Android File Dialog Tutorial using Basic4Android

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This is my continuation in our Dialog example and next to be discussed is the File Dialog.

First, we have to create our Layout name and named it as "Main" and have one button named Button1. You need to initialized the following variables in the Sub Globals below:

1. Sub
   
   Globals
   
2. 'These global variables will be redeclared each time the activity is created.
   
3. 'These variables can only be accessed from this module.
   
4. 
   
5. Dim
   
   Button1 As
   
   Button
   
6. Dim
   
   bmp As
   
   Bitmap
   
7. End
   
   Sub
   

Take note that bmp here is used as our variable to create an icon for our file dialog.

Here is our complete code for this tutorial:

1. Sub
   
   Process_Globals
   
2. 'These global variables will be declared once when the application starts.
   
3. 'These variables can be accessed from all modules.
   
4. 
   
5. End
   
   Sub
   
6. Sub
   
   Activity_Create(FirstTime As
   
   Boolean
   
   )
   
7. 'Do not forget to load the layout file created with the visual designer. For example:
   
8. 'Activity.LoadLayout("Layout1")
   
9. Activity.LoadLayout("Main"
   
   )
   
10. bmp.InitializeSample(File.DirAssets, "bermoy.jpg"
    
    ,48,48)
    
11. Activity.Title = "File Dialog - Lyndon Bermoy"
    
12. 
    
13. End
    
    Sub
    
14. 
    
15. Sub
    
    Activity_Resume
    
16. 
    
17. End
    
    Sub
    
18. 
    
19. Sub
    
    Activity_Pause (UserClosedAs Boolean
    
    )
    
20. 
    
21. End
    
    Sub
    
22. 
    
23. Sub
    
    Button1_Click
    
24. Dim
    
    fd As
    
    FileDialog
    
25. Dim
    
    ret As
    
    Object
    
26. fd.FastScroll = True
    
27. fd.KeyboardPopUp = False
    
28. 'fd.ShowOnlyFolders = True
    
29. fd.FilePath = File.DirRootExternal ' also sets ChosenName to an emtpy string
    
30. 'fd.ShowOnlyFolders = true
    
31. 'fd.FileFilter = ".txt" ' for example or ".jpg,.png" for multiple file types
    
32. ret = fd.Show("B4A File Dialog"
    
    , "Yes"
    
    , "No"
    
    , "Maybe"
    
    , bmp)
    
33. ToastMessageShow(ret & " : Path : "
    
    &fd.FilePath& CRLF & "File : "
    
    &fd.ChosenName, False
    
    )
    
34. End
    
    Sub
    

Note:

fd - used as our variable for FileDialog
ret - used as our variable for Object.
fd.FastScroll - a boolean syntax if you want to have the speed of the scrollbar to make fast.
fd.KeyboardPopUp - syntax for pop-upping the keyboard.
fd.FileFilter - syntax for filtering the type of file to be searched.

For more inquiries and need programmer for your thesis systems in any kind of programming languages, just contact my number below.

Best Regards,

Engr. Lyndon Bermoy
IT Instructor/System Developer/Android Developer/Freelance Programmer
Mobile: 09488225971
Landline: 826-9296
E-mail:[email protected]

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