Detect Android projects

What does this MR do and why?

This MR implements Programmatically collect is_creating_android_app (gitlab-org/growth/team-tasks#574)

It updates Projects::RecordTargetPlatformsWorker introduced in !80361 (merged) to handle projects that use Java and Kotlin programming languages. If a project uses Java or Kotlin, the worker executes an instance of a new service (Projects::AndroidTargetPlatformDetectorService) to determine if the project is an Android project by checking if the file AndroidManifest.xml is present in the project's repository.

This detection is done so we can run experiments on Android projects in gitlab.com (e.g. suggest to project members to use `.gitlab-ci.yml specific for Android projects).

Feature flag

The changes in this MR are behind the detect_android_projects feature flag with Project as the actor.

Screenshots or screen recordings

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How to set up and validate locally

Start GDK

Start your GDK simulating gitlab.com

1. $ export GITLAB_SIMULATE_SAAS=1
2. gdk start

Enable required feature flags

Feature.enable(:record_projects_target_platforms)
Feature.enable(:detect_android_projects)

Detect target platforms after branch push

1. Create a new project and clone it locally

2. Push a .java file to the repo. This will trigger language detection which is required by the android platform detection worker

   Java code

      import java.util.Scanner;
   
   public class HelloWorld {
   
       public static void main(String[] args) {
   
           // Creates a reader instance which takes
           // input from standard input - keyboard
           Scanner reader = new Scanner(System.in);
           System.out.print("Enter a number: ");
   
           // nextInt() reads the next integer from the keyboard
           int number = reader.nextInt();
   
           // println() prints the following line to the output screen
           System.out.println("You entered: " + number);
       }
   }

3. Commit the change and push: $ git add -A; git commit -m 'add a java file';git push

4. Wait for the language detection to finish

   Repo should look like this

   

5. Push an AndroidManifest.xml file to the repo

   File contents

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

   # create the dirs
   $ mkdir app/src/main/
   # create the file
   $ touch app/src/main/AndroidManifest.xml
   # paste the file contents then save it

6. Commit the change and push: $ git add -A; git commit -m 'add android manifest file';git push

7. Wait a while for background jobs to finish (you can check by searching Projects::RecordTargetPlatformsWorker while running gdk tail rails-background-jobs)

8. In Rails console, Verify that a ProjectSetting record is created with target_platforms value of ["android"]

   ProjectSetting.find_by_project_id(Project.last.id).target_platforms
   => ["android"]

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.