JavaScript tune Java

1. Mapping Java objects to JavaScript objects

Mainactivity.java

Package Com.example.jsdemo;import Android.os.bundle;import Android.support.v7.app.appcompatactivity;import    Android.webkit.websettings;import Android.webkit.webview;public class Mainactivity extends Appcompatactivity {    Private WebView Wview;        @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);        Setcontentview (R.layout.activity_main);        Wview = (WebView) Findviewbyid (R.id.wview);        Wview.loadurl ("file:///android_asset/demo1.html");        WebSettings websettings = Wview.getsettings ();        ① set WebView allows the invocation of JS websettings.setjavascriptenabled (TRUE);        Websettings.setdefaulttextencodingname ("UTF-8");    ② Settings Support JS call Java wview.addjavascriptinterface (new Androidandjsinterface (), "Android"); } class androidandjsinterface{@JavascriptInterface public void Showtoast () {Toast.maketext (MainA        Ctivity.this, "I was called by JS", Toast.length_short). Show (); }    }}

Note: Two ways to resolve the Webview.addjavascriptinterface interface that do not work

① changed to 16 for version

② the JavaScript interface class method plus @javascriptinterface annotations

2.JavaScript calling Java Object Example

Demo1.html

<input type= "button" value= "click on Android is called" onclick= "window. Android.showtoast () "/>

JavaScript tune Java