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Added in API level 23

WebMessageCallback

Kotlin |Java

abstract class WebMessageCallback

kotlin.Any
	android.webkit.WebMessagePort.WebMessageCallback

The listener for handling MessagePort events. The message callback methods are called on the main thread. If the embedder application wants to receive the messages on a different thread, it can do this by passing a Handler in WebMessagePort.setWebMessageCallback(WebMessageCallback,Handler). In the latter case, the application should be extra careful for thread safety since WebMessagePort methods should be called on main thread.

Summary

Public constructors
`WebMessageCallback()`

Public methods
open Unit	`onMessage(port: WebMessagePort!, message: WebMessage!)` Message callback for receiving onMessage events.

Public constructors

WebMessageCallback

WebMessageCallback()

Public methods

onMessage

Added in API level 23

open fun onMessage(
    port: WebMessagePort!, 
    message: WebMessage!
): Unit

Message callback for receiving onMessage events.

Parameters
`port`	WebMessagePort!: the WebMessagePort that the message is destined for
`message`	WebMessage!: the message from the entangled port.

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Last updated 2026-02-26 UTC.

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