# Listen for audio events

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The Video SDK for Android fires audio-related callbacks through `ZoomVideoSDKDelegate`. Implement the callbacks you need on your listener and the Video SDK for Android will invoke them on the main thread.

`onUserAudioStatusChanged` and `onUserActiveAudioChanged` look similar but fire at different times. Use them together:

-   **`onUserAudioStatusChanged`**: fires when a user's audio _state_ changes, such as when they mute, unmute, connect, or disconnect. Use it to drive your mute icons.
-   **`onUserActiveAudioChanged`**: fires when the SDK detects sound (or silence) on a user's microphone. Use it to highlight the active speaker or animate a "talking" indicator.

For example, if a user is unmuted and starts speaking, `onUserActiveAudioChanged` fires repeatedly while they talk. Their `onUserAudioStatusChanged` only fires once, when they unmuted.

## Get notified when a user's audio status has changed

To react when a user mutes, unmutes, connects, or disconnects, implement `onUserAudioStatusChanged` and read each user's `audioStatus`.

```kotlin
override fun onUserAudioStatusChanged(audioHelper: ZoomVideoSDKAudioHelper?, userList: MutableList<ZoomVideoSDKUser>) {
    userList.forEach {
        // Check the current user to see if they are muted
        val audioStatus = it.audioStatus
        audioStatus.isMuted
    }
}
```

```java
@Override
public void onUserAudioStatusChanged(ZoomVideoSDKAudioHelper audioHelper, List<ZoomVideoSDKUser> userList) {
    for (ZoomVideoSDKUser user : userList) {
        // Check the current user to see if they are muted
        ZoomVideoSDKAudioStatus audioStatus = user.getAudioStatus();
        audioStatus.isMuted();
    }
}
```

## Get notified when active audio changes

To drive an active-speaker UI, implement `onUserActiveAudioChanged` and read `audioStatus.isTalking` on each user.

```kotlin
override fun onUserActiveAudioChanged(audioHelper: ZoomVideoSDKAudioHelper?, list: MutableList<ZoomVideoSDKUser>) {
    list.forEach {
        // Check if the current user is talking
        val audioStatus = it.audioStatus
        audioStatus.isTalking
    }
}
```

```java
@Override
public void onUserActiveAudioChanged(ZoomVideoSDKAudioHelper audioHelper, List<ZoomVideoSDKUser> list) {
    for (ZoomVideoSDKUser user : list) {
        // Check if the current user is talking
        ZoomVideoSDKAudioStatus audioStatus = user.getAudioStatus();
        audioStatus.isTalking();
    }
}
```

## Get notified when mixed audio raw data is received

To receive the combined PCM stream that mixes audio from every user in the session, implement `onMixedAudioRawDataReceived`.

```kotlin
override fun onMixedAudioRawDataReceived(rawData: ZoomVideoSDKAudioRawData?) {
    // See raw data documentation for more information
}
```

```java
@Override
public void onMixedAudioRawDataReceived(ZoomVideoSDKAudioRawData zoomVideoSDKAudioRawData) {
    // See raw data documentation for more information
}
```

## Get notified when one-way audio raw data is received

To receive per-user PCM audio with the originating user attached, implement `onOneWayAudioRawDataReceived`.

```kotlin
override fun onOneWayAudioRawDataReceived(rawData: ZoomVideoSDKAudioRawData?, user: ZoomVideoSDKUser?) {
    // See raw data documentation for more information
}
```

```java
@Override
public void onOneWayAudioRawDataReceived(ZoomVideoSDKAudioRawData zoomVideoSDKAudioRawData, ZoomVideoSDKUser zoomVideoSDKUser) {
    // See raw data documentation for more information
}
```

## Get notified when shared audio raw data is received

To receive PCM audio captured alongside an active screen share, implement `onShareAudioRawDataReceived`.

```kotlin
override fun onShareAudioRawDataReceived(rawData: ZoomVideoSDKAudioRawData?) {
    // See raw data documentation for more information
}
```

```java
@Override
public void onShareAudioRawDataReceived(ZoomVideoSDKAudioRawData zoomVideoSDKAudioRawData) {
    // See raw data documentation for more information
}
```