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How to import Android gradle dependencies in React Native

I have a React Native app that should use a Wi-Fi for connecting and getting some data. I have a custom Wi-Fi library written in Java and it was used for native Android apps. Now I want to use this library for my react-native app. How can I use it in my react-native app? Any detailed information would help me.
Thank you very much for your time and assistance in this matter.

If you have already written a library in java then you can use that library in android by following the steps mentioned in the link below:-
https://facebook.github.io/react-native/docs/native-modules-android.html
If you still have any issues then please let me know.
EDIT:-
You can use your native module after providing that in getPackages inside your react native components as below:-
Create a file and use your native module and export it so that you can use it inside your components:-
import {NativeModules} from 'react-native';
module.exports = NativeModules.ToastExample; //here ToastExample is the name of your native module.
Then import your module inside your component and you can use its further functions/methods as below:-
import ToastExample from './ToastExample';
ToastExample.show('Awesome', ToastExample.SHORT);

How to use Google Drive Api in Eclipse?

For the past few days I've been trying to upload and download files from Google Drive using Java. I've seen some tutorials on the internet but they all used Gradle and I need to do this in Eclipse. I can't use Gradle because it does not work with other parts of the project.
Does anyone know how to upload/download files in Google Drive using Java (Eclipse Neon)? Thanks.

You can also use Maven or just simply add the Drive client library to your project. Check out this page for Maven/download links:
https://developers.google.com/api-client-library/java/apis/drive/v2
Once you have the necessary jar in your project, you should be able to follow the existing tutorials on how to use Drive, e.g.:
https://developers.google.com/drive/v2/web/examples/

Creating and testing a jar with AndroidStudio

I want to create a jar file (there are no resources associated with it) using AndroidStudio that accesses our server APIs and will be used in several as yet unwritten Android apps. I also want to be able to test these APIs outside of an android app. It doesn't use any android libraries. My questions are 1) how do I configure gradle to just build a jar file? 2) What's the best way to exercise this code in AndroidStudio? Writing a small wrapper that includes a main function that imports the jar file? Writing a toy Android app that exercises the code? Or is my approach completely wrong?

If it doesn't use Android libraries, then why are you trying to create a .jar file in Android Studio? Just use ant. It's the same process as creating a .jar file for Volley, which is detailed in this SO question.

How to use external jar library in a SAP HANA XS project

I am trying to make an XS project in HANA which will use some of the classes and methods that can be found in a .jar file. These classes and methods will do some calculations and present it to the user in the UI.
The question is: How do I access methods and classes of that .jar file?
I have registered it as an external library, but I have no idea how to call it from my XS javascript source files.

there's no way to invoke external .jar package from XS's server-side JavaScript. You can use an external library using function "$.import", but this is only valid for JavaScript library.

XS Server does not and will not support Java. Only Javascript...

If you want to outsource some of your xsjs functions to an external library, xsengine provides a special format for this, called ".xsjslib".
You can import a library using the following code:
$.import("<package_your_library_was_deployed>","yourLib");
access functions inside your lib by this path:
$.path.to.your.library.filename.yourFunction();

Replace android default sqlite build

I would like to replace android default sqlite build for a new one having rtree feature enabled. It looks like I have to use a java wrapper to accomplish that and the only one I found android compatible was sqlite4java. I prefer sticking with standards. Unfortunately I found out jdbc is not supported in dalvikvm (Androids VM) and native android.database.sqlite works with an rtree disabled build of sqlite.
Currently I have a new .so sqlite rtree enabled library compiled for android but would like to substitute androids native one without having to use a third party wrapper like sqlite4java. Any ideas? I was thinking about downloading android.database.sqlite package from android sdk and building a jar to substitute only the .so load withing my application context. Is that the best approach?

I was thinking about downloading android.database.sqlite package from android sdk and building a jar to substitute only the .so load withing my application context. Is that the best approach?
So long as you are willing to refactor all necessary classes into your own package, that is probably your only approach. For example, that is what SQLCipher for Android does. They cloned ~37 classes from android.database and android.database.sqlite and modified them to use their own SQLCipher-enabled build of SQLite.