Like u recommended, i posted my query at android porting ,however,
So far i didnt get to hear from anyone,,so ,, i m still struggling
alone.....
Now i am trying to open the virtual file at bootup and reload it with
the byte stream..... However I am only able to open the virtual file
for reading and not for writing.... I think i need to change the
permissions..... How do i do that ?? Can anyone help??????
**************************************************************
The reading code is as follows: // NO BREAKAGE
byte[] buffer1 = new byte[100];
BufferedReader reader = null;
try{
reader = new BufferedReader(new FileReader
("/sys/class/lightsensor/
switch_cmd/lightsensor_file_cmd"));
Log.d(TAG,"Opened the SAVED virtual file");
}catch(IOException e){
Log.d(TAG,"Problem opening the SAVED virtual file");
}
try{
Log.d(TAG, "Buffer read from virtual file
="+reader.readLine());
Log.d(TAG,"Read the SAVED virtual file");
reader.close();
}catch(IOException e){
Log.d(TAG,"Problem reading the SAVED virtual file");
}
*************************************************
for writing i use the following code: // BREAKAGE WHILE OPENING THE
FILE???????
byte[] buffer = new byte[100];
buffer[0] = '1';
OutputStream out = null;
try{
Log.d(TAG, "OPENING the virtual file");
out = new FileOutputStream(new File("/sys/class/
lightsensor/switch_cmd/lightsensor_file_cmd"));
}catch (FileNotFoundException e) {
Log.d(TAG,"Problem in Opening the virtual file for
writing"); //
THIS LOG IS DISPLAYED
}
try {
Log.d(TAG, "WRITING -> Virtual file");
out.write(buffer);
} catch (IOException e){
e.printStackTrace();
Log.d(TAG,"Problem in Writing in the Virtual file");
}
*****************************************************************************
Dianne Hackborn wrote:
> Hi, this is way outside of the SDK; applications should not be touching such
> things. Please move to android-porting.
>
> On Fri, Jun 26, 2009 at 6:47 PM, Shang Hao <[email protected]> wrote:
>
> >
> > In my case, I mark auto brightness option in one of my apk..... This
> > would send some byte stream to "/sys/class/lightsensor/switch_cmd/
> > lightsensor_file_cmd"..... And auto brightness will be activated once
> > this byte stream is delivered....
> >
> > However, the auto brightness capability should be ON even if I
> > reboot..... BUt since data in the file is getting deleted, auto
> > brightness feature is failing...... How can i overcome this????
> >
> > Xie xie.
> >
> > Diego Torres Milano wrote:
> > > /sys is a virtual filesystem, it doesn't persist reboots.
> > >
> > > On Jun 26, 12:18 pm, Shang Hao <[email protected]> wrote:
> > > > Hi,
> > > >
> > > > I am storing a byte stream @
> > > >
> > > > "/sys/class/lightsensor/switch_cmd/lightsensor_file_cmd"
> > > >
> > > > but on reboot, the value over here is getting lost..... How do i
> > > > recover????
> > > >
> > > > Xie xie.
> > >
> >
>
>
> --
> Dianne Hackborn
> Android framework engineer
> [email protected]
>
> Note: please don't send private questions to me, as I don't have time to
> provide private support, and so won't reply to such e-mails. All such
> questions should be posted on public forums, where I and others can see and
> answer them.
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