I am working on a webview with local html file as source.
I am trying to copy a Webview on to another webview.
If I do this.
WebView1.loadUrl(webView2.getUrl());
I works, but it is same as loading the webview again,which i dont want. If I do this
WebView1=WebView2;
It doesn't copy. The content of WebView1 doesn't change. Am I doing anything wrong.
You'll have to remove the current WebView from your Layout (by calling removeView(WebView1) on it's container) and then add the new WebView to it (addView(WebView2) on the same container). Obviously you'll have to take care that it gets inserted at the right place again. Easiest way would be to just wrap a FrameLayout around it and call said methods on it.
Can't promise you that this will work though, since I don't know how WebView behaves offscreen.
Related
I am working on a newsreader app in which we have a Webview to display news details. Can I add an Admob layout between the contents inside this webview?
Basically, it should look like this,
-Webview
-Paragaraph1
-Admob layout
-Paragraph2
-Webview
There should be only one webview and the Admob layout should be inside the webview, placed between content.
I tried with splitting the html content and loading them in multiple webviews inside a Recyclerview. But its affecting the performance a lot.
Any help regarding this would be appreciated.
I think it isn't possible and also it isn't a good practice as you are adding your ads on someone else's data.
And if it is your data you can always change the HTML page
I have a WebView I'm loading in an activity in order to have it preloaded so that it pops up immediately in a different Activity (launched from the first).
The problem is that in order to instantiate a WebView, I have to pass in a Context, in this case it's the first mentioned above.
So it works great, and the second Activity shows the WebView just fine. The problem is that if I click a <select> dropdown in the WebView, its selector dialog shows up UNDER the WebView. It feels like the select doesn't work at all until you hit the back button and briefly see the selection dialog just before you return to the parent activity.
It seems as though when I append the WebView to the layout in the second activity, it's modals get attached to that activity's window, but the WebView itself is attached to the parent activity's window, so it shows in a higher point in the hierarchy.
How can I possibly change the Context of the WebView after it's been instantiated?
This is a very difficult problem to solve -- I have to create the WebViews before the activity is started, but I also need the selection dialogs to work.
Please if anyone can give me some insights here I'd greatly appreciate it.
This is for an SDK project, so I will not have access to the parent activity. Also, saveState isn't working, because the bulk of what is shown in the WebView is generated by JavaScript, and the full DOM stack doesn't transfer.
You can try to create the WebView with a MutableContextWrapper:
MutableContextWrapper mMutableContext=new MutableContextWrapper(context);
WebView mWebView=new WebView(mMutableContext);
and later on you could do
mMutableContext.setBaseContext(newcontext);
But ...
WebView is a very complex component that will probably be using the passed context to create other objects like Handlers. WebView probably uses those handlers to post stuff to the original UI thread, so at the end you'll probably have a View with a mix of contexts, you know, a double memory leak (if it ever works properly)
Webview spans at least 1 thread "webcore" that is where the action happens and is also in constant communication with the original UI thread with ... handlers? through the original context? who knows!
There are even 2 different webview engines: Kitkat is chromium-based while jelly bean and previous versions use AOSP/WebView. So you have an additional breaking point.
The reasons you state are not strong enough imho. WebView is not that slow. If the app you load is, try to optimize it. There are a lot of things you can do for that, like loading the HTML & graphics from internal assets.
In my App (it's browser) I have the same problem. I don't like to load WebView every time when user back to App. And I've solved this problem partially. I've overridden onBackPressed() on my HomeActivity and use moveTaskToBack(true) instead of super.onBackPressed(). So when user use system back on HomeActivity it does't destroy Activity and all views. It just minimize the App. Visually it's the same behavior but if user try to run App by launch icon, all views already loaded. I know it's temporary solution and all views can be destroyed by system any time but it gives quite good result. And covers a lot of cases for me.
I have a simple Activity to show a webview and a back button. Here is the code that I use to load the URL that I want in the webview.
The webpage that I am loading in on a server online, it has a few form elements plus a few links that when clicked I need to keep loading them inside the webview.
Now the problem is very often the page loads without the images, I can see the form elements though or only blank white page. I am testing this on wifi so internet is working fine.
Why is it not loading images and how can I make sure it does? I even tried making all images in the html page have absolute paths, but that did not help.
Later Edit: I found out what was causing this. Maybe others will run into this. I had this in the manifest file android:hardwareAccelerated="true". After removing it the content inside all the webviews is loading smoothly.
Second later edit: It is terrible, I get the initial page load now, but forms are not submitting and after some going back and forward to the webview, new images do not load anymore. Is it a memory problem? How do I make it start fresh every time?
WebView wv = (WebView) findViewById(R.id.webview);
wv.getSettings().setBuiltInZoomControls(false);
wv.getSettings().setJavaScriptEnabled(true);
wv.setWebViewClient(new WebViewClient());
wv.loadUrl(filepath);
I'm embedding some HTML content (stored locally) in my android application and using a WebView to render it. I'm finding that I always "see" the HTML content being loaded (ie. white bg before the page is rendered), even though it's located as an "asset" inside the app.
To mask this "issue", I'm currently hiding the WebView, sub-classing the onPageFinished() method and showing a ProgressDialog until I the page completes. Which is annoying coz we're only talking seconds here.
I've seen suggestion of using the following:
webview.getSettings().setRenderPriority(RenderPriority.HIGH);
webview.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
...but this doesn't seem to help.
Has anyone managed to overcome this?
(If I could change the WebView's initial bg colour, it might be an improvement, but not ideal)
Many thanks.
I'm developing an application which is mainly a webview and will display a JQTouch UI. Two of the 3 views work just fine, however, I have a view which loads another page with a form which does not work at all. This view loads up just fine but when I click the link to go to the form the link just stays highlighted and nothing happens. I have overriden all of the methods in webviewclient and webchromeclient and placed breakpoints within with no luck. None of the hooks catch when I click the links.
The part that truly confounds me is that it works in the phones browser but not in my webview. Is there a setting on webview that I may be missing which would make it act like the phones browser?
Any help or suggestions would be appreciated.
The fix for this was to override onLoadResource as the link was being treated as a resource and not a new page load. I tried calling webView.loadUrl right in the override of loadREsource but that caused an endless loop so I had to write some logic to load the url properly into my webView. This seems a bit hacked but it works.