1. 使能javascript：
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webView.getSettings().setJavaScriptEnabled(true);
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2. 编写本地接口
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final class InJavaScriptLocalObj
{
public void showSource(String
html) {
Log.d("HTML",
html);
}
}
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3. 向网页暴露本地接口
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webView.addJavascriptInterface(new InJavaScriptLocalObj(),
"local_obj");
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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);
}
}
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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);
}
}
}
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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。