Back to Questions
3.1k
views7
comments
Errors in JS console with sample WebSharper Android app
websharperf#android

Hello,

I recently created and ran the sample Android application created with the default WebSharper Android application template. Most of the time when I start the application, no pages show up inside the application in the emulator. Once or twice I have been able to see the application pages, but I get errors in the log. Details as follows:

I create the project and build the app in Visual Studio, then go into the android directory on the command line, where I set the ANDROID_SDK environment variable. While running the (Android 2.2) emulator, I then run 

1
2

android --clear-cache update project -p "`pwd`"
ant debug install

The installation to the emulator is successful. I then run 

1
2

adb shell
# logcat

to see the console output. When I launch the application, it starts but I get a completely black window inside the main application frame (the application name does show up at the top). If I click on the black part of the window, I get: 

1

W/WindowManager(   60): No window to dispatch pointer action 0

I then added the following two lines of code to the application in the Main function in Main.fs:

1
2
3
4

        | Some ctx ->
+          JavaScript.Log("Starting the mobile app with context:")
+          JavaScript.Log(ctx)
           ctx.Trace(Mobile.Priority.Info, "Website", "Starting the mobile app..")

When I ran the application I could then see the pages and click on the links. However, logcat is showing a considerable number of the following error:

1

E/JavaScriptConsole(  277): undefined:1: ReferenceError: Can't find variable: AndroidWebSharperReceiver

However, the application doesn't always start up properly even with the JavaScript logging lines. It appears that most of the time the launch timeout expires at launch time:

1
2
3
4
5
6

I/ActivityManager(   59): Start proc com.mycompany.droidsite for activity com.mycompany.droidsite/.DroidActivity: pid=250 uid=10036 gids={3003}
D/qemud   (   38): fdhandler_accept_event: accepting on fd 10
D/qemud   (   38): created client 0x17fe8 listening on fd 15
D/qemud   (   38): client_fd_receive: attempting registration for service 'sensors'
D/qemud   (   38): client_fd_receive:    -> received channel id 12
W/ActivityManager(   59): Launch timeout has expired, giving up wake lock!

Whereas the successful launch has:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42

I/ActivityManager(   60): Start proc com.mycompany.droidsite for activity com.mycompany.droidsite/.DroidActivity: pid=277 uid=10036 gids={3003}
D/qemud   (   38): fdhandler_accept_event: accepting on fd 10
D/qemud   (   38): created client 0x17fe8 listening on fd 15
D/qemud   (   38): client_fd_receive: attempting registration for service 'sensors'
D/qemud   (   38): client_fd_receive:    -> received channel id 11
D/qemud   (   38): client_registration: registration succeeded for client 11
D/qemud   (   38): fdhandler_event: disconnect on fd 15
D/qemud   (   38): fdhandler_accept_event: accepting on fd 10
D/qemud   (   38): created client 0x17fe8 listening on fd 15
D/qemud   (   38): client_fd_receive: attempting registration for service 'sensors'
D/qemud   (   38): client_fd_receive:    -> received channel id 12
D/qemud   (   38): client_registration: registration succeeded for client 12
D/qemud   (   38): fdhandler_event: disconnect on fd 15
D/qemud   (   38): fdhandler_accept_event: accepting on fd 10
D/qemud   (   38): created client 0x17fe8 listening on fd 15
D/qemud   (   38): client_fd_receive: attempting registration for service 'sensors'
D/qemud   (   38): client_fd_receive:    -> received channel id 13
D/qemud   (   38): client_registration: registration succeeded for client 13
D/qemud   (   38): fdhandler_event: disconnect on fd 15
D/qemud   (   38): fdhandler_accept_event: accepting on fd 10
D/qemud   (   38): created client 0x17fe8 listening on fd 15
D/qemud   (   38): client_fd_receive: attempting registration for service 'sensors'
D/qemud   (   38): client_fd_receive:    -> received channel id 14
D/qemud   (   38): client_registration: registration succeeded for client 14
D/qemud   (   38): fdhandler_event: disconnect on fd 15
I/ActivityManager(   60): Displayed activity com.mycompany.droidsite/.DroidActivity: 1387 ms (total 1387 ms)
E/JavaScriptConsole(  277): undefined:1: ReferenceError: Can't find variable: AndroidWebSharperReceiver

<snip repeated lines>

E/QemuSensors(   60): data__poll: len=-1, errno=9: Bad file number

<snip repeated lines>

E/JavaScriptConsole(  277): undefined:1: ReferenceError: Can't find variable: AndroidWebSharperReceiver

<snip repeated lines>

I/JavaScriptConsole(  277): file:///android_asset/Scripts/IntelliFactory.WebSharper/IntelliFactory.WebSharper.js:1392: Starting the mobile app with context:
I/JavaScriptConsole(  277): file:///android_asset/Scripts/IntelliFactory.WebSharper/IntelliFactory.WebSharper.js:1392: [object Object]
E/QemuSensors(  277): data__poll: len=-1, errno=9: Bad file number
I/Website (  277): Starting the mobile app..

Any help or suggestions welcome.

.

Hi Paul,

Indeed, I have reproduced your issue against 2.4.85. It seems that the issue was solved in the following release currently only available to support subscribers (2.4.86-support).

Before 2.4.86, we primarily tested on Android 3.2 emulator, and our workflow was slightly different - with Eclipse ADT, though I hope this would not matter. You could perhaps try with a higher version of the emulator, or else wait until the 2.4.86-* fixes become available to the public (they do periodically).

Thanks,

Anton

By on 9/28/2012 10:00 AM ()

Or better yet: get WebSharper support - anyone doing serious WebSharper development should have support coverage.

By on 9/28/2012 5:49 PM ()

I'm not doing serious WebSharper development yet; I'm just evaluating. I have to say that it's rather discouraging--even outside the area of mobile development--in that the APIs are so much larger than what's documented (or at least, than the documentation in the PDF and on the website).

By on 9/28/2012 9:06 PM ()

Do the XMLDoc comments help? We will be putting all WebSharper APIs on ApiStack.net - in fact some of the earlier documentation is there even now (although quite a bit outdated).

By on 9/29/2012 5:21 PM ()

They help, but not nearly enough. Some examples of things that took me too long to figure out were:

1) What exactly does the "-<" operator mean?
2) Why are there HTML combinators in two different modules and which should I use when?
3) Why doesn't my file named Sample.template.xml actually get used as a template? (Tutorials on the web and the documentation on the Websharper site says that giving a file the extension .template.xml will cause the compiler to turn it into a corresponding .fs file of template code. As far as I can tell, this is no longer the case, and no such file is included in the sitelet sample project.)

Another issue that I faced was that the IntelliFactory.WebSharper.Android code is not part of the open-source distribution, so I couldn't access the source if I had questions.

A lot of what I've been learning has been through various tutorials posted on the web, but you never know if they are up to date and describe current behavior.

I do look forward to having the APIs on ApiStack.net. In my searches I had managed to find a link to some of that earlier documentation.

By on 10/2/2012 6:28 PM ()

Hi Paul - I understand, and thanks for the insight. I'll do a writeup to clarify these - in the meantime, could you post these as separate FPish questions so others could more easily find them later? Thanks, Adam.

By on 10/7/2012 4:14 AM ()

Done. Thanks!

By on 10/7/2012 9:33 AM ()

    Topic tags

    IntelliFactory Offices Copyright (c) 2011-2012 IntelliFactory. All rights reserved.
    Home | Products | Consulting | Trainings | Blogs | Jobs | Contact Us | Terms of Use | Privacy Policy | Cookie Policy     		Built with WebSharper