Thanks Marks,Bob. Your help is really appreciated, I will follow java i/o. On Apr 22, 9:39 pm, Bob Kerns <[email protected]> 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 <[email protected]> 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 > > > -- > > You received this message because you are subscribed to the Google > > Groups "Android Developers" group. > > To post to this group, send email to [email protected] > > To unsubscribe from this group, send email to > > [email protected] > > For more options, visit this group > > athttp://groups.google.com/group/android-developers?hl=en > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group > athttp://groups.google.com/group/android-developers?hl=en
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