Does Android care about exit status code passed to

问题:

If I kill an Android app with System.exit(...), does it matter what status code I pass? I couldn't find any documentation on whether Android just ignores it or whether certain ones lead to any error messages for example or have any other meaning.

回答1:

This is the exit code returned by the process when it finishes; Android however does not care, but know that the error code should never be higher then 255.

Here is a list of standard exit codes - some process may use their own codes.

0    Clean Exit
1    General Error Catchall
2    Misuse of shell builtins
126  Command invoked execution error
127  Command not found
128  Invalid exit argument?
130  Termination by Control-C
255  Exit status unknown

回答2:

Android does not care, no. This is a java thing -- you can use them for your own debugging etc etc.

Here's an example of system exit codes: http://www.opensource.apple.com/source/Libc/Libc-320/include/sysexits.h

But pretty much, anything > 0 means that its an abnormal exit. You can set it to whatever you want, but I'd just stick to 0 unless you're interacting with other things.

It just seems to be the accepted convention.