CSIT242 Mobile Application Development Lecture 6 & 1 Quiz

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Questions and Answers

What permission must be declared in the app's manifest file for an Android app targeting Android 10 or higher to receive regular location updates while in the background?

ACCESS_LOCATION_UPDATES

ACCESS_BACKGROUND_LOCATION (correct)

ACCESS_COARSE_LOCATION

ACCESS_FINE_LOCATION

If an Android app does not need location access while running in the background, what is recommended regarding the ACCESS_BACKGROUND_LOCATION permission?

It is highly recommended not to request it (correct)

It should be requested but not enforced

It must be requested anyway

It should be requested only if using high accuracy location

For an Android app to retrieve the last known location of the device, which API can be used?

Google Play services Maps API

Google Play services Location APIs (correct)

Google Play services Authentication API

Google Play services Ads API

How can an Android app retrieve the device's last known location using the Fused Location Provider Client?

Use getLastLocation() method on the fusedLocationClient object Signup and view all the answers

What determines the precision of the location returned by the getLastLocation() method in an Android app?

The permission setting in the app's manifest file Signup and view all the answers

Which API manages the underlying location technology and provides a simple interface to specify requirements such as high accuracy or low power in an Android app?

Fused Location Provider API Signup and view all the answers

Which class in the Android sensor framework is used to create an instance of the sensor service?

SensorManager Signup and view all the answers

What type of data do motion sensors in Android measure primarily?

Device movement Signup and view all the answers

What is the category of sensors in Android that includes barometers, photometers, and thermometers?

Environmental sensors Signup and view all the answers

Which type of sensor can be both hardware-based and software-based in Android?

Orientation sensor Signup and view all the answers

What is the purpose of the android.hardware package in Android?

To provide sensor-related classes and interfaces Signup and view all the answers

How can developers ensure that a specific sensor is present on an Android device?

By targeting devices with specific sensor configurations using Google Play filters Signup and view all the answers

Which type of sensor in Android provides data based on direct user input or the physical environment?

Motion sensors Signup and view all the answers

What is the purpose of a permission in Android?

To protect the privacy of an Android user Signup and view all the answers

What type of permissions are granted automatically at install time in Android?

Install-time permissions Signup and view all the answers

Which type of permissions in Android require the user's explicit approval at runtime?

Run-time (Dangerous) permissions Signup and view all the answers

What do Signature permissions in Android grant access to?

An app signed by the same certificate as the OS defining the permission Signup and view all the answers

Which method should be used to check if a permission is granted before performing an operation in an Android app?

checkSelfPermission() Signup and view all the answers

What does shouldShowRequestPermissionRationale() return in Android?

A boolean indicating previous user denial or 'Don't ask again' selection Signup and view all the answers

Which API provides simplified and higher accuracy location services in Android?

Google Location Services API Signup and view all the answers

What kind of permissions must apps request in Android if they use location services?

<code>ACCESS_COARSE_LOCATION</code>, <code>ACCESS_FINE_LOCATION</code>, <code>ACCESS_BACKGROUND_LOCATION</code> Signup and view all the answers

What is Reverse-geocoding in Android?

Converting geographical coordinates into human-readable addresses Signup and view all the answers

What is the main component of the location framework in Android?

LocationManager system service Signup and view all the answers

Study Notes

Android Location and Sensor Permissions

To receive regular location updates while in the background, an Android app targeting Android 10 or higher must declare the ACCESS_BACKGROUND_LOCATION permission in the app's manifest file.
If an Android app does not need location access while running in the background, it is recommended to not declare the ACCESS_BACKGROUND_LOCATION permission.

Retrieving Last Known Location

To retrieve the last known location of the device, an Android app can use the Fused Location Provider Client API.
The device's last known location can be retrieved using the getLastLocation() method of the Fused Location Provider Client.
The precision of the location returned by the getLastLocation() method is determined by the availability of location providers and the device's hardware capabilities.

Location and Sensor APIs

The Fused Location Provider Client API manages the underlying location technology and provides a simple interface to specify requirements such as high accuracy or low power.
The SensorManager class in the Android sensor framework is used to create an instance of the sensor service.

Sensors in Android

Motion sensors in Android measure primarily acceleration, orientation, and angular velocity.
Environmental sensors in Android include barometers, photometers, and thermometers.
Some sensors, such as the fingerprint sensor, can be both hardware-based and software-based.
The android.hardware package provides APIs for accessing various hardware components, including sensors.

Sensor Permissions and Access

To ensure that a specific sensor is present on an Android device, developers can use the hasSystemFeature() method.
The purpose of a permission in Android is to protect sensitive user data and system resources.
Normal permissions are granted automatically at install time in Android.
Dangerous permissions require the user's explicit approval at runtime.
Signature permissions grant access to sensitive system resources and are only granted to apps signed with the same certificate as the system image.

Requesting Permissions

The checkSelfPermission() method should be used to check if a permission is granted before performing an operation in an Android app.
The shouldShowRequestPermissionRationale() method returns true if the app should show a rational for why the permission is needed, and false otherwise.

Location Services

The Fused Location Provider Client API provides simplified and higher accuracy location services in Android.
Apps that use location services must request the ACCESS_FINE_LOCATION or ACCESS_COARSE_LOCATION permission.
Reverse-geocoding in Android is the process of converting a latitude and longitude into a human-readable address.
The main component of the location framework in Android is the Location Manager.

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Description

Test your knowledge on topics covered in CSIT242 Mobile Application Development Lecture 6 and SIM 2024 Lecture Plan. Includes Android location & Google Map API, supported sensors, iOS location & maps, iOS sensors, requesting runtime permissions on Android, and purpose of permissions.

CSIT242 Mobile Application Development Lecture 6 &amp; 1 Quiz

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