Learning Firebase - Basic Google Sign-in Application

13 Oct 2020

Introduction

This post is a resource and commentary on my experience using and setting up Firebase for Android. I’ve created this post as following the firebase help did not result in a verified application against my firebase console. Below lists a minimum basic set of settings required that I found worked for me.

Creating a new firebase project

Sign into Firebase
Create a new firebase project. To understand firebase projects go here

Creating a firebase app

Rough guide here

Create a new android studio blank activity project.

Modify project build.gradle to add classpath 'com.google.gms:google-services:4.3.4'

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    ext.kotlin_version = "1.4.10"
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath "com.android.tools.build:gradle:4.0.2"
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files

        classpath 'com.google.gms:google-services:4.3.4'
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

Modify application build.gradle to add firebase dependencies

apply plugin: 'com.android.application'
apply plugin: 'com.google.gms.google-services'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'

android {
    compileSdkVersion 29

    defaultConfig {
        applicationId "com.slowmonkeycodes.learning_firebase_android_app"
        minSdkVersion 27
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: "libs", include: ["*.jar"])
    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
    implementation 'androidx.core:core-ktx:1.3.2'
    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.2'
    testImplementation 'junit:junit:4.13'
    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'

    implementation 'com.google.android.gms:play-services-auth:18.1.0'
    implementation 'com.google.firebase:firebase-auth:19.4.0'
}

Setup the AndroidManifest.xml by ensuring <uses-permission android:name="android.permission.INTERNET"/> is added:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.slowmonkeycodes.learning_firebase_android_app">

    <uses-permission android:name="android.permission.INTERNET"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Connecting application and firebase together

Generate a signing report

Generate Signing Report

Follow Option 1 step in the above instructions.

Registering the Application
Add a Firebase configuration file to the android application
Enable firebase products in your app.
Add Firebase SDKs to your app. To find the latest libraries to add go here
Sync your app.

Full Application Example:

A full application example can be found here

The application is based on tutorials from the following sites:

Common errors

Installation error: INSTALL_FAILED_MISSING_SHARED_LIBRARY

Remove wearable inheritance (https://stackoverflow.com/questions/8620774/installation-error-install-failed-missing-shared-library)