0, 0);
    		lv.setAdapter(adapter);
    		lv.setOnItemClickListener(new OnItemClickListener() {

    			@Override
    			public void onItemClick(AdapterView<?> parent, View view,
    					int position, long id) {
    				// getting values from selected ListItem
    				String title = ((TextView) view.findViewById(R.id.title)).getText().toString();
    				String created = ((TextView) view.findViewById(R.id.created)).getText().toString();
    				String expires = ((TextView) view.findViewById(R.id.expires)).getText().toString();
    				String note = ((TextView) view.findViewById(R.id.note)).getText().toString();
    				
    				// Starting new intent
    				Intent in = new Intent(getApplicationContext(), SingleMenuItemActivity.class);
    				in.putExtra(TAG_TITLE, title);
    				in.putExtra(TAG_CREATED, created);    				
    				in.putExtra(TAG_EXPIRES, expires);
    				in.putExtra(TAG_NOTE, note);
    				startActivity(in);
    			}
    		});

        }else{
        	// user is not logged in show login screen
        	Intent login = new Intent(getApplicationContext(), LoginActivity.class);
        	login.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        	startActivity(login);
        	// Closing dashboard screen
        	finish();
        }
    }        

    /*
    public class MySimpleAdapter extends SimpleAdapter {

        private ArrayList<HashMap<String, String>> results;

        public MySimpleAdapter(OnClickListener onClickListener, ArrayList<HashMap<String, String>> data, int resource, String[] from, int[] to) {
            super((Context) onClickListener, data, resource, from, to);
            this.results = data;
        }
    }
    */
    
	/* Request updates at startup */
    @Override
    protected void onResume() {
      super.onResume();
      locationManager.requestLocationUpdates(provider, 1000, 10, this);
    }

    /* Remove the locationlistener updates when Activity is paused */
    @Override
    protected void onPause() {
      super.onPause();
      locationManager.removeUpdates(this);
    }
    
    public void onLocationChanged(Location location) {
      float lat = (float) (location.getLatitude());
      float lng = (float) (location.getLongitude());
      float alt = (float) (location.getAltitude());
      float acc = (float) (location.getAccuracy());
      latituteField.setText(String.valueOf(lat));
      longitudeField.setText(String.valueOf(lng));
      altitudeField.setText(String.valueOf(alt));
      accuracyField.setText(String.valueOf(acc));
      if (acc >= 50.0) {
      	accuracyField.setTextColor(0xffff8888);
      } else {
      	accuracyField.setTextColor(0xff88ff88);
      }
    }

    public void onStatusChanged(String provider, int status, Bundle extras) {
      // TODO Auto-generated method stub
    }

    /*
    public ListAdapter Refresh() {
		ListAdapter adapter = new SimpleAdapter(this, contactList,
				R.layout.list_item,
				new String[] { TAG_TITLE, TAG_CREATED, TAG_DISTANCE, TAG_SUMMARY, TAG_EXPIRES, TAG_NOTE }, new int[] {
						R.id.title, R.id.created, R.id.distance, R.id.summary, R.id.expires, R.id.note });

		try {
			DatabaseHandler db = new DatabaseHandler(getApplicationContext());
			contactList = db.getNotes(latituteField.getText().toString(),longitudeField.getText().toString());
		} catch (Exception e) {
			e.printStackTrace();
		}
		return adapter;
    }
    */
    
    public void Disabled(String error) {
        Toast.makeText(this, "Not working yet. " + error,
            Toast.LENGTH_LONG).show();
    }

    public void onProviderEnabled(String provider) {
    	Toast.makeText(this, "Enabled new provider " + provider,
			Toast.LENGTH_SHORT).show();
    }

    public void onProviderDisabled(String provider) {
    	Toast.makeText(this, "Disabled provider " + provider,
			Toast.LENGTH_SHORT).show();        
	}
    
    public void showSettingsAlert(){
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(this);
      
        // Setting Dialog Title
        alertDialog.setTitle("GPS settings");
  
        // Setting Dialog Message
        alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");
  
        // Setting Icon to Dialog
        //alertDialog.setIcon(R.drawable.delete);
  
        // On pressing Settings button
        alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog,int which) {
                Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                startActivity(intent);
            }
        });
  
        // on pressing cancel button
        alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
            dialog.cancel();
            }
        });
  
        // Showing Alert Message
        alertDialog.show();
    }
}