osu-lazer/osu.Android/OsuGameAndroid.cs

// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.

using System;
using Android.App;
using Android.OS;
using osu.Game;
using osu.Game.Updater;

namespace osu.Android
{
    public class OsuGameAndroid : OsuGame
    {
        public override Version AssemblyVersion
        {
            get
            {
                var packageInfo = Application.Context.ApplicationContext.PackageManager.GetPackageInfo(Application.Context.ApplicationContext.PackageName, 0);

                try
                {
                    // We store the osu! build number in the "VersionCode" field to better support google play releases.
                    // If we were to use the main build number, it would require a new submission each time (similar to TestFlight).
                    // In order to do this, we should split it up and pad the numbers to still ensure sequential increase over time.
                    //
                    // We also need to be aware that older SDK versions store this as a 32bit int.
                    //
                    // Basic conversion format (as done in Fastfile): 2020.606.0 -> 202006060

                    // https://stackoverflow.com/questions/52977079/android-sdk-28-versioncode-in-packageinfo-has-been-deprecated
                    string versionName = string.Empty;

                    if (Build.VERSION.SdkInt >= BuildVersionCodes.P)
                    {
                        versionName = packageInfo.LongVersionCode.ToString();
                        // ensure we only read the trailing portion of long (the part we are interested in).
                        versionName = versionName.Substring(versionName.Length - 9);
                    }
                    else
                    {
#pragma warning disable CS0618 // Type or member is obsolete
                        // this is required else older SDKs will report missing method exception.
                        versionName = packageInfo.VersionCode.ToString();
#pragma warning restore CS0618 // Type or member is obsolete
                    }

                    // undo play store version garbling (as mentioned above).
                    return new Version(int.Parse(versionName.Substring(0, 4)), int.Parse(versionName.Substring(4, 4)), int.Parse(versionName.Substring(8, 1)));
                }
                catch
                {
                }

                return new Version(packageInfo.VersionName);
            }
        }

        protected override UpdateManager CreateUpdateManager() => new SimpleUpdateManager();
    }
}