B4J Question [abmaterial] why page.isdesktop return true

alwaysbusy

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• Jan 26, 2018

• #2

When do you call IsDesktop? Note that they are only valid AFTER running the UpdateFromCache() method.

 

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liulifeng77

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• Jan 26, 2018

• #3

in application,sub login.
there is not "UpdateFromCache" in it, maybe add it ?

 

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alwaysbusy

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• Jan 26, 2018

• #4

hmm, never been made to check it there. You can try adding an UpdateFromCache() in there, but I'm not sure what the consequences are going to be (I don't think this will ever be cleared for example).

In a future version of ABM, I could maybe expose the UserAgent parser in B4J so you could do Page.CheckDevice(req as ServletRequest).

Would return a string like this that you could parse:

B4X:

IsPhone:true;IsTablet:false;IsDesktop:false

 

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liulifeng77

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• Jan 26, 2018

• #5

I change my code like this:

B4X:

Dim device As String=ws.UpgradeRequest.GetHeader("USER-AGENT")
                If device.IndexOf("Macintosh")>-1 Or device.IndexOf("Windows NT")>-1 then
log("computer")

 

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alwaysbusy

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• Jan 26, 2018

• #6

You will not catch every desktop with that (linux, other windows versions etc). There is no perfect solution finding out on which device you are unfortunately.

The trick used in ABM is actually determine if it is a phone or tablet. If neither are true, then it is a desktop.

 

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liulifeng77

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• Jan 26, 2018

• #7

wait forage.CheckDevice(req as ServletRequest).
but I wonder know your solution(how to catch the device?),add all device name in a list?

 

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alwaysbusy

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• Jan 26, 2018

• #8

it is based on this project (not sure if it was that version I used):

https://github.com/steveswinsburg/mobile-detect

 

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