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 >= 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 && dir.isDirectory()) {
try {
ArrayList<File> stack = new ArrayList<File>();
// Initialise the list
File[] children = dir.listFiles();
for (File child : children) {
stack.add(child);
}
while (stack.size() > 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.
Simply using below code in Kotlin works for me
WebView(applicationContext).clearCache(true)
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);
The only solution that works for me
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP_MR1) {
CookieManager.getInstance().removeAllCookies(null);
CookieManager.getInstance().flush();
}
CookieSyncManager.createInstance(this);
CookieManager cookieManager = CookieManager.getInstance();
cookieManager.removeAllCookie();
It can clear google account in my webview
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.
context.deleteDatabase("webview.db");
context.deleteDatabase("webviewCache.db")
Did the trick
webView.clearCache(true)
appFormWebView.clearFormData()
appFormWebView.clearHistory()
appFormWebView.clearSslPreferences()
CookieManager.getInstance().removeAllCookies(null)
CookieManager.getInstance().flush()
WebStorage.getInstance().deleteAllData()
Make sure you use below method for the form data not be displayed as autopop when clicked on input fields.
getSettings().setSaveFormData(false);
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.
To clear the history, simply do:
this.appView.clearHistory();
Source: http://developer.android.com/reference/android/webkit/WebView.html
CookieSyncManager.createInstance(this);
CookieManager cookieManager = CookieManager.getInstance();
cookieManager.removeAllCookie();
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();
This should clear your applications cache which should be where your webview cache is
File dir = getActivity().getCacheDir();
if (dir != null && dir.isDirectory()) {
try {
File[] children = dir.listFiles();
if (children.length > 0) {
for (int i = 0; i < children.length; i++) {
File[] temp = children[i].listFiles();
for (int x = 0; x < temp.length; x++) {
temp[x].delete();
}
}
}
} catch (Exception e) {
Log.e("Cache", "failed cache clean");
}
}
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();
}
}
Source: Stackoverflow.com