Android Question Link in WebView calls B4A subroutine?

canalrun

Well-Known Member
Licensed User
Longtime User
in B4A I currently dynamically create a small, simple webpage (as a string, s1) and load it into a WebView using: wv.LoadHtml(s1).

Is it possible, as I'm creating the webpage, to create a link within the webpage that when clicked will cause the B4A program to call a subroutine?

(The B4A subroutine I'm thinking about will restore marker points from a file and display them on a map)

Nothing too complicated.

Thanks,
Barry.
 
Sort by date Sort by votes

canalrun

Well-Known Member
Licensed User
Longtime User
HAH said:
or simply use webview override event and consume it.
Click to expand...

Thanks. That works very well.

In my html file I embedd a link:

B4X: 
<a href="reload:xxxx">Reload</a>

When I click on the link the following code runs (my WebView is named wvSession):

B4X: 
Sub wvSession_OverrideUrl (Url As String) As Boolean
  If (Url.IndexOf("reload:") > -1) Then
    Dim id As String = Url.SubString2(7, Url.Length)
    
    Log("id: " & id)
    ReloadSession(id)
    
    Return(True)
  End If
End Sub

Sub ReloadSession(id As String)
  Dim slst As List
 
  slst = File.ReadList(File.DirDefaultExternal, "Sessions.txt")
 
  For Each s1 As String In slst
    If ((s1.Contains("<!--")) And (s1.Contains(id))) Then
      Log("found id: " & s1)
    End If
  Next
End Sub

I am looking for an html comment line that contains the "id" in the file Sessions.txt.

Barry
 
Upvote 0

canalrun

Well-Known Member
Licensed User
Longtime User
Yes, works very well.

I dynamically generate a "session" and append it to a file called Sessions.txt. Each "session" is an exercise session. The session block contains parameters such as ID, duration, laps, and time, plus I repeat the parameters in an HTML comment comma separated string that can later be restored to the screen display to remind me of that exercise session. I restore the session by clicking the dynamically generated link (containing the session ID) that is saved as part of the session block.

Thanks for the idea.
 
Last edited:
Upvote 0
You must log in or register to reply here.

Similar Threads

  • Solved
Android Question WebView: how to disable dragging of links?
Replies
5
Views
4K
Sandman
E
  • Question
Android Question Blank Webpage with WebView
Replies
1
Views
2K
Erel
  • Question
Android Question How to obtain the current webpage title of the Webview?
Replies
2
Views
4K
aironium
  • Article
Android Tutorial [B4X] WebView + CKEditor (rich text editor)
Replies
9
Views
12K
Erel
  • Question
Android Question Getting the source code of a webpage with WebView and WebViewExtras
Replies
17
Views
28K
adrianstanescu85
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…