What s the difference between setWebViewClient vs setWebChromeClient

Question

What s the difference between setWebViewClient vs  setWebChromeClient in Android

User · Answer

If you want to log errors from web-page  you should use WebChromeClient and override its onConsoleMessage  webView settings apply       javaScriptEnabled   true     javaScriptCanOpenWindowsAutomatically   true     domStorageEnabled   true   webView webViewClient   WebViewClient   webView webChromeClient   MyWebChromeClient    private class MyWebChromeClient   WebChromeClient         override fun onConsoleMessage consoleMessage  ConsoleMessage   Boolean           Timber d  quot   consoleMessage message    quot           Timber d  quot   consoleMessage lineNumber      consoleMessage sourceId    quot           return super onConsoleMessage consoleMessage

User · Answer

From the source code      Instance of WebViewClient that is the client callback  private volatile WebViewClient mWebViewClient     Instance of WebChromeClient for handling all chrome functions  private volatile WebChromeClient mWebChromeClient      SOME OTHER SUTFFF                Set the WebViewClient      param client An implementation of WebViewClient      public void setWebViewClient WebViewClient client        mWebViewClient   client            Set the WebChromeClient      param client An implementation of WebChromeClient      public void setWebChromeClient WebChromeClient client        mWebChromeClient   client      Using WebChromeClient allows you to handle Javascript dialogs  favicons  titles  and the progress  Take a look of this example  Adding alert   support to a WebView  At first glance  there are too many differences WebViewClient  amp  WebChromeClient  But  basically  if you are developing a WebView that won t require too many features but rendering HTML  you can just use a WebViewClient  On the other hand  if you want to  for instance  load the favicon of the page you are rendering  you should use a WebChromeClient object and override the onReceivedIcon WebView view  Bitmap icon    Most of the times  if you don t want to worry about those things    you can just do this   webView   WebView  findViewById R id webview    webView setWebChromeClient new WebChromeClient      webView setWebViewClient new WebViewClient      webView getSettings   setJavaScriptEnabled true    webView loadUrl url      And your WebView will  in theory  have all features implemented  as the android native browser

User · Answer

WebViewClient provides the following callback methods  with which you can interfere in how WebView makes a transition to the next content  void doUpdateVisitedHistory  WebView view  String url  boolean isReload  void onFormResubmission  WebView view  Message dontResend  Message resend  void onLoadResource  WebView view  String url  void onPageCommitVisible  WebView view  String url  void onPageFinished  WebView view  String url  void onPageStarted  WebView view  String url  Bitmap favicon  void onReceivedClientCertRequest  WebView view  ClientCertRequest request  void onReceivedError  WebView view  int errorCode  String description  String failingUrl  void onReceivedError  WebView view  WebResourceRequest request  WebResourceError error  void onReceivedHttpAuthRequest  WebView view  HttpAuthHandler handler  String host  String realm  void onReceivedHttpError  WebView view  WebResourceRequest request  WebResourceResponse errorResponse  void onReceivedLoginRequest  WebView view  String realm  String account  String args  void onReceivedSslError  WebView view  SslErrorHandler handler  SslError error  boolean onRenderProcessGone  WebView view  RenderProcessGoneDetail detail  void onSafeBrowsingHit  WebView view  WebResourceRequest request  int threatType  SafeBrowsingResponse callback  void onScaleChanged  WebView view  float oldScale  float newScale  void onTooManyRedirects  WebView view  Message cancelMsg  Message continueMsg  void onUnhandledKeyEvent  WebView view  KeyEvent event  WebResourceResponse shouldInterceptRequest  WebView view  WebResourceRequest request  WebResourceResponse shouldInterceptRequest  WebView view  String url  boolean shouldOverrideKeyEvent  WebView view  KeyEvent event  boolean shouldOverrideUrlLoading  WebView view  WebResourceRequest request  boolean shouldOverrideUrlLoading  WebView view  String url   WebChromeClient provides the following callback methods  with which your Activity or Fragment can update the surroundings of WebView  Bitmap getDefaultVideoPoster    View getVideoLoadingProgressView    void getVisitedHistory  ValueCallback lt String   gt  callback  void onCloseWindow  WebView window  boolean onConsoleMessage  ConsoleMessage consoleMessage  void onConsoleMessage  String message  int lineNumber  String sourceID  boolean onCreateWindow  WebView view  boolean isDialog  boolean isUserGesture  Message resultMsg  void onExceededDatabaseQuota  String url  String databaseIdentifier  long quota  long estimatedDatabaseSize  long totalQuota  WebStorage QuotaUpdater quotaUpdater  void onGeolocationPermissionsHidePrompt    void onGeolocationPermissionsShowPrompt  String origin  GeolocationPermissions Callback callback  void onHideCustomView    boolean onJsAlert  WebView view  String url  String message  JsResult result  boolean onJsBeforeUnload  WebView view  String url  String message  JsResult result  boolean onJsConfirm  WebView view  String url  String message  JsResult result  boolean onJsPrompt  WebView view  String url  String message  String defaultValue  JsPromptResult result  boolean onJsTimeout    void onPermissionRequest  PermissionRequest request  void onPermissionRequestCanceled  PermissionRequest request  void onProgressChanged  WebView view  int newProgress  void onReachedMaxAppCacheSize  long requiredStorage  long quota  WebStorage QuotaUpdater quotaUpdater  void onReceivedIcon  WebView view  Bitmap icon  void onReceivedTitle  WebView view  String title  void onReceivedTouchIconUrl  WebView view  String url  boolean precomposed  void onRequestFocus  WebView view  void onShowCustomView  View view  int requestedOrientation  WebChromeClient CustomViewCallback callback  void onShowCustomView  View view  WebChromeClient CustomViewCallback callback  boolean onShowFileChooser  WebView webView  ValueCallback lt Uri   gt  filePathCallback  WebChromeClient FileChooserParams fileChooserParams

User · Answer

I feel this question need a bit more details  My answer is inspired from the Android Programming  The Big Nerd Ranch Guide  2nd edition   By default  JavaScript is off in WebView  You do not always need to have it on  but for some apps  might do require it  Loading the URL has to be done after configuring the WebView  so you do that last  Before that  you turn JavaScript on by calling getSettings   to get an instance of WebSettings and calling WebSettings setJavaScriptEnabled true   WebSettings is the first of the three ways you can modify your WebView  It has various properties you can set  like the user agent string and text size  After that  you configure your WebViewClient  WebViewClient is an event interface  By providing your own implementation of WebViewClient  you can respond to rendering events  For example  you could detect when the renderer starts loading an image from a particular URL or decide whether to resubmit a POST request to the server  WebViewClient has many methods you can override  most of which you will not deal with  However  you do need to replace the default WebViewClient   s implementation of shouldOverrideUrlLoading WebView  String   This method determines what will happen when a new URL is loaded in the WebView  like by pressing a link  If you return true  you are saying     Do not handle this URL  I am handling it myself     If you return false  you are saying     Go ahead and load this URL  WebView  I   m not doing anything with it     The default implementation fires an implicit intent with the URL  just like you did earlier  Now  though  this would be a severe problem  The first thing some Web Applications does is redirect you to the mobile version of the website  With the default WebViewClient  that means that you are immediately sent to the user   s default web browser  This is just what you are trying to avoid  The fix is simple     just override the default implementation and return false  Use WebChromeClient to spruce things up Since you are taking the time to create your own WebView  let   s spruce it up a bit by adding a progress bar and updating the toolbar   s subtitle with the title of the loaded page  To hook up the ProgressBar  you will use the second callback on WebView  WebChromeClient  WebViewClient is an interface for responding to rendering events  WebChromeClient is an event interface for reacting to events that should change elements of chrome around the browser  This includes JavaScript alerts  favicons  and of course updates for loading progress and the title of the current page  Hook it up in onCreateView       Using WebChromeClient to spruce things up Progress updates and title updates each have their own callback method  onProgressChanged WebView  int  and onReceivedTitle WebView  String   The progress you receive from onProgressChanged WebView  int  is an integer from 0 to 100  If it is 100  you know that the page is done loading  so you hide the ProgressBar by setting its visibility to View GONE   Disclaimer  This information was taken from Android Programming  The Big Nerd Ranch Guide with permission from the authors  For more information on this book or to purchase a copy  please visit bignerdranch com

[android] What's the difference between setWebViewClient vs. setWebChromeClient?

Examples related to android

Examples related to webviewclient

Examples related to webchromeclient