1. activity_main.layout

2. MainActivity.java

package com.example.webviewhtml;import android.app.Activity;  import android.graphics.Bitmap;  import android.os.Bundle;  import android.webkit.JavascriptInterface;import android.webkit.WebView;  import android.webkit.WebViewClient;  /**  * Dmeo说明:  * 当WebView加载网页时获取该网页中的内容.  * 参考资料:  * http://www.maxters.net/2012/02/android-webview-get-html-source/  */  public class MainActivity extends Activity {     private WebView mWebView;           @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_main);          init();      }      private void init(){          mWebView=(WebView) findViewById(R.id.webView);          mWebView.getSettings().setJavaScriptEnabled(true);          mWebView.addJavascriptInterface(new InJavaScriptLocalObj(), "local_obj");          mWebView.getSettings().setSupportZoom(true);          mWebView.getSettings().setDomStorageEnabled(true);          mWebView.getSettings().setPluginsEnabled(true);          mWebView.requestFocus();          mWebView.getSettings().setUseWideViewPort(true);          mWebView.getSettings().setLoadWithOverviewMode(true);          mWebView.getSettings().setSupportZoom(true);          mWebView.getSettings().setBuiltInZoomControls(true);          mWebView.loadUrl("http://www.baidu.com");          mWebView.setWebViewClient(new WebViewClient() {              @Override              public void onPageStarted(WebView view, String url, Bitmap favicon) {                  super.onPageStarted(view, url, favicon);              }                @Override              public boolean shouldOverrideUrlLoading(WebView view, String url) {                  view.loadUrl(url);                  return true;              }                @Override              public void onPageFinished(WebView view, String url) {                  super.onPageFinished(view, url);                  view.loadUrl("javascript:window.local_obj.showSource(''+"                          + "document.getElementsByTagName('html')[0].innerHTML+'');");                }                @Override              public void onReceivedError(WebView view, int errorCode,                      String description, String failingUrl) {                  super.onReceivedError(view, errorCode, description, failingUrl);              }            });      }          /**     *  android sdk api >= 17 时需要加@JavascriptInterface     * @author fei     *     */    final class InJavaScriptLocalObj {      	@JavascriptInterface        public void showSource(String html) {              System.out.println("====>html="+html);          }      }  }

3. 在AndroidManifest.xml

增加权限：

<uses-permission android:name="android.permission.INTERNET" />