Android Example [B4X] SELECT - don't waste tags

LucaMs

Expert
Licensed User
[A simple suggestion, not addressed to "experts"]

I am almost certain that some members, having to identify which view triggered an event, use the tags.

For example:

You have a kind of menu, which is composed of 3 ImageViews:

Dim ivPictures As ImageView
Dim ivTexts As ImageView
Dim ivOther As ImageView

which event name is unique, "MenuItem".

One way (quite common, I've read) is to use the tags of those Imageviews.
You set their tags by Designer:

ivPictures.Tag set to "Pictures"
ivTexts.Tag set to "Texts"
ivOther.Tag set to "Other"

Then, in your code you have:
B4X:
Sub MenuItem_Click
   Dim IV As ImageView = Sender
   Select IV.Tag
      Case "Pictures"
         '...
      Case "Texts"
         '...
      Case "Other"
         '...
    End Select
This way you "waste" the tag property and also, if you will change something, you have to change the source code AND the tags by Designer.

You can much more simply compare the objects, the views:
B4X:
Sub MenuItem_Click
   Select Sender
      Case ivPictures
         '...
      Case ivTexts
         '...
      Case ivOther
         '...
   End Select

The same can be applied to groups of views of any kind, obviously, like buttons, for example.
 
Last edited:

AnandGupta

Well-Known Member
Licensed User
You can much more simply compare the objects, the views:
B4X:
Sub MenuItem_Click
   Select Sender
      Case ivPictures
         '...
      Case ivTexts
         '...
      Case ivOther
         '...
   End Select
Wow ! Thanks for the idea/head up.
This is much simpler, from my point of view (a beginner) and matches with my logic in HMG/Xbase++.

Regards,

Anand
 
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