Android Question change checkbox on HTML page


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Hello to all !!! ;)

I have an app that, on an activity, it needs to show this page to the user for to view "TV Guide":

Very very simple, I use WebView and it works:
Dim wv As WebView

Activity.AddView(wv, 0, 0, 100%x, 100%y)

But now, since there aren't all the channels that I want, the user needs to click on "Por canal" (on upper-right), then he needs to select usually 22 channels, and then confirm with "ver programaciòn" for to view the rights channels (that is the same channels that he can to view with my app).

This operation needs to do every time, but I don't like it !
When my app show this page with WebView, is there a system for to select channels in automatic mode ??
Can I insert JavaScript source in this page for to change checkboxes programmatically ??
(you can see checkboxes on source HTML from line 1110)

Or, do I need to change WebView with other object or other system ??

Many thanks