# MessagePortClient

Artifact: [androidx.javascriptengine:javascriptengine](https://developer.android.com/jetpack/androidx/releases/javascriptengine) [View Source](https://cs.android.com/search?q=file:androidx/javascriptengine/MessagePortClient.java+class:androidx.javascriptengine.MessagePortClient) Added in [1.1.1](https://developer.android.com/jetpack/androidx/releases/javascriptengine#1.1.1)

*** ** * ** ***


```
interface MessagePortClient
```

<br />

*** ** * ** ***

Interface for handling messages received from the other end of a `https://developer.android.com/reference/kotlin/androidx/javascriptengine/MessagePort` channel.

A `https://developer.android.com/reference/kotlin/androidx/javascriptengine/MessagePortClient` implementation must be provided when creating a message channel using `https://developer.android.com/reference/kotlin/androidx/javascriptengine/JavaScriptIsolate#createMessageChannel(java.lang.String,java.util.concurrent.Executor,androidx.javascriptengine.MessagePortClient)`, and its methods are invoked on the specified `https://developer.android.com/reference/java/util/concurrent/Executor.html`.

A reference to a MessagePortClient is kept alive by its associated local `https://developer.android.com/reference/kotlin/androidx/javascriptengine/MessagePort`, which in turn is kept alive so long as the message channel is alive.

A client may be notified of multiple messages throughout its lifetime.

## Summary

| ### Public functions |
|---|---|
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/javascriptengine/MessagePortClient#onMessage(androidx.javascriptengine.Message)(message: https://developer.android.com/reference/kotlin/androidx/javascriptengine/Message)` Called when a `https://developer.android.com/reference/kotlin/androidx/javascriptengine/Message` is received by the port. |

## Public functions

### onMessage

Added in [1.1.1](https://developer.android.com/jetpack/androidx/releases/javascriptengine#1.1.1)

```
fun onMessage(message: Message): Unit
```

Called when a `https://developer.android.com/reference/kotlin/androidx/javascriptengine/Message` is received by the port.

| Parameters |
|---|---|
| `message: https://developer.android.com/reference/kotlin/androidx/javascriptengine/Message` | The `https://developer.android.com/reference/kotlin/androidx/javascriptengine/Message` that has been received by the port. |