<WebViewandroid:id="@+id/webView1"android:layout_width="fill_parent"android:layout_height="fill_parent"android:layout_marginTop="10dp" />

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

webview = (WebView) findViewById(R.id.webView1);
webview.loadUrl("http://www.baidu.com/");
//webview.reload();// reload page

webview.setWebViewClient(new WebViewClient(){@Overridepublic boolean shouldOverrideUrlLoading(WebView view, String url) {view.loadUrl(url);return true;}});

webview.setWebChromeClient(new WebChromeClient(){@Overridepublic void onProgressChanged(WebView view, int newProgress) {//get the newProgress and refresh progress bar}});

webview.setWebChromeClient(new WebChromeClient(){@Overridepublic void onReceivedTitle(WebView view, String title) {titleview.setText(title);//a textview}});

public class HttpThread extends Thread {private String mUrl;public HttpThread(String mUrl) {this.mUrl = mUrl;}@Overridepublic void run() {URL url;try {url = new URL(mUrl);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setDoInput(true);conn.setDoOutput(true);InputStream in = conn.getInputStream();File downloadFile;File sdFile;FileOutputStream out = null;if(Environment.getExternalStorageState().equals(Environment.MEDIA_UNMOUNTED)){downloadFile = Environment.getExternalStorageDirectory();sdFile = new File(downloadFile, "test.file");out = new FileOutputStream(sdFile);}//buffer 4kbyte[] buffer = new byte[1024 * 4];int len = 0;while((len = in.read(buffer)) != -1){if(out != null)out.write(buffer, 0, len);}//close resourceif(out != null)out.close();if(in != null){in.close();}} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}
}

//创建DownloadListener (webkit包)
class MyDownloadListenter implements DownloadListener{@Overridepublic void onDownloadStart(String url, String userAgent,String contentDisposition, String mimetype, long contentLength) {System.out.println("url ==== >" + url);new HttpThread(url).start();}}
//给webview加入监听
webview.setDownloadListener(new MyDownloadListenter());

class MyDownloadListenter implements DownloadListener{@Overridepublic void onDownloadStart(String url, String userAgent,String contentDisposition, String mimetype, long contentLength) {System.out.println("url ==== >" + url);//new HttpThread(url).start();Uri uri = Uri.parse(url);Intent intent = new Intent(Intent.ACTION_VIEW, uri);startActivity(intent);}}

webview.setWebViewClient(new WebViewClient(){@Overridepublic void onReceivedError(WebView view, int errorCode,String description, String failingUrl) {switch(errorCode){case HttpStatus.SC_NOT_FOUND:view.loadUrl("file:///android_assets/error_handle.html");break;}}});

public class HttpCookie extends Thread {private Handler mHandler;public HttpCookie(Handler mHandler) {this.mHandler = mHandler;}@Overridepublic void run() {HttpClient client = new DefaultHttpClient();HttpPost post = new HttpPost("");//this place should add the login addressList<NameValuePair> list = new ArrayList<NameValuePair>();list.add(new BasicNameValuePair("name", "jason"));list.add(new BasicNameValuePair("pwd", "123456"));try {post.setEntity(new UrlEncodedFormEntity(list));HttpResponse reponse = client.execute(post);if(reponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK){AbstractHttpClient absClient = (AbstractHttpClient) client;List<Cookie> cookies = absClient.getCookieStore().getCookies();for(Cookie cookie:cookies){if(cookie != null){//TODO//this place would get the cookies}}}} catch (UnsupportedEncodingException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (ClientProtocolException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}
}

if(cookie != null){//TODO//this place would get the cookiesMessage msg = new Message();msg.obj = cookie;if(mHandler != null){mHandler.sendMessage(msg);return;}
}

private Handler mHandler = new Handler(){public void handleMessage(android.os.Message msg) {CookieSyncManager.createInstance(MainActivity.this);CookieManager cookieMgr = CookieManager.getInstance();cookieMgr.setAcceptCookie(true);cookieMgr.setCookie("", msg.obj.toString());// this place should add the login host address(not the login index address)CookieSyncManager.getInstance().sync();webview.loadUrl("");// login index address};};

mWebView.loadUrl("javascript:do()");

<html><script language="javascript">/* This function is invoked by the webview*/function do() {alert("1");}</script><body><a><div style="width:80px;margin:0px auto;padding:10px;text-align:center;border:2px solid #111111;" ><img id="droid" src="xx.png"/><br>Click me!</div></a></body>
</html>

package com.test.webview;
class DemoJavaScriptInterface {DemoJavaScriptInterface() {}/*** This is not called on the UI thread. Post a runnable to invoke* loadUrl on the UI thread.*/public void clickOnAndroid() {mHandler.post(new Runnable() {public void run() {//TODO}});}}

mWebview.setJavaScriptEnabled(true);

mWebView.addJavascriptInterface(new DemoJavaScriptInterface(), "demo");

<body>  ...
</body>

-keep public class com.test.webview.DemoJavaScriptInterface{public <methods>;
}

-keep public class com.test.webview.DemoJavaScriptInterface$InnerClass{public <methods>;
}

-keepattributes *Annotation*
-keepattributes *JavascriptInterface*