How to use matterJS in react native without react native game engine - react-native

I have been using matterJS in react native with the help of RNGE for game development. But now i thing I dont need any loop in my game and RNGE is used for having loop feature in app. So want to add matterJS with out react native game engine

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Can a react native app become a flowting window on top of other app?

Does any one know if a react native app can become a flowting window and be on top of other app?
(Not other app or view floating in a react native app)
Thank you.
I know there are ways that you can have a floating view inside a react native app.
But seems there are not too many third party library that support my need.

how to implement activity recognition in react native?

I want to implement activity recognition with react native any one can suggest me which package/library is the best which works well with react native.

react native music controll, AVExpo and react native sound

Hello I just would like to know if react native music control is compatible with the audios that can be recorded with AVExpo or in order to use react native music control I must use react native sound? If that is the case, is the recording of AVExpo and react native sound compatible? Thank you in advance.

Applock using react native

I am very new to react-native. I want to create an app which can lock and unlock other apps similar to applock, but I want to add custom logic which will do this.
Is it possible to create with React native?

React native for android

Can I use react native as a backend in Android
I want to use all the UI components from Android only but for the logic part I want to call react native and do the backend there
Is it possible ?
Let me summarize your question to see if I got it right: You would like to use Native UI Components in Android and compose/utilize them using React Native.
If so the answer is yes. React Native does nothing else under the hood, they try to map as directly as possible to the native UI concepts. If this is still too much JS UI layer for you, you can directly implement the Native UI Components you need and bridge them into React Native, as to be seen here.
As React native is doing for us to convert and other component in native android component. If you don't want to use this react native component code then you have to create native android module in react native to use native component. But it's not advisable.