Context Aware Location

Nasrullah

Location Basics

• LocationManager—Class providing access to Android system location services

• LocationListener—Interface for receiving notifications from the LocationManager when the location has changed

• Location—Class representing a geographic location determined at a particular time

LocationManager (step 1)

• 1)LocationManager needs– to be initialized with Android System Location Service

This provides the application with the device’s current location,movement and can also alert when the device enters or leaves a defined area.

An example of initialization is LocationManager mLocationManager;mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

Location Manager(step 2)

• Location Provider needs to be Selected– Wifi– Gps

• Before that select the criteria for the provider

To find a proper location provider is to define the accuracy and power requirement. This enables the Android system to find the best available location technology for the specified requirements

Example step 2Criteria criteria = new Criteria();criteria.setAccuracy(Criteria.ACCURACY_FINE);criteria.setPowerRequirement(Criteria.POWER_LOW);

Step 2(Assign the Provider to the LocationManager Class;

String locationprovider = mLocationManager.getBestProvider(criteria, true);

LocationProviders

It is also possible to specify the location estimation technology using the location manager’s getProvider() method.

The two most common providers are the satellitebasedGlobal Positioning System (GPS) (specified by

LocationManager.GPS_PROVIDER)and cell-tower identification (specified by

LocationManager.NETWORK_PROVIDER. The former is more accurate, but the latter is useful

when a direct view of the sky is not available such as indoors

Adding Location Awareness

• Save chosen location on tasks• Adding an overlay that shows the device

current location• Using DDMS to mock locations• Displaying the current location co-ordinates

and accuracy• Filtering the Tasks by Location and Proximity

Location Based Services

• Brightkite• Foursquare• Gowolla• Latitude

User-stories

• Save Address on Task• See Current Location• Show only nearby Tasks

Cast of Characters• MyLocationOverlay – A simple mapoverlay that

show’s the device current location

• LocationManager – A system utility class that can report the device’s current location

• DDMS – Dalvik Debug and Monitoring Server .A suite of tools to debug and control an Android System

Step-one – Saving an Address on Task

How a SQLiteOpenHelper works

Saving an Address on a Task Steps

Have you used some sort of database migration feature ,such

as Rails ?

Step 2 –Displaying an Address on its Task

Displaying as Address Steps

Step-3 Adding Current Location to the Map

Mocking Location

Providing Mock Location Data

• As you develop your application, you'll certainly need to test how well your model for obtaining user location works. This is most easily done using a real Android-powered device. If, however, you don't have a device, you can still test your location-based features by mocking location data in the Android emulator. There are three different ways to send your application mock location data: using Eclipse, DDMS, or the "geo" command in the emulator console (copied from)

• http://developer.android.com/guide/topics/location/strategies.html

Adding a Location to the map Steps

Step 4-Displaying a Current Location

Displaying Current Location Steps