Develop Reference

is it possible to save/retrieve specific data from webview cache?

i load a web page in a webview that contains a form, i want to know if there is a way to save the data that user put in the form in the webview cache and auto fill it in his next visit?
this is all i have done for now.
webView.getSettings().setAppCachePath("/data/data/"+ getPackageName() +"/cache");
webView.getSettings().setAllowFileAccess(true);
webView.getSettings().setAppCacheEnabled(true);
webView.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT);

not sure if it's the right way but, what about running js script on webview to get form input values, navigating DOM tree of html or using selector with id ?
once you got them you can store them in your app and for repopulate, before loading the page in webview, you manipulate html (if you could) or you use another js script to set the values
i'm not sure but i thing cache is only for cachable values (images, css...) not for input

Loading local html with $.load

In my app, am loading a local html which is residing in SD card as
String extPath = getExternalFilesDir(null).toString();
String html = getHtml(extPath+File.separator+fileName); //it just reads html file and returns content as string
webvu.loadDataWithBaseURL("file://"+extPath+File.separator,html ,
"text/html","UTF-8", null);
the html file loaded in the web view (webvu) tries to load another html file with $.load ajax call
$.load("base.html",function(){ ... });
ajax load is throwing the below error. How can I resolve this
XMLHttpRequest cannot load
file:///storage/emulated/0/Android/data/com.example.sdcardwebview/files/sec.html.
Cannot make any requests from null. at null:1

I finally figured out the solution
The null origin issue happens only in JB, which supposedly has a webview based on new webkit which implements stricter same origin policy.
Hence the code in question works perfectly fine on all version of android below JB. To get the code work on JB, all we need to do is change web view settings. Just call
webView.getSettings().setAllowUniversalAccessFromFileURLs(true);

Get already loaded images from wevbiew

I want to get images from the web page and save them into the local storage. I can find all image URLs from the HTML, load that images from the server and save them. But I don't want to access to the server second time for the same information which is already in webview. So I want to know how I can load images from the webview?

You can set a WebView cache in a few steps. Take a look below.
WebView webView = (WebView) findViewById(R.id.your_webView_Id);
String cacheDir = getDir("your_WV_cache_dir", Context.MODE_PRIVATE).getAbsolutePath();
webView.getSettings().setAppCacheMaxSize(1024 * 1024 * 1); // 1 Mb cache limited size > webView.getSettings().setAppCachePath(cacheDir);
webView.getSettings().setAppCacheEnabled(true);
webView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK); // This constant is important to you. This way you can load daa from cache, if it was already downloaded once.
You might take a look to th other possible values to the constant above at the WebView.WebSettings official documentation.
Let me know if it works.

webview.loadData() won't load local images

I have an html page that's built dynamically. Some of the images come from an internet url and others i want to load from the Assets folder. The pages correctly renders the internet images, however, it just refuses to load local images. I'm tried many variations including the following and none will load the local images. If everything is loaded from the internet url, the entire pages renders correctly but I really don't want to go to the internet for static content that won't change. Any ideas?
String pageData="a bunch of html markup...";
//-- i had to remove the < from the img tag below to get by the spam filter on this forum-->
//--try 1-->
pageData += "img src='file:///data/data/(my package)/files/image1.png' alt='my image'>";
//--try 2-->
pageData += "img src='/data/data/(my package)/image1.png' alt='my image'>";
//--try 3-->
pageData += "img src=' src='data:image/jpeg;base64,'" + readAssetFileAsBase64("image1.png") + "' alt='my image'>";
//--try 4-->
explosives!
The page is rendered using..
webview.loadData(pageData,"text/html",null);
but I've also tried
webview.loadDataWithBaseURL("file://", s, "text/html","windows-1252" ,null);
I can't use .loadUrl() since the page is built dynamically. I suppose I could write the dynamic page out to disk the call .loadUrl() but that doesn't seem so efficient.

You need to make sure you load the html with a base url, although that base url doesn't need to be anything pertinent
webView.loadDataWithBaseURL("fake://not/needed", htmlString, mimeType, encoding, "");
and then you can reference things in the assets folder using something like this
file:///android_asset/image1.jpg
the "android_asset" path seems to be the thing you haven't tried yet. If your files are not in your asset folder then you need to serve them with a ContentProvider, see this tutorial from my site: http://responsiveandroid.com/2012/02/20/serving-android-webview-resources-with-content-providers.html

Android: Easiest way to make a WebView display a Bitmap?

I have some images that I loaded from a remote source stored in Bitmap variables and I want to display them. In addition to switching between these images the user should also be able to zoom and pan them. My first idea was to somehow pass them via an intent to the built-in gallery application but this doesn't seem to be possible.
A solution that is suggested in several places is using a WebView since it already supports zooming and panning.
My question is how does my Bitmap data get into the WebView? Do I have to write it to a file first, which I would have to remove again later, or is there an easier way?
Or are there even better ways to accomplish my main goal, which is displaying Bitmap data as zoomable and panable images?

You can just use webview to directly view your image remotely. You do not need to save anymore the image in a file.
Here is a sample code snippet.
myWebView.getSettings().setBuiltInZoomControls(true); //to get zoom functionalities
String url = "http://....."; //url of your image
String x= "<html><head><meta name=\"viewport\" content=\"width=device-width, minimum-scale=1.0\"/><style type=\"text/css\">html, body {margin: 0;padding: 0;} img {border: none;}</style><head><body style=\"background: black;\"><table><tr><td align=\"center\"><img src=\"" + url + "\" /></td></tr></table></body></html>";
myWebView.loadData(x, "text/html", "UTF-8");
About switching images, you can just change the value of the url and call the loadData again of the webview.

I wasn't satisfied with WebView after all so I ended up creating my own image viewing Activity. Further descriptions on how I did it can be found in this post on google groups.