Android Question Iterating though views and accessing their properties

[MitchBu]

Here is what I tried to do :

For Each v As View In Activity.GetAllViewsRecursive
        If v Is EditText And Diko.ContainsKey(v.tag) Then
                v.TextColor = 0xFF6361FF
        End If
    Next

Of course it does not work since v is a view and not an EditText. But, would it be possible somehow to cast v to EditText so I can access the view's properties ?

 

[agraham]

Try

For Each v As View In Activity.GetAllViewsRecursive
        If v Is EditText And Diko.ContainsKey(v.tag) Then
                Dim vedt as EditText = v
                vedt.TextColor = 0xFF6361FF
        End If
    Next

 

[MitchBu]

As often, asking a question leads to the answer.

I finally did this :

For Each E As EditText In Activity.GetAllViewsRecursive
        If e Is EditText Then e.TextColor = 0xFF6361FF
    Next

I test e against EditText, because Labels get fetched, and trying to set the TextColor property triggered an error.

 

[agraham]

That's very interesting. I would have expected it to throw an error if there were any views other than EditTexts in the activity as the generated Java loop code casts each view in turn to an EditText. I wonder why that cast doesn't error for your Labels

_e = new anywheresoftware.b4a.objects.EditTextWrapper();
...
for (; index1 < groupLen1;index1++){
_e.setObject((android.widget.EditText)(group1.Get(index1)));

 

[MitchBu]

Try

For Each v As View In Activity.GetAllViewsRecursive
        If v Is EditText And Diko.ContainsKey(v.tag) Then
                Dim vedt as EditText = v
                vedt.TextColor = 0xFF6361FF
        End If
    Next

This is a better solution than what I was doing. Thank you agraham

 

[MitchBu]

That's very interesting. I would have expected it to throw an error if there were any views other than EditTexts in the activity as the generated Java loop code casts each view in turn to an EditText. I wonder why that cast doesn't error for your Labels

_e = new anywheresoftware.b4a.objects.EditTextWrapper();
...
for (; index1 < groupLen1;index1++){
_e.setObject((android.widget.EditText)(group1.Get(index1)));

You were right, agraham. It did eventually trigger an error, which seems to be random.

 

[Erel]

I like to use B4XView (XUI library) for such cases:

For Each E As B4XView In Activity.GetAllViewsRecursive
        If e Is EditText Then e.TextColor = 0xFF6361FF
Next

This code is valid.

 

[MitchBu]

What is the advantage of using B4XView as opposed to View ?

 

[agraham]

This code is valid.

I had to dig into the Java in XUI.jar to see why!