Can I call a java function with react (native)? [duplicate] - java

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I have an exiting Android app that uses Java and XML. I want to reface it, and i need informations.
This app use Android specification like the mobile position, modification of te current antenna (2G, 3G, 4G, 5G) ... and a local database with SQLite.
So I need to know if i can make my graphical interface with react and have interactions whith my java code to access to this Android properties. Is it possible to call java functions with react native ?
Can i use React or did i just have to use XML like i did before ?

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How can we implement incoming UI call screen in java just like in flutter we do with flutter callkit incoming package? [closed]

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I want to show the incoming call UI screen like this https://cdn.dribbble.com/users/1191071/screenshots/9095799/01_incoming_call_whitebg.png?compress=1&resize=400x300 . How can I achieve this in java? Please help.. Is there any prebuilt java or kotlin package to show like this. Because flutter already has one package to show like this.
Just use the following package Flutter Incoming Call. I've used it and it works great.

Make Notice Board Android Studio [closed]

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I want to make a notice board for the user in android studio. Admin makes notice for user and User can able to see the notice. How can I do that? there is two activity one for Admin and the Second for users. there will be a firebase for the data store.
Note: It will be java based project
1)Write Frontend part
2)Write Backend part
3)Don't forget to write the logic to connect to the db with your backend
4)Most importantly, read the rules of SO before posting anything like this

How to make a searchIndex in android with java [closed]

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I try make an android app with java and have a problem with searchIndex
I just don't know ho to make it right
I already used lucene in C# but I want to know if I could use it in java.
Yes there is also a library of Lucene in java and you can use it in android applications.
But there is a native full text search feature called FTS and and also new version FTS4 in SQLite , which you can use in android easily and it has a better performance and response time since its running natively and so much faster because uses less memory than java Lucene impelementation.
You can see a sample here : http://www.mysamplecode.com/2011/11/android-searchview-using-sqlite-fts3.html
and also full documentation here : http://www.sqlite.org/fts3.html

Create Android Wifi Chat application [closed]

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I am totally new to android as well as java for android programming.
I have to create an android app which uses wifi to chat with the devices available in the available wifi area.
I wouls like to know how can i implement this?
What are the requirements to create such app?
If it is already created, i would like to download one for the reference purpose.
Kindly help me.
Google already released an example doing just this using the wifi discovery service API that was added into Android 4. You can find it here.

Embed JVM into micro-controller [closed]

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I am new in embedded world. May be I am wrong. But I want a relevant solution.
I just want to embed java environment into a MCU for ease to develop application. The MCU vendor have provide the C library for lcd, sensor, spi, buttons, UART, DIO etc etc. Can I embed java into this ?? I mean, I want to use java on the MCU, uppon those device drivers.
Can I use or make something like this??
I have seen the simple Real-Time-Java it's very tiny.
Thank you.
Take a look at NanoVM and Bajos.

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