[android-developers] Re: FileObserver

[Shyam Kumar]

Hi Developers,
 
This is about FileObserver Bug. I am using FileObserver in my application 
to keep track of newly created, deleted and modified files (images, video, 
MS Word document and PDF files). I am successful in handling these events 
in Lollipop but partially successful in Marshmallow.
 
Detailed issue in Marshmallow.

   1. I have tested this in Nexus 6 Marshmallow and it works fine.
   2. But, when it comes to* LG Marshmallow and Samsung s7 (Marshmallow) *I 
   am not able to capture the files.
   3. When I tested in these mobiles, below events are not triggered, the 
   events number are refereed from the this link. 
   https://developer.android.com/reference/android/os/FileObserver.html


   - *Create - 256 *
   - *Delete - 512*
   - *Modified - 2 *

These event numbers are *not triggered.* Is this a bug in Marshmallow 
itself ? Why its not working in Samsung s7 and LG marshmallow devices? Is 
Samsung and LG devices with Marshmallow restricting us from capturing using 
file observer?
 
Please share your suggestions and help me to resolve these issues
 
Thank You
Shyamkumar M

On Thursday, May 3, 2012 at 7:20:50 PM UTC+5:30, Meryeme wrote:
>
> hey everyone!!
>
> I have been reading the doc about fileObserver but I did not have 
> enough information about that. so I am wondering how can we use 
> FileObserver, can we use for any file I mean even .xml or .db files? do you 
> konw any tutorial about that?
>
> -- 
> Meryeme Ayache.
>
> *Third year Computer Science Student Engineer at  **Ecole Nationale 
> Supérieure d'Informatique et d'Analyse des Systèmes (Rabat)*
>
> *Information Security System Major.*
>
>
>
>

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[android-developers] Re: fileobserver

[Shyam Kumar]

Hi Developers,
 
This is about FileObserver Bug. I am using FileObserver in my application 
to keep track of newly created, deleted and modified files (images, video, 
MS Word document and PDF files). I am successful in handling these events 
in Lollipop but partially successful in Marshmallow.
 
Detailed issue in Marshmallow.

   1. I have tested this in Nexus 6 Marshmallow and it works fine.
   2. But, when it comes to* LG Marshmallow and Samsung s7 (Marshmallow) *I 
   am not able to capture the files.
   3. When I tested in these mobiles, below events are not triggered, the 
   events number are refereed from the this link. 
   https://developer.android.com/reference/android/os/FileObserver.html


   - *Create - 256 *
   - *Delete - 512*
   - *Modified - 2 *

These event numbers are *not triggered.* Is this a bug in Marshmallow 
itself ? Why its not working in Samsung s7 and LG marshmallow devices? Is 
Samsung and LG devices with Marshmallow restricting us from capturing using 
file observer?
 
Please share your suggestions and help me to resolve these issues
 
Thank You
Shyamkumar M

On Thursday, February 5, 2009 at 4:43:25 PM UTC+5:30, and.pradeep wrote:
>
> thanks solved it. instead of creating in separate threads i did it in 
> single thread by creating an instance of fileobserver for each 
> directory and calling startwatching(); in a loop. 
>
> On Feb 4, 11:03 pm, Dianne Hackborn  wrote: 
> > You don't need to create any threads to use FileObserver -- it is 
> > callback-based. 
> > 
> > On Tue, Feb 3, 2009 at 11:27 PM, pradeep  wrote: 
> > 
> > > i need to observe a sdcard i.e all the folders inside. i am creating 
> > > fileobservers for each folder in saparate threads, but i don't think 
> > > it is efficient. is there any other method for do so? 
> > 
> > -- 
> > Dianne Hackborn 
> > Android framework engineer 
> > hack...@android.com 
> > 
> > Note: please don't send private questions to me, as I don't have time to 
> > provide private support.  All such questions should be posted on public 
> > forums, where I and others can see and answer them. 
>

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[android-developers] Re: FileObserver not returning file changes within subfolders?

[Alik Elzin]

See an open bug:
http://code.google.com/p/android/issues/detail?id=12479

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[android-developers] Re: FileObserver not returning file changes within subfolders?

[FrankG]

Hi Freddy,

strange .. I thought the FileObserver uses Linux native call
inotify ,
which is able to send events for directories too,

What definitly will not work is FileObserver for sysfs entries.

Good luck ! Frank



On 12 Okt., 00:41, Freddy f...@charter.net wrote:
 ok.  I found more info.  Apparently the docs are incorrect.
 FileObserver does not support recursive file watching.

 On Oct 11, 1:50 pm, Freddy f...@charter.net wrote:



  The FileObserver class doesn't appear to be working as advertised.

  I created a class extending the FileObserver class.  I initialize the
  class to watch the path of the sdcard as returned from the Android
  Environment.getExternalStorageDirectory function.  Everything seems to
  work perfectly as long as the files are in the ROOTof the sdcard.  Any
  files within SUB-FOLDERS of the sdcard are NOT returned to my public
  void onEvent(int event, String path) callback in my FileObserver
  class.

  Has anyone seen this issue?  The docs say files in subfolders should
  be returned to the onEvent() callback but it's not happening.  Note,
  I've only tested on the Android simulator (v2.2) since I do not yet
  have access to a device.  Maybe this is a bug specific to the
  simulator?

  Thanks!- Zitierten Text ausblenden -

 - Zitierten Text anzeigen -

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[android-developers] Re: FileObserver not returning file changes within subfolders?

[Freddy]

Indeed I was suprised too.  I found this post from an android.com
offical stating the docs are wrong and sub-folders are NOT watched.
Which does match what I'm seeing in my app.  Too bad really ... that
would be an excellent feature!
http://groups.google.com/group/android-platform/browse_thread/thread/fb24c672bb79d7c2

On Oct 12, 12:13 am, FrankG frankgru...@googlemail.com wrote:
 Hi Freddy,

 strange .. I thought the FileObserver uses Linux native call
 inotify ,
 which is able to send events for directories too,

 What definitly will not work is FileObserver for sysfs entries.

 Good luck ! Frank

 On 12 Okt., 00:41, Freddy f...@charter.net wrote:



  ok.  I found more info.  Apparently the docs are incorrect.
  FileObserver does not support recursive file watching.

  On Oct 11, 1:50 pm, Freddy f...@charter.net wrote:

   The FileObserver class doesn't appear to be working as advertised.

   I created a class extending the FileObserver class.  I initialize the
   class to watch the path of the sdcard as returned from the Android
   Environment.getExternalStorageDirectory function.  Everything seems to
   work perfectly as long as the files are in the ROOTof the sdcard.  Any
   files within SUB-FOLDERS of the sdcard are NOT returned to my public
   void onEvent(int event, String path) callback in my FileObserver
   class.

   Has anyone seen this issue?  The docs say files in subfolders should
   be returned to the onEvent() callback but it's not happening.  Note,
   I've only tested on the Android simulator (v2.2) since I do not yet
   have access to a device.  Maybe this is a bug specific to the
   simulator?

   Thanks!- Zitierten Text ausblenden -

  - Zitierten Text anzeigen -- Hide quoted text -

 - Show quoted text -

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[android-developers] Re: FileObserver not returning file changes within subfolders?

[Freddy]

ok.  I found more info.  Apparently the docs are incorrect.
FileObserver does not support recursive file watching.

On Oct 11, 1:50 pm, Freddy f...@charter.net wrote:
 The FileObserver class doesn't appear to be working as advertised.

 I created a class extending the FileObserver class.  I initialize the
 class to watch the path of the sdcard as returned from the Android
 Environment.getExternalStorageDirectory function.  Everything seems to
 work perfectly as long as the files are in the ROOTof the sdcard.  Any
 files within SUB-FOLDERS of the sdcard are NOT returned to my public
 void onEvent(int event, String path) callback in my FileObserver
 class.

 Has anyone seen this issue?  The docs say files in subfolders should
 be returned to the onEvent() callback but it's not happening.  Note,
 I've only tested on the Android simulator (v2.2) since I do not yet
 have access to a device.  Maybe this is a bug specific to the
 simulator?

 Thanks!

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[android-developers] Re: FileObserver

[perumal316]

Hi,

Thanks for the help. Yes, my class name was also FileObserver. Now
managed to resolve it.

Regards,
Perumal

On Jul 12, 6:49 pm, Mark Murphy mmur...@commonsware.com wrote:
 On Mon, Jul 12, 2010 at 2:31 AM, perumal316 perumal...@gmail.com wrote:
  I want to observe the changes made to the filesystem. I am reposting
  as previously I have used a wrong title to post.

  I am using FileObserver for this purpose. But I am getting this error
  when i
  import android.os.FileObserver:

  The import conflicts with a type defined in the same file

  Any idea how to resolve this?

 It sounds like you have a class in this file named FileObserver, or
 another import that is importing a class named FileObserver.

 --
 Mark Murphy (a Commons 
 Guy)http://commonsware.com|http://github.com/commonsguyhttp://commonsware.com/blog|http://twitter.com/commonsguy

 Android App Developer Books:http://commonsware.com/books

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[android-developers] Re: fileobserver

[and.pradeep]

what if I have to observe 2 or more folders (or paths)? even then
threads are not required?

how to register callbacks?

On Feb 4, 11:03 pm, Dianne Hackborn hack...@android.com wrote:
 You don't need to create any threads to use FileObserver -- it is
 callback-based.

 On Tue, Feb 3, 2009 at 11:27 PM, pradeep pradeep...@gmail.com wrote:

  i need to observe a sdcard i.e all the folders inside. i am creating
  fileobservers for each folder in saparate threads, but i don't think
  it is efficient. is there any other method for do so?

 --
 Dianne Hackborn
 Android framework engineer
 hack...@android.com

 Note: please don't send private questions to me, as I don't have time to
 provide private support.  All such questions should be posted on public
 forums, where I and others can see and answer them.

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[android-developers] Re: fileobserver

[and.pradeep]

thanks solved it. instead of creating in separate threads i did it in
single thread by creating an instance of fileobserver for each
directory and calling startwatching(); in a loop.

On Feb 4, 11:03 pm, Dianne Hackborn hack...@android.com wrote:
 You don't need to create any threads to use FileObserver -- it is
 callback-based.

 On Tue, Feb 3, 2009 at 11:27 PM, pradeep pradeep...@gmail.com wrote:

  i need to observe a sdcard i.e all the folders inside. i am creating
  fileobservers for each folder in saparate threads, but i don't think
  it is efficient. is there any other method for do so?

 --
 Dianne Hackborn
 Android framework engineer
 hack...@android.com

 Note: please don't send private questions to me, as I don't have time to
 provide private support.  All such questions should be posted on public
 forums, where I and others can see and answer them.

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[android-developers] Re: fileobserver

[Dianne Hackborn]

You don't need to create any threads to use FileObserver -- it is
callback-based.

On Tue, Feb 3, 2009 at 11:27 PM, pradeep pradeep...@gmail.com wrote:


 i need to observe a sdcard i.e all the folders inside. i am creating
 fileobservers for each folder in saparate threads, but i don't think
 it is efficient. is there any other method for do so?

 



-- 
Dianne Hackborn
Android framework engineer
hack...@android.com

Note: please don't send private questions to me, as I don't have time to
provide private support.  All such questions should be posted on public
forums, where I and others can see and answer them.

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