Android： 在WebView中获取网页源码

1. 使能javascript：

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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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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。

posted @ 2013-07-08 16:04  郑文亮  阅读(2064)  评论(0)    收藏  举报