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: 1.15.161.4 Webkit 3.1
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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:
CODE:.......
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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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Sep 17, 2010
I'd like to call a JavaScript function out of Java.
Well, the following source code works fine for me (http:// whyandroid.com/android/206-using-webviews.html):
This is not called on the UI thread. Post a runnable to invoke
CODE:............
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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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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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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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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Nov 10, 2010
I open a webview page that page have:
CODE:.............
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
CODE:..........
But it never go in the onJsAlert method, is there any way to evaluate the value of GetStatus()
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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:
CODE:..............
I put android_normal.png and android_waving.png in the assets and drawable folder
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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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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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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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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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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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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.
CODE:................
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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 http://developer.android.com/guide/developing/debug-tasks.html#Debugg... 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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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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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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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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Sep 4, 2013
I am trying to parse some JSON Code in the webview of an android app; but it is completely failing.
Code:
window.android.log(base64_decode(emails[i]));
var test = JSON.parse(base64_decode(emails[i]));
and the results:
[code]...
I have tried using JSON2, and JQueries parseJSON function; both have returned the same error;
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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.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.graphics.Bitmap;
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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Oct 18, 2010
I am going to develop an app runs on both Android and desktop, so UI will be built on html , javascript, css. User experience is very important, I am looking for a javascript UI framework has great UI, animation and response time. A great UI framework but slow (cause user annoying) is not acceptable in my case.There are many javascript frameworks available. Can you guys share the experience of how they behave on Android ？
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Sep 27, 2010
Does somebody send me code of using javascript with android and how to use wallpaper in android?
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Nov 18, 2010
Is it possible to use JavaScript in Android?? if so, how? Please provide some examples.
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Jul 21, 2010
I want to get a return value from javascript in webkit.
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May 12, 2010
I'm loading up a webview with some locally generated html and javascript.It makes calls to app methods just fine.But what's the right way to get data from Javascript back to the application? It's simple to have javascript call app methods, but any parameters specified in the call on the javascript side don't survive the trip (I just get null in the app).Gross hacks seem obvious (open a url and encode the data in the url), but that can't be right.You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscribe@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
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Apr 14, 2010
I'm trying to write a code that can run on Android 1.5 and 2.0.1, but I have issues with the javascript engine used on Android 1.5. alert(localStorage); just hang on v1.5 while on v2.0.1 it alerts correctly. is there an unblocking way to do it or to detect the version of Android with javascript?
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Apr 8, 2009
My application uses WebView to load javascript which calls into Java class (through webview javascript iterface). Can the JavaScript catch exceptions thrown from Java?
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Apr 22, 2010
I'd like a Javascript library that will stretch/scale 9-patch images correctly. Know of one?
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Sep 30, 2010
I have a webview in my program. I loaded a string into this webview that contains javascript function. When i loaded it in the emulator it's not working i.e if I write a simple alert the webView won't display the alert. I have enabled the javascript. But then also its not working.
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