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Maps

Dr. David Janzen

Except as otherwise noted, the content of this presentation is

licensed under the Creative Commons Attribution 2.5 License.

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Maps

Google Maps API is

widely used on the web

The Android SDK

provides support for easily

integrating the Google

Maps API

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Using Google Maps in our apps

Configure

Maps require the Google API as the projectbuild target

Maps require a Map API Key in order to bedeployed

http://code.google.com/android/add-

ons/google-apis/maps-overview.html Code

Create a MapView in a MapActivity

Create Map Overlays

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Add Google API in Eclipsehttp://developer.android.com/sdk/adding-components.html

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Add Google API in Eclipse

Use API 4 for SDK 1.6http://developer.android.com/guide/appendix/api-levels.html

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Add Google API in Eclipse

Set the Google API as the Project Build Target Right-click on the project, select Properties

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Keys

As we learned in lab 1 section 6,https://sites.google.com/site/androidappcourse/labs/lab-1

our apps must be signed in order to deploy them on

a device Eclipse automatically creates a signed debug

keystore that is used when launching our app fromEclipse

In order to deploy our app to the public, we mustcreate a signed keystoreSee http://developer.android.com/guide/publishing/app-

signing.html#ExportWizard

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Find your keystorehttp://code.google.com/android/add-ons/google-apis/mapkey.html

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Find your debug keystorehttp://code.google.com/android/add-ons/google-apis/mapkey.html

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Get your certificate fingerprinthttp://code.google.com/android/add-ons/google-apis/mapkey.html

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Register your certificate with Google

http://code.google.com/android/maps-api-signup.html

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Whats in the legal agreement?

Read the Terms of Service (sections 1-11)

http://code.google.com/android/maps-api-

signup.html

Examples

Maps may include ads in future

Google may limit number of transactions

Cannot use for turn-by-turn directions or

autonomous driving

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Add the Map API Key to your Application

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Configure AndroidManifest.xml

...

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Finally, we can start coding

MapView

Contains a map

via Google Maps API

Map tile retrieval and caching is

all done for you

Includes pan

Includes zoom

use setBuiltInZoomControls(true);

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MapView Modes

MapView

You determine mode

setSatellite(true);

setTraffic(true);

setStreetView(true);

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MapActivity

MapView can only be constructed or

inflated in a MapActivity

public class MyActivity extends MapActivity {

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

MapView myMap = (MapView)findViewById(R.id.myMap);

myMap.setBuiltInZoomControls();

myMap.setSatellite(true);

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MapController

You can pan and zoom the map

programmatically

MapView myMap = (MapView)findViewById(R.id.myMap);

MapController mapController = myMap.getController();

mapController.setZoom(1); //widest zoom/far away

mapController.setZoom(21); //narrowest zoom/close inmapController.zoomIn(); //one level

mapController.zoomOut(); //one level

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GeoPoint

You can move to a particular point

MapView myMap = (MapView)findViewById(R.id.myMap);MapController mapController = myMap.getController();

Double lat = 37.123456 * 1E6;

Double long = -122.123456 * 1E6;GeoPoint point = new GeoPoint(lat.intValue(), long.intValue());

mapController.setCenter(point); //jump to point

mapController.animateTo(point); //smooth transition to point

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Reverse Geocoding

Find address from longitude/latitude

location = locationManager.getLastKnownLocation(

LocationManager.GPS_PROVIDER);double lat = location.getLatitude();

double lng = location.getLongitude();

Geocoder gc = new Geocoder(this, Locale.getDefault());List addresses = null;

try {

addresses = gc.getFromLocation(lat, lng, 10);

} catch (IOException e) {}

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Forward Geocoding

Find longitude/latitude (and more) from address

Geocoder gc = new Geocoder(this, Locale.US);List addresses = null;

try {

addresses = gc.getFromLocationName(

123 Main St., Newton, Kansas, 10);} catch (IOException e) {}

double lat = addresses.get(0).getLatitude();

String zip = addresses.get(0).getPostalCode();

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Geolocation

Options

GPS, cell network

Wifi-based

Skyhook Wireless

http://www.skyhookwireless.com/developers/

Android_Integration_Manual.php

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Setting up location servicespublic MyActivity() {

criteria = new Criteria();

criteria.setAccuracy(Criteria.ACCURACY_FINE);

criteria.setAltitudeRequired(false);

criteria.setBearingRequired(false);

criteria.setCostAllowed(true);

criteria.setPowerRequirement(Criteria.POWER_LOW);

};

private final LocationListener locationListener = new LocationListener() {

public void onLocationChanged(Location location) {

updateWithNewLocation(location);

}

public void onProviderDisabled(String provider) {

updateWithNewLocation(null);

}

public void onProviderEnabled(String provider) {}

public void onStatusChanged(String provider, int status, Bundle extras) {}

};

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@Override

protected void onStart() {

super.onStart();

locationManager = (LocationManager)getSystemService(

Context.LOCATION_SERVICE);

provider = locationManager.getBestProvider(criteria, true);

// or could be LocationManager.GPS_PROVIDER

try {

updateWithNewLocation(locationManager.getLastKnownLocation(provider));

} catch (Exception e) {}

locationManager.requestLocationUpdates(provider, 2000, 10,

locationListener);

}

private void updateWithNewLocation(Location location) {double latitude = 0.0;

double longitude = 0.0;

if (location != null) {

latitude = location.getLatitude();

longitude = location.getLongitude();

//do something with latitude and longitude (e.g. print or move map there)}

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Turn GPS on and off to save battery

@Override

protected void onPause() {super.onPause();

//stop receiving GPS

locationManager.removeUpdates(locationListener);

}

@Override

protected void onResume() {super.onResume();

//restart receiving GPS

locationManager.requestLocationUpdates(provider, 2000, 10,

locationListener);

}