Android Question [Things] How to mount USB drive in app?

T

Tem

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I need to write some data to text file on USB external drive.
Mounting USB stick in Android Things using ADB works fine:
In ADB shell:

B4X: 
su
mkdir /mnt/usb
mount -t vfat -o rw /dev/block/sda1 /mnt/usb

All works only using superuser.

Any idea, how to mount USB stick in own app? No permissins to do this
Android Things is not rooted
 
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T

Tem

Member
Licensed User
Longtime User
Hi Erel

Here is my code:

B4X: 
Sub Button_prepare_Click
    Dim StdOut, StdErr As StringBuilder
    Dim Ph As Phone
    StdOut.Initialize
    StdErr.Initialize
   
    Ph.Shell("su", Null, StdOut, StdErr)
    Ph.Shell("mkdir /mnt/usb", Null, StdOut, StdErr)
    'Ph.Shell("mount ", "-t vfat -o rw" & "/" & "dev" & "/" & "block" & "/" & sda1 , StdOut, StdErr)
   
    Msgbox(StdErr.tostring, "Mount USB Stick")
End Sub

Running this, error appears:

Error occured
An error has occurred in sub:main_button_prepare_click (java line:671)
java.io.IOExcepton: Cannot run program "su":error=13, Permission denied

When only "mkdir /mnt/usb" command is executed, the error appears on Msgbox:

Mount USB Stick
mkdir: '/mnt/usb': Permission denied
 
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