Communication on android

Hi, I am trying to send message from js to c#. It's working on windows and ios but not on android. Am I doing something wrong?
```
if (window.chrome) {
    window.chrome.webview.postMessage(JSON.stringify(point));
} else if (window.webkit) {
    window.webkit.messageHandlers.webview.postMessage(JSON.stringify(point));
}
```
```
WebView.WebMessageReceived += OnWebMessageReceived;
```