MainActivity.cs

using Android.App;
using Android.Content.PM;
using Android.OS;
using HockeyApp.Android;
using FFImageLoading.Forms.Droid;
using HockeyApp.Android.Utils;
using Plugin.Media;
using Plugin.Permissions;

namespace Merrit.Droid
{
    [Activity(Label = "Merrit", Icon = "@drawable/icon", Theme = "@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
    {
        protected override void OnCreate(Bundle bundle)
        {
            TabLayoutResource = Resource.Layout.Tabbar;
            ToolbarResource = Resource.Layout.Toolbar;

            InitLibraries();
            InitHockeyApp();

            base.OnCreate(bundle);

            global::Xamarin.Forms.Forms.Init(this, bundle);
            LoadApplication(new App());
        }

        public override void OnRequestPermissionsResult(int requestCode, string[] permissions, Permission[] grantResults)
        {
            PermissionsImplementation.Current.OnRequestPermissionsResult(requestCode, permissions, grantResults);
        }

        private void InitHockeyApp()
        {
            HockeyLog.LogLevel = 4;
            CrashManager.Register(this, "myAppId");
            UpdateManager.Register(this, "myAppId");
        }

        private void InitLibraries()
        {
            var x = typeof(Xamarin.Forms.Themes.LightThemeResources);
            x = typeof(Xamarin.Forms.Themes.Android.UnderlineEffect);

            CachedImageRenderer.Init();
            CrossMedia.Current.Initialize();
        }

        private void UnregisterManagers()
        {
            UpdateManager.Unregister();
        }

        protected override void OnPause()
        {
            base.OnPause();
            UnregisterManagers();
        }

        protected override void OnDestroy()
        {
            base.OnDestroy();
            UnregisterManagers();
        }
    }
}