protected override void OnCreate(Bundle savedInstanceState) { base.OnCreate(savedInstanceState); SetContentView(Resource.Layout.activity_page_preview); var toolbar = FindViewById <AndroidX.AppCompat.Widget.Toolbar>(Resource.Id.toolbar); SetSupportActionBar(toolbar); SupportActionBar.Title = Texts.scan_results; SupportActionBar.SetDisplayHomeAsUpEnabled(true); SupportActionBar.SetDisplayShowHomeEnabled(true); var fragment = SupportFragmentManager.FindFragmentByTag(FILTERS_MENU_TAG); if (fragment != null) { SupportFragmentManager.BeginTransaction().Remove(fragment).CommitNow(); } filterFragment = new FilterBottomSheetMenuFragment(); var fragment2 = SupportFragmentManager.FindFragmentByTag(SAVE_MENU_TAG); if (fragment2 != null) { SupportFragmentManager.BeginTransaction().Remove(fragment2).CommitNow(); } saveFragment = new SaveBottomSheetMenuFragment(); adapter = new PageAdapter(); adapter.HasStableIds = true; adapter.Context = this; recycleView = FindViewById <RecyclerView>(Resource.Id.pages_preview); recycleView.HasFixedSize = true; recycleView.SetAdapter(adapter); var layout = new GridLayoutManager(this, 3); recycleView.SetLayoutManager(layout); adapter.SetItems(PageRepository.Pages); progress = FindViewById <ProgressBar>(Resource.Id.progressBar); var addPage = FindViewById <TextView>(Resource.Id.action_add_page); addPage.Text = Texts.add_page; addPage.Click += delegate { var configuration = new DocumentScannerConfiguration(); configuration.SetCameraPreviewMode(CameraPreviewMode.FillIn); configuration.SetIgnoreBadAspectRatio(true); var intent = DocumentScannerActivity.NewIntent(this, configuration); StartActivityForResult(intent, CAMERA_ACTIVITY); }; var results = FindViewById <TextView>(Resource.Id.scan_results); results.Text = Texts.scan_results; delete = FindViewById <TextView>(Resource.Id.action_delete_all); delete.Text = Texts.delete_all; delete.Click += delegate { PageRepository.Clear(); adapter.NotifyDataSetChanged(); delete.Enabled = false; filter.Enabled = false; save.Enabled = false; }; filter = FindViewById <TextView>(Resource.Id.action_filter); filter.Text = Texts.filter; filter.Click += delegate { var existing = SupportFragmentManager.FindFragmentByTag(FILTERS_MENU_TAG); filterFragment.Show(SupportFragmentManager, FILTERS_MENU_TAG); }; save = FindViewById <Button>(Resource.Id.action_save_document); save.Text = Texts.save; save.Click += delegate { var existing = SupportFragmentManager.FindFragmentByTag(SAVE_MENU_TAG); saveFragment.Show(SupportFragmentManager, SAVE_MENU_TAG); }; }