Android Question hyperlink click capture

Rusty · Apr 29, 2018

Is there a way using a WebView (or other), to capture the click event (or any event prior to navigation) of an embedded hyperlink?

B4X:

<html><body>
<a href="https://www.b4x.com/index.html"</a>
</body></html>

When the user clicks the hyperlink, I would like to intercept it. Is this possible?
Thanks,
Rusty

Semen Matusovskiy · Apr 29, 2018

WebView has a special event OverrideUrl, for instance, Sub WebView1_OverrideUrl (Url As String) As Boolean
Return true to "disable" click

For labels it's possible to use https://www.b4x.com/android/forum/threads/charsequence-csbuilder-tutorial.76226/ See Clickable text

Erel · Apr 30, 2018

If you want to show the text with a Label then you can use CSBuilder with a Regex pattern that find the links: https://www.b4x.com/android/forum/threads/csbuilder-marking-based-on-regex-pattern.83002/#content

The pattern is:

B4X:

urlpattern = $"(?i)\b((?:https?:(?:/{1,3}|[a-z0-9%])|[a-z0-9.\-]+[.](?:com|net|org|edu|gov|int|jobs|mobi|museum|name|post|pro|tel|travel|xxx|ac|ad|ae|af|ag|ai|al|am|an|ao|aq|ar|as|at|au|aw|ax|az|ba|bb|bd|be|bf|bg|bh|bi|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|cr|cs|cu|cv|cx|cy|cz|dd|de|dj|dk|dm|do|dz|ec|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gg|gh|gi|gl|gm|gn|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|im|in|io|iq|ir|is|it|je|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|me|mg|mh|mk|ml|mm|mn|mo|mp|mq|mr|ms|mt|mu|mv|mw|mx|my|mz|na|nc|ne|nf|ng|ni|nl|no|np|nr|nu|nz|om|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|ps|pt|pw|py|qa|re|ro|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|Ja|sk|sl|sm|sn|so|sr|ss|st|su|sv|sx|sy|sz|tc|td|tf|tg|th|tj|tk|tl|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|yu|za|zm|zw)/)(?:[^\s()<>{}\[\]]+|\([^\s()]*?\([^\s()]+\)[^\s()]*?\)|\([^\s]+?\))+(?:\([^\s()]*?\([^\s()]+\)[^\s()]*?\)|\([^\s]+?\)|[^\s`!()\[\]{};:'".,<>?«»“”‘’])|(?:(?<!@)[a-z0-9]+(?:[.\-][a-z0-9]+)*[.](?:com|net|org|edu|gov|mil|aero|asia|biz|cat|coop|info|int|jobs|mobi|museum|name|post|pro|tel|travel|xxx|ac|ad|ae|af|ag|ai|al|am|an|ao|aq|ar|as|at|au|aw|ax|az|ba|bb|bd|be|bf|bg|bh|bi|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|cr|cs|cu|cv|cx|cy|cz|dd|de|dj|dk|dm|do|dz|ec|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gg|gh|gi|gl|gm|gn|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|im|in|io|iq|ir|is|it|je|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|me|mg|mh|mk|ml|mm|mn|mo|mp|mq|mr|ms|mt|mu|mv|mw|mx|my|mz|na|nc|ne|nf|ng|ni|nl|no|np|nr|nu|nz|om|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|ps|pt|pw|py|qa|re|ro|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|Ja|sk|sl|sm|sn|so|sr|ss|st|su|sv|sx|sy|sz|tc|td|tf|tg|th|tj|tk|tl|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|yu|za|zm|zw)\b/?(?!@)))"$

Code that works with both B4A and B4i:

B4X:

Public Sub MarkPattern(cs As CSBuilder, Input As String) As CSBuilder
   Dim lastMatchEnd As Int = 0
   Dim m As Matcher = Regex.Matcher(urlpattern, Input)
   Do While m.Find
       Dim currentStart As Int = m.GetStart(0)
       cs.Append(Input.SubString2(lastMatchEnd, currentStart))
       lastMatchEnd = m.GetEnd(0)
       'apply styling here
       cs.Underline
       cs.Color(0xFF005DFF)
       #if B4i
       cs.Link(m.Group(0))
       #else
       cs.Size(20)
       cs.Clickable("cs", m.Group(0))
      
       #end if
       cs.Append(m.Group(0))
       cs.Pop.Pop.Pop 'number should match number of stylings set.
       If xui.IsB4A Then cs.Pop
   Loop
   If lastMatchEnd < Input.Length Then cs.Append(Input.SubString(lastMatchEnd))
   Return cs
End Sub

Android Question hyperlink click capture

Rusty

Well-Known Member

Semen Matusovskiy

Well-Known Member

Erel

B4X founder

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