Android Question How to write to USB flash drive?

[vecino]

Hello, my tablet has a USB port that I connect a USB flash drive to read files.
However, I can not write to the flash drive. Displays error messages motivated to write permissions.
How I can change the permission to write?

/mnt/USB

Thanks and regards

 

[stevel05]

Have you already got the permission "android.permission.WRITE_EXTERNAL_STORAGE" in your manifest?

EDIT: after a quick look on Google, it doesn't appear to be that simple. Perhaps someone has already done it that can post.

 

[vecino]

Thanks, then I can not write to USB, I can only read.
How strange!, Is it normal?

Thanks and regards.

 

[stevel05]

To be honest, I've not tried it, but there are lots of posts on the internet about the issue.

 

[vecino]

Thanks

 

[DonManfred]

Thanks, then I can not write to USB, I can only read.
How strange!, Is it normal?

Yes, it is. Google has changed permissions in Android 4.4+ (KitKat). A app can only write to /android/data/ownpackagename/ in KitKat.

 

[vecino]

Hello,

Yes, it is. Google has changed permissions in Android 4.4+ (KitKat). A app can only write to /android/data/ownpackagename/ in KitKat.

Hi, in my case is an android 4.0.3 (kernel 2.6.37)
Thanks

 

[DonManfred]

Then it should work if you have the needed permissions.

Have you checked steve05´s question?

>Have you already got the permission "android.permission.WRITE_EXTERNAL_STORAGE" in your manifest?

 

[vecino]

Then it should work if you have the needed permissions.
Have you checked steve05´s question?
>Have you already got the permission "android.permission.WRITE_EXTERNAL_STORAGE" in your manifest?

Hi, yes I have put it, but does not allow me to write, only read.
Regards

 

[vecino]

I typed this:

android.permission.WRITE_EXTERNAL_STORAGE

Is it right or I have to put something else?

Regards.

 

[DonManfred]

You have to add the line

AddPermission (android.permission.WRITE_EXTERNAL_STORAGE)

in the manifesteditor of B4A i think.

 

[DonManfred]

But you also can check on your device whether your app has this permission. Go to the devices AppManager, click on the app... Do not uninstall it , just scroll to the bottom... There should be a list of permissions used by this app

 

[vecino]

Wow, does not work either.
I think it may be a limitation imposed by the manufacturer.
Thanks for the help.
Regards.

 

[vecino]

But you also can check on your device whether your app has this permission. Go to the devices AppManager, click on the app... Do not uninstall it , just scroll to the bottom... There should be a list of permissions used by this app

He says:

Storage:
Modify / delete SD card contents

The SD card is not problem.
The problem is to use a USB flash drive into a USB port

Regards.

 

[Kartographers]

Any update on this issue?? Even after granting permissions in manifest.xml, I am unable to copy a file on USB. My android version is 4.2.2 and its a CubieTruck

 

[Kartographers]

Fixed the problem by following steps mentioned here
http://forum.xda-developers.com/showthread.php?t=2617921

 

[DonManfred]

But this only works on a rooted device. I dont have an rooted device cause i do not want to loose warranty.