How can I call Android JavaScript functions in WebView?

Android Calling JavaScript functions in WebView

• I am trying to call some javascript functions sitting in an html page running inside an android webview. Pretty simple what the code tries to do below - from the android app, call a javascript function with a test message, which inturn calls a java function back in the android app that displays test message via toast. The javascript function looks like: function testEcho(message){ window.JSInterface.doEchoTest(message); } From the WebView, I have tried calling the javascript the following ways with no luck: myWebView.loadUrl("javascript:testEcho(Hello World!)"); mWebView.loadUrl("javascript:(function () { " + "testEcho(Hello World!);" + "})()"); I did enable javascript on the WebView myWebView.getSettings().setJavaScriptEnabled(true); // register class containing methods to be exposed to JavaScript myWebView.addJavascriptInterface(myJSInterface, "JSInterface"); And heres the Java Class public class JSInterface{ private WebView mAppView; public JSInterface (WebView appView) { this.mAppView = appView; } public void doEchoTest(String echo){ Toast toast = Toast.makeText(mAppView.getContext(), echo, Toast.LENGTH_SHORT); toast.show(); } } I've spent a lot of time googling around to see what I may be doing wrong. All examples I have found use this approach. Does anyone see something wrong here? Edit: There are several other external javascript files being referenced & used in the html, could they be the issue?

• Answer:

  I figured out what the issue was : missing quotes in the testEcho() parameter. This is how I got the call to work: myWebView.loadUrl("javascript:testEcho('Hello World!')");