# Add video capability to the Contact Center SDK for Android

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After initializing the SDK, call the `getZoomCCVideoService` (Java) or `zoomCCVideoService` (Kotlin) function to get `ZoomCCVideoService` and initialize it with the chat entry ID. Then call `fetchUI` to open the `WaitingRoom` view.

## Show video from the requesting server

```java
ZoomCCChatService service = ZoomCCInterface.INSTANCE.getZoomCCVideoService();
service.init("VideoEntryId");
service.fetchUI();
```

```kotlin
val service = ZoomCCInterface.INSTANCE.zoomCCVideoService
service.init("VideoEntryId")
service.fetchUI()
```

## End video

```java
ZoomCCChatService service = ZoomCCInterface.INSTANCE.getZoomCCChatService();
service.endVideo();
```

```kotlin
val service = ZoomCCInterface.INSTANCE.zoomCCVideoService
service.endVideo()
```

### Log off of the service

If you don't want to receive further callbacks from the SDK, call `logoff()`.

```java
ZoomCCVideoService videoService = ZoomCCInterface.INSTANCE.getZoomCCVideoService();
videoService.logoff();
```

```kotlin
var videoService = ZoomCCInterface.INSTANCE.zoomCCVideoService
videoService.logoff()
```

### Release SDK resources

To release SDK resources, call `releaseZoomCCService` in `onDestroy()`.

```java
protected void onDestroy() {
ZoomCCInterface.INSTANCE.releaseZoomCCService("VideoEntryId");
super.onDestroy();
}
```

```kotlin
override fun onDestroy() {
ZoomCCInterface.INSTANCE.releaseZoomCCService("VideoEntryId")
super.onDestroy()
}
```

## Forcibly end an active video engagement

To forcibly end a video engagement, use the endVideo method. This action closes the video view and releases any associated service instances within the Contact Center SDK.

```java
ZoomCCChatService service = ZoomCCInterface.INSTANCE.getZoomCCChatService();
service.endVideo();
```

```kotlin
val service = ZoomCCInterface.INSTANCE.zoomCCVideoService
service.endVideo()
```

## Callbacks

These callbacks are available for both chat and video.

Implement listeners and see the available callback functions.

### Implement a listener

To subscribe to these events, define your own instance of the `ZoomCCChatListener` object and add it to the SDK by calling the `addListener` function. See how to implement this listener and assign it to the SDK instance, along with examples of the event handlers associated with the SDK.

#### Add a listener

```java
ZoomCCChatService service = ZoomCCInterface.INSTANCE.getZoomCCChatService();
service.addListener(your listener);
```

```kotlin
val service = ZoomCCInterface.INSTANCE.zoomCCChatService
service.addListener(your listener)
```

### Callback functions

These examples show callback functions provided by the Contact Center SDK. Use these functions and implement any additional operations as needed after receiving the result of the callback function.

#### `onLoginStatus`

Get login status.

-   `entryId` - (integer) the entry ID.
-   `status` - the login status.

#### `onError`

Login failed.

-   `entryId` - (string) the entry ID.
-   `error` - (integer) the service error code. See [errors](/docs/contact-center/android/errors/) for details.
-   `detail` - (long) the error code.

#### `onEngagementStart`

Sent after the service creates an engagement.

-   `engagementId` - (string) the engagement identifier.

#### `onEngagementEnd`

Sent after the engagement ends.

-   `engagementId` - (string) the engagement identifier.

#### `unreadMsgCountChanged`

Sent when the number of unread messages changes.

-   `unreadMsgCountChanged` - (integer) the number of unread messages.

#### `onClientEvent`

Called when `VIDEO_STARTED`, `VIDEO_END`, `NOTIFICATION_JOIN_CALL`, `VIDEO_CLIENT_END`, `VIDEO_FORCE_END`, and `TASK_CREATED` events are triggered.

-   `ClientEvent` - (integer)