Android : WebView - Not Able To Go Back To My Activity Screen Once The Content Is Displayed

Apr 9, 2009

Step 1: I am subclassing WebView and rendering html content properly. The intial content is very small with a div and image /link This is displayed in a LInear Layout along with a TextView and ListView. That is my first screen/activity of the application.

Step 2: When I click on a link on this webview, it goes through the webViewclient and expands to full screen to fit the content of the requested page.

After Step 2, I am not able to go back to my activity screen once the content is displayed. When I click on the back button to getback to my activity screen close my activity and goes to the phone's applications desktop. (i.e goes out of my application).

Step 3: In order to fix this issue, I stopped setting my own subclasssed WebViewClient. After doing this, the it seems to render the clicked page in a webView as subactivity. Now When I click on backbutton, it goes back to the activity screen. But, the issue now is, I am not catch event when a link is clicked. How can I catch click events in this case.

Android : WebView -  not able to go back to my activity screen once the content is displayed


Android :: Way To Find Height Of HTML Content Displayed In A Webview?

Apr 8, 2009

My application generates an HTML file which needs to be displayed to the user . For this purpose I'm using the loadData() API provided by Webview. This HTML file is updated every 2 secs & the same is loaded again using loadData() to display the updated values. On reloading the file the Webview starts displaying again from the top of the file causing the user to always scroll down to the location where he previously was. This causes a very bad user experience. To overcome this issue an alternative that I could think of was to split the file to multiple files that can exactly fit in the the screen. For this I need to find the height of the HTML content that can loaded in a web view. From the WebView documentation I found that an API getContentHeight() is provided for this purpose. Although this method returns me 0 on the first attempt. On subsequent attempt it gives me the height of the page that was previously loaded.

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Android :: Pause Flash Content In WebView When Activity Isn't Visible?

Aug 7, 2010

I am experimenting with using a WebView to display Flash content inside my activity. Everything is working pretty well, but when the user hits the home key to put the activity into the background, the Flash content keeps running (sound keeps playing, etc)

I have noticed that both the stock Android browser and Dolphin Browser seem to avoid this problem, and properly pause the Flash content when the browsing activity is put into the background.

Ideally I would like a solution that kills the WebView completely if the activity is finishing, but pauses it otherwise (basically copying the default behavior of the browser)

Here is a simple test I put together that loads a game on Kongregate which has some background music:

CODE:..............

I took a look at the latest source for the stock browser, and it seems to be doing something similar (calling pauseTimers/resumeTimers), although I fear the code I have been looking at is out of date, because it is calling functions that don't seem to exist anymore.

I did verify that the call to pauseTimers is working by testing with a simple JavaScript setInterval which updates a counter. Is there something else obvious that I should be trying in regard to Window or View management?

The documentation for the mobile Flash player says:


Flash Player will also automatically pause SWF playback it is not in view or the foreground application, for example when a call is received or alarm goes off, to reduce CPU utilization, battery usage and memory usage.


This seems to be working perfectly in both the stock browser and Dolphin Browser, but not in my app. Any ideas/solutions would be greatly appreciated!

Update: Here is the function we ended up adding to our activity to get this to work. We call it with "onPause" in the activity's onPause function and "onResume" in the activity's onResume function:

CODE:....................

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Android :: WebView Content To Fit Display Screen

Oct 5, 2010

I tried WebView.getSettings().setLayoutAlgorithm(LayoutAlgorithm.SINGLE_COLUMN); but view crashed in 1.6 OS. I calculate scale(webview.capturePicture()) but I cannot set it after page loaded. Is it any working solution for fitting webview content to display (1.6 OS)?

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Android :: WebView Wrap Content To Fit In Screen

Jan 2, 2010

Is it possible to Load a URL in a webView and resize it to fit the screen. I mean I want to make the WebPage small so that the user doesn't need to scroll.

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Android :: Back To Activity After WebView?

Nov 14, 2009

I've been searching and looking for this answer for quite some time now. I want to display a little HTML in a webView.

When the User read the HTML, he's supposed to use the back button to go back to the previous activity. However, it closes the App.

How can I make it go back to the last Activity? It would also be ok to display a soft back button or something. Here my code...

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Android :: Get Foreground Activity Displayed On Screen

Apr 22, 2009

Is it possible to get listed the apps or activity which are actually displayed on the screen of the android mobile. I need to display a text box on some event when no acitivity is displayed, excepting the home screen.

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Android :: Activity Is Displayed After User Unlocks The Screen

Mar 31, 2010

I was wondering if anyone understood how to make your application be displayed when you unlock the screen. I have an application where the user turns on a Bluetooth device, it connects to the phone, and the user should be presented with a UI. Having them hunt for the app or using the notification menu is not a workable option (too much work and not the obvious behavior).

The problem is that:
When the screen is unlocked:
- you can popup the activity from the background service when Bluetooth connects to a device
- User is happy because the UI is right there

When the screen is locked:
- The application gets started but is destroyed
- User unlocks the phone and nothing is there but the homescreen

One work around would be to disable the keyguard when the application gets woken up but the nuclear option is a pretty bad option. I know the standard Android assumption is that you shouldn't do this. In the normal case this behavior is fine, but in this case I explicitly did something I want the phone to respond without adding more work for the user to do. As per Google's guidelines if you don't like this behavior there can be an option for you to turn this off or you can not use the application.

A few more details, so after looking at this a bit more the problem isn't necessarily that you can't have an activity running when the screen is locked, unlock and expect it to be waiting. That does work if you do something like the following: lock your device run an app through Eclipse while the phone is locked/off unlock and it will be waiting for you.

But in the case the Activity is already running and I'm brining up a new window (which happens to be a transparent one, saying you're connected and asking what they want to do).

The problem is that it gets killed

CODE:..................

The setup here is as follows:

MyBackgroundService is a serivce that handles Bluetooth state (waits for connections, turns on Bluetooth if the user starts the app, etc.). It triggers a popup BackgroundPOPUP activity that runs a ViewFlipper.

MyBackgroundService starts BackgroundPOPUP through an intent.

BackgroundPOPUP is an activity with a Translucent theme (Theme.Translucent to be precise), it shows a ViewFlipper with some instructions and presents some options.

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Android :: How To Clear Activity From Second Activity Going Back To Home Screen?

Mar 3, 2010

example scenario is: from login screen - main screen - then when i clicked a hide button the app will go to home screen, and when im going to click the app again the main screen would be called.

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Android :: How To Show A Webview Inside An Activity In Middle Of Screen

Jul 30, 2010

I am having issue while showing a WebView in an activity in the middle of the screen. I have an activity and I want to show a webview in the center of screen. My activity is transparent so background activity will be visible. Whenever I try to create a webview and add it to activity using setContentView(webview) it always shows the view on the top left corner of the screen. Is their a way to workaround this?I am trying to do this via pure code only.

Here is my code.

CODE:....................

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Android :: Where JavaScript Exceptions Displayed When Using WebView

Feb 9, 2010

I have this simple HTML that I load into an Android WebView (SDK version 1.5)-

<html>
<body onload="nomethod()">
<h1>Hello World</h1>
</body>
</html>

Function nomethod() doesn't exist but the LogCat doesn't display any error. It seems that any exception that isn't caught cannot be traced. how can I handle or trace uncaught exceptions?

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Android :: Image Displayed At Webview From Url With High Quality Loss

Mar 17, 2010

I want to display an image from an url with an Webview at Android. With Android phones with Version 1.5 and 1.6 there is no problem. but the same pic and the same code on an AndroidPhone with Version 2.0 and the pic is totaly pixelated. Like Android is resizing the image first to a smaller one and then resizing it back to "normal" size. Unfortunately its important to display the pic without any quality loss. I tried to integrate it in the sourcefolder to show it as an normal image, but at Android 2.0 i get an exception because the image is to big. (At Android 1.6 there is no problem) Any ideas how i can display the image without quality loss with Android 2.0 ?

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Android :: Listbox Displayed Only As Combobox In Webview / Get It Working On Emulator?

Sep 15, 2010

I am developing an android application using phonegap and javascript code. I need a listbox with four options displayed at once. My html code similar to one listed below, always shows up as a combobox on the emulator inspite of the size parameter being greater than one. Can someone guide how to get a listbox working on the emulator. code...

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Android :: Content Rendering For WebView

Jul 15, 2009

Can anyone help me to understand how WebView decided which content it can render and which it can't? For example I am inside a webview select a link and if the link sends an XML file I want my application to handle to data instead of WebView, Is this possible?

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Android :: How To Get WebView Content Into Bitmap?

Sep 9, 2009

I am trying to get the webview's content on a bitmap so that i can save it as a image. But I am unable to so. I am getting the BLACK image save instead. All content is missing. Here is my code:
//create a webview WebView w = new WebView(this);
//Loads the url w.loadUrl("http://www.yahoo.com");
//After loading completely, take its picture Picture picture = w.capturePicture();
//Create a new canvas Canvas mCanvas = new Canvas();
//Draw the Picture into the Canvas picture.draw(mCanvas);
//Create a Bitmap Bitmap sreenshot = Bitmap.createBitmap(picture.getWidth(), picture.getHeight(),Config.ARGB_8888);
//copy the content fron Canvas to Bitmap mCanvas.drawBitmap(mBitmapScreenshot, 0, 0, null);
//Save the Bitmap to local filesystem if(sreenshot != null) {
ByteArrayOutputStream mByteArrayOpStream = new ByteArrayOutputStream();
screenshot.compress(Bitmap.CompressFormat.JPEG, 90, mByteArrayOpStream);
try { fos = openFileOutput("yahoo.jpg", MODE_WORLD_WRITEABLE);
fos.write(mByteArrayOpStream.toByteArray()); fos.close();
} catch (FileNotFoundException e) { e.printStackTrace();
} catch (IOException e) { e.printStackTrace(); } }

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Android :: Getting WebView Content Or Cookies

Mar 23, 2010

Is there a way to get the current content of a WebView? What about Cookies for a specific host+url?

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Android :: WebView.clearHistory() - Don't Want Back Button To Allow User To Go Back Further Than Current Session

Mar 31, 2009

I call WebView.clearHistory(), but I am still able to go back after doing so. I want to reuse a WebView, but I don't want the back button to allow the user to go back further than the current "session" of using the WebView. Anybody know what is the best way to handle this? I thought for sure that clearHistory() would do it.

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Android :: How To Mix External / Local Content In WebView?

Oct 12, 2009

I am trying to create a hybrid Android app which pulls HTML content from a web server and renders it in a WebView. However, I also want the external HTML to be able to reference images that are packaged within the android app. I realize that currently it is not possible to do something like <img src="file:///my_image.jpg" /> in the HTML. I have seen discussions of using the ContentProvider to create name spaces in the html, however all of these examples seem to assume that the actual html page is also on the device and tend to use WebView.loadData(). So, is there someway that it is possible to do this? The main goal is to package all the application images/css in the android app, but put the bulk of the application on an external server that returns the actual markup.

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Android :: Placing Webview Control In Tab Content?

Oct 18, 2009

When I place a Webview control in the content of a Tab, it is taking over the entire display! I have jacked around with the layout but I can't figure out how to "fit" the control on the tab. Is it possible to do this?

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Android :: How To Get Current Page Content Of WebView?

Feb 10, 2009

It's easy to get current page's url and title of webkit.WebView. But I could not find way to get page content of WebView.

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Android :: Playing YouTube Content In WebView

Oct 7, 2010

I have Java and plugins enabled. Why I can play many online flash videos in my webview, but nothing on m.youtube.com works? I would be more than satisfied with a workaround that passes the video to the YouTube application.

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Android :: Any Listener For When WebView Displays Content?

Oct 31, 2010

Using WebViewClient and/or the WebChromeClient you can get a listener for when the page has loaded, however this is sometimes called before the WebView has any content in it, before it has displayed anything. What would be a efficient method for determining when the WebView has displayed it's content? When I load a page in a WebView, I want to set the scroll to a specific position. It seems that the scroll position cannot be set until the page is loaded and it has an actual content height. So, I have tried two different approaches to determining when the page has finished loading, onPageFinished() from the WebViewClient and also onProgressChanged() from the WebChromeClient.

Both of these tell me when the page has finished loading. However, the problem is that sometimes it is called before the page has been displayed and therefore the page has no height and the scroll call does nothing. I am trying to find a solid way to determine when the page is ready to be scrolled, i.e. when it has its content height. I imagine I could setup a checking loop after it finished loading to keep looking for when the height is available but that seemed like quite the hack. Hoping there is a cleaner way.

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Android :: Got WebView - In Its Content Is A Phone Number

Mar 6, 2009

I've got a WebView, and in its content is a phone number. I hightlight it and click - voila, taken to the phone app.

Now, all I do is add this code:

CODE:........

clicks no longer work.

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Android :: Formatting WebView Content (Text Display)

Mar 12, 2010

I am getting some HTML text from a remote server which I am displaying inside a WebView. I need to format the text display and set a font size and color for the WebView. The only way I can think of is: pre-pending the HTML string received with a tag and specify the font information there. What is the correct way to do this?

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Android :: Save WebView Content For Offline Browsing

Nov 8, 2010

I would like to implement an apps that allow users save the webpage including images. Then the users can view the web page again even there is no network access. However, I found that there is no such related API to do so.

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Android :: Deactivate Mobile Content From Website In WebView

Nov 8, 2010

My code:
WebView webView = new WebView(this); webView.getSettings().setJavaScriptEnabled(true);
webView.loadUrl("http://www.preisjaeger.at"); setContentView(webView);
The site the I downloaded appears on the Webview, but only the content for mobile devices. How to deactivate the mobile content?

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Android :: Using Webview Control To Show The Html Content

Nov 15, 2010

I am using the webview control in android to show the html content. But I face a problem that in webview I have to fix the height so thats why if html content contains less data then it wasted the space. Is there any solution to solve this problem that how can I show only same content as html has in the webview without any wasted space please help. following xml i used to draw webview is this right? In this i give fix height to webview. if i am not giving fix height then it will show only 1 line data with scroll.

CODE:.....................

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Android :: Activity State On Pressing Back And Home Button On Screen

May 6, 2009

Whenever I press the home button when Im in the root task of my application and when I click on the icon of my app again the state of my task (activity) is retained, but when i press the back button on the emulator and when I open my application its state is not retained. I want the state to be retained in both the scenarios.

In the mnifest I have given the below entries,

android:alwaysRetainTaskState="true" for the root activity

android:launchMode="singleTask" for the application

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Android :: Activity Can't Be Displayed From A Notification

Apr 9, 2009

When MountService received event from HAL and start a notification, it would display an AlertActivity after user's click. However, I found the AlertActivity is created and can't be displayed.

I got some log as below:

CODE:........

Is it related to "FLAG_ACTIVITY_NEW_TASK"? however, how to solve it?

I've tried to use "launchmode as singleTask", but is doesn't work.

Is there anyone give me a hand? Why my activity can be created but can't be displayed?

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Android :: Make Sure An Activity Is Displayed Before Another?

Aug 19, 2010

I have some activities and I have to display a fullscreen ad image before displaying the activity... all my activities extends a custom activity and I thought it was a great idea to implement that advertisement there, so I did: code...

This works nice... the ad is displayed for 3 seconds and it closes automatically. The problem is that the activity that should be hide for the ad is being created faster, so the user can see it for a second before the ad is created. How can I avoid that behavior? How to make sure the ad activity starts before the another does?

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