Thanks Marks,Bob.
Your help is really appreciated,
I will follow java i/o.
On Apr 22, 9:39 pm, Bob Kerns wrote:
> Mark points out all the reasons you shouldn't even be trying to do
> this.
>
> But there's more! I assume you're going to take Mark's advice anyway,
> but these are things that are likely to cause you trouble someday in
> the future, so I'll point them out anyway.
>
> First, you are trying to cd to some directory you have no reason to
> believe exists. You don't have any idea what your current directory is
> -- why should you expect it to have a 'sdcard' subdirectory? I expect
> you meant "/sdcard" -- and that might work on your device. It might
> not work on some other device, though. See this class for methods to
> handle this cleanly:
>
> http://developer.android.com/intl/de/reference/android/os/Environment...
> (You'll want to make use of this with Mark's advice, too).
>
> And even if you did manage to cd to a directory named 'sdcard' -- it
> would have NO EFFECT WHATSOEVER on the next command you execute!
>
> You ran a shell and told it to do 'cd sdcard'. When it's done with
> that, it exits. You no longer have a shell with that working
> directory. Now you try to run 'ls' in a new shell. This new shell
> doesn't care what you did in the old shell. It is NOT going to be
> executing in your sdcard directory.
>
> You could put these two commands into a .sh file, and execute that.
> But what's the point? You could supply the same path directly to 'ls'.
> Or even better, use the Java facilities for accessing the filesystem
> and avoid all kinds of bugs you'd probably introduce -- like, for
> example, handling spaces in filenames, etc.
>
> On Apr 22, 5:50 am, Karteek N wrote:
>
>
>
>
>
> > Hi ,
> > I want to display what are the files and contents in sdcard through
> > application.
> > I am able to print the root folder.But when i execute cd sdcard
> > it throws me exception that permission is denied.
> > When i did the same thing using adb shell i am able to display the sdcard.
> > Is there any way to change permissions like sudo
>
> > I used the following code to display root folder
>
> > Runtime rt = Runtime.getRuntime();
> > try {
> > Process process;
> > process=rt.exec("ls");
> > try{
> > BufferedReader in =new BufferedReader(new
> > InputStreamReader(process.getInputStream()));
>
> > String line;
> > while ((line = in.readLine()) != null) {
> > Log.d("debug",line);
> > }
> > in.close();
>
> > } catch (Exception e) {
> > e.printStackTrace();
> > System.out.println(e.getMessage());
> > }
>
> > } catch (IOException e) {
>
> > e.printStackTrace();
> > }
>
> > But when change the above code like
> > process=rt.exec("cd sdcard");
> > process=rt.exec("ls");
> > Its throws exception
>
> > Any help please
> > Regards,
> > Karteek
>
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