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()); } 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。