Android Question Touch Events on ScrollView

[khwarizmi]

Hi all

Can I apply touch events on ScrollView ?

thanks

 

[khwarizmi]

I found it!
I can handle it to ScrollView.panel

 

[klaus]

I can handle it to ScrollView.panel

No, you cannot. The Touch event is consumed by the ScrollView!
But, you can add a Touch event to the ScrollView with the Reflection library.
Attached a small test program.
And the code:

Sub Globals
    Private scvTest As ScrollView
End Sub

Sub Activity_Create(FirstTime As Boolean)
    Activity.LoadLayout("Main")
   
    Private ref As Reflector
    ref.Target = scvTest
    ref.SetOnTouchListener("scvTouchRef")
   
    FillScrollView
End Sub

Private Sub FillScrollView
    Private i As Int
    Private Height0, Height1 As Int
   
    Height0 = 40dip
    Height1 = Height0 - 2dip
    For i = 0 To 50
        Private lbl As Label
        lbl.Initialize("Labels")
        scvTest.Panel.AddView(lbl, 0, i * Height0, scvTest.Width, Height1)
        lbl.Color = Colors.Blue
        lbl.TextColor = Colors.Yellow
        lbl.Text = "Test " & i
        lbl.Tag = i
    Next
    scvTest.Panel.Height = i * Height0
End Sub

Private Sub scvTouchRef(Viewtag As Object, Action As Int, X As Float, Y As Float, MotionEvent As Object) As Boolean
    Select Action
        Case Activity.ACTION_DOWN
            Log("DOWN")
        Case Activity.ACTION_MOVE
            Log("MOVE")
        Case Activity.ACTION_UP
            Log("UP")
    End Select
End Sub

Private Sub Labels_Click
    Private lbl As Label
   
    lbl = Sender
    Log(lbl.Text)
End Sub

 

[Erel]

In most cases you will need to use TouchPanelCreator from ViewsEx for this. It is a bit more complicated but give you more control: https://www.b4x.com/android/forum/t...pe-actions-and-pull-to-refresh.98252/#content

 

[khwarizmi]

thanks so much klaus and Erel.

 

[marcoseinco]

No, you cannot. The Touch event is consumed by the ScrollView!
But, you can add a Touch event to the ScrollView with the Reflection library.
Attached a small test program.
And the code:

Sub Globals
    Private scvTest As ScrollView
End Sub

Sub Activity_Create(FirstTime As Boolean)
    Activity.LoadLayout("Main")
  
    Private ref As Reflector
    ref.Target = scvTest
    ref.SetOnTouchListener("scvTouchRef")
  
    FillScrollView
End Sub

Private Sub FillScrollView
    Private i As Int
    Private Height0, Height1 As Int
  
    Height0 = 40dip
    Height1 = Height0 - 2dip
    For i = 0 To 50
        Private lbl As Label
        lbl.Initialize("Labels")
        scvTest.Panel.AddView(lbl, 0, i * Height0, scvTest.Width, Height1)
        lbl.Color = Colors.Blue
        lbl.TextColor = Colors.Yellow
        lbl.Text = "Test " & i
        lbl.Tag = i
    Next
    scvTest.Panel.Height = i * Height0
End Sub

Private Sub scvTouchRef(Viewtag As Object, Action As Int, X As Float, Y As Float, MotionEvent As Object) As Boolean
    Select Action
        Case Activity.ACTION_DOWN
            Log("DOWN")
        Case Activity.ACTION_MOVE
            Log("MOVE")
        Case Activity.ACTION_UP
            Log("UP")
    End Select
End Sub

Private Sub Labels_Click
    Private lbl As Label
  
    lbl = Sender
    Log(lbl.Text)
End Sub

Thanks Klaus, it works, but, how can I resend the event to scrollview to make it scroll. The scroll stop working with this code

 

[marcoseinco]

Thanks Klaus, it works, but, how can I resend the event to scrollview to make it scroll. The scroll stop working with this code

I found the solution. Simply "return false" at the end of the fired touch event