Add support for predictive back navigation

mastodon/build.gradle

@@ -90,7 +90,7 @@ dependencies {
 	implementation 'me.grishka.litex:viewpager:1.0.0'
 	implementation 'me.grishka.litex:viewpager2:1.0.0'
 	implementation 'me.grishka.litex:palette:1.0.0'
-	implementation 'me.grishka.appkit:appkit:1.2.17'
+	implementation 'me.grishka.appkit:appkit:1.3.0'
 	implementation 'com.google.code.gson:gson:2.8.9'
 	implementation 'org.jsoup:jsoup:1.14.3'
 	implementation 'com.squareup:otto:1.3.8'

mastodon/src/main/AndroidManifest.xml

@@ -33,7 +33,8 @@
 		android:supportsRtl="true"
 		android:icon="@mipmap/ic_launcher"
 		android:theme="@style/Theme.Mastodon.AutoLightDark"
-		android:largeHeap="true">
+		android:largeHeap="true"
+		android:enableOnBackInvokedCallback="true">
 
 		<meta-data
 			android:name="com.google.mlkit.vision.DEPENDENCIES"

mastodon/src/main/java/org/joinmastodon/android/fragments/ComposeFragment.java

@@ -102,13 +102,12 @@ import me.grishka.appkit.Nav;
 import me.grishka.appkit.api.Callback;
 import me.grishka.appkit.api.ErrorResponse;
 import me.grishka.appkit.fragments.CustomTransitionsFragment;
-import me.grishka.appkit.fragments.OnBackPressedListener;
 import me.grishka.appkit.imageloader.ViewImageLoader;
 import me.grishka.appkit.imageloader.requests.UrlImageLoaderRequest;
 import me.grishka.appkit.utils.CubicBezierInterpolator;
 import me.grishka.appkit.utils.V;
 
-public class ComposeFragment extends MastodonToolbarFragment implements OnBackPressedListener, ComposeEditText.SelectionListener, CustomTransitionsFragment{
+public class ComposeFragment extends MastodonToolbarFragment implements ComposeEditText.SelectionListener, CustomTransitionsFragment{
 
 	private static final int MEDIA_RESULT=717;
 	public static final int IMAGE_DESCRIPTION_RESULT=363;
@@ -173,6 +172,11 @@ public class ComposeFragment extends MastodonToolbarFragment implements OnBackPr
 	private BackgroundColorSpan overLimitBG;
 	private ForegroundColorSpan overLimitFG;
 
+	private Runnable emojiKeyboardHider;
+	private Runnable sendingBackButtonBlocker;
+	private Runnable discardConfirmationCallback=this::confirmDiscardDraftAndFinish;
+	private boolean prevHadDraft;
+
 	public ComposeFragment(){
 		super(R.layout.toolbar_fragment_with_progressbar);
 	}
@@ -249,6 +253,7 @@ public class ComposeFragment extends MastodonToolbarFragment implements OnBackPr
 				getActivity().dispatchKeyEvent(new KeyEvent(KeyEvent.ACTION_UP, KeyEvent.KEYCODE_DEL));
 			}
 		});
+		emojiKeyboardHider=emojiKeyboard::hide;
 
 		View view=inflater.inflate(R.layout.fragment_compose, container, false);
 		mainLayout=view.findViewById(R.id.compose_main_ll);
@@ -305,6 +310,10 @@ public class ComposeFragment extends MastodonToolbarFragment implements OnBackPr
 			public void onIconChanged(int icon){
 				emojiBtn.setSelected(icon!=PopupKeyboard.ICON_HIDDEN);
 				updateNavigationBarColor(icon!=PopupKeyboard.ICON_HIDDEN);
+				if(icon!=PopupKeyboard.ICON_HIDDEN)
+					addBackCallback(emojiKeyboardHider);
+				else
+					removeBackCallback(emojiKeyboardHider);
 				if(autocompleteViewController.getMode()==ComposeAutocompleteViewController.Mode.EMOJIS){
 					contentView.layout(contentView.getLeft(), contentView.getTop(), contentView.getRight(), contentView.getBottom());
 					if(icon==PopupKeyboard.ICON_HIDDEN)
@@ -480,6 +489,7 @@ public class ComposeFragment extends MastodonToolbarFragment implements OnBackPr
 				}
 
 				updateCharCounter();
+				updateDraftState();
 			}
 		});
 		spoilerEdit.addTextChangedListener(new SimpleTextWatcher(e->updateCharCounter()));
@@ -621,6 +631,7 @@ public class ComposeFragment extends MastodonToolbarFragment implements OnBackPr
 		if(publishButton==null)
 			return;
 		publishButton.setEnabled((trimmedCharCount>0 || !mediaViewController.isEmpty()) && charCount<=charLimit && mediaViewController.getNonDoneAttachmentCount()==0 && (pollViewController.isEmpty() || pollViewController.getNonEmptyOptionsCount()>1));
+		updateDraftState();
 	}
 
 	private void onCustomEmojiClick(Emoji emoji){
@@ -696,6 +707,7 @@ public class ComposeFragment extends MastodonToolbarFragment implements OnBackPr
 		overlayParams.softInputMode=WindowManager.LayoutParams.SOFT_INPUT_STATE_UNCHANGED;
 		overlayParams.token=mainEditText.getWindowToken();
 		wm.addView(sendingOverlay, overlayParams);
+		addBackCallback(sendingBackButtonBlocker);
 
 		publishButton.setEnabled(false);
 		V.setVisibilityAnimated(sendProgress, View.VISIBLE);
@@ -737,6 +749,7 @@ public class ComposeFragment extends MastodonToolbarFragment implements OnBackPr
 			public void onSuccess(Status result){
 				wm.removeView(sendingOverlay);
 				sendingOverlay=null;
+				removeBackCallback(sendingBackButtonBlocker);
 				if(editingStatus==null){
 					E.post(new StatusCreatedEvent(result, accountID));
 					if(replyTo!=null){
@@ -769,6 +782,7 @@ public class ComposeFragment extends MastodonToolbarFragment implements OnBackPr
 	private void handlePublishError(ErrorResponse error){
 		wm.removeView(sendingOverlay);
 		sendingOverlay=null;
+		removeBackCallback(sendingBackButtonBlocker);
 		V.setVisibilityAnimated(sendProgress, View.GONE);
 		publishButton.setEnabled(true);
 		if(error instanceof MastodonErrorResponse me){
@@ -796,19 +810,16 @@ public class ComposeFragment extends MastodonToolbarFragment implements OnBackPr
 		return (mainEditText.length()>0 && !mainEditText.getText().toString().equals(initialText)) || !mediaViewController.isEmpty() || pollFieldsHaveContent;
 	}
 
-	@Override
+	private void updateDraftState(){
-	public boolean onBackPressed(){
+		boolean hasDraft=hasDraft();
-		if(emojiKeyboard.isVisible()){
+		if(hasDraft!=prevHadDraft){
-			emojiKeyboard.hide();
+			prevHadDraft=hasDraft;
-			return true;
+			if(hasDraft){
+				addBackCallback(discardConfirmationCallback);
+			}else{
+				removeBackCallback(discardConfirmationCallback);
+			}
 		}
-		if(hasDraft()){
-			confirmDiscardDraftAndFinish();
-			return true;
-		}
-		if(sendingOverlay!=null)
-			return true;
-		return false;
 	}
 
 	@Override
@@ -842,7 +853,10 @@ public class ComposeFragment extends MastodonToolbarFragment implements OnBackPr
 	private void confirmDiscardDraftAndFinish(){
 		new M3AlertDialogBuilder(getActivity())
 				.setTitle(editingStatus==null ? R.string.discard_draft : R.string.discard_changes)
-				.setPositiveButton(R.string.discard, (dialog, which)->Nav.finish(this))
+				.setPositiveButton(R.string.discard, (dialog, which)->{
+					removeBackCallback(discardConfirmationCallback);
+					Nav.finish(this);
+				})
 				.setNegativeButton(R.string.cancel, null)
 				.show();
 	}

mastodon/src/main/java/org/joinmastodon/android/fragments/ComposeImageDescriptionFragment.java

@@ -32,12 +32,11 @@ import java.util.Collections;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
-import me.grishka.appkit.fragments.OnBackPressedListener;
 import me.grishka.appkit.imageloader.ViewImageLoader;
 import me.grishka.appkit.imageloader.requests.UrlImageLoaderRequest;
 import me.grishka.appkit.utils.V;
 
-public class ComposeImageDescriptionFragment extends MastodonToolbarFragment implements OnBackPressedListener{
+public class ComposeImageDescriptionFragment extends MastodonToolbarFragment{
 	private static final String TAG="ComposeImageDescription";
 
 	private String accountID, attachmentID;
@@ -138,9 +137,9 @@ public class ComposeImageDescriptionFragment extends MastodonToolbarFragment imp
 	}
 
 	@Override
-	public boolean onBackPressed(){
+	public void onStop(){
+		super.onStop();
 		deliverResult();
-		return false;
 	}
 
 	@Override

mastodon/src/main/java/org/joinmastodon/android/fragments/CreateListAddMembersFragment.java

@@ -42,13 +42,11 @@ import me.grishka.appkit.Nav;
 import me.grishka.appkit.api.Callback;
 import me.grishka.appkit.api.ErrorResponse;
 import me.grishka.appkit.api.SimpleCallback;
-import me.grishka.appkit.fragments.OnBackPressedListener;
-import me.grishka.appkit.fragments.WindowInsetsAwareFragment;
 import me.grishka.appkit.utils.CubicBezierInterpolator;
 import me.grishka.appkit.utils.V;
 import me.grishka.appkit.views.FragmentRootLinearLayout;
 
-public class CreateListAddMembersFragment extends BaseAccountListFragment implements OnBackPressedListener, AddNewListMembersFragment.Listener{
+public class CreateListAddMembersFragment extends BaseAccountListFragment implements AddNewListMembersFragment.Listener{
 	private FollowList followList;
 	private Button nextButton;
 	private View buttonBar;
@@ -59,6 +57,7 @@ public class CreateListAddMembersFragment extends BaseAccountListFragment implem
 	private WindowInsets lastInsets;
 	private boolean dismissingSearchFragment;
 	private HashSet<String> accountIDsInList=new HashSet<>();
+	private Runnable searchFragmentDismisser=this::dismissSearchFragment;
 
 	@Override
 	public void onCreate(Bundle savedInstanceState){
@@ -156,6 +155,7 @@ public class CreateListAddMembersFragment extends BaseAccountListFragment implem
 		searchFragmentContainer.animate().translationX(0).alpha(1).setDuration(300).withLayer().setInterpolator(CubicBezierInterpolator.DEFAULT).withEndAction(()->{
 			rootView.setVisibility(View.GONE);
 		}).start();
+		addBackCallback(searchFragmentDismisser);
 		return true;
 	}
 
@@ -183,6 +183,7 @@ public class CreateListAddMembersFragment extends BaseAccountListFragment implem
 	private void dismissSearchFragment(){
 		if(searchFragment==null || dismissingSearchFragment)
 			return;
+		removeBackCallback(searchFragmentDismisser);
 		dismissingSearchFragment=true;
 		rootView.setVisibility(View.VISIBLE);
 		searchFragmentContainer.animate().translationX(V.dp(100)).alpha(0).setDuration(200).withLayer().setInterpolator(CubicBezierInterpolator.DEFAULT).withEndAction(()->{
@@ -201,15 +202,6 @@ public class CreateListAddMembersFragment extends BaseAccountListFragment implem
 		Nav.finish(this);
 	}
 
-	@Override
-	public boolean onBackPressed(){
-		if(searchFragment!=null){
-			dismissSearchFragment();
-			return true;
-		}
-		return false;
-	}
-
 	@Override
 	public boolean isAccountInList(AccountViewModel account){
 		return accountIDsInList.contains(account.account.id);

mastodon/src/main/java/org/joinmastodon/android/fragments/HomeFragment.java

@@ -30,8 +30,8 @@ import org.joinmastodon.android.fragments.onboarding.OnboardingFollowSuggestions
 import org.joinmastodon.android.model.Account;
 import org.joinmastodon.android.model.Notification;
 import org.joinmastodon.android.model.PaginatedResponse;
-import org.joinmastodon.android.ui.sheets.AccountSwitcherSheet;
 import org.joinmastodon.android.ui.OutlineProviders;
+import org.joinmastodon.android.ui.sheets.AccountSwitcherSheet;
 import org.joinmastodon.android.ui.utils.UiUtils;
 import org.joinmastodon.android.ui.views.TabBar;
 import org.joinmastodon.android.utils.ObjectIdComparator;
@@ -48,13 +48,12 @@ import me.grishka.appkit.api.Callback;
 import me.grishka.appkit.api.ErrorResponse;
 import me.grishka.appkit.fragments.AppKitFragment;
 import me.grishka.appkit.fragments.LoaderFragment;
-import me.grishka.appkit.fragments.OnBackPressedListener;
 import me.grishka.appkit.imageloader.ViewImageLoader;
 import me.grishka.appkit.imageloader.requests.UrlImageLoaderRequest;
 import me.grishka.appkit.utils.V;
 import me.grishka.appkit.views.FragmentRootLinearLayout;
 
-public class HomeFragment extends AppKitFragment implements OnBackPressedListener{
+public class HomeFragment extends AppKitFragment{
 	private FragmentRootLinearLayout content;
 	private HomeTimelineFragment homeTimelineFragment;
 	private NotificationsListFragment notificationsFragment;
@@ -272,15 +271,6 @@ public class HomeFragment extends AppKitFragment implements OnBackPressedListene
 		return false;
 	}
 
-	@Override
-	public boolean onBackPressed(){
-		if(currentTab==R.id.tab_profile)
-			return profileFragment.onBackPressed();
-		if(currentTab==R.id.tab_search)
-			return searchFragment.onBackPressed();
-		return false;
-	}
-
 	@Override
 	public void onSaveInstanceState(Bundle outState){
 		super.onSaveInstanceState(outState);

mastodon/src/main/java/org/joinmastodon/android/fragments/ListMembersFragment.java

@@ -44,12 +44,11 @@ import java.util.stream.Collectors;
 import me.grishka.appkit.Nav;
 import me.grishka.appkit.api.Callback;
 import me.grishka.appkit.api.ErrorResponse;
-import me.grishka.appkit.fragments.OnBackPressedListener;
 import me.grishka.appkit.utils.CubicBezierInterpolator;
 import me.grishka.appkit.utils.V;
 import me.grishka.appkit.views.FragmentRootLinearLayout;
 
-public class ListMembersFragment extends PaginatedAccountListFragment implements AddNewListMembersFragment.Listener, OnBackPressedListener{
+public class ListMembersFragment extends PaginatedAccountListFragment implements AddNewListMembersFragment.Listener{
 	private ImageButton fab;
 	private FollowList followList;
 	private boolean inSelectionMode;
@@ -63,6 +62,8 @@ public class ListMembersFragment extends PaginatedAccountListFragment implements
 	private WindowInsets lastInsets;
 	private HashSet<String> accountIDsInList=new HashSet<>();
 	private boolean dismissingSearchFragment;
+	private Runnable searchFragmentDismisser=this::dismissSearchFragment;;
+	private Runnable actionModeDismisser=()->actionMode.finish();
 
 	public ListMembersFragment(){
 		setListLayoutId(R.layout.recycler_fragment_with_fab);
@@ -214,6 +215,7 @@ public class ListMembersFragment extends PaginatedAccountListFragment implements
 		searchFragmentContainer.animate().translationX(0).alpha(1).setDuration(300).withLayer().setInterpolator(CubicBezierInterpolator.DEFAULT).withEndAction(()->{
 			rootView.setVisibility(View.GONE);
 		}).start();
+		addBackCallback(searchFragmentDismisser);
 	}
 
 	private void onItemClick(AccountViewHolder holder){
@@ -293,9 +295,11 @@ public class ListMembersFragment extends PaginatedAccountListFragment implements
 				selectedAccounts.clear();
 				updateItemsForSelectionModeTransition();
 				V.setVisibilityAnimated(fab, View.VISIBLE);
+				removeBackCallback(actionModeDismisser);
 			}
 		});
 		updateActionModeTitle();
+		addBackCallback(actionModeDismisser);
 	}
 
 	private void updateActionModeTitle(){
@@ -371,15 +375,6 @@ public class ListMembersFragment extends PaginatedAccountListFragment implements
 		removeAccounts(Set.of(account.account.id), onDone);
 	}
 
-	@Override
-	public boolean onBackPressed(){
-		if(searchFragment!=null){
-			dismissSearchFragment();
-			return true;
-		}
-		return false;
-	}
-
 	private void dismissSearchFragment(){
 		if(searchFragment==null || dismissingSearchFragment)
 			return;
@@ -393,6 +388,7 @@ public class ListMembersFragment extends PaginatedAccountListFragment implements
 			searchFragment=null;
 			dismissingSearchFragment=false;
 		}).start();
+		removeBackCallback(searchFragmentDismisser);
 		getActivity().getSystemService(InputMethodManager.class).hideSoftInputFromWindow(contentView.getWindowToken(), 0);
 	}
 

mastodon/src/main/java/org/joinmastodon/android/fragments/ProfileFragment.java

@@ -100,14 +100,13 @@ import me.grishka.appkit.api.ErrorResponse;
 import me.grishka.appkit.api.SimpleCallback;
 import me.grishka.appkit.fragments.BaseRecyclerFragment;
 import me.grishka.appkit.fragments.LoaderFragment;
-import me.grishka.appkit.fragments.OnBackPressedListener;
 import me.grishka.appkit.imageloader.ViewImageLoader;
 import me.grishka.appkit.imageloader.requests.UrlImageLoaderRequest;
 import me.grishka.appkit.utils.CubicBezierInterpolator;
 import me.grishka.appkit.utils.V;
 import me.grishka.appkit.views.FragmentRootLinearLayout;
 
-public class ProfileFragment extends LoaderFragment implements OnBackPressedListener, ScrollableToTop{
+public class ProfileFragment extends LoaderFragment implements ScrollableToTop{
 	private static final int AVATAR_RESULT=722;
 	private static final int COVER_RESULT=343;
 
@@ -158,6 +157,7 @@ public class ProfileFragment extends LoaderFragment implements OnBackPressedList
 	private Animator tabBarColorAnim;
 	private MenuItem editSaveMenuItem;
 	private boolean savingEdits;
+	private Runnable editModeBackCallback=this::onEditModeBackCallback;
 
 	@Override
 	public void onCreate(Bundle savedInstanceState){
@@ -983,12 +983,14 @@ public class ProfileFragment extends LoaderFragment implements OnBackPressedList
 		refreshLayout.setEnabled(false);
 		editDirty=false;
 		V.setVisibilityAnimated(fab, View.GONE);
+		addBackCallback(editModeBackCallback);
 	}
 
 	private void exitEditMode(){
 		if(!isInEditMode)
 			throw new IllegalStateException();
 		isInEditMode=false;
+		removeBackCallback(editModeBackCallback);
 
 		invalidateOptionsMenu();
 		actionButton.setText(R.string.edit_profile);
@@ -1098,23 +1100,18 @@ public class ProfileFragment extends LoaderFragment implements OnBackPressedList
 		updateRelationship();
 	}
 
-	@Override
+	private void onEditModeBackCallback(){
-	public boolean onBackPressed(){
+		if(savingEdits)
-		if(isInEditMode){
+			return;
-			if(savingEdits)
+		if(editDirty || aboutFragment.isEditDirty()){
-				return true;
+			new M3AlertDialogBuilder(getActivity())
-			if(editDirty || aboutFragment.isEditDirty()){
+					.setTitle(R.string.discard_changes)
-				new M3AlertDialogBuilder(getActivity())
+					.setPositiveButton(R.string.discard, (dlg, btn)->exitEditMode())
-						.setTitle(R.string.discard_changes)
+					.setNegativeButton(R.string.cancel, null)
-						.setPositiveButton(R.string.discard, (dlg, btn)->exitEditMode())
+					.show();
-						.setNegativeButton(R.string.cancel, null)
+		}else{
-						.show();
+			exitEditMode();
-			}else{
-				exitEditMode();
-			}
-			return true;
 		}
-		return false;
 	}
 
 	private List<Attachment> createFakeAttachments(String url, Drawable drawable){

mastodon/src/main/java/org/joinmastodon/android/fragments/ProfileQrCodeFragment.java

@@ -53,6 +53,8 @@ import android.widget.ImageView;
 import android.widget.LinearLayout;
 import android.widget.TextView;
 import android.widget.Toast;
+import android.window.OnBackInvokedCallback;
+import android.window.OnBackInvokedDispatcher;
 
 import com.google.zxing.BarcodeFormat;
 import com.google.zxing.EncodeHintType;
@@ -144,12 +146,16 @@ public class ProfileQrCodeFragment extends AppKitFragment{
 		if(!isTablet){
 			getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
 		}
-		dlg.setOnKeyListener((dialog, keyCode, event)->{
+		if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.TIRAMISU){
-			if(keyCode==KeyEvent.KEYCODE_BACK && event.getAction()==KeyEvent.ACTION_DOWN){
+			dlg.getOnBackInvokedDispatcher().registerOnBackInvokedCallback(OnBackInvokedDispatcher.PRIORITY_DEFAULT, this::dismiss);
-				dismiss();
+		}else{
-			}
+			dlg.setOnKeyListener((dialog, keyCode, event)->{
-			return true;
+				if(keyCode==KeyEvent.KEYCODE_BACK && event.getAction()==KeyEvent.ACTION_DOWN){
-		});
+					dismiss();
+				}
+				return true;
+			});
+		}
 	}
 
 	@Override

mastodon/src/main/java/org/joinmastodon/android/fragments/discover/DiscoverFragment.java

@@ -36,10 +36,9 @@ import androidx.viewpager2.widget.ViewPager2;
 import me.grishka.appkit.Nav;
 import me.grishka.appkit.fragments.AppKitFragment;
 import me.grishka.appkit.fragments.BaseRecyclerFragment;
-import me.grishka.appkit.fragments.OnBackPressedListener;
 import me.grishka.appkit.utils.V;
 
-public class DiscoverFragment extends AppKitFragment implements ScrollableToTop, OnBackPressedListener{
+public class DiscoverFragment extends AppKitFragment implements ScrollableToTop{
 	private static final int QUERY_RESULT=937;
 	private static final int SCAN_RESULT=456;
 
@@ -62,6 +61,7 @@ public class DiscoverFragment extends AppKitFragment implements ScrollableToTop,
 	private String accountID;
 	private String currentQuery;
 	private Intent scannerIntent;
+	private Runnable searchExitCallback=this::exitSearch;
 
 	@Override
 	public void onCreate(Bundle savedInstanceState){
@@ -232,6 +232,7 @@ public class DiscoverFragment extends AppKitFragment implements ScrollableToTop,
 			searchBack.setEnabled(true);
 			searchBack.setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_YES);
 			tabsDivider.setVisibility(View.GONE);
+			addBackCallback(searchExitCallback);
 		}
 	}
 
@@ -248,6 +249,7 @@ public class DiscoverFragment extends AppKitFragment implements ScrollableToTop,
 		searchBack.setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_NO);
 		tabsDivider.setVisibility(View.VISIBLE);
 		currentQuery=null;
+		removeBackCallback(searchExitCallback);
 	}
 
 	private Fragment getFragmentForPage(int page){
@@ -260,15 +262,6 @@ public class DiscoverFragment extends AppKitFragment implements ScrollableToTop,
 		};
 	}
 
-	@Override
-	public boolean onBackPressed(){
-		if(searchActive){
-			exitSearch();
-			return true;
-		}
-		return false;
-	}
-
 	@Override
 	public void onFragmentResult(int reqCode, boolean success, Bundle result){
 		if(reqCode==QUERY_RESULT && success){

mastodon/src/main/java/org/joinmastodon/android/fragments/discover/SearchQueryFragment.java

@@ -57,14 +57,13 @@ import androidx.recyclerview.widget.RecyclerView;
 import me.grishka.appkit.Nav;
 import me.grishka.appkit.api.SimpleCallback;
 import me.grishka.appkit.fragments.CustomTransitionsFragment;
-import me.grishka.appkit.fragments.OnBackPressedListener;
 import me.grishka.appkit.imageloader.ImageLoaderRecyclerAdapter;
 import me.grishka.appkit.imageloader.requests.ImageLoaderRequest;
 import me.grishka.appkit.utils.MergeRecyclerAdapter;
 import me.grishka.appkit.utils.V;
 import me.grishka.appkit.views.UsableRecyclerView;
 
-public class SearchQueryFragment extends MastodonRecyclerFragment<SearchResultViewModel> implements CustomTransitionsFragment, OnBackPressedListener{
+public class SearchQueryFragment extends MastodonRecyclerFragment<SearchResultViewModel> implements CustomTransitionsFragment{
 	private static final Pattern HASHTAG_REGEX=Pattern.compile("^(\\w*[a-zA-Z·]\\w*)$", Pattern.CASE_INSENSITIVE);
 	private static final Pattern USERNAME_REGEX=Pattern.compile("^@?([a-z0-9_-]+)(@[^\\s]+)?$", Pattern.CASE_INSENSITIVE);
 
@@ -371,6 +370,11 @@ public class SearchQueryFragment extends MastodonRecyclerFragment<SearchResultVi
 			container.invalidateOutline();
 			navigationIcon.invalidateSelf();
 		});
+		if(!enter){
+			String initialQuery=getArguments().getString("query");
+			searchViewHelper.setQuery(TextUtils.isEmpty(initialQuery) ? "" : initialQuery);
+			currentQuery=initialQuery;
+		}
 		return set;
 	}
 
@@ -437,14 +441,6 @@ public class SearchQueryFragment extends MastodonRecyclerFragment<SearchResultVi
 		Nav.finish(this);
 	}
 
-	@Override
-	public boolean onBackPressed(){
-		String initialQuery=getArguments().getString("query");
-		searchViewHelper.setQuery(TextUtils.isEmpty(initialQuery) ? "" : initialQuery);
-		currentQuery=initialQuery;
-		return false;
-	}
-
 	private static class AnimatableOutlineProvider extends ViewOutlineProvider{
 		private float boundsFraction, radius;
 		private final Rect boundsFrom, boundsTo;

mastodon/src/main/java/org/joinmastodon/android/fragments/onboarding/InstanceCatalogSignupFragment.java

@@ -58,12 +58,11 @@ import androidx.recyclerview.widget.RecyclerView;
 import me.grishka.appkit.Nav;
 import me.grishka.appkit.api.Callback;
 import me.grishka.appkit.api.ErrorResponse;
-import me.grishka.appkit.fragments.OnBackPressedListener;
 import me.grishka.appkit.utils.BindableViewHolder;
 import me.grishka.appkit.utils.V;
 import me.grishka.appkit.views.UsableRecyclerView;
 
-public class InstanceCatalogSignupFragment extends InstanceCatalogFragment implements OnBackPressedListener{
+public class InstanceCatalogSignupFragment extends InstanceCatalogFragment{
 	private View topBar;
 
 	private List<String> languages=Collections.emptyList();
@@ -84,6 +83,8 @@ public class InstanceCatalogSignupFragment extends InstanceCatalogFragment imple
 	private String inviteCode, inviteCodeHost;
 	private AlertDialog currentInviteLinkAlert;
 
+	private Runnable exitQueryModeCallback=()->setSearchQueryMode(false);
+
 	public InstanceCatalogSignupFragment(){
 		super(R.layout.fragment_onboarding_common, 10);
 	}
@@ -582,19 +583,13 @@ public class InstanceCatalogSignupFragment extends InstanceCatalogFragment imple
 		super.onApplyWindowInsets(insets.replaceSystemWindowInsets(insets.getSystemWindowInsetLeft(), 0, insets.getSystemWindowInsetRight(), insets.getSystemWindowInsetBottom()));
 	}
 
-	@Override
-	public boolean onBackPressed(){
-		if(searchQueryMode){
-			setSearchQueryMode(false);
-			return true;
-		}
-		return false;
-	}
-
 	private void setSearchQueryMode(boolean enabled){
+		if(searchQueryMode==enabled)
+			return;
 		searchQueryMode=enabled;
 		RelativeLayout.LayoutParams lp=(RelativeLayout.LayoutParams) searchEdit.getLayoutParams();
 		if(searchQueryMode){
+			addBackCallback(exitQueryModeCallback);
 			filtersScroll.setVisibility(View.GONE);
 			lp.removeRule(RelativeLayout.END_OF);
 			backBtn.setScaleX(0.83333333f);
@@ -602,6 +597,7 @@ public class InstanceCatalogSignupFragment extends InstanceCatalogFragment imple
 			backBtn.setTranslationX(V.dp(8));
 			searchEdit.setCompoundDrawableTintList(ColorStateList.valueOf(0));
 		}else{
+			removeBackCallback(exitQueryModeCallback);
 			filtersScroll.setVisibility(View.VISIBLE);
 			focusThing.requestFocus();
 			searchEdit.setText("");

mastodon/src/main/java/org/joinmastodon/android/fragments/settings/EditFilterFragment.java

@@ -24,6 +24,7 @@ import org.joinmastodon.android.model.FilterKeyword;
 import org.joinmastodon.android.model.viewmodel.CheckableListItem;
 import org.joinmastodon.android.model.viewmodel.ListItem;
 import org.joinmastodon.android.ui.M3AlertDialogBuilder;
+import org.joinmastodon.android.ui.utils.SimpleTextWatcher;
 import org.joinmastodon.android.ui.utils.UiUtils;
 import org.joinmastodon.android.ui.views.FloatingHintEditTextLayout;
 import org.parceler.Parcels;
@@ -44,11 +45,10 @@ import androidx.recyclerview.widget.RecyclerView;
 import me.grishka.appkit.Nav;
 import me.grishka.appkit.api.Callback;
 import me.grishka.appkit.api.ErrorResponse;
-import me.grishka.appkit.fragments.OnBackPressedListener;
 import me.grishka.appkit.utils.MergeRecyclerAdapter;
 import me.grishka.appkit.utils.SingleViewRecyclerAdapter;
 
-public class EditFilterFragment extends BaseSettingsFragment<Void> implements OnBackPressedListener{
+public class EditFilterFragment extends BaseSettingsFragment<Void>{
 	private static final int WORDS_RESULT=370;
 	private static final int CONTEXT_RESULT=651;
 
@@ -63,6 +63,13 @@ public class EditFilterFragment extends BaseSettingsFragment<Void> implements On
 	private ArrayList<String> deletedWordIDs=new ArrayList<>();
 	private EnumSet<FilterContext> context=EnumSet.allOf(FilterContext.class);
 	private boolean dirty;
+	private boolean wasDirty;
+
+	private Runnable confirmCallback=()->{
+		if(isDirty()){
+			UiUtils.showConfirmationAlert(getActivity(), R.string.discard_changes, 0, R.string.discard, ()->Nav.finish(this));
+		}
+	};
 
 	@Override
 	public void onCreate(Bundle savedInstanceState){
@@ -101,6 +108,7 @@ public class EditFilterFragment extends BaseSettingsFragment<Void> implements On
 		titleEditLayout.updateHint();
 		if(filter!=null)
 			titleEdit.setText(filter.title);
+		titleEdit.addTextChangedListener(new SimpleTextWatcher(e->updateBackCallback()));
 
 		MergeRecyclerAdapter adapter=new MergeRecyclerAdapter();
 		adapter.addAdapter(new SingleViewRecyclerAdapter(titleEditLayout));
@@ -158,6 +166,7 @@ public class EditFilterFragment extends BaseSettingsFragment<Void> implements On
 						}
 						a.dismiss();
 					}
+					updateBackCallback();
 				})
 				.show();
 		alert.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(false);
@@ -309,6 +318,7 @@ public class EditFilterFragment extends BaseSettingsFragment<Void> implements On
 				}
 				deletedWordIDs.addAll(result.getStringArrayList("deleted"));
 			}
+			updateBackCallback();
 		}
 	}
 
@@ -317,11 +327,19 @@ public class EditFilterFragment extends BaseSettingsFragment<Void> implements On
 	}
 
 	@Override
-	public boolean onBackPressed(){
+	protected void toggleCheckableItem(ListItem<?> item){
-		if(isDirty()){
+		super.toggleCheckableItem(item);
-			UiUtils.showConfirmationAlert(getActivity(), R.string.discard_changes, 0, R.string.discard, ()->Nav.finish(this));
+		updateBackCallback();
-			return true;
+	}
+
+	private void updateBackCallback(){
+		boolean dirty=isDirty();
+		if(dirty!=wasDirty){
+			wasDirty=dirty;
+			if(dirty)
+				addBackCallback(confirmCallback);
+			else
+				removeBackCallback(confirmCallback);
 		}
-		return false;
 	}
 }

mastodon/src/main/java/org/joinmastodon/android/fragments/settings/FilterContextFragment.java

@@ -11,9 +11,7 @@ import java.util.Arrays;
 import java.util.EnumSet;
 import java.util.stream.Collectors;
 
-import me.grishka.appkit.fragments.OnBackPressedListener;
+public class FilterContextFragment extends BaseSettingsFragment<FilterContext>{
-
-public class FilterContextFragment extends BaseSettingsFragment<FilterContext> implements OnBackPressedListener{
 	private EnumSet<FilterContext> context;
 
 	@Override
@@ -33,7 +31,8 @@ public class FilterContextFragment extends BaseSettingsFragment<FilterContext> i
 	protected void doLoadData(int offset, int count){}
 
 	@Override
-	public boolean onBackPressed(){
+	public void onStop(){
+		super.onStop();
 		context=EnumSet.noneOf(FilterContext.class);
 		for(ListItem<FilterContext> item:data){
 			if(((CheckableListItem<FilterContext>) item).checked)
@@ -42,6 +41,5 @@ public class FilterContextFragment extends BaseSettingsFragment<FilterContext> i
 		Bundle args=new Bundle();
 		args.putSerializable("context", context);
 		setResult(true, args);
-		return false;
 	}
 }

mastodon/src/main/java/org/joinmastodon/android/fragments/settings/FilterWordsFragment.java

@@ -1,7 +1,6 @@
 package org.joinmastodon.android.fragments.settings;
 
 import android.app.AlertDialog;
-import android.os.Build;
 import android.os.Bundle;
 import android.os.Parcelable;
 import android.text.InputType;
@@ -11,11 +10,9 @@ import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
 import android.view.View;
-import android.view.ViewGroup;
 import android.view.WindowInsets;
 import android.widget.Button;
 import android.widget.EditText;
-import android.widget.ImageButton;
 
 import org.joinmastodon.android.R;
 import org.joinmastodon.android.model.FilterKeyword;
@@ -33,15 +30,15 @@ import java.util.Collections;
 import java.util.List;
 import java.util.stream.Collectors;
 
-import me.grishka.appkit.fragments.OnBackPressedListener;
 import me.grishka.appkit.utils.V;
 
-public class FilterWordsFragment extends BaseSettingsFragment<FilterKeyword> implements OnBackPressedListener{
+public class FilterWordsFragment extends BaseSettingsFragment<FilterKeyword>{
 	private Button fab;
 	private ActionMode actionMode;
 	private ArrayList<ListItem<FilterKeyword>> selectedItems=new ArrayList<>();
 	private ArrayList<String> deletedItemIDs=new ArrayList<>();
 	private MenuItem deleteItem;
+	private Runnable actionModeDismisser=()->actionMode.finish();
 
 	public FilterWordsFragment(){
 		setListLayoutId(R.layout.recycler_fragment_with_text_fab);
@@ -80,12 +77,12 @@ public class FilterWordsFragment extends BaseSettingsFragment<FilterKeyword> imp
 	}
 
 	@Override
-	public boolean onBackPressed(){
+	public void onStop(){
+		super.onStop();
 		Bundle result=new Bundle();
 		result.putParcelableArrayList("words", (ArrayList<? extends Parcelable>) data.stream().map(i->i.parentObject).map(Parcels::wrap).collect(Collectors.toCollection(ArrayList::new)));
 		result.putStringArrayList("deleted", deletedItemIDs);
 		setResult(true, result);
-		return false;
 	}
 
 	@Override
@@ -259,6 +256,7 @@ public class FilterWordsFragment extends BaseSettingsFragment<FilterKeyword> imp
 		}
 		itemsAdapter.notifyItemRangeChanged(0, data.size());
 		updateActionModeTitle();
+		addBackCallback(actionModeDismisser);
 	}
 
 	private void leaveSelectionMode(boolean fromActionMode){
@@ -280,6 +278,7 @@ public class FilterWordsFragment extends BaseSettingsFragment<FilterKeyword> imp
 			data.set(i, newItem);
 		}
 		itemsAdapter.notifyItemRangeChanged(0, data.size());
+		removeBackCallback(actionModeDismisser);
 	}
 
 	private void updateActionModeTitle(){

mastodon/src/main/java/org/joinmastodon/android/ui/photoviewer/PhotoViewer.java

@@ -54,6 +54,7 @@ import android.widget.SeekBar;
 import android.widget.TextView;
 import android.widget.Toast;
 import android.widget.Toolbar;
+import android.window.OnBackInvokedDispatcher;
 
 import org.joinmastodon.android.R;
 import org.joinmastodon.android.api.MastodonAPIController;
@@ -169,7 +170,7 @@ public class PhotoViewer implements ZoomPanView.Listener{
 		windowView=new FrameLayout(activity){
 			@Override
 			public boolean dispatchKeyEvent(KeyEvent event){
-				if(event.getKeyCode()==KeyEvent.KEYCODE_BACK){
+				if(Build.VERSION.SDK_INT<Build.VERSION_CODES.TIRAMISU && event.getKeyCode()==KeyEvent.KEYCODE_BACK){
 					if(event.getAction()==KeyEvent.ACTION_DOWN){
 						onStartSwipeToDismissTransition(0f);
 					}
@@ -257,6 +258,10 @@ public class PhotoViewer implements ZoomPanView.Listener{
 			wlp.layoutInDisplayCutoutMode=Build.VERSION.SDK_INT>=30 ? WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_ALWAYS : WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES;
 		windowView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
 		wm.addView(windowView, wlp);
+		if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.TIRAMISU){
+			// TODO make use of the progress callback for nicer animation
+			windowView.findOnBackInvokedDispatcher().registerOnBackInvokedCallback(OnBackInvokedDispatcher.PRIORITY_DEFAULT, ()->onStartSwipeToDismissTransition(0));
+		}
 
 		windowView.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener(){
 			@Override

mastodon/src/main/java/org/joinmastodon/android/ui/viewcontrollers/ToolbarDropdownMenuController.java

@@ -10,6 +10,7 @@ import android.content.Context;
 import android.content.res.Resources;
 import android.graphics.PixelFormat;
 import android.graphics.Rect;
+import android.os.Build;
 import android.view.Gravity;
 import android.view.KeyEvent;
 import android.view.MotionEvent;
@@ -19,6 +20,7 @@ import android.view.ViewTreeObserver;
 import android.view.WindowManager;
 import android.widget.FrameLayout;
 import android.widget.Toolbar;
+import android.window.OnBackInvokedDispatcher;
 
 import org.joinmastodon.android.R;
 import org.joinmastodon.android.ui.OutlineProviders;
@@ -83,6 +85,15 @@ public class ToolbarDropdownMenuController{
 				.withLayer()
 				.start();
 		controllerStack.add(initialSubmenu);
+
+		if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.TIRAMISU){
+			windowView.findOnBackInvokedDispatcher().registerOnBackInvokedCallback(OnBackInvokedDispatcher.PRIORITY_DEFAULT, ()->{
+				if(controllerStack.size()>1)
+					popSubmenuController();
+				else
+					dismiss();
+			});
+		}
 	}
 
 	public void dismiss(){
@@ -243,7 +254,7 @@ public class ToolbarDropdownMenuController{
 
 		@Override
 		public boolean dispatchKeyEvent(KeyEvent event){
-			if(event.getKeyCode()==KeyEvent.KEYCODE_BACK){
+			if(Build.VERSION.SDK_INT<Build.VERSION_CODES.TIRAMISU && event.getKeyCode()==KeyEvent.KEYCODE_BACK){
 				if(event.getAction()==KeyEvent.ACTION_DOWN){
 					if(controllerStack.size()>1)
 						popSubmenuController();