harmony 鸿蒙@ohos.bluetooth.access (Bluetooth Access Module)

2023-10-30
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@ohos.bluetooth.access (Bluetooth Access Module)

The access module provides APIs for enabling and disabling Bluetooth and obtaining the Bluetooth status.

NOTE

The initial APIs of this module are supported since API version 10. Newly added APIs will be marked with a superscript to indicate their earliest API version.

Modules to Import

import access from '@ohos.bluetooth.access';

access.enableBluetooth

enableBluetooth(): void

Enables Bluetooth.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Error codes

For details about the error codes, see Bluetooth Error Codes.

ID	Error Message
2900001	Service stopped.
2900099	Operation failed.

Example

import { BusinessError } from '@ohos.base';
try {
    access.enableBluetooth();
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

access.disableBluetooth

disableBluetooth(): void

Disables Bluetooth.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Error codes

For details about the error codes, see Bluetooth Error Codes.

ID	Error Message
2900001	Service stopped.
2900099	Operation failed.

Example

import { BusinessError } from '@ohos.base';
try {
    access.disableBluetooth();
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

access.getState

getState(): BluetoothState

Obtains the Bluetooth state.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Return value

Type	Description
BluetoothState	Bluetooth state obtained.

Error codes

For details about the error codes, see Bluetooth Error Codes.

ID	Error Message
2900001	Service stopped.
2900099	Operation failed.

Example

import { BusinessError } from '@ohos.base';
try {
    let state = access.getState();
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

access.on(‘stateChange’)

on(type: “stateChange”, callback: Callback<BluetoothState>): void

Subscribes to Bluetooth state changes.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is stateChange, which indicates a Bluetooth state change event.
callback	Callback<BluetoothState>	Yes	Callback invoked to return the Bluetooth state. You need to implement this callback.

Error codes

For details about the error codes, see Bluetooth Error Codes.

ID	Error Message
2900099	Operation failed.

Example

import { BusinessError } from '@ohos.base';
function onReceiveEvent(data: access.BluetoothState) {
    console.info('bluetooth state = '+ JSON.stringify(data));
}
try {
    access.on('stateChange', onReceiveEvent);
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

access.off(‘stateChange’)

off(type: “stateChange”, callback?: Callback<BluetoothState>): void

Unsubscribes from Bluetooth state changes.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is stateChange, which indicates a Bluetooth state change event.
callback	Callback<BluetoothState>	No	Callback for the Bluetooth state change event. If this parameter is not set, this API unsubscribes from all callbacks corresponding to type.

Error codes

For details about the error codes, see Bluetooth Error Codes.

ID	Error Message
2900099	Operation failed.

Example

import { BusinessError } from '@ohos.base';
function onReceiveEvent(data: access.BluetoothState) {
    console.info('bluetooth state = '+ JSON.stringify(data));
}
try {
    access.on('stateChange', onReceiveEvent);
    access.off('stateChange', onReceiveEvent);
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

BluetoothState

Enumerates the Bluetooth states.

System capability: SystemCapability.Communication.Bluetooth.Core

Name	Value	Description
STATE_OFF	0	Bluetooth is turned off.
STATE_TURNING_ON	1	Bluetooth is being turned on.
STATE_ON	2	Bluetooth is turned on.
STATE_TURNING_OFF	3	Bluetooth is being turned off.
STATE_BLE_TURNING_ON	4	The LE-only mode is being turned on for Bluetooth.
STATE_BLE_ON	5	Bluetooth is in LE-only mode.
STATE_BLE_TURNING_OFF	6	The LE-only mode is being turned off for Bluetooth.