How to check if file exist ?

sasuke · by **sasuke** » Sun Jan 27, 2008 6:41 am

Hello all,

What's the easiest way to check if a file exist or not ? I use the :

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Using java Syntax Highlighting

 
File f = new File("f.txt");
 
if (f.exist()) {
 
...
 
}
 
Parsed in 0.029 seconds,  using GeSHi 1.0.8.4

it's not working...

Regards,
sasuke

tum0rc0re · by **tum0rc0re** » Sun Jan 27, 2008 6:53 am

sasuke wrote:Hello all,

What's the easiest way to check if a file exist or not ? I use the :

Syntax: [ Download ] [ Hide ]
Syntax: [ Download ] [ Show ]
Using java Syntax Highlighting

File f = new File("f.txt");

if (f.exist()) {

...

}

Parsed in 0.030 seconds, using GeSHi 1.0.8.4

it's not working...

Regards,
sasuke

It's right, simply you have to specify the file name as "fullpathfilename"

Syntax: [ Download ] [ Hide ]

Using java Syntax Highlighting

boolean exists = (new File("fullpathfilename")).exists();
if (exists) {
  // File or directory exists
} else {
  // File or directory does not exist
}
Parsed in 0.033 seconds,  using GeSHi 1.0.8.4

sasuke · by **sasuke** » Sun Jan 27, 2008 7:16 am

@tum0rc0re hmm.. doesn't work either...

android won't create the file if already exist, but how to check it?

Regards,
sasuke

plusminus · by **plusminus** » Sun Jan 27, 2008 12:26 pm

Hello sasuke,

what about doing an openFileInput(path); and if the file doesn't exist you can catch the FileNotFound-Exception :?:

(untested

+ didn't have a look at the sdk-documentation

)

Regards,
plusminus

sasuke · by **sasuke** » Sun Jan 27, 2008 1:21 pm

@plusminus, i'm sure that can be done..

i must check the file manually :lol:

Regards,
sasuke

cabernet1976 · by **cabernet1976** » Mon Jan 28, 2008 4:26 am

I have no experience about File.exist() for file system, but I am sure it can work fine for file in sdcard.
plusminus's way is smart.

cabernet1976 · by **cabernet1976** » Mon Jan 28, 2008 4:30 am

I just think we'd better to create a class which can work for the file both in file system and sdcard.
How do you think about it?

sasuke · by **sasuke** » Mon Jan 28, 2008 4:40 am

Hello cabernet1976,

It's a problem if we can't create a file with a specific path, and we can't retreive the file list within our app's path (data/data/<package>/) because the different between the security level..

cabernet1976 wrote:I just think we'd better to create a class which can work for the file both in file system and sdcard.
How do you think about it?

I've created a file that listed all the files that i created with my apps, so when i want to check the file list, delete a file, append, etc.. i just retrieved the file name from the index, and process it..

Regards,
sasuke

How to check if file exist ?

How to check if file exist ?

Re: How to check if file exist ?

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