In which cases SecurityException thrown on file operations on android?

Question

I work with File.java class. Most of its methods can throw SecurityException. But I don't find any information about cases in which it throws.

I look in android sources and find following: different File methods perform such call

 SecurityManager security = System.getSecurityManager();
    if (security != null) {
        security.e(path);
    }

Or checkWrite() / checkDelete() In all this cases SecurityManager creates FilePermission object and validates it in Context.checkPermission()

public void checkRead(String file, Object context) {
    checkPermission(new FilePermission(file, "read"), context);
}

Actually from this code I don't figure out when for current Context some file operation will deny and SecurityException will thrown (except trivial situation with not declared in manifest permissions). I guess it also thrown when app try to get access to protected directories, like "root" or "date". But when else?

score 1 · Answer 1 · answered Jan 17 '13 at 14:41

1

SecurityExceptions are for when you try to do something that your app does not have permission to do. i.e. writing to the SD card without WRITE_EXTERNAL permission listed in your manifest.

As far as I know the lack of permission in manifest is the only way to cause a SecurityException to be raised. However it might be worth noting that anytime you are dealing with file i/o there is also the posssibility of other Exceptions, like IOException.

answered Jan 17 '13 at 14:41

FoamyGuy

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IOException - is old and good-known enemy )) ... in contrast to SecurityException. – Oleksii Kolotylenko Jan 17 '13 at 14:47
SecurityException is thrown only when your app lacks permission in manifest I believe. – FoamyGuy Jan 17 '13 at 15:05

In which cases SecurityException thrown on file operations on android?

1 Answers1