Writing and Reading to/from text files

[Kamac]

Hi.


Could someone give me straight-forward two examples of writing and reading to/from text files?

1. Write "a" to text file called "text.txt"
2. Read all strings from "text.txt" and store them into array.

@additional 3. After doing 1, how to add another "a" to "text.txt" so it'll contain "a
a"

- basically, extending "text.txt" in more strings.

 

[Erel]

Did you see the text files tutorial?

Basic4android Search: Text files tutorial

 

[Kamac]

Yes i did, but File.DirRootExternal isn't saving anywhere, or is it just me?

 

[Erel]

File.DirRootExternal is the storage card folder.

 

[Kamac]

Is there a way to save some .txt file into Files folder, since i am actually on emulator?

 

[klaus]

You can use Files.DirInternal.
You cannot write a file to the applications file folder you see in the IDE.
If you setup the Emulator with an SD card, File.DirRootExternal works also with the Emulator.

Best regards.

 

[Kamac]

If you setup the Emulator with an SD card, File.DirRootExternal works also with the Emulator.

Ow. But how to do that?

 

[klaus]

- Run the AVD Manager
- Setup the Emulator
- In the Hardware part, click on 'New' (picture 1)
- You will see SD Card support, click on 'OK' (picture 2)
- That's it (picture 3).

Best regards.

 

[Kamac]

"Error, failed to create SDCard"

:sign0161:


@Edit

Nvm. Got it.

 

[Kamac]

Sorry for double post, but no one would read it otherway.

I don't know where's that file saving, when i write to File.DirRootExternal and have sd card enabled :sign0137:

 

[Erel]

The emulator cannot access the desktop file system. The file is stored internally.

 

[Kamac]

The file is stored internally.

Which means i cannot access it?

 

[Erel]

Not directly. You can use a tool such as 'adb' tool to get the file.

 

[Kamac]

Ok, i'll take a look on it. Why may this not work?

   Dim random As Int
   random = Rnd(1,2)
   RemoveViews
   Activity.LoadLayout("newmonster")
   If(mResult == "Dot") Then
      Monster.Bitmap = LoadBitmap(File.DirAssets,"egg.gif")
      MonsterType.Text = "1st SPECIAL Monster"
   Else If(random == 1) Then
      Monster.Bitmap = LoadBitmap(File.DirAssets,"bird.gif")
      MonsterType.Text = "Some Bird"
   Else If(random == 2) Then
      Monster.Bitmap = LoadBitmap(File.DirAssets,"creature.gif")
      MonsterType.Text = "You've got an CREATURE"      
   End If

it's always giving me out

   Else If(random == 1) Then
      Monster.Bitmap = LoadBitmap(File.DirAssets,"bird.gif")
      MonsterType.Text = "Some Bird"

but

   If(mResult == "Dot") Then
      Monster.Bitmap = LoadBitmap(File.DirAssets,"egg.gif")
      MonsterType.Text = "1st SPECIAL Monster"

is special and it works for certain things.

What i mean is that variable random is always equal to 1.

 

[Erel]

See the description of Basic4android Search: Rnd

 

[Kamac]

Hmmm. It didn't really help.

 

[Erel]

It is better to start a new thread for each question.

Rnd returns a value between the min parameter (inclusive) and max parameter (exclusive). This means that the maximum possible value is max-1.

 

[Kamac]

Okay i got it.




My last problem, but related to that topic. I will make it short:

Can i make an .txt to my app which i can store strings into it, but i can also view it to see the result?



Example.

Make an text file, store "a" to it.


Now i can see that text file, next to my .apk or in Files folder.

 

[Erel]

Using the Files tab (at the right pane) you can add any file you want to your project. However you cannot write to this folder as it is a virtual folder.

 

[Kamac]

So is there a way for me to view text files created and modified by my application during emulator mode?

Edit@

It is extremely hard, when you don't even know if it works.