Bluetooth overview #Bluetooth

 Bluetooth outline


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The Android Bluetooth stage incorporates support for the Bluetooth network stack, which permits a gadget to remotely trade information with other Bluetooth gadgets. The application structure gives admittance to the Bluetooth usefulness through Bluetooth APIs. These APIs let applications associate with other Bluetooth gadgets, empowering highlight point and multipoint remote elements.


An app can use the Bluetooth APIs to do the following:


  • Examine for other Bluetooth gadgets.
  • Inquiry the nearby Bluetooth connector for matched Bluetooth gadgets.
  • Lay out RFCOMM channels.
  • Interface with different gadgets through help revelation.
  • Move information to and from different gadgets.
  • Deal with various associations.

Classic Bluetooth is the focus of this subject. Exemplary Bluetooth is the ideal decision for more battery-escalated tasks, which incorporate streaming and imparting between gadgets. Consider using Bluetooth Low Energy connections for low-power Bluetooth devices.


This documentation portrays different Bluetooth profiles and clarifies how for utilize the Bluetooth APIs to achieve the four significant undertakings important to impart utilizing Bluetooth:


  • Setting up Bluetooth.
  • Finding gadgets that are either matched or accessible in the neighborhood.
  • tying devices together.
  • Moving information between gadgets.
  • For a showing of utilizing the Bluetooth APIs, see the Bluetooth Talk test application.


The rudiments

For Bluetooth-empowered gadgets to send information between one another, they should initially shape a channel of correspondence utilizing a matching interaction. One gadget, a discoverable gadget, makes itself accessible for approaching association demands. Using a service discovery process, another device locates the discoverable device. The two devices exchange security keys during a bonding process after the discoverable device accepts the pairing request. The gadgets store these keys for sometime in the future. After the matching and holding processes are finished, the two gadgets trade data. At the point when the meeting is finished, the gadget that started the matching solicitation delivers the channel that had connected it to the discoverable gadget. The two gadgets remain reinforced, nonetheless, so they can reconnect naturally during a future meeting for however long they're in scope of one another and neither one of the gadgets has taken out the bond.


Declaring multiple permissions in your manifest file is necessary for using the Bluetooth APIs. Once your application has authorization to utilize Bluetooth, your application needs to get to the BluetoothAdapter and decide whether Bluetooth is accessible on the gadget. To connect if Bluetooth is available, there are three steps:


  • Locate nearby Bluetooth devices, either existing or brand-new ones.
  • Interface with a Bluetooth gadget.
  • Utilize the connected device to transfer data.
  • A specific Bluetooth profile that specifies the data it provides is used by certain devices.


The android.bluetooth package contains all of the Bluetooth APIs. Key classes and interfaces Coming up next are the classes and connection points you want to make Bluetooth associations:


The local Bluetooth adapter, or Bluetooth radio, is represented by BluetoothAdapter. The point of entry for all Bluetooth interactions is the BluetoothAdapter. You can use this to create a BluetoothServerSocket to listen for communications from other devices, instantiate a BluetoothDevice with a known MAC address, query a list of bonded (paired) devices, and discover other Bluetooth devices.

A remote Bluetooth device is represented by BluetoothDevice. Request a BluetoothSocket connection with a remote device or inquire about the device's name, address, class, and bonding state with this.

BluetoothSocket

Addresses the point of interaction for a Bluetooth attachment (like a TCP Attachment). An app can use InputStream and OutputStream to exchange data with another Bluetooth device at this connection point.

BluetoothServerSocket

Addresses an open server attachment that tunes in for approaching solicitations (like a TCP ServerSocket). One device must use this class to open a server socket in order to connect two devices. This device accepts a connection request from a remote Bluetooth device, returns a connected BluetoothSocket, and the process continues when the remote Bluetooth device disconnects.

BluetoothClass

Portrays the overall qualities and capacities of a Bluetooth gadget. This is a perused just arrangement of properties that characterizes the gadget's classes and administrations. Albeit this data gives a valuable clue in regards to a gadget's sort, the characteristics of this class don't be guaranteed to depict all Bluetooth profiles and administrations that the gadget upholds.

A Bluetooth profile-representative interface is called a BluetoothProfile. A Bluetooth profile is a remote connection point particular for Bluetooth-based correspondence between gadgets. A model is the Sans hands profile. Profiles are discussed in greater detail in Bluetooth profiles.

BluetoothHeadset makes it possible to use Bluetooth headsets with mobile phones. This incorporates both the Bluetooth Headset profile and the Sans hands (v1.5) profile.

Using the Advanced Audio Distribution Profile (A2DP), high-quality audio can be streamed from one device to another over a Bluetooth connection using BluetoothA2dp.

BluetoothHealth

Addresses a Wellbeing Gadget Profile intermediary that controls the Bluetooth administration.

BluetoothHealthCallback

A theoretical class that you use to carry out BluetoothHealth callbacks. To receive notifications of changes to the Bluetooth channel state and the app's registration state, you must extend this class and implement the callback methods.

The Bluetooth Health third-party app registers a Bluetooth HealthAppConfiguration in order to communicate with a remote Bluetooth health device.

BluetoothProfile. ServiceListener

A point of interaction that tells BluetoothProfile interprocess correspondence (IPC) clients when they have been associated with or disengaged from the inside help that runs a specific profile.


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