# @ohos.bluetooth.a2dp (Bluetooth A2DP Module)

The **a2dp** module provides APIs for using the Bluetooth Advanced Audio Distribution Profile (A2DP), which defines how to stream high quality audio from one device to another over a Bluetooth connection.

> **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

```js
import a2dp from '@ohos.bluetooth.a2dp';
```

## a2dp.createA2dpSrcProfile<a name="createA2dpSrcProfile"></a>

createA2dpSrcProfile(): A2dpSourceProfile

Creates an **A2dpSrcProfile** instance.

**System capability**: SystemCapability.Communication.Bluetooth.Core

**Return value**

| Type                           | Description        |
| ----------------------------- | ---------- |
| A2dpSourceProfile | **A2dpSrcProfile** instance created.|

**Example**

```js
import { BusinessError } from '@ohos.base';
try {
    let a2dpProfile = a2dp.createA2dpSrcProfile();
    console.info('a2dp success');
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}
```


## A2dpSourceProfile

Provides APIs for using the A2DP. Before using any API of **A2dpSourceProfile**, you need to create an instance of this class by using **createA2dpSrcProfile()**.


### connect<a name="a2dp-connect"></a>

connect(deviceId: string): void

Connects to an A2DP device.

**System API**: This is a system API.

**Required permissions**: ohos.permission.ACCESS_BLUETOOTH

**System capability**: SystemCapability.Communication.Bluetooth.Core

**Parameters**

| Name   | Type    | Mandatory  | Description     |
| ------ | ------ | ---- | ------- |
| deviceId | string | Yes   | Address of the device to connect. |

**Error codes**

For details about the error codes, see [Bluetooth Error Codes](../errorcodes/errorcode-bluetoothManager.md).

| ID| Error Message|
| -------- | ---------------------------- |
|2900001 | Service stopped.               |
|2900003 | Bluetooth switch is off.       |
|2900004 | Profile is not supported.      |
|2900099 | Operation failed.              |

**Example**

```js
import { BusinessError } from '@ohos.base';
try {
    let a2dpSrc = a2dp.createA2dpSrcProfile();
    a2dpSrc.connect('XX:XX:XX:XX:XX:XX');
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}
```


### disconnect<a name="a2dp-disconnect"></a>

disconnect(deviceId: string): void

Disconnects from an A2DP device.

**System API**: This is a system API.

**Required permissions**: ohos.permission.ACCESS_BLUETOOTH

**System capability**: SystemCapability.Communication.Bluetooth.Core

**Parameters**

| Name   | Type    | Mandatory  | Description     |
| ------ | ------ | ---- | ------- |
| deviceId | string | Yes   | Address of the device to disconnect. |

**Error codes**

For details about the error codes, see [Bluetooth Error Codes](../errorcodes/errorcode-bluetoothManager.md).

| ID| Error Message|
| -------- | ---------------------------- |
|2900001 | Service stopped.                         |
|2900003 | Bluetooth switch is off.                 |
|2900004 | Profile is not supported.                |
|2900099 | Operation failed.                        |

**Example**

```js
import { BusinessError } from '@ohos.base';
try {
    let a2dpSrc = a2dp.createA2dpSrcProfile();
    a2dpSrc.disconnect('XX:XX:XX:XX:XX:XX');
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}
```


### getPlayingState

getPlayingState(deviceId: string): PlayingState

Obtains the playing state of a device.

**Required permissions**: ohos.permission.ACCESS_BLUETOOTH

**System capability**: SystemCapability.Communication.Bluetooth.Core

**Parameters**

| Name   | Type    | Mandatory  | Description     |
| ------ | ------ | ---- | ------- |
| device | string | Yes   | Address of the remote device.|

**Return value**

| Type                           | Description        |
| ----------------------------- | ---------- |
| [PlayingState](#PlayingState) | Playing state of the remote device obtained.|

**Error codes**

For details about the error codes, see [Bluetooth Error Codes](../errorcodes/errorcode-bluetoothManager.md).

| ID| Error Message|
| -------- | ---------------------------- |
|2900001 | Service stopped.                         |
|2900003 | Bluetooth switch is off.                 |
|2900004 | Profile is not supported.                |
|2900099 | Operation failed.                        |

**Example**

```js
import { BusinessError } from '@ohos.base';
try {
    let a2dpSrc = a2dp.createA2dpSrcProfile();
    let state = a2dpSrc.getPlayingState('XX:XX:XX:XX:XX:XX');
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}
```

## PlayingState<a name="PlayingState"></a>

Enumerates the A2DP playing states.

**System capability**: SystemCapability.Communication.Bluetooth.Core

| Name               | Value   | Description     |
| ----------------- | ------ | ------- |
| STATE_NOT_PLAYING | 0x0000 | Not playing. |
| STATE_PLAYING     | 0x0001 | Playing.|