QGoogleSignIn

QGoogleSignIn is an Android application demonstrating Google Sign In authentication in Firebase. It is a prototype built in C++ using Qt and QML. Parts of QGoogleSignIn are written in Java, in order to directly access the Google Sign In API. All Firebase code is based upon the Firebase C++ SDK.

What can I do with it ?

This code allows you to use the following authentication methods with Firebase in C++ :

• Google Sign In
• Email + password
• Anonymous

Linking accounts is also handled.

Is it production-ready ?

No. Not at all. It is a Work In Progress. Many use cases can be handled, but not all. There's still work to do.

How can I use it ?

It can be useful to add Google Sign In authentication to your Android mobile app made with Qt. If you do not code in C++, or not for Android, it may not be useful.

Below, this is NOT a step by step build procedure. It should be sufficient to have you getting the app running.

Prerequisites :

• Qt (tested with 5.11.1)
• Android SDK (I use Android Studio and its SDK manager to pick the versions)
• Android NDK (version r10e, from the archives)

Useful :

• QtCreator for C++ editing (tested with 4.7.0)
• Android Studio for Java editing (tested with 3.1.3)

Steps to build :

• download firebase SDK, install it anywhere (tested with 5.3.0)
• gradle should download automatically Java dependencies
• you need to create a Firebase project, and add your client application to it
• you need to allow Google Sign In authentication on your project
• you have to download you google-services.json file in the android directory
• you have to set the correct paths and versions in local.properties and gradle.properties (using local.properties.template and gradle.properties.template if you want)
• you also have to set the correct path in the local_defines.pri file (using local_defines.pri.template if you want)

When updating from this repository, check for changes in the template files, to see if you should modify something.