# In-App Chat Callbacks

{% hint style="warning" %}

#### Avoiding Memory Leaks

These APIs hold the callbacks in a strong reference, so we strongly suggest to avoid registering callbacks without unregistering them when needed, as it may cause a memory leak.
{% endhint %}

## New Received Message

This block is executed each time a new message is received. This can be used to show your own UI when a new message is received.

{% tabs %}
{% tab title="Java" %}
{% code overflow="wrap" %}

```java
Replies.setOnNewReplyReceivedCallback(new Runnable() {
  @Override
  public void run() {
    // Show an alert to notify users about a new message.
  }
});
```

{% endcode %}
{% endtab %}

{% tab title="Kotlin" %}
{% code overflow="wrap" %}

```kotlin
Replies.setOnNewReplyReceivedCallback {
    // Show an alert to notify users about a new message.
}
```

{% endcode %}
{% endtab %}
{% endtabs %}


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