Android Studio - Multiple Bluetooth Connection - java

I'm making a project where I need to connect via my Android Studio App two devices and continously send and recieve information.
How can I make this in terms of code in the Android Studio Java language?
Thanks

You can find this library useful. Here is a tutorial on how to use it.

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Integrate an react native app with the contacts

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You can check this anwser Integrate my app with Contact , it shows how to do it with Java at an Android App.
Regards,

Emulated DJI Mobile SDK keeps

In the context of an university project, we want to develop an Android app (Java) using the DJI Mobile SDK (4.11) to control a DJI Mavic 2.
Our created/ downloaded apps like the DJI SDK samples can be run on mobile phones after building them as APKs but we didn´t accomplish to emulate them in Android Studio (3.5.1). Already read that it wouldn´t be possible but developing an app without testing it in the IDE won´t be practicable for us...
Is there any option?
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The best option, and one I tend to leverage is use the simulator. I almost bench fly more than I fly outside.
I cannot think of another option of hand.

How to make web service for insert image to server with Spring?

I want to learn about insert image to server with android studio and back-end using Spring, some tutorial on google its doesn't work. by the way i tried on android Nougat, Thanks.
What do you mean by Insert Image on Server? Android studio and Spring are two different things. Android Studio is an IDE used for developing android apps and Spring is a framework.
Be very clear with your questions first then only you will get useful contents, even on google too. I am hoping that you need a webservice which you will call from android app and upload an image on server?

why is android emulator on local network offline?

I am developing an android application on android studio. but because of my hardware limits I'd like to test the results through an android studio emulator which is on another computer in my local network.
I've read the tutorial on this page :
I did all of the steps on the page and I can see the device on android studio (on the my remote pc) but it appears to be offline .
any ideas why is this happening?
You can use this tutorial:
https://bitbucket.org/chabernac/adbportforward/wiki/Home
Best Regards,
SanatiSharif

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