Java - How to create a file on phone using JvDroid?

Question

In Java tutorial, we are taught to work with files on computer. How to work with files on our phone?🤔

I already used JvDroid

I have a file named kira.txt in my internal storage.

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

System.out.print( f.exists() );

Why the output is false?

Answer 1

that's an example of my internal storage ;)

in fact internal storage is usually named 'sdcard' (think of it as an unmovable sdcard)

android use linux/unix file system... external sd are mounted to miscelanous directory names under /sdcard/ (could differ related to phone manufacterer...) and could be mounted at different places at same time (different valid path to access same sd/directories)

the simpler and safest to get the path of your file would be to use a file explorator wich could give it to you (almost all decents: I currently use an old version of ES File Explorer, and Total Commander on an old phone)...

on my old phone the paths look like:

/storage/sdCard0/download/file.txt

for internal storage

and

/storage/extSdCard/folder/fike.txt

for external storage

Answer 2

visph I use JvDroid on my phone

Answer 3

I don't know: maybe it's either a problem of you're not executing the code in the directory containing the file (working directory: may be different of those where the script/executable reside), or a problem related to file permissions: android tends to be very strict about that ;P

Answer 4

something like:

/sdcard/Download/file.txt

absolute path must start with a slash (root is /)

without the starting slash, the path will be relative to the current working directory (folder)

Answer 5

visph Martin Taylor It worked!!👍👍. I successfully created a txt file in my internal storage

Answer 6

if you run your code in sololearn playground, then it is executed on sololearn servers, so you try to access their local file system, not your phone file system ^^

Answer 7

visph How to specify path of a file in an Android phone?🤔

Answer 8

visph 😅 If the file is in the internal storage?🤔

Answer 9

Use Java n-ide not available on playstore