android webview 抓网页

Android：在WebView中获取网页源码

1. 使能javascript：

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

2. 编写本地接口

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finalclassInJavaScriptLocalObj { publicvoidshowSource(String html) { Log.d("HTML", html); } }

3. 向网页暴露本地接口

1	webView.addJavascriptInterface(newInJavaScriptLocalObj(),"local_obj");

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

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finalclassMyWebViewClientextendsWebViewClient{ publicbooleanshouldOverrideUrlLoading(WebView view, String url) { view.loadUrl(url); returntrue; } publicvoidonPageStarted(WebView view, String url, Bitmap favicon) { Log.d("WebView","onPageStarted"); super.onPageStarted(view, url, favicon); } publicvoidonPageFinished(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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packagecom.hi.briancol.htmlsource; importandroid.app.Activity; importandroid.graphics.Bitmap; importandroid.os.Bundle; importandroid.util.Log; importandroid.webkit.WebView; importandroid.webkit.WebViewClient; publicclassHtmlSourceextendsActivity { privateWebView webView; /** Called when the activity is first created. */ @Override publicvoidonCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); webView = (WebView)findViewById(R.id.webview); webView.getSettings().setJavaScriptEnabled(true); webView.addJavascriptInterface(newInJavaScriptLocalObj(),"local_obj"); webView.setWebViewClient(newMyWebViewClient()); webView.loadUrl(" http://www.cnblogs.com/hibraincol/"); } finalclassMyWebViewClientextendsWebViewClient{ publicbooleanshouldOverrideUrlLoading(WebView view, String url) { view.loadUrl(url); returntrue; } publicvoidonPageStarted(WebView view, String url, Bitmap favicon) { Log.d("WebView","onPageStarted"); super.onPageStarted(view, url, favicon); } publicvoidonPageFinished(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); } } finalclassInJavaScriptLocalObj { publicvoidshowSource(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。

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