android JS 互相调用

public class SystemWebView extends Activity { Button button;    WebView webView ;    WebSettings webSetting;    @JavascriptInterface    @Override    protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);        setContentView(R.layout.activity_system_webview);                button = (Button)findViewById(R.id.button);        webView = (WebView)findViewById(R.id.webView);        //加载网页        webView.loadUrl("file:///android_asset/hello.html");        WebSettings settings = webView.getSettings();        settings.setDefaultTextEncodingName("GBK");//设置字符编码        settings.setJavaScriptEnabled(true); //网页是否允许JS运行        //给js window 添加子节点，方便js调用android 方法，子节点名为JsCallAndroid        webView.addJavascriptInterface(new JSCallAndroid(), "JsCallAndroid");                //覆盖WebView默认使用第三方或系统默认浏览器打开网页的行为，使网页用WebView打开        webView.setWebViewClient(new WebViewClient() { @Override            public boolean shouldOverrideUrlLoading(WebView view, String url) { // TODO Auto-generated method stub  //对网页中超链接的打开，返回值是true的时候控制用WebView打开，为false调用系统浏览器或第三方浏览器                 view.loadUrl(url);                return true;            } });        webView.setWebChromeClient(new WebChromeClient() { @Override            public boolean onJsAlert(WebView view, String url, String message,                                     JsResult result) { // TODO Auto-generated method stub  return super.onJsAlert(view, url, message, result);            } });        button.setOnClickListener(new View.OnClickListener() { @Override            public void onClick(View view) { webView.loadUrl("javascript: showFromHtml2('android said:')");            } });    } class JSCallAndroid{ @JavascriptInterface        public void htmlCallAndroid(){ Uri smsToUri = Uri.parse("smsto:");            Intent intent = new Intent(Intent.ACTION_SENDTO, smsToUri);            intent.putExtra("sms_body", "网页使用发短信");            startActivity(intent);        } @JavascriptInterface        public String htmlCallAndroid2(final String str){ Gson gson = new Gson();            JSONObject jsonObject = null;            try { jsonObject = new JSONObject(str);                String name = jsonObject.getString("name");                String password = jsonObject.getString("password");                return "{\"name\":" + name + " turn," + "\"password\":"+ password + " turn}";            } catch (JSONException e) { e.printStackTrace();            } return null;        } } }

html 网页

<!doctype html><html lang="en"> <head>  <meta charset="GBK">  <title>Document</title>  <script>  function showFromHtml2(param){     alert(param + "我调用");  }  function subInput(){      var name = document.getElementById("name").value;      var password = document.getElementById("password").value;      var str = '{"name":"' + name + '","password":"' + password +'"}';      //调用android 的方法      var str2 = window.JsCallAndroid.htmlCallAndroid2(str);      alert(str2);  }  function sendMsg(){        //调用android的方法      window.JsCallAndroid.htmlCallAndroid();  }  </script> </head> <body>  <form>   用户名：<input id="name" type="email" name="email"/>   <br/>   密码： <input id="password" type="text" name="password"/>   </br>   <input type="submit" value="提交" onclick="subInput()"/>    <input type="button" value="调用发短信页面" onclick="sendMsg()"/>  </form> </body></html>

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