Because the app works on some phones and not others?

[mauri74doc]

Hello to all. I am developing a small application and for the sake, I started to test it on some phones and tablets (of course I know about these is installed Android). With gramde my surprise, I discovered that the application works on smartphones are not recent (maybe a couple of years old), while on other devices (much more recent, present day) the same application is not recognized (I add that each device is however riconosiuto from pC via USB, as the driver installation is automatic). But when I launch the debug, B4A tells me to connect a device, so there is recognition. For example, when a galaxy samsugn giò the app works great, but on a samsung note 2 no!
Someone knows how to give an answer? The B4A has been updated to version 2.3.
Thanks for your help!

 

[margret]

It is not B4A that is an issue, it is the ADB drivers. Hook each device/phone to the computer, just one device at a time. Then from a DOS window type:

adb kill-server
adb start-server
adb devices

Do this for each device. When you issue the last command adb devices. If no list is shown, you do not have the drivers for that device installed or they are not installed right.

If no device shows, you can type at the DOS Prompt:

android update adb

Then type all three commands above again and see if it shows. If it still does not show, you can try B4A Bridge, it's a free download on the market.