Android Question Trying to print from webpage for bluetooth

[mrjaw]

Hi!
I am have an web app that is responsive. It works so fine on cel and tablet but now I have a problem, I need to print something from that page. I use chinese printers , printing by bluetooth , I am trying to print it.
I think to do an app that read something from page and print it.

Somebody here has any cluue to do a "printserver" or comunicate both app , app and webpage.

The idea would be :

webpage <--> app <--> printer

or if I can print from webpage using bluetooth like rawprint , I wanna hear.....

Thks

 

[Erel]

You can start your app by clicking on a link with a special scheme. You will need to find a way to pass the information to the native app.

 

[mrjaw]

Precisely, Erel, anybody has any cluee how to pass this information to native app ??

Any cluee"?

 

[mrjaw]

I am thinking to use cookies to save the info to cimunicate with native app. Where android save the cookies>?

 

[DonManfred]

B4A does not save any Cookies. Android even does not do it. The Browser is responsible for saving (and reloading) cookies

If you know how to print with b4a then you can call the webside inside a webview with webviewextras and javascriptinterface.
You then send build your own solution to call a sub giving some data in your app from your webpage (you need to have access to the webside though)

Or is the webside not YOUR webside?

 

[mrjaw]

It is my website, the idea was save into a cookie the info to print so an app service check for this cookie and take the info to print

 

[DonManfred]

It is my website, the idea was save into a cookie the info to print so an app service check for this cookie and take the info to print

You dont need cookies or whatever... Insert javascript in your webside to send data like in the Webviewextras-example (escpecially WebViewExtrasDemo).
See this code and have a look at the html-code to understand what´s happening

Sub GetString As String
    Return "This is a string from the B4A demo code"
End Sub
Sub ShowToast(Message As String)
    ToastMessageShow(Message, True)
End Sub

Spoiler: showToast

Click <a href="javascript:void(0)" onclick="B4A.CallSub('ShowToast', true, 'Hello from javascript')">HERE</a> to call a Sub in the B4A demo code.

Spoiler: GetString

Click <a href="javascript:void(0)" onclick="alert(B4A.CallSub('GetString', false))">HERE</a> to call a Sub in the B4A demo code which will return a string to this page.<br />
A B4A Sub can only return a (string) value to the javascript if the CallSub() method is passed boolean false as <b>callUIThread</b>.

So. If you know html and javascript then you can easily build a communication from your webpage with javascript to your app.

If you know how to print data from within b4a too then you should be able to pass all the needed data to print with CallSub

 

[mrjaw]

Where can I download this library ?WebViewExtras

 

[DonManfred]

Have you tried to search the forum for webviewextras? I believe no

https://www.b4x.com/android/forum/threads/webviewextras.12453/

 

[mrjaw]

I got it!