Android：在WebView中擷取網頁源碼

最後更新：2018-12-07 來源：互聯網

上載者：User

創建阿里雲帳戶，並獲得超過 40 款產品的免費試用版；而企業帳戶則可以享有總值 $1200 的免費試用版。立即註冊！

1. 使能javascript：

webView.getSettings().setJavaScriptEnabled(true);

2. 編寫本地介面

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

3. 向網頁暴露本地介面

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

4. 編寫自己的WebViewClient，並在onPageFinished中提取網頁源碼。

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);    }}

組合在一起的代碼為：

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);        }    }}

關鍵之處在於：

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

運行，可以看到在showSource(String html)中列印了網頁源碼。

本文章原先以中文撰寫並發佈於 aliyun.com，亦設英文版本，僅作資訊用途。本網站不對文章的準確性，完整性或可靠性或其任何翻譯作出任何明示或暗示的陳述或保證。如對該文章有任何疑慮或投訴，請傳送電郵至 info-contact@alibabacloud.com 並提供相關疑慮或投訴的詳細說明。職員會於 5 個工作天內與您聯絡，一經驗證之後，即會刪除該侵權內容。

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

Sales Support

1 on 1 presale consultation

Chat Contact Sales
After-Sales Support

24/7 Technical Support 6 Free Tickets per Quarter Faster Response

Open a Ticket
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

Learn More