AndroidGPS, Location Services, Camera and Sensorsparamvir.singh88@gmail.com

Today’s agenda

GPS and Location Services

Using Google Play Services

Camera

Sensors

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GPS and Location Services

How GPS Works

Global Positioning System (GPS) - mechanism to get location coordinates (latitude and longitude) by directly connecting to satellites.

GPS radio (Hardware) present in every smartphone.

When turned ON, GPS radio communicates with at least 3 satellites and tries to calculate its location.

Choose either COARSE or FINE location.

How GPS Works

Location Services in Android - Old Way

LocationManager

● Get last known location● Request frequent location updates - LocationListener

GeoCoder

● Get complete street address from geo coordinates● Get geo coordinates from street address

LocationListener

Two methods:

● onLocationChanged()● onStatusChanged()

Things to consider:

● Type of location provider● Minimum time interval for next update● Minimum distance covered before next update

Services - Demo

Using Google’s Location Services - The new way

“Provides same functionality and more in better and more efficient way using least battery.”

● Getting last known location● Receiving location updates● Displaying location address

Google Play Services

Google Play Games Services

Location APIs

Google+ APIs

Maps

Google Drive APIs

Google Wallet, Google Ads, Google Fit and many more..

Using Google Play Services for Location

Handling google API Client

Getting Location Updates

Create

Using Maps

Add Google Maps in app.

Show required location/address in map.

Draw Marker on map.

Zoom to a particular location.

Show address related information in map.

Using Maps

SupportMapFragment:

Using Maps - Other Important Classes

GoogleMap

LatLng

MarkerOptions

CameraUpdate

Demo

Sensors

Sensors in Android

To detect device movement: rotation, acceleration, orientation.

To detect environmental conditions: temperature or humidity.

● Motion sensors● Environment sensors● Position sensors

Motion & Position Sensors

Accelerometer

Gravity Sensor

Gyroscope

Rotation Sensor

Orientation Sensor

Magnetometer

Gyroscope

Sensors

Using Sensors in App

Working on every individual sensor separately is not required.

Many sensors are combined to form one sensor. E.g. Accelerometer, gyroscope and orientation sensors work together to give meaningful and usable values.

Access sensor available on device using “Sensor” class in Android.

● Determine which sensors are available● Retrieve raw sensor data● Register and unregister sensor event listeners

Using Sensors in App

Android Sensor Framework

SensorManager

Sensor

SensorEvent

SensorEventListener

Demo

Camera

Camera in Android

Take Picture or Record Video, apply filters, use in-built camera features.

Either built Camera feature in App from scratch using Framework classes:

● Android.hardware.camera2● Camera● SurfaceView● MediaRecorder

Or use Intent to open in-built camera app to take picture.

Using Intent to Open Camera App

Compose Camera Intent.

Start Camera Activity.

Receive clicked picture as a result from Intent.

Demo

Content Providers

Content Providers

A layer above stored data.

Hide how data is stored.

Used to share data between apps.

Provide Security to stored data.

Provide standard interface to access data easily.

Examples of In-built Content Providers

Calendar Provider

Contacts Provider

Browser History and bookmarks

User Dictionary

Call logs

Making Queries

Making Query - Using Cursor

Projection

Demo

Paramvir Singh

Android Architect and Trainer

paramvir.singh88@gmail.com

+91-9999703899