Using JS to interact with Java

To facilitate web and application interaction, the Android system WebView provides a mechanism for JavaScript Web script to invoke Java class methods. You can map a Java object to a JavaScript object as long as you call the Addjavascriptinterface method.

Mainactivity.java Code:

Package Com.apple.browser;import Android.annotation.suppresslint;import Android.app.activity;import Android.os.bundle;import Android.view.menu;import Android.webkit.websettings;import Android.webkit.WebView;import Android.widget.toast;public class Mainactivity extends activity {private WebView webview;private activity activity;@ Suppresslint ("setjavascriptenabled") @Overrideprotected void OnCreate (Bundle savedinstancestate) {super.oncreate ( Savedinstancestate); Setcontentview (r.layout.activity_main); activity = This;webview = (webView) Findviewbyid ( R.id.webview); Webview.loadurl ("file:///android_asset/index.html"); final websettings settings = webview.getsettings (); settings.setjavascriptcanopenwindowsautomatically (true); settings.setjavascriptenabled (true); Settings.setsupportzoom (True); Webview.addjavascriptinterface (new Jsinvokeclass (), "Js2java");} Public final class Jsinvokeclass {public void back () {//Activity.finish (); Toast.maketext (Activity, "Java method called by JS", Toast.length_short). Show ();}} 

Code in HTML:

<input Type=button name=smt value= ' invoke Java ' onclick= "Javascript:window.js2java.back ();" >

XML Layout Code:
Slightly

Using JS to interact with Java