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)-

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

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?

Android :: Where JavaScript exceptions displayed when using WebView

Android :: WebView And Javascript

Sep 14, 2009

I have a WebView in my activity opening html file, containing a simple javascript. My problem is that the webview opens the html file, but doesn't execute the javascript. When i open the file from web browser, and not from my app, it executes the javascript correctly. What could be the difference? Are there any different settings for running javascript?

Here is my file:


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Android :: JavaScript Problem In Webview

Apr 12, 2010

I have a JavaScript function which returns a value and i want to use that value in my Android program.

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Android :: Webview Javascript Injection

Sep 17, 2010

I'd like to call a JavaScript function out of Java.

Well, the following source code works fine for me (http://

This is not called on the UI thread. Post a runnable to invoke


My problem now is to use a parameter for the JavaScript function.

Let's assume I've got some XML (just like AJAX somehow).

I need to escape it just like the iPhone / Objective-C command stringByEvaluatingJavaScriptFromString does.

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Android :: Better JavaScript Debugging For WebView

Mar 4, 2009

I'm debugging a Javascript+HTML app. All the content is in ./assets.

The app works fine in Firefox, Safari and iPhone (over the web).

But in the WebView, I only get: D/WebCore (626): Console: undefined line: 0 source: undefined

I need to debug this code. Could I either: - enable more debugging in the WebView? though I think this needs to be done in the framework. or: - set up a desktop WebView equivalent where I can run a Javascript debugging tool?

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Android :: Return Value From Javascript In Webview

Jul 21, 2010

I want to get a return value from javascript in android. With Iphone, i can do it, but Android, i can't. I use loadUrl but return void not object.

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Android :: Webview Cannot Handle Javascript

Aug 10, 2010

My android application displays webpages(i used webview for it). .but javascript onthe wepage is not running in a webview .If i visit the same webpage through the Browser,javascript is running . How to run javascript in an application(using a webview)?

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Android :: Evaluate Javascript Value On WebView

Nov 10, 2010

I open a webview page that page have:


These javascript
When I press a button on the webview I have to read the "iPhoneStatus" value and close the webview screen and decide the result.

I wrote these codes in my .java class


But it never go in the onJsAlert method, is there any way to evaluate the value of GetStatus()

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Android :: Image Included Javascript Not Appear In WebView

Jan 3, 2010

I used webView to show javaScript,one image was included in the javaScrip,but the webView not run the image on the contrary appear a "?"image.

My code:


I put android_normal.png and android_waving.png in the assets and drawable folder

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Android :: Can't Load Image In WebView Via Javascript

Jun 3, 2010

My app uses a WebView widget to load ads from Google AdManager. AdManager gives you an HTML snippet, which is 90% javascript to call their server for the image to load.

I put their html snippet into a string and use String.format to add in several variables that AdManager requires.

I enable javascript on the WebView (webView.getSettings().setJavaScriptEnabled(true);)

I load the string into the WebView (webView.loadData(myString, "text/html", "UTF-8");

result: the ad never loads (although the WebViewClient shows serveral .js resources loading).

If I take that exact string and create a file and then use webView.loadUrl("file:///android_asset/test.html"), the image loads properly.

Why would loadUrl work but loadData does not?

I've verified that javascript is running. I injected a little script to write out a text string and it works.

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Android :: Opening Page With Javascript Pop Ups In Webview

Sep 27, 2010

I am very new to both android webkit and javascript. I have a web page with 3 links (say A,B,C). When I open that page on my PC browser(Chrome), and click on the links, A opens in the same browser window whereas B and C pops up a new window. In my application I am loading the original URL in a WebView. I have implemented my WebViewClient and overridden the shouldOverrideUrlLoading. I am getting the call to shouldOverrideUrlLoading whenever I click on A, but not getting it when I click on B or C?

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Android :: JavaScript Sometimes Doesn't Work In Webview

Jul 22, 2010

I put a webview in my application to visit a webpage which includes some javascript functions, my purpose is when users click a link in the webpage, it will start a new activity in the application. I've written "webSettings.setJavaScriptEnabled(true);" in my source codes.

It works well in most of the time, however sometimes it doesn't work, there is no response when users click, and I don't know why because the environment is not changed at all.

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Android :: WebView Playing Audio With Javascript

Sep 25, 2010

I'm trying to very quickly port over an html application with plays sound (with soundmanager2) to a native android app using WebView. From my research, I haven't seen any evidence that sound, such as mp3s, can be played via javascript or any other methods using WebView.

My goal now is to quickly port over the html app and then eventually create a truely native application without using WebViews.

If anyone has been able to successfully implement playing audio using WebViews and Javascript or if this is just not possible at this time.

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Android :: Webview - Possible To Execute Javascript From Java Synchronously

Apr 6, 2009

I am writing a hybrid web/native app and ran into issue. My app downloads a music file via Java code, and needs to update a Javascript download progress bar in the WebView in real time.

My understanding is the only way to call Javascript from Java is via the WebView's loadUrl method.


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Android :: WebView - Documentation Of JavaScript And Java Interaction

Sep 30, 2010

I have found that there is a significant lack of documentation of WebView's ability to communicate with Java via WebView.addJavaScript() method. First, the debug document appears to no longer work. Second, what object types should we expect when going to and from JavaScript. I have done some trial and error and it appears that complex types can cross the boundary, for example java.util.Vector. However when a Java method returns a byte array to JavaScript it has a type of undefined and I have been unable to coerce it to any other type. Finally, there is great potential with this interface and with some more attention we could go far.

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Android :: Use WebView To Evaluate Javascript String And Return Value

Dec 1, 2009

Given that scripting is not natively supported in Android and wrapping libraries like javax.script.ScriptEngine into your app will make it too large, is it possible to send a javascript string to an invisible WebView and have it evaluate the string and return you the results (another string)?

I want to go this route because I want to save all my scripts to disk so my app can remain small.

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Android :: Javascript Problem With Webview Runing Under HTC Desire

May 31, 2010

I am developing an application with Webview. The web app that runs inside the Webview is loaded from internet, and it is a single HTML file. I use javascript for showing and hiding the divs, depending on the section button the user had tapped on.

The problem is simple: after a little while (this time period seems to be random), javascript stops working inside the Webview object. Then, after a few seconds (10-30 seconds), javascript works again. It doesn't work any javascript. Nothing.

The strange thing is that the problem only happens when the application runs in a HTC Desire. I tested it in two different HTC Desire, and the problem happens in both devices. I tested it in a Motorola Milestone, in a HTC Hero and under emulator (1.5,1.6,2.1) and the application works fine, no error at all.

The problem happens using Wifi or mobile network.

I tried the debugger, but "Dev tools" crashes when I tap in "Development Settings". I also tried to compile the application for debugging under Eclipse, but adb does not show me info about the WebView object.

The HTC Desire firmware version is 2.1-update1. Kernel version: 2.6.29-3cb3dfbf. Build number: Webkit 3.1

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Android :: Pass Javascript Function To Java Using Webview AddJavascripInterface

May 12, 2009

I made a webview.addjavascriptinterface(geo, "geo"); to access the geo class from javascript, and, in the html-javascript I write: --------- function successCallback(p){ document.write("helo"); }

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Android :: Detect Click On HTML Button Through Javascript In WebView

Oct 31, 2010

I'm not highly familiar with javascript but I think this is the best way to accomplish my purpose. If not, please correct me. I have a licence text 2 buttons at the end. All of this is written in HTML in a WebView because there are some links in the licence. Now, I want that when the user clicks the "ok" button in the WebView, this triggers some javascript or listener that I can grab in Java to fire an Intent to go forward in the application. (The cancel button would do the opposite, but if I know how to do one, I can do the other. Does this rings any bell to someone? Any explanation or sample code is welcome.

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Can't Parse JSON In Webview Via JavaScript

Sep 4, 2013

I am trying to parse some JSON Code in the webview of an android app; but it is completely failing.

var test = JSON.parse(base64_decode(emails[i]));
and the results:

I have tried using JSON2, and JQueries parseJSON function; both have returned the same error;

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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 :: 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 :: 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 : 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.

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Android :: Android WebView Not Loading A JavaScript File But Android Browser Loads It Fine

Jun 3, 2010

I'm writing an application which connects to a back office site. The backoffice site contains a whole slew of JavaScript functions, at least 100 times the average site. Unfortunately it does not load them, and causes much of the functionality to not work properly. So I am running a test. I put a page out on my server which loads the FireBugLite javascript text. Its a lot of javascript and perfect to test and see if the Android WebView will load it. The WebView loads nothing, but the browser loads the Firebug Icon. What on earth would make the difference, why can it run in the browser and not in my WebView? Any suggestions.
More background information, in order to get the stinking backoffice application available on a Droid (or any other platform except windows) I needed to trick the bakcoffice application to believe what's accessing the website is Internet Explorer. I do this by modifying the WebView User Agent.Also for this application I've slimmed my landing page, so I could give you the source to offer me aid. package ksc.myKMB;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.Window;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebSettings;
import android.webkit.WebViewClient;
import android.widget.Toast;
public class myKMB extends Activity {
I already have JavaScript on the web browser on, the problem is the web view is acting to different from the web browser.

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Android :: Widget Not Displayed In Android 2.0 - Initial Layout Displayed Only

Nov 1, 2009

Our application displays widgets that update every minute through Alarm. It works fine under 1.5 and 1.6 but since 2.0, widget is not displayed at all. Only initial layout is displayed.

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Android :: Catch Standard Exceptions

Aug 21, 2009

I want to listen the android standard exceptions to manage it. But I don't put try/cath in all my code. Anyone knows if i can redirect the error output to my code. I've seen this System.setErr method, but It doens't works for this purpouse.

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Android :: Exceptions With Calling Web Service Using IP

Nov 24, 2010

when I call web service from my machine using 'localhost' or , I got exception. But if I give the public IP, it works fine. Why it is happening?And also, If I use my public IP, I can't access web service. But If I put the same code in another machine, and call that web service using the IP address of that machine, It works fine.

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Android :: Catching Exceptions Globally?

Aug 12, 2009

In my application I would like to catch all exceptions globally - it should not matter, where those exceptions occur. Some runtime exceptions are practically impossible to catch (OutOfMemoryError for instance), but I want to show an informative dialog and resume execution at some well-defined point (main menu activity or something).

Using Thread.setDefaultUncaughtExceptionHandler() does this for background threads, but it is of no help in the UI thread (or adjacent handlers). If an exception occurs in the UI thread, the UI will be jammed - not reacting to any key or touch events anymore. Of course, this seems natural since it did not catch that exception; but I wonder if there is a way to recover the UI thread. So:

- Can I recover / restart the UI thread after an uncaught exception (from another thread) ?

- Is there another way to catch uncaught exceptions globally ?

- Are there viable alternatives to handle this problem ?

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Android :: Why Do I Constantly Get ActivityNotFound Exceptions

Aug 9, 2010

I'm a novice Android programmer, and to help me understand how Intents really work, I wanted to put together a small Activity which would let the user call startActivity() with any action and data they want. I tried many different combinations, including "android.intent.action.VIEW" and "". No matter what combinations I use, I always get an ActivityNotFoundException. Any ideas as to why?

The code in my only Activity is below....

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