Android Webview - Completely Clear the Cache

Question

I have a WebView in one of my Activities  and when it loads a webpage  the page gathers some background data from Facebook   What I m seeing though  is the page displayed in the application is the same on each time the app is opened and refreshed   I ve tried setting the WebView not to use cache and clear the cache and history of the WebView   I ve also followed the suggestion here  How to empty cache for WebView   But none of this works  does anyone have any ideas of I can overcome this problem because it is a vital part of my application       mWebView setWebChromeClient new WebChromeClient                    public void onProgressChanged WebView view  int progress                              if progress  gt   100                                      mProgressBar setVisibility ProgressBar INVISIBLE                                   else                                     mProgressBar setVisibility ProgressBar VISIBLE                                             mWebView setWebViewClient new SignInFBWebViewClient mUIHandler        mWebView getSettings   setJavaScriptEnabled true       mWebView clearHistory        mWebView clearFormData        mWebView clearCache true        WebSettings webSettings   mWebView getSettings        webSettings setCacheMode WebSettings LOAD NO CACHE        Time time   new Time        time setToNow         mWebView loadUrl mSocialProxy getSignInURL     time   time format   Y m d H M S       So I implemented the first suggestion  Although changed the code to be recursive   private void clearApplicationCache         File dir   getCacheDir         if  dir    null  amp  amp  dir isDirectory              try               ArrayList lt File gt  stack   new ArrayList lt File gt                     Initialise the list             File   children   dir listFiles                for  File child   children                    stack add child                              while  stack size    gt  0                    Log v TAG  LOG START    Clearing the stack -     stack size                     File f   stack get stack size   - 1                   if  f isDirectory      true                        boolean empty   f delete                         if  empty    false                            File   files   f listFiles                            if  files length    0                                for  File tmp   files                                    stack add tmp                                                                                 else                           stack remove stack size   - 1                                           else                       f delete                        stack remove stack size   - 1                                             catch  Exception e                Log e TAG  LOG START    Failed to clean the cache                        However this still hasn t changed what the page is displaying  On my desktop browser I am getting different html code to the web page produced in the WebView so I know the WebView must be caching somewhere   On the IRC channel I was pointed to a fix to remove caching from a URL Connection but can t see how to apply it to a WebView yet   http   www androidsnippets org snippets 45   If I delete my application and re-install it  I can get the webpage back up to date  i e  a non-cached version  The main problem is the changes are made to links in the webpage  so the front end of the webpage is completely unchanged

User · Answer

The only solution that works for me  if  Build VERSION SDK INT  gt   Build VERSION CODES LOLLIPOP MR1        CookieManager getInstance   removeAllCookies null       CookieManager getInstance   flush

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Simply using below code in Kotlin works for me  WebView applicationContext  clearCache true

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CookieSyncManager createInstance this            CookieManager cookieManager   CookieManager getInstance            cookieManager removeAllCookie

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To clear the history  simply do   this appView clearHistory      Source  http   developer android com reference android webkit WebView html

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use case  list of item are displaying in recycler view  whenever any item click it hides recycler view and shows web view with item url   problem  i have similar problem in which once i open a url one in webview   then try to open another url two in webview  it shows url one in background till url two is loaded   solution  so to solve what i did is load blank string    as url just before hiding url one and loading url two   output  whenever i load any new url in webview it does not show any other web page in background   code  public void showWebView String url           webView loadUrl url           recyclerView setVisibility View GONE           webView setVisibility View VISIBLE          public void onListItemClick String url      showWebView url      public void hideWebView               loading blank url so it overrides last open url         webView loadUrl              webView setVisibility View GONE           recyclerView setVisibility View GONE            Override public void onBackPressed         if webView getVisibility      View VISIBLE           hideWebView         else          super onBackPressed

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webView clearCache true  appFormWebView clearFormData   appFormWebView clearHistory   appFormWebView clearSslPreferences   CookieManager getInstance   removeAllCookies null  CookieManager getInstance   flush   WebStorage getInstance   deleteAllData

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To clear cookie and cache from Webview          Clear all the Application Cache  Web SQL Database and the HTML5 Web Storage     WebStorage getInstance   deleteAllData            Clear all the cookies     CookieManager getInstance   removeAllCookies null       CookieManager getInstance   flush         webView clearCache true       webView clearFormData        webView clearHistory        webView clearSslPreferences

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The edited code snippet above posted by Gaunt Face contains an error in that if a directory fails to delete because one of its files cannot be deleted  the code will keep retrying in an infinite loop  I rewrote it to be truly recursive  and added a numDays parameter so you can control how old the files must be that are pruned     helper method for clearCache     recursive   returns number of deleted files static int clearCacheFolder final File dir  final int numDays         int deletedFiles   0      if  dir   null  amp  amp  dir isDirectory              try               for  File child dir listFiles                         first delete subdirectories recursively                 if  child isDirectory                          deletedFiles    clearCacheFolder child  numDays                                        then delete the files and subdirectories in this dir                   only empty directories can be deleted  so subdirs have been done first                 if  child lastModified    lt  new Date   getTime   - numDays   DateUtils DAY IN MILLIS                        if  child delete                              deletedFiles                                                                            catch Exception e                Log e TAG  String format  Failed to clean the cache  error  s   e getMessage                          return deletedFiles           Delete the files older than numDays days from the application cache    0 means all files      public static void clearCache final Context context  final int numDays        Log i TAG  String format  Starting cache prune  deleting files older than  d days   numDays        int numDeletedFiles   clearCacheFolder context getCacheDir    numDays       Log i TAG  String format  Cache pruning completed   d files deleted   numDeletedFiles        Hopefully of use to other people

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CookieSyncManager createInstance this       CookieManager cookieManager   CookieManager getInstance     cookieManager removeAllCookie      It can clear google account in my webview

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I found the fix you were looking for   context deleteDatabase  webview db    context deleteDatabase  webviewCache db      For some reason Android makes a bad cache of the url which it keeps returning by accident instead of the new data you need  Sure  you could just delete the entries from the DB but in my case I am only trying to access one URL so blowing away the whole DB is easier   And don t worry  these DBs are just associated with your app so you aren t clearing the cache of the whole phone

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I found an even elegant and simple solution to clearing cache   WebView obj  obj clearCache true     http   developer android com reference android webkit WebView html clearCache 28boolean 29  I have been trying to figure out the way to clear the cache  but all we could do from the above mentioned methods was remove the local files  but it never clean the RAM   The API clearCache  frees up the RAM used by the webview and hence mandates that the webpage be loaded again

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This should clear your applications cache which should be where your webview cache is  File dir   getActivity   getCacheDir     if  dir    null  amp  amp  dir isDirectory          try           File   children   dir listFiles            if  children length  gt  0                for  int i   0  i  lt  children length  i                      File   temp   children i  listFiles                    for  int x   0  x  lt  temp length  x                          temp x  delete                                                    catch  Exception e            Log e  Cache    failed cache clean

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context deleteDatabase  quot webview db quot    context deleteDatabase  quot webviewCache db quot    Did the trick

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Make sure you use below method for the form data not be displayed as autopop when clicked on input fields   getSettings   setSaveFormData false

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To clear all the webview caches while you signOUT form your APP   CookieSyncManager createInstance this            CookieManager cookieManager   CookieManager getInstance            cookieManager removeAllCookie      For Lollipop and above   CookieSyncManager createInstance this            CookieManager cookieManager   CookieManager getInstance            cookieManager removeAllCookies ValueCallback

[android] Android Webview - Completely Clear the Cache

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