在WebView中获取html源码

1. 使能javascript：

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1	webView.getSettings().setJavaScriptEnabled( true );

2. 编写本地接口

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final class InJavaScriptLocalObj {      public void showSource(String html) {          Log.d( "HTML" , html);      } }

3. 向网页暴露本地接口

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1	webView.addJavascriptInterface( new InJavaScriptLocalObj(), "local_obj" );

4. 编写自己的WebViewClient，并在onPageFinished中提取网页源码。

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final class MyWebViewClient extends WebViewClient{       public boolean shouldOverrideUrlLoading(WebView view, String url) {            view.loadUrl(url);            return true ;        }       public void onPageStarted(WebView view, String url, Bitmap favicon) {          Log.d( "WebView" , "onPageStarted" );          super .onPageStarted(view, url, favicon);      }         public void onPageFinished(WebView view, String url) {          Log.d( "WebView" , "onPageFinished " );          view.loadUrl( "javascript:window.local_obj.showSource('<head>'+" +                  "document.getElementsByTagName('html')[0].innerHTML+'</head>');" );          super .onPageFinished(view, url);      } }

 

组合在一起的代码为：

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package com.hi.briancol.htmlsource;   import android.app.Activity; import android.graphics.Bitmap; import android.os.Bundle; import android.util.Log; import android.webkit.WebView; import android.webkit.WebViewClient;   public class HtmlSource extends Activity {      private WebView webView;      /** Called when the activity is first created. */      @Override      public void onCreate(Bundle savedInstanceState) {          super .onCreate(savedInstanceState);          setContentView(R.layout.main);          webView = (WebView)findViewById(R.id.webview);          webView.getSettings().setJavaScriptEnabled( true );          webView.addJavascriptInterface( new InJavaScriptLocalObj(), "local_obj" );          webView.setWebViewClient( new MyWebViewClient());          webView.loadUrl( "http://www.cnblogs.com/hibraincol/" );      }                 final class MyWebViewClient extends WebViewClient{           public boolean shouldOverrideUrlLoading(WebView view, String url) {                view.loadUrl(url);                return true ;            }           public void onPageStarted(WebView view, String url, Bitmap favicon) {              Log.d( "WebView" , "onPageStarted" );              super .onPageStarted(view, url, favicon);          }             public void onPageFinished(WebView view, String url) {              Log.d( "WebView" , "onPageFinished " );              view.loadUrl( "javascript:window.local_obj.showSource('<head>'+" +                      "document.getElementsByTagName('html')[0].innerHTML+'</head>');" );              super .onPageFinished(view, url);          }      }            final class InJavaScriptLocalObj {          public void showSource(String html) {              Log.d( "HTML" , html);          }      } }

关键之处在于：

view.loadUrl("javascript:window.local_obj.showSource('<head>'+document.getElementsByTagName('html')[0].innerHTML+'</head>');");

运行，可以看到在showSource(String html)中打印了网页源码。