Android WebView Application

Android WebView Application

This example mainly introduces how to design the UI through the web page through WebView (how to return a friendly interface to the user when the web page UI request is incorrect), how to use WebView to implement the download function, and use cookies to implement the login-free function.

 

Xml layout File

 

Main Function Code

 

 

Public class MainActivity extends Activity implements OnClickListener {private WebView mWebView; private ImageButton mBackBtn, mRefreshBtn; private TextView mUrlTv; private Handler mHandler = new Handler () {public void handleMessage (android. OS. message msg) {String cookie = (String) msg. obj; System. out. println (cookie); CookieSyncManager. createInstance (MainActivity. this); CookieManager cookieManager = CookieManager. getInstance (); cookieManager. setAcceptCookie (true); cookieManager. setCookie (http: // 10.10.1.24/android % 20web/vebview. php, cookie); CookieSyncManager. getInstance (). sync (); mWebView. loadUrl (http: // 10.10.1.24/android % 20web/vebview. php) ;}};@ Overrideprotected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); mWebView = (WebView) findViewById (R. id. id_webview); mBackBtn = (ImageButton) findViewById (R. id. id_back); mRefreshBtn = (ImageButton) findViewById (R. id. id_refresh); mUrlTv = (TextView) findViewById (R. id. id_url); mBackBtn. setOnClickListener (this); mRefreshBtn. setOnClickListener (this); mWebView. loadUrl (http: // what); mWebView. setWebChromeClient (new WebChromeClient () {/*** get the html page title */@ Overridepublic void onReceivedTitle (WebView view, String title) {mUrlTv. setText (title); super. onReceivedTitle (view, title) ;}}); mWebView. setWebViewClient (new WebViewClient () {@ Overridepublic boolean shouldOverrideUrlLoading (WebView view, String url) {view. loadUrl (url); return super. shouldOverrideUrlLoading (view, url);}/*** request page error handling */@ Overridepublic void onReceivedError (WebView view, int errorCode, String description, String failingUrl) {super. onReceivedError (view, errorCode, description, failingUrl); mWebView. loadUrl (file: // android_asset/error.html) ;}});/*** click the download link to process whether to download the file directly or through a browser */mWebView. setDownloadListener (new MyDownLoadListener ();/*** use the WebView cookie to implement the login-free function */new HttpCookie (mHandler ). start ();} class MyDownLoadListener implements DownloadListener {@ Overridepublic void onDownloadStart (String url, String userAgent, String contentDisposition, String mimetype, long contentLength) {/*** click the download link and the downloaded file is apk *. */if(url.endsWith(.apk) {// new HttpThread (url ). start (); Uri uri = Uri. parse (url); Intent intent = new Intent (Intent. ACTION_VIEW, uri); startActivity (intent) ;}}@ Overridepublic void onClick (View v) {switch (v. getId () {case R. id. id_refresh: mWebView. reload (); break; case R. id. id_back: finish (); break ;}}}

Thread for downloading

 

 

public class HttpThread extends Thread {private String mUrl;public HttpThread(String url) {this.mUrl = url;}@Overridepublic void run() {InputStream is = null;FileOutputStream fos = null;try {URL httpUrl = new URL(mUrl);HttpURLConnection conn = (HttpURLConnection) httpUrl.openConnection();conn.setDoInput(true);conn.setDoOutput(true);conn.setConnectTimeout(5000);File downloadFolder;File downloadfile;is = conn.getInputStream();if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){downloadFolder = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + WebDownd);if(!downloadFolder.exists()){downloadFolder.mkdir();}downloadfile = new File(downloadFolder, test.apk);fos = new FileOutputStream(downloadfile);}byte[] buffer = new byte[1024];int len;while ((len = is.read(buffer)) != -1) {fos.write(buffer,0,len);}System.out.println(download sucess);} catch (Exception e) {e.printStackTrace();}finally{try {if (is != null)is.close();if (fos != null)fos.close();} catch (IOException e) {e.printStackTrace();};}}}

Cookie obtaining thread

 

 

public class HttpCookie extends Thread {private Handler mHandler;public HttpCookie(Handler handler) {this.mHandler = handler;}@Overridepublic void run() {HttpClient client = new DefaultHttpClient();HttpPost post = new HttpPost(http://10.10.1.24/android%20web/login.php);List
 
   list = new ArrayList
  
   ();list.add(new BasicNameValuePair(name, zhangliang));list.add(new BasicNameValuePair(pwd, 123));try {post.setEntity(new UrlEncodedFormEntity(list));HttpResponse response = client.execute(post);if(response.getStatusLine().getStatusCode() == 200){AbstractHttpClient absClient = (AbstractHttpClient) client;List
   
     cookies = absClient.getCookieStore().getCookies();String ck = null;for (Cookie cookie : cookies) {System.out.println(cookie.getName() + cookie.getValue());ck = cookie.getName() + = + cookie.getValue() + ;domain= + cookie.getDomain() + ;;}Message message = new Message();message.obj = ck;mHandler.sendMessage(message);}} catch (Exception e) {e.printStackTrace();}}}
   
  
 

 

The following is the php background code:

 

Login Page

 

Cookie settings page