Prevent WebView from displaying web page not available

Question

I have an app that makes extensive use of a WebView  When the user of this app does not have Internet connection  a page saying  web page not available  and various other text appears  Is there a way to not show this generic text in my WebView  I would like to provide my own error handling    private final Activity activity   this   private class MyWebViewClient extends WebViewClient  public void onReceivedError WebView view  int errorCode  String description  String failingUrl         I need to do something like this    activity webView wipeOutThePage      activity myCustomErrorHandling      Toast makeText activity  description  Toast LENGTH LONG  show           I found out WebView- clearView doesn t actually clear the view

User · Answer

I would just change the webpage to whatever you are using for error handling:

getWindow().requestFeature(Window.FEATURE_PROGRESS);  
webview.getSettings().setJavaScriptEnabled(true);  
final Activity activity = this;  
webview.setWebChromeClient(new WebChromeClient() {  
public void onProgressChanged(WebView view, int progress) {  
 // Activities and WebViews measure progress with different scales.  
 // The progress meter will automatically disappear when we reach 100%  
 activity.setProgress(progress * 1000);  
 }  
});  
webview.setWebViewClient(new WebViewClient() {  
public void onReceivedError(WebView view, int errorCode, String description, String 
failingUrl) {  
 Toast.makeText(activity, "Oh no! " + description, Toast.LENGTH_SHORT).show();  
}  
});  
webview.loadUrl("http://slashdot.org/");

this can all be found on http://developer.android.com/reference/android/webkit/WebView.html

User · Answer

I ve been working on this problem of ditching those irritable Google error pages today  It is possible with the Android example code seen above and in plenty of other forums  ask how I know    wv setWebViewClient new WebViewClient         public void onReceivedError WebView view  int errorCode                              String description  String failingUrl           if  view canGoBack                view goBack                     Toast makeText getBaseContext    description  Toast LENGTH LONG  show                         IF you put it in shouldOverrideUrlLoading   as one more webclient  At least  this is working for me on my 2 3 6 device   We ll see where else it works later  That would only depress me now  I m sure   The goBack bit is mine  You may not want it

User · Answer

Perhaps I misunderstand the question  but it sounds like you re saying you get the error received callback  and you just are asking what is the best way to not show the error  Why don t you just either remove the web view from the screen and or show another view on top of it

User · Answer

I suppose that if you insist on doing this  you could just check if the resource is there before calling the loadURL function   Just simply override the functions and do the check before calling the super    REMARK  maybe off-topic   In http  there is a method called HEAD which is described as follow      The HEAD method is identical to GET except that the server MUST NOT return a message-body in the response   This method might be handy  Anyway how ever you implement it     check this code   import java util Map   import android content Context  import android webkit WebView   public class WebViewPreLoad extends WebView   public WebViewPreLoad Context context    super context     public void loadUrl String str   if   Check if exists  super loadUrl str   else   handle error   public void loadUrl String url  Map lt String String gt  extraHeaders   if   Check if exists  super loadUrl url  extraHeaders   else   handle error       You could try this check using   if url openConnection   getContentLength    gt  0

User · Answer

We can set the visibility of webView to 0 view INVISIBLE  and show some message  This code works for my app running on lolipop    SuppressWarnings  deprecation        Override     public void onReceivedError WebView webView  int errorCode  String description  String failingUrl               hide webView content and show custom msg         webView setVisibility View INVISIBLE           Toast makeText NrumWebViewActivity this getString R string server not responding   Toast LENGTH SHORT  show                TargetApi android os Build VERSION CODES M       Override     public void onReceivedError WebView view  WebResourceRequest req  WebResourceError rerr               Redirect to deprecated method  so you can use it in all SDK versions         onReceivedError view  rerr getErrorCode    rerr getDescription   toString    req getUrl   toString

User · Answer

try this shouldOverrideUrlLoading   before redirect to another url check for internet conncetion based on that page should be loaded or not

User · Answer

Here I found the easiest solution  check out this        Override         public void onReceivedError WebView view  int errorCode                                      String description  String failingUrl                      view loadUrl  about blank                mWebView stopLoading                if   mUtils isInterentConnection                      Toast makeText ReportingActivity this   Please Check Internet Connection    Toast LENGTH SHORT  show                              super onReceivedError view  errorCode  description  failingUrl               And here is isInterentConnection   method     public boolean isInterentConnection         ConnectivityManager manager    ConnectivityManager  mContext              getSystemService Context CONNECTIVITY SERVICE       if  manager    null            NetworkInfo info     manager getAllNetworkInfo            if  info    null                for  int i   0  i  lt  info length  i                      if  info i  getState      NetworkInfo State CONNECTED                        return true                                                      return false

User · Answer

When webview is embedded in some custom view such that user almost believes that he is seeing a native view and not a webview  in such scenario showing the  page could not be loaded  error is preposterous  What I usually do in such situation is I load blank page and show a toast message as below  webView setWebViewClient new WebViewClient                   Override             public void onReceivedError WebView view  int errorCode                      String description  String failingUrl                    Log e TAG   Error occured while loading the web page at Url   failingUrl      description                        view loadUrl  about blank                    Toast makeText App getContext     Error occured  please check newtwork connectivity   Toast LENGTH SHORT  show                    super onReceivedError view  errorCode  description  failingUrl

User · Answer

Check out the discussion at Android WebView onReceivedError    It s quite long  but the consensus seems to be that a  you can t stop the  web page not available  page appearing  but b  you could always load an empty page after you get an onReceivedError

User · Answer

Finally  I solved this   It works till now     My solution is like this      Prepare the layout to show when an error occurred instead of Web Page  a dirty  page not found message   The layout has one button   RELOAD  with some guide messages  If an error occurred  Remember using boolean and show the layout we prepare  If user click  RELOAD  button  set mbErrorOccured to false  And Set mbReloadPressed to true  if mbErrorOccured is false and mbReloadPressed is true  it means webview loaded page successfully   Cause if error occurred again  mbErrorOccured will be set true on onReceivedError        Here is my full source  Check this out   public class MyWebViewActivity extends ActionBarActivity implements OnClickListener        private final String TAG   MyWebViewActivity class getSimpleName        private WebView mWebView   null      private final String URL    http   www google com       private LinearLayout mlLayoutRequestError   null      private Handler mhErrorLayoutHide   null       private boolean mbErrorOccured   false      private boolean mbReloadPressed   false        SuppressLint  SetJavaScriptEnabled        Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity webview              Button  findViewById R id btnRetry   setOnClickListener this           mlLayoutRequestError    LinearLayout  findViewById R id lLayoutRequestError           mhErrorLayoutHide   getErrorLayoutHideHandler             mWebView    WebView  findViewById R id webviewMain           mWebView setWebViewClient new MyWebViewClient             WebSettings settings   mWebView getSettings            settings setJavaScriptEnabled true           mWebView setWebChromeClient getChromeClient             mWebView loadUrl URL               Override     public boolean onSupportNavigateUp             return super onSupportNavigateUp                Override     public void onClick View v            int id   v getId             if  id    R id btnRetry                if   mbErrorOccured                    return                             mbReloadPressed   true              mWebView reload                mbErrorOccured   false                        Override     public void onBackPressed             if  mWebView canGoBack                  mWebView goBack                return                    else               finish                       super onBackPressed               class MyWebViewClient extends WebViewClient            Override         public boolean shouldOverrideUrlLoading WebView view  String url                return super shouldOverrideUrlLoading view  url                       Override         public void onPageStarted WebView view  String url  Bitmap favicon                super onPageStarted view  url  favicon                       Override         public void onLoadResource WebView view  String url                super onLoadResource view  url                       Override         public void onPageFinished WebView view  String url                if  mbErrorOccured    false  amp  amp  mbReloadPressed                    hideErrorLayout                    mbReloadPressed   false                             super onPageFinished view  url                       Override         public void onReceivedError WebView view  int errorCode  String description  String failingUrl                mbErrorOccured   true              showErrorLayout                super onReceivedError view  errorCode  description  failingUrl                        private WebChromeClient getChromeClient             final ProgressDialog progressDialog   new ProgressDialog MyWebViewActivity this           progressDialog setProgressStyle ProgressDialog STYLE HORIZONTAL           progressDialog setCancelable false            return new WebChromeClient                  Override             public void onProgressChanged WebView view  int newProgress                    super onProgressChanged view  newProgress                                       private void showErrorLayout             mlLayoutRequestError setVisibility View VISIBLE              private void hideErrorLayout             mhErrorLayoutHide sendEmptyMessageDelayed 10000  200              private Handler getErrorLayoutHideHandler             return new Handler                  Override             public void handleMessage Message msg                    mlLayoutRequestError setVisibility View GONE                   super handleMessage msg                                      Addition Here is layout       lt RelativeLayout xmlns android  http   schemas android com apk res android  xmlns tools  http   schemas android com tools  android id    id rLayoutWithWebView  android layout width  match parent  android layout height  match parent   gt    lt WebView     android id    id webviewMain      android layout width  match parent      android layout height  match parent    gt    lt LinearLayout     android id    id lLayoutRequestError      android layout width  match parent      android layout height  match parent      android layout centerInParent  true      android background   color white      android gravity  center      android orientation  vertical      android visibility  gone   gt        lt Button         android id    id btnRetry          android layout width  wrap content          android layout height  wrap content          android gravity  center          android minWidth  120dp          android text  RELOAD          android textSize  20dp          android textStyle  bold    gt   lt  LinearLayout gt

User · Answer

override your WebViewClient method   Override public void onReceivedError WebView view  int errorCode      String description  String failingUrl        view clearView        view loadUrl  about blank   has side-effects  as it cancels the original URL loading

User · Answer

Try this    SuppressWarnings  deprecation     Override  public void onReceivedError WebView view  int errorCode  String description  String failingUrl             Your handling       Override  public void onReceivedError WebView view  WebResourceRequest req  WebResourceError rerr          if  Build VERSION SDK INT  gt   Build VERSION CODES M              onReceivedError view  rerr getErrorCode    rerr getDescription   toString    req getUrl   toString

User · Answer

The best solution I have found is to load an empty page in the OnReceivedError event like this    Override public void onReceivedError WebView view  int errorCode  String description  String failingUrl        super onReceivedError view  errorCode  description  failingUrl        view loadUrl  about blank

User · Answer

First create your own error page in HTML and put it in your assets folder  Let s call it myerrorpage html Then with onReceivedError   mWebView setWebViewClient new WebViewClient         public void onReceivedError WebView view  int errorCode  String description  String failingUrl            mWebView loadUrl  file    android asset myerrorpage html

User · Answer

You could use a GET request to get the page content and then display that data using the Webview   this way you are not using multiple server calls  Alternative you can use Javascript to check the DOM object for validity

User · Answer

I ve had to face this issue and also tried to solve it from different perspectives  Finally I found a solution by using a single flag to check if an error happened        extends WebViewClient        boolean error        Override     public void onPageStarted WebView view  String url  Bitmap favicon             showLoading true           super onPageStarted view  url  favicon            error    false     IMPORTANT             Override     public void onPageFinished WebView view  String url            super onPageFinished view  url            if  error                Observable timer 100  TimeUnit MICROSECONDS  AndroidSchedulers mainThread                         subscribe  data  - gt  view setVisibility View VISIBLE                        showLoading false                Override     public void onReceivedError WebView view  int errorCode  String description  String failingUrl             view stopLoading             view setVisibility View INVISIBLE           error    true                Handle the error               Override      TargetApi android os Build VERSION CODES M      public void onReceivedError WebView view                                  WebResourceRequest request                                  WebResourceError error             this onReceivedError view  error getErrorCode                    error getDescription   toString                    request getUrl   toString                This way I hide the page every time there s an error and show it when the page has loaded again properly   Also added a small delay in case      I avoided the solution of loading an empty page as it does not allow you to do webview reload   later on due to it adds that new page in the navigation history

[java] Prevent WebView from displaying "web page not available"

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