Android Question Is there any way to stop the previous event when I start the new event?

Sub PanelEdBtPlay_Click
    PanelEdByPlayIndex = PanelEdByPlayIndex + 1 'global variable
    Dim MyIndex = PanelEdByPlayIndex
    edEfeito.Text = "1 "
    EditText1.Text = edEfeito.Text
    SendMessage(Array As Byte(EditText1.Text))
    edLogTemp.Text = edLogTemp.Text & EditText1.Text
    Sleep(1000)
    If MyIndex <> PanelEdByPlayIndex Then Return

    edEfeito.Text = "2 "
    EditText1.Text = edEfeito.Text
    SendMessage(Array As Byte(EditText1.Text))
    edLogTemp.Text = edLogTemp.Text & EditText1.Text
    Sleep(1000)
        If MyIndex <> PanelEdByPlayIndex Then Return

    edEfeito.Text = "3 "
    EditText1.Text = edEfeito.Text
    SendMessage(Array As Byte(EditText1.Text))
    edLogTemp.Text = edLogTemp.Text & EditText1.Text
    Sleep(1000)
        If MyIndex <> PanelEdByPlayIndex Then Return

    edEfeito.Text = "4 "
    EditText1.Text = edEfeito.Text
    SendMessage(Array As Byte(EditText1.Text))
    edLogTemp.Text = edLogTemp.Text & EditText1.Text
    Sleep(1000)
            If MyIndex <> PanelEdByPlayIndex Then Return
End Sub

Sub Process_Globals
    'These global variables will be declared once when the application starts.
    'These variables can be accessed from all modules.
    Dim PanelEdByPlayIndex As Int
End Sub