android/app/build.gradle

@@ -22,6 +22,7 @@ if (flutterVersionName == null) {
 }
 
 apply plugin: 'com.android.application'
+apply plugin: 'com.google.gms.google-services'
 apply plugin: 'kotlin-android'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
@@ -43,8 +44,8 @@ android {
 
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
-        applicationId "com.example.flutter_applicationdemo"
+        applicationId "com.pvt74.sunchaser"
-        minSdkVersion 20
+        minSdkVersion 21
         targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
@@ -65,4 +66,10 @@ flutter {
 
 dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    implementation platform('com.google.firebase:firebase-bom:30.0.0')
+    implementation 'com.google.firebase:firebase-auth'
+    
+
 }
+
+

android/app/src/main/AndroidManifest.xml

@@ -4,6 +4,8 @@
         android:label="flutter_applicationdemo"
         android:name="${applicationName}"
         android:icon="@mipmap/ic_launcher">
+        <meta-data android:name="com.google.android.geo.API_KEY"
+        android:value="AIzaSyAUmhd6Xxud8SwgDxJ4LlYlcntm01FGoSk"/>
         <activity
             android:name=".MainActivity"
             android:exported="true"
@@ -20,8 +22,6 @@
               android:name="io.flutter.embedding.android.NormalTheme"
               android:resource="@style/NormalTheme"
               />
-            <meta-data android:name="com.google.android.geo.API_KEY"
-               android:value="AIzaSyAUmhd6Xxud8SwgDxJ4LlYlcntm01FGoSk"/>
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
                 <category android:name="android.intent.category.LAUNCHER"/>

android/build.gradle

@@ -8,6 +8,7 @@ buildscript {
     dependencies {
         classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+        classpath 'com.google.gms:google-services:4.3.10'
     }
 }
 

android/flutter_applicationdemo_android.iml

@@ -1,29 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module type="JAVA_MODULE" version="4">
-  <component name="FacetManager">
-    <facet type="android" name="Android">
-      <configuration>
-        <option name="ALLOW_USER_CONFIGURATION" value="false" />
-        <option name="GEN_FOLDER_RELATIVE_PATH_APT" value="/gen" />
-        <option name="GEN_FOLDER_RELATIVE_PATH_AIDL" value="/gen" />
-        <option name="MANIFEST_FILE_RELATIVE_PATH" value="/app/src/main/AndroidManifest.xml" />
-        <option name="RES_FOLDER_RELATIVE_PATH" value="/app/src/main/res" />
-        <option name="ASSETS_FOLDER_RELATIVE_PATH" value="/app/src/main/assets" />
-        <option name="LIBS_FOLDER_RELATIVE_PATH" value="/app/src/main/libs" />
-        <option name="PROGUARD_LOGS_FOLDER_RELATIVE_PATH" value="/app/src/main/proguard_logs" />
-      </configuration>
-    </facet>
-  </component>
-  <component name="NewModuleRootManager" inherit-compiler-output="true">
-    <exclude-output />
-    <content url="file://$MODULE_DIR$">
-      <sourceFolder url="file://$MODULE_DIR$/app/src/main/java" isTestSource="false" />
-      <sourceFolder url="file://$MODULE_DIR$/app/src/main/kotlin" isTestSource="false" />
-      <sourceFolder url="file://$MODULE_DIR$/gen" isTestSource="false" generated="true" />
-    </content>
-    <orderEntry type="jdk" jdkName="Android API 29 Platform" jdkType="Android SDK" />
-    <orderEntry type="sourceFolder" forTests="false" />
-    <orderEntry type="library" name="Flutter for Android" level="project" />
-    <orderEntry type="library" name="KotlinJavaRuntime" level="project" />
-  </component>
-</module>

lib/GoogleSignInProvider.dart

@@ -0,0 +1,28 @@
+import 'package:firebase_auth/firebase_auth.dart';
+import 'package:flutter/material.dart';
+import 'package:google_sign_in/google_sign_in.dart';
+
+
+class GoogleSignInProvider extends ChangeNotifier {
+
+  var googleSignIn = GoogleSignIn();
+  GoogleSignInAccount? user;
+
+  
+
+  logIn() async {
+    this.user = await googleSignIn.signIn();
+    notifyListeners();
+  }
+
+  logOut() async {
+    this.user = await googleSignIn.signOut();
+    notifyListeners();
+  }
+
+  printUserInfo() {
+    return this.user.toString();
+  }
+
+
+}