How to Call JavaScript Functions from an Android WebView?

Calling JavaScript Functions from an Android WebView

It is possible to invoke JavaScript functions from within an Android WebView using the addJavascriptInterface() method.

Setup

To enable this functionality, ensure that JavaScript is enabled on the WebView:

myWebView.getSettings().setJavaScriptEnabled(true);

Additionally, register a Java class that contains the methods you want to expose to JavaScript:

myWebView.addJavascriptInterface(myJSInterface, "JSInterface"); 

Calling JavaScript Functions

To call a JavaScript function from the Android app, use the following syntax:

myWebView.loadUrl("javascript:testEcho(Hello World!)");

Resolving the Issue

It turns out that the provided code had a missing quote in the parameter of the testEcho() function call. The correct approach is:

myWebView.loadUrl("javascript:testEcho('Hello World!')");

This resolves the issue and allows the JavaScript function to be successfully invoked from the Android app.

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