Mobile Application Development Google Maps Android API v2

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1 Mobile Application Development Google Maps Android API v2 Waterford Institute of Technology November 5, 2014 John Fitzgerald Waterford Institute of Technology, Mobile Application Development Google Maps Android API v2 1/15

John Fitzgerald Waterford Institute of Technology, v2

API features Google Maps Android API Embed & display map Access Google Map servers Download map data Add markers, polygons, overlays Change zoom level

2 API features Google Maps Android API Embed & display map Access Google Map servers Download map data Add markers, polygons, overlays Change zoom level Determine geolocation Select map type (normal, hybrid... ) Waterford Institute of Technology, Mobile Application Development Google Maps Android API v2 2/15

Determine geolocation Select map type (normal, hybrid.

3 Preparatory work Google Play Services Install via Android SDK Manager Import to MyRent workspace Reference in manifest file Reference in MyRent properties Waterford Institute of Technology, Mobile Application Development Google Maps Android API v2 3/15

Reference in MyRent properties Waterford Institute of

4 Maps API key Generating & using key Each app requires key Key obtainable at Google API console Must be registered user Generate key Add key to manifest Switch on API v2 in console Waterford Institute of Technology, Mobile Application Development Google Maps Android API v2 4/15

Add key to manifest Switch on API v2 in console Waterford Institute

5 Geolocation LatLng stores map data Units are degrees Ranges: Longitude: 0 to +/- 180 Latitude: 0 to +/- 90 One degree (metres) latitude approx 111 longitude same at equator zero at poles Accuracy decimal places: Four: 11 m (Garmin 15 m) Six: 11 cm Seven: 11 mm Waterford Institute of Technology, Mobile Application Development Google Maps Android API v2 5/15

zero at poles Accuracy decimal places: Four: 11 m (Garmin 15 m) Six: 11 cm Seven: 11 mm

6 Helpers Data input and manipulation Geolocation data input as String Necessary convert to & from Android LatLng public static LatLng latlng(context context, String geolocation) { String[] g = geolocation.split(","); return new LatLng(Double.parseDouble(g[0]), Double.parseDouble(g[1])); } public static String latlng(latlng geo) { return String.format("%.6f", geo.latitude) + ", " + String.format("%.6f", % geo.longitude); } Waterford Institute of Technology, Mobile Application Development Google Maps Android API v2 6/15

parseDouble(g[0]), Double.parseDouble(g[1])); } public static String latlng(latlng geo) { return String.format("%.6f", geo.

7 Modify manifest file Add permissions Add API key Waterford Institute of Technology, Mobile Application Development Google Maps Android API v2 7/15

8 Fields added to Waterford Institute of Technology, Mobile Application Development Google Maps Android API v2 8/15

9 Initialize map fragment in onactivitycreated Waterford Institute of Technology, Mobile Application Development Google Maps Android API v2 9/15

10 Implement interfaces Waterford Institute of Technology, Mobile Application Development Google Maps Android API v2 10/15

11 OnMarkerDragListener Three methods to implement Fully implement only onmarkerdragend Waterford Institute of Technology, Mobile Application Development Google Maps Android API v2 11/15

12 OnCameraChangeListener Triggered by pan, zoom... Waterford Institute of Technology, Mobile Application Development Google Maps Android API v2 12/15

13 Initialize Map when fragment starts Invoke in onstart Register marker & camera listeners Set map type (e.g. Hybrid, Terrain) Display map Waterford Institute of Technology, Mobile Application Development Google Maps Android API v2 13/15

Hybrid, Terrain) Display map Waterford Institute of

14 Update Map When geolocation changed manually (aftertextchanged) Boolean flag used to distinguish manual geolocation changes and those caused by dragging marker. Waterford Institute of Technology, Mobile Application Development Google Maps Android API v2 14/15

15 Geolodation data input Validation introduced in MapHelper.latlng Disallows invalid geolocation try-catch block used Waterford Institute of Technology, Mobile Application Development Google Maps Android API v2 15/15

Android Maps Tutorial

Android Maps Tutorial Introduction: Using Google Maps API In this project, we are going to create a project that will show a user inputted address on a Google map. The main Activity will contain an area