Finally

android/app/build.gradle

@@ -85,7 +85,7 @@ dependencies {
     androidTestImplementation 'androidx.test:runner:1.1.1'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
     implementation 'com.android.support:multidex:1.0.3'
-    implementation 'com.facebook.android:facebook-android-sdk:[5,6)'
+    implementation 'com.google.firebase:firebase-analytics:17.2.2'
 }
 
 

android/app/src/main/AndroidManifest.xml

@@ -28,6 +28,7 @@
                 <action android:name="FLUTTER_NOTIFICATION_CLICK" />
                 <category android:name="android.intent.category.DEFAULT" />
             </intent-filter> 
+
         </activity>
 
 >
@@ -37,7 +38,8 @@
         <meta-data
             android:name="flutterEmbedding"
             android:value="2" />
-
+        <meta-data android:name="com.google.android.geo.AIzaSyDlKjpnau7Pkr7SlWW6rYHL0pDk2r6PpDk"
+            android:value="AIzaSyDlKjpnau7Pkr7SlWW6rYHL0pDk2r6PpDk"/>
     <meta-data android:name="com.facebook.sdk.ApplicationId" 
         android:value="@string/facebook_app_id"/>
 
@@ -57,5 +59,5 @@
     </activity>
 
     </application>
-
+    
 </manifest>

cloud_functions/.firebaserc

@@ -0,0 +1,5 @@
+{
+  "projects": {
+    "default": "guava-27f21"
+  }
+}

cloud_functions/.gitignore

@@ -0,0 +1,65 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+firebase-debug.log*
+
+# Firebase cache
+.firebase/
+
+# Firebase config
+
+# Uncomment this if you'd like others to create their own Firebase project.
+# For a team working on the same Firebase project(s), it is recommended to leave
+# it commented so all members can deploy to the same project(s) in .firebaserc.
+# .firebaserc
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env

cloud_functions/firebase.json

@@ -0,0 +1,8 @@
+{
+  "functions": {
+    "predeploy": [
+      "npm --prefix \"$RESOURCE_DIR\" run lint",
+      "npm --prefix \"$RESOURCE_DIR\" run build"
+    ]
+  }
+}

cloud_functions/functions/.gitignore

@@ -0,0 +1,8 @@
+## Compiled JavaScript files
+**/*.js
+**/*.js.map
+
+# Typescript v1 declaration files
+typings/
+
+node_modules/