Menu
How do we call javascript from Android? I have this javascript library which I would like to use, I want to call the javascript function and pass the result value to the android java code. Haven't found the answer from now. i managed to call android code from javascript, but I want the other way around.
809
We can execute Js function using Android. But only logic code. We cannot do any UI changes kind of things(as I know) using this libraries. The library which we are using to execute JS is Rhino.
WebView is a special component in Android which serves as kind of built-in browser inside Android applications. If you want to execute HTML, CSS or JavaScript code in your Android app, or you need to allow users visit a URL without leaving your application, WebView is the way to go.
JavaScript is disabled in a WebView by default. You can enable it through the WebSettings attached to your WebView . You can retrieve WebSettings with getSettings() , then enable JavaScript with setJavaScriptEnabled() . WebView myWebView = (WebView) findViewById(R.
2.1 To receive data from webview ,we can create an interface, which will enable webview to connect the native layer and pass data. From native layer, create a class and replicate the following. While configuring web view, we need to set JavaScript interface as above JSBridge class.
There is a hack:
Bind some Java object so that it can be called from Javascript with WebView:
addJavascriptInterface(javaObjectCallback, "JavaCallback")
Force execute javascript within an existing page by
WebView.loadUrl("javascript: var result = window.YourJSLibrary.callSomeFunction();
window.JavaCallback.returnResult(result)");
(in this case your java class JavaObjectCallback should have a method returnResult(..))
Note: this is a security risk - any JS code in this web page could access/call your binded Java object. Best to pass some one-time cookies to loadUrl() and pass them back your Java object to check that it's your code making the call.
132
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
