20 Android Bluetooth Interview Questions and Answers

Android Bluetooth is a popular wireless technology that allows devices to connect and exchange data. If you are applying for a position that involves developing Android applications, it is likely that you will be asked questions about Bluetooth during your interview. Knowing how to properly answer these questions can help you impress the hiring manager and improve your chances of getting the job. In this article, we discuss the most commonly asked Android Bluetooth questions and how you should respond.

Android Bluetooth Interview Questions and Answers

Here are 20 commonly asked Android Bluetooth interview questions and answers to prepare you for your interview:

1. What is Bluetooth?

Bluetooth is a wireless technology standard for exchanging data over short distances (typically less than 30 feet). Bluetooth is a popular choice for connecting devices such as headphones, speakers, and keyboards to phones, laptops, and tablets.

2. What are the different types of Bluetooth profiles?

The different types of Bluetooth profiles are:

-A2DP: Advanced Audio Distribution Profile
-AVRCP: Audio/Video Remote Control Profile
-GAP: Generic Access Profile
-GATT: Generic Attribute Profile
-HFP: Hands-Free Profile
-HID: Human Interface Device Profile
-MAP: Message Access Profile
-OBEX: Object Exchange Profile
-PAN: Personal Area Network Profile
-SPP: Serial Port Profile

3. Can you explain how Bluetooth works in Android?

Bluetooth in Android works by allowing two Android devices to connect to each other and share data. To do this, each device must have Bluetooth turned on and be in range of the other device. Once the two devices are connected, they can share data such as photos, files, and even apps.

4. What do you understand about a Bluetooth permission model?

The Bluetooth permission model is a set of rules that govern how applications can interact with Bluetooth devices. These rules are designed to protect users’ privacy and security, and to ensure that only authorized applications can access Bluetooth features.

5. What are some best practices for working with Bluetooth on Android?

Some best practices for working with Bluetooth on Android include:
-Pairing devices only when necessary, and unpairing them when you’re finished
-Keeping the Bluetooth radio turned off when not in use, in order to conserve battery
-Using Bluetooth sparingly in public places, as it can be a security risk
-Making sure to keep your Android device updated with the latest security patches

6. How can I make my device discoverable to other devices using Bluetooth?

To make your device discoverable to other devices using Bluetooth, you will need to enable Bluetooth on your device and then set your device to be discoverable. You can do this by going into the Bluetooth settings on your device and turning on the option to make your device discoverable.

7. Is it possible for an Android app to pair two phones over Bluetooth? If yes, then how?

Yes, it is possible for an Android app to pair two phones over Bluetooth. To do this, the app would need to use the Bluetooth API to scan for nearby devices, and then pair with the desired device.

8. What’s the difference between classic and low energy Bluetooth?

Classic Bluetooth is the original Bluetooth standard, which is designed for short-range wireless communication between devices. Low energy Bluetooth is a more recent addition to the Bluetooth standard, which is designed for devices that need to communicate wirelessly but don’t need to use a lot of power, such as fitness trackers and heart rate monitors.

9. What is SDP? What purpose does it serve?

SDP is the service discovery protocol. It is used to help devices find each other and to determine what services they are able to offer to each other.

10. What is Bonjour and what’s its usage?

Bonjour is a software program that helps devices connect to each other on a local network. It’s often used on devices like printers or scanners, so that they can be easily found and used by other devices on the same network.

11. What is RFCOMM?

RFCOMM is a protocol that allows for serial communication over Bluetooth. It is typically used for things like sending and receiving data over a Bluetooth connection.

12. What do you know about Service Discovery Protocol (SDP)?

Service Discovery Protocol is a Bluetooth profile that is used to discover services offered by a Bluetooth device. It is typically used by devices that want to connect to each other and exchange data.

13. What is the primary use case for Bluetooth Classic?

The primary use case for Bluetooth Classic is for short-range wireless communication between devices. This can be used for a variety of purposes, such as transferring files between devices, connecting devices for audio streaming, or setting up a wireless connection for a keyboard or mouse.

14. Is it possible to create a chat application or file transfer application using Bluetooth Classic? If yes, what protocols would you recommend?

Yes, it is possible to create a chat application or file transfer application using Bluetooth Classic. For a chat application, you would want to use the RFCOMM protocol, and for file transfer you would want to use the OBEX protocol.

15. Do all devices support Bluetooth LE? Which ones don’t?

No, not all devices support Bluetooth LE. Some older devices may not have the hardware necessary to support it, and some newer devices may have chosen to not include it for one reason or another.

16. What are some examples of Bluetooth LE-enabled hardware?

Some examples of Bluetooth LE-enabled hardware include the following:

-Smartphones
-Tablets
-Laptops
-Computers
-Watches
-Fitness trackers
-Heart rate monitors
-Blood pressure monitors
-Thermometers
-Glucose monitors
-Proximity sensors
-Security systems
-Automobiles

17. How many simultaneous connections can be made by a single BLE-enabled device?

A single BLE-enabled device can make up to 8 simultaneous connections.

18. In which situations should we avoid using Bluetooth?

There are a few situations in which you might want to avoid using Bluetooth. One is if you are trying to conserve battery life, since Bluetooth can be a power-hungry feature. Another is if you are dealing with sensitive data, since Bluetooth connections are relatively easy to hack. Finally, if you are in an area with a lot of electromagnetic interference, Bluetooth can be more prone to dropouts and other problems.

19. How much power does Bluetooth drain from your phone battery?

Bluetooth drains very little power from your phone battery. In fact, most people don’t even notice a difference in their battery life when they have Bluetooth turned on.

20. What is GATT and how does it relate to BLE?

GATT is the Generic Attribute Profile, and it defines the way that two Bluetooth Low Energy devices transfer data back and forth using attributes. Each attribute is a piece of data that can be read or written by one of the devices. To read or write an attribute, one of the devices needs to know the handle of the attribute, which is a unique identifier.