Android Open Source - openhds-tablet Show Map Activity

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License

The source code is released under:
OPENHDS PLATFORM OPENSOURCE LICENSE AGREEMENT Copyright (c) 2013 University of Southern Maine. All rights reserved. Redistribution and use in source and binary forms, with or without mo...
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Java Source Code

package org.openhds.mobile.activity;
/*from ww  w .  ja v a  2 s .c  o m*/
import java.util.ArrayList;
import java.util.List;

import org.openhds.mobile.Converter;
import org.openhds.mobile.Queries;
import org.openhds.mobile.R;
import org.openhds.mobile.adapter.AdapterContent;
import org.openhds.mobile.adapter.MapAdapter;
import org.openhds.mobile.database.DatabaseAdapter;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.Toast;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnCameraChangeListener;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.CameraPosition;
import com.google.android.gms.maps.model.LatLng;


public class ShowMapActivity extends FragmentActivity implements OnItemClickListener, OnCameraChangeListener {
  
  private static final long MINIMUM_DISTANCE_CHANGE_FOR_UPDATES = 1; // meters
  private static final long MINIMUM_TIME_BETWEEN_UPDATES = 1000; // milliseconds
  private static final double METER_TO_MILE = 1609.34;
  private static final double LOCATION_RADIUS = 0.5;
  
  private DatabaseAdapter databaseAdapter;
  //private MapView mapView;
  private ListView locationsView;
  private LocationManager locationManager;
  //private MyLocationOverlay myLocationOverlay;
  private GeoUpdateHandler handler;
  private GoogleMap googleMap;

  public void onCreate(Bundle bundle) {
    super.onCreate(bundle);
    setContentView(R.layout.map_view);
    
      setDatabaseAdapter(new DatabaseAdapter(getBaseContext()));
    handler = new GeoUpdateHandler();

    FragmentManager myFragmentManager = getSupportFragmentManager();
       SupportMapFragment mySupportMapFragment
        = (SupportMapFragment)myFragmentManager.findFragmentById(R.id.mapview);
       googleMap = mySupportMapFragment.getMap();
        
       googleMap.setMyLocationEnabled(true);
     
       //googleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
       //googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
       //googleMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
         googleMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
         
         googleMap.setOnCameraChangeListener(new OnCameraChangeListener() {
                
           public void onCameraChange(CameraPosition arg0) {
          
        googleMap.animateCamera(CameraUpdateFactory.zoomTo(13));
              googleMap.setOnCameraChangeListener(ShowMapActivity.this);
            }
      });
    locationsView = (ListView) findViewById(R.id.locationsListView);
    locationsView.setOnItemClickListener(this);
    
    
    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    
    if (!locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER))
      buildAlertMessageNoGPS();
    
    else {
      locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 
          MINIMUM_TIME_BETWEEN_UPDATES, MINIMUM_DISTANCE_CHANGE_FOR_UPDATES, handler);
      
      
      final LatLng pos = new LatLng(-0.4, 34.166667);
      /*googleMap.addMarker(new MarkerOptions()
                                .position(rusinga)
                                .title("Rusinga")
                               .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE)));*/
      
      
      //final LatLng pos = displayCurrentLocation();
       googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(pos, 22));
      /*  googleMap.setOnCameraChangeListener(new OnCameraChangeListener() {
              public void onCameraChange(CameraPosition arg0) {
                  googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(pos, 13));
              }
          });*/
      
      
      displayCurrentLocation();
      List<org.openhds.mobile.model.Location> nearestLocations = displayNearestLocations();
      populateListView(nearestLocations);
    }
  }

  private LatLng displayCurrentLocation() {
    Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
    if (location==null){
      location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
    }
    if (location!=null){
    String message = String.format(getString(R.string.map_curlocation_format_lbl),
        location.getLongitude(), location.getLatitude());
        Toast.makeText(this, message, Toast.LENGTH_LONG).show();        
        return new LatLng(location.getLatitude() , location.getLongitude());
    } else {
      return new LatLng(-0.4, 34.166667);
    }
  }
  
  
  
  private List<org.openhds.mobile.model.Location> displayNearestLocations() {
    double currentLatitude;
    double currentLongitude;
    
    Location currentLocation = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
    if (currentLocation==null){
      currentLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
    }
    if (currentLocation!=null){
      currentLatitude = currentLocation.getLatitude();
      currentLongitude = currentLocation.getLongitude();
    } else {
      currentLatitude = -0.4;
      currentLongitude = 34.166667;
    }
    
    List<org.openhds.mobile.model.Location> nearestLocations = new ArrayList<org.openhds.mobile.model.Location>();
    
    Cursor cursor = Queries.allLocations(getContentResolver());
    List<org.openhds.mobile.model.Location> locations = Converter.toLocationList(cursor);
    for (org.openhds.mobile.model.Location loc : locations) {
      
      if (loc.getLatitude().equals("Unknown") || loc.getLongitude().equals("Unknown") || 
        loc.getLatitude().equals("") || loc.getLongitude().equals(""))
        continue;
      
      double latitude = Double.parseDouble(loc.getLatitude());
      double longitude = Double.parseDouble(loc.getLongitude());
      
      float[] results = new float[1];
      Location.distanceBetween(currentLatitude, currentLongitude, latitude, longitude, results);
      float result = results[0];
      
      if (result < (METER_TO_MILE * LOCATION_RADIUS))
        nearestLocations.add(loc);
    }
    return nearestLocations;
  }
  
  private void populateListView(List<org.openhds.mobile.model.Location> nearestLocations) {
    AdapterContent[] content = new AdapterContent[nearestLocations.size()];
    
    for (int i = 0; i < nearestLocations.size(); i++) {
      content[i] = new AdapterContent(nearestLocations.get(i).getName(), nearestLocations.get(i).getExtId());
    }
    
    MapAdapter adapter = new MapAdapter(this, R.layout.custom_row, content);     
        locationsView.setAdapter(adapter);
  }
  
  private void buildAlertMessageNoGPS() {
    AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
    alertDialogBuilder.setTitle(getString(R.string.warning_lbl));
    alertDialogBuilder.setMessage(getString(R.string.showmap_gps_disabled_lbl));
    alertDialogBuilder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog, int which) {
        dialog.dismiss();
      }
    });  
    AlertDialog alertDialog = alertDialogBuilder.create();
    alertDialog.show();
  }

  
  @Override
  protected void onResume() {
    super.onResume();
    if (googleMap != null) {
      googleMap.setMyLocationEnabled(true);
      googleMap.getUiSettings().setCompassEnabled(true);
    }
  }
  
  @Override
  protected void onDestroy() {
    super.onDestroy();
    locationManager.removeUpdates(handler);
  }

  @Override
  protected void onPause() {
    super.onPause();
    if (googleMap != null) {
      googleMap.setMyLocationEnabled(false);
      googleMap.getUiSettings().setCompassEnabled(false);
    }
  }
    
  public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    AdapterContent content = (AdapterContent) locationsView.getItemAtPosition(position);
    Intent i = new Intent();
    i.putExtra("name", content.getItem1());
    i.putExtra("extId", content.getItem2());
    setResult(Activity.RESULT_OK, i);
    finish();  
  }
  
  public DatabaseAdapter getDatabaseAdapter() {
    return databaseAdapter;
  }

  public void setDatabaseAdapter(DatabaseAdapter databaseAdapter) {
    this.databaseAdapter = databaseAdapter;
  }

  public class GeoUpdateHandler implements LocationListener {

    public void onLocationChanged(Location location) {
      int lat = (int) (location.getLatitude() * 1E6);
      int lng = (int) (location.getLongitude() * 1E6);
      final LatLng point = new LatLng(lat, lng);
      googleMap.setOnCameraChangeListener(new OnCameraChangeListener() {
            public void onCameraChange(CameraPosition arg0) {
                googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(point, 13));
            }
        });
          displayCurrentLocation();
    }

  public void onProviderDisabled(String provider) { 
      Toast.makeText(ShowMapActivity.this, getString(R.string.showmap_gps_turned_off), Toast.LENGTH_LONG).show();
    }

    public void onProviderEnabled(String provider) { 
      Toast.makeText(ShowMapActivity.this, getString(R.string.showmap_gps_turned_on), Toast.LENGTH_LONG).show();
    }

    public void onStatusChanged(String provider, int status, Bundle extras) { 
      Toast.makeText(ShowMapActivity.this, getString(R.string.showmap_gps_changed), Toast.LENGTH_LONG).show();
    }
  }

  public void onCameraChange(CameraPosition position) {
    // TODO Auto-generated method stub
  }
}
Java Source Code List
