Android与JS之间跨平台异步调用

为什么突然要搞这个问题呢？

　　在开发浏览器的时候遇到这个狗血的问题，花了将近1天的时间才想到这个解决方案，Android与JavaScirpt互调。

　　因为接口是抓取的别人的，所以出现了JS跨域问题，Android闪亮登场搞定了。

GIF动画演示

WebView相关设置

WebSettings mWebSettings = getSettings();

mWebSettings.setDefaultTextEncodingName("UTF-8");//设置默认的显示编码

mWebSettings.setJavaScriptEnabled(true);//调用JS方法.安卓版本大于17,加上注解 @JavascriptInterface

直接放大招->贴代码

　Android

         addJavascriptInterface(new Object() {

             @JavascriptInterface

             public void toastMessage(final String url, final int type, final int dir) {

                 L.e("url = " + url + " type = " + type + " dir = " + dir);

                 APIWrapper.getInstance()

                         .getLenovoWord(url)

                         .subscribeOn(Schedulers.io())

                         .observeOn(AndroidSchedulers.mainThread())

                         .subscribe(new RxSubscriber<ResponseBody>() {

                             @Override

                             public void _onNext(ResponseBody responseBody) {

                                 try {

                                     String data = responseBody.string();

                                     L.e("data = " + data);

                                     loadUrl("javascript:ResCompleted(" + data + "," + type + "," + dir + ")");

                                 } catch (IOException e) {

                                     e.printStackTrace();

                                 }

                             }

                             @Override

                             public void _onError(String msg) {

                                 loadUrl("javascript:ResCompleted(" + msg + ")");

                             }

                         });

             }

         }, "Android");

　Html

 <html>

 <meta name="viewport"

       content="width=device-width,height=device-height,inital-scale=1.0,maximum-scale=1.0,user-scalable=no;">

 <head>

     <title>Js调用Android代码</title>

     <style>

         #button-call{

         width: 100%;

         padding: 20px;

         font-size: 20px;

         }

         #div_bg{

         background: #cccccc;

         margin-top: 50px;

         }

     </style>

     <script type="text/javascript">

         window.onload=function() {

             document.getElementById('button_call').onclick=function(){

                 window.Android.toastMessage("http://api.sina.cn/sinago/list.json?channel=news_toutiao",1, 0);

             }

         }

         function ResCompleted(result,type,dir) {

             document.getElementById('div_bg').innerHTML='Android调用JS代码-成功!!!'+JSON.stringify(result);

         }

     </script>

 </head>

 <body>

 <button id="button_call">Js调用Android代码</button>

 <div id="div_bg"></div>

 </body>

 </html>