File IO tutorial?

[rfresh]

I need to save some data to a file and then read it back into a variable. Is there a tutorial showing me some examples of doing file io?

I understand that I should not try to write to an sd card since not all devices will have one. I assume it's recommended that I create a folder for my app to write the data to? My have a very small amount of data to store.

Thanks...

 

[wl]

Have a look at: Basic4android - RandomAccessFile

 

[Erel]

Also see this tutorial: Text files

 

[rfresh]

What is the generally accepted standard for where we should write our data? Should I make a folder off of the root for my app? Or is there another, recommend location?

 

[stevel05]

While not all devices will support and SDCard, they will need some form of additional memory to install apps on, I have seen refferred to as NAND on some devices. This is still external memory as far as Android is concerned and can be accesses via File.DirRootExternal or File.DirDefaultExternal (app installation folder) which is treated the same as the SDCard on devices that don't have NAND.

It should also pass the File.ExternalWritable test see here

 

[rfresh]

So, I want to be writing my file data to External storage? (NAND or SDCARD)

On my Droid3 I see the following folders off of the root:

sdcard
sdcard-ext
sys
system
tmp

That's it.

 

[rfresh]

Is there a Lib I need to declare to use RandomAccessFile?

 

[Erel]

Yes. The RandomAccessFile library.

 

[stevel05]

Yes use File.DirDefaultExternal or File.DirRootExternal and a path if you want it somewhere different.