MapActivity.java

/** MapActivity
 *  The primary activity for the mapping functionality of PurdueApp. 
 */

package edu.purdue.app.map;

import java.util.ArrayList;
import java.util.List;

import com.google.android.gms.common.GooglePlayServicesNotAvailableException;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.MapsInitializer;
import com.google.android.gms.maps.model.*;
import com.google.android.gms.maps.model.LatLngBounds.Builder;

import edu.purdue.app.R;
import edu.purdue.app.map.BuildingListDialog.OnBuildingSelectedListener;
import edu.purdue.app.map.GoogleMapFragment.GMapFragmentLoadedListener;
import edu.purdue.app.map.MapData.Building;
import edu.purdue.app.map.LayerListDialog.MapLayersUpdateListener;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.app.SearchManager;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Point;
import android.graphics.drawable.Drawable;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.widget.DrawerLayout;
import android.util.Log;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.SearchView;
import android.widget.Toast;

public class MapActivity extends Activity implements MapLayersUpdateListener {
	
	/** Logging tag for all Log.d output generated by the mapping segment of the program */
	public static String LOG_MAP_TAG = "PurdueApp-Map";
	
	/** Fragments for the UI */
	BuildingListDialog buildingFragment;
	GoogleMapFragment gmapFragment;
	
	/** Various class variables */
	GoogleMap gmap;
	
	/** This is defined statically so some other parts of the app don't have to instantiate their 
	 *  own MapData object, which can take quite a bit of time considering it re-parses the JSON. 
	 *  However, be careful about accessing this, because it is instantiated in onCreate(). I can't define
	 *  its instantiation statically because it requires access to Context. */
	public static MapData mpd;
	
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		
		// Log event
		Log.d(LOG_MAP_TAG, "MapActivity : onCreate() called.");
		
		// Set the content view with a google map fragment
		setContentView(R.layout.map_activity_main);
		
		// Create the fragments for the UI
		MapActivityEventListener eventListener = new MapActivityEventListener(this);
		gmapFragment = ((GoogleMapFragment) getFragmentManager().findFragmentById(R.id.map_fragment_googlemapfragment));
		gmapFragment.setGMapFragmentLoadedListener(eventListener);
		buildingFragment = new BuildingListDialog();
		buildingFragment.setOnBuildingSelectedListener(eventListener);
		
		// Prepare MapData
		mpd = new MapData(this);
		
		// Initialize the gms maps services
		try {
			MapsInitializer.initialize(this);
		} catch (GooglePlayServicesNotAvailableException e) {
			e.printStackTrace();
		}
	}
	
	/** Called when the user initializes a search */
	protected void onNewIntent(Intent i) {
		// Log event
		Log.d(MapActivity.LOG_MAP_TAG, "MapActivity : Intent intercepted : " + i.getAction());
		
		// Executed when the user manually enters a search term and hits enter
		if (Intent.ACTION_SEARCH.equals(i.getAction())) {
			
			String searchTerm = i.getStringExtra(SearchManager.QUERY);
			Log.d(MapActivity.LOG_MAP_TAG, "MapActivity : Manual search for item : " + searchTerm);
			search(searchTerm);
			
		}
		// Executed when the user selects a search result from the suggestions
		else if (Intent.ACTION_VIEW.equals(i.getAction())) {
			
			Building l = mpd.searchBuilding(i.getData().toString());
			Log.d(MapActivity.LOG_MAP_TAG, "MapActivity : Suggestion selected for item : " + l.full_name);
			gmapFragment.addPinToMap(new LatLng(l.lat, l.lng), l.full_name, true);
		
		}
		
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		MenuInflater inflater = this.getMenuInflater();
		inflater.inflate(R.menu.map_actionbarmenu, menu);
		
		// Makes the search button the action bar turn into a search box on click.
		SearchManager searchman = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
		SearchView sv = (SearchView) menu.findItem(R.id.map_actionbar_searchbuildings).getActionView();
		sv.setSearchableInfo(searchman.getSearchableInfo(getComponentName()));
	    sv.setIconifiedByDefault(false);
		
		return true;
	}

	/** Called when the user selects a button on the action bar or drop-donw settings menu */
	public boolean onOptionsItemSelected(MenuItem item) {
		switch (item.getItemId()) {
		case R.id.map_actionbar_listbuildings:
			buildingFragment.show(getFragmentManager(), "buildings");
			break;
		case R.id.map_actionbar_layers:
			LayerListDialog dialog = new LayerListDialog();
			dialog.setOnUpdateListener(this, this);
			dialog.show(getFragmentManager(), "layers");
			break;
		case R.id.map_actionbar_searchbuildings:
			
			break;
		}
		return super.onOptionsItemSelected(item);
	}
	
	/** Called when the user confirms layer selection in LayersDialog */
	public void onLayersUpdate(List<String> enabledLayers) {
		// Clear the map
		gmap.clear();
		
		// If no layers at all were selected, then reset the camera and return
		if (enabledLayers.size() == 0) {
			gmap.animateCamera(CameraUpdateFactory.newLatLngZoom(
					new LatLng(mpd.PURDUE_CENTER_LAT, mpd.PURDUE_CENTER_LNG),
					mpd.PURDUE_CAMPUS_ZOOM));
			return;
		}
		
		// Create a camera update bounds which will be updated as we add pins
		LatLngBounds.Builder latlngbuilder = LatLngBounds.builder();
		
		// The list of layers contains each layer the user has selected.
		// If the user selects multiple layers then they should be displayed simultaneously
		for (String i : enabledLayers) {
				
			for (LatLng loc : mpd.getLayerPoints(i)) {
				// Calculate the distance between the user's location and the pin (in meters)
				int dBetween = 0;
				if (gmap.getMyLocation() != null) {
					double dBetweenD = MapData.distanceBetween(gmap.getMyLocation().getLatitude(), 
							gmap.getMyLocation().getLongitude(), loc.latitude, loc.longitude) * 1000;
					// Cast it as an int to chop of the decimal as we really don't care about anything less than 1 meter
					dBetween = (int) dBetweenD;
				}
				
				// Create a new marker at that position with the title set as the distance
				gmap.addMarker(new MarkerOptions()
					.position(loc)
					.title("" + dBetween + " m"));
				latlngbuilder.include(loc);
			}
			
		}
		
		// Animate the camera so it includes all the new pins
		gmap.animateCamera(CameraUpdateFactory.newLatLngBounds(latlngbuilder.build(), 300));
	}
	
	/** Does a search on a given string and adds a pin to the map if it is found.
	 *  Does nothing if the search returned nothing. */
	private void search(String s) {
		// Do the search, which is in MapData
		Building result = mpd.searchBuilding(s);
		
		// The result is null if there are no results, so do nothing.
		if (result != null) {
			// Add a pin to the map and toast the full name of the building 
			gmapFragment.addPinToMap(new LatLng(result.lat, result.lng), result.full_name, true);
			Toast.makeText(this, result.full_name, Toast.LENGTH_SHORT).show();
		}

	}
		
}