Add support for the predictive back gesture

app/src/main/AndroidManifest.xml

@@ -24,6 +24,7 @@
 		android:allowBackup="true"
 		android:backupAgent="org.koitharu.kotatsu.settings.backup.AppBackupAgent"
 		android:dataExtractionRules="@xml/backup_rules"
+		android:enableOnBackInvokedCallback="true"
 		android:fullBackupContent="@xml/backup_content"
 		android:fullBackupOnly="true"
 		android:icon="@mipmap/ic_launcher"

app/src/main/java/org/koitharu/kotatsu/base/ui/AlertDialogFragment.kt

@@ -5,6 +5,7 @@ import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.ViewGroup
 import androidx.annotation.CallSuper
+import androidx.appcompat.app.AlertDialog
 import androidx.fragment.app.DialogFragment
 import androidx.viewbinding.ViewBinding
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
@@ -39,6 +40,8 @@ abstract class AlertDialogFragment<B : ViewBinding> : DialogFragment() {
 
 	open fun onBuildDialog(builder: MaterialAlertDialogBuilder): MaterialAlertDialogBuilder = builder
 
+	open fun onDialogCreated(dialog: AlertDialog) = Unit
+
 	protected fun bindingOrNull(): B? = viewBinding
 
 	protected abstract fun onInflateView(inflater: LayoutInflater, container: ViewGroup?): B

app/src/main/java/org/koitharu/kotatsu/base/ui/BaseActivity.kt

@@ -82,6 +82,7 @@ abstract class BaseActivity<B : ViewBinding> :
 	}
 
 	override fun onOptionsItemSelected(item: MenuItem) = if (item.itemId == android.R.id.home) {
+		@Suppress("DEPRECATION")
 		onBackPressed()
 		true
 	} else super.onOptionsItemSelected(item)
@@ -130,7 +131,8 @@ abstract class BaseActivity<B : ViewBinding> :
 		window.statusBarColor = getThemeColor(android.R.attr.statusBarColor)
 	}
 
-	@Suppress("OVERRIDE_DEPRECATION", "DEPRECATION")
+	@Suppress("DEPRECATION", "DeprecatedCallableAddReplaceWith")
+	@Deprecated("Should not be used")
 	override fun onBackPressed() {
 		if ( // https://issuetracker.google.com/issues/139738913
 			Build.VERSION.SDK_INT == Build.VERSION_CODES.Q &&

app/src/main/java/org/koitharu/kotatsu/base/ui/BaseBottomSheet.kt

@@ -7,6 +7,7 @@ import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import android.view.ViewGroup.LayoutParams
+import androidx.activity.OnBackPressedDispatcher
 import androidx.core.view.updateLayoutParams
 import androidx.viewbinding.ViewBinding
 import com.google.android.material.bottomsheet.BottomSheetBehavior
@@ -30,6 +31,9 @@ abstract class BaseBottomSheet<B : ViewBinding> : BottomSheetDialogFragment() {
 	val isExpanded: Boolean
 		get() = behavior?.state == BottomSheetBehavior.STATE_EXPANDED
 
+	val onBackPressedDispatcher: OnBackPressedDispatcher
+		get() = (requireDialog() as AppBottomSheetDialog).onBackPressedDispatcher
+
 	final override fun onCreateView(
 		inflater: LayoutInflater,
 		container: ViewGroup?,

app/src/main/java/org/koitharu/kotatsu/base/ui/util/CollapseActionViewCallback.kt

@@ -0,0 +1,24 @@
+package org.koitharu.kotatsu.base.ui.util
+
+import android.view.MenuItem
+import android.view.MenuItem.OnActionExpandListener
+import androidx.activity.OnBackPressedCallback
+
+class CollapseActionViewCallback(
+	private val menuItem: MenuItem
+) : OnBackPressedCallback(menuItem.isActionViewExpanded), OnActionExpandListener {
+
+	override fun handleOnBackPressed() {
+		menuItem.collapseActionView()
+	}
+
+	override fun onMenuItemActionExpand(item: MenuItem): Boolean {
+		isEnabled = true
+		return true
+	}
+
+	override fun onMenuItemActionCollapse(item: MenuItem): Boolean {
+		isEnabled = false
+		return true
+	}
+}

app/src/main/java/org/koitharu/kotatsu/browser/BrowserActivity.kt

@@ -20,6 +20,8 @@ import com.google.android.material.R as materialR
 @SuppressLint("SetJavaScriptEnabled")
 class BrowserActivity : BaseActivity<ActivityBrowserBinding>(), BrowserCallback {
 
+	private lateinit var onBackPressedCallback: WebViewBackPressedCallback
+
 	override fun onCreate(savedInstanceState: Bundle?) {
 		super.onCreate(savedInstanceState)
 		setContentView(ActivityBrowserBinding.inflate(layoutInflater))
@@ -33,6 +35,8 @@ class BrowserActivity : BaseActivity<ActivityBrowserBinding>(), BrowserCallback
 		}
 		binding.webView.webViewClient = BrowserClient(this)
 		binding.webView.webChromeClient = ProgressChromeClient(binding.progressBar)
+		onBackPressedCallback = WebViewBackPressedCallback(binding.webView)
+		onBackPressedDispatcher.addCallback(onBackPressedCallback)
 		if (savedInstanceState != null) {
 			return
 		}
@@ -84,14 +88,6 @@ class BrowserActivity : BaseActivity<ActivityBrowserBinding>(), BrowserCallback
 		else -> super.onOptionsItemSelected(item)
 	}
 
-	override fun onBackPressed() {
-		if (binding.webView.canGoBack()) {
-			binding.webView.goBack()
-		} else {
-			super.onBackPressed()
-		}
-	}
-
 	override fun onPause() {
 		binding.webView.onPause()
 		super.onPause()
@@ -116,6 +112,10 @@ class BrowserActivity : BaseActivity<ActivityBrowserBinding>(), BrowserCallback
 		supportActionBar?.subtitle = subtitle
 	}
 
+	override fun onHistoryChanged() {
+		onBackPressedCallback.onHistoryChanged()
+	}
+
 	override fun onWindowInsetsChanged(insets: Insets) {
 		binding.appbar.updatePadding(
 			top = insets.top,

app/src/main/java/org/koitharu/kotatsu/browser/BrowserCallback.kt

@@ -1,8 +1,8 @@
 package org.koitharu.kotatsu.browser
 
-interface BrowserCallback {
+interface BrowserCallback : OnHistoryChangedListener {
 
 	fun onLoadingStateChanged(isLoading: Boolean)
 
 	fun onTitleChanged(title: CharSequence, subtitle: CharSequence?)
-}
+}

app/src/main/java/org/koitharu/kotatsu/browser/BrowserClient.kt

@@ -4,7 +4,7 @@ import android.graphics.Bitmap
 import android.webkit.WebView
 import android.webkit.WebViewClient
 
-class BrowserClient(private val callback: BrowserCallback) : WebViewClient() {
+open class BrowserClient(private val callback: BrowserCallback) : WebViewClient() {
 
 	override fun onPageFinished(webView: WebView, url: String) {
 		super.onPageFinished(webView, url)
@@ -20,4 +20,9 @@ class BrowserClient(private val callback: BrowserCallback) : WebViewClient() {
 		super.onPageCommitVisible(view, url)
 		callback.onTitleChanged(view.title.orEmpty(), url)
 	}
-}
+
+	override fun doUpdateVisitedHistory(view: WebView?, url: String?, isReload: Boolean) {
+		super.doUpdateVisitedHistory(view, url, isReload)
+		callback.onHistoryChanged()
+	}
+}

app/src/main/java/org/koitharu/kotatsu/browser/OnHistoryChangedListener.kt

@@ -0,0 +1,6 @@
+package org.koitharu.kotatsu.browser
+
+fun interface OnHistoryChangedListener {
+
+	fun onHistoryChanged()
+}

app/src/main/java/org/koitharu/kotatsu/browser/WebViewBackPressedCallback.kt

@@ -0,0 +1,21 @@
+package org.koitharu.kotatsu.browser
+
+import android.webkit.WebView
+import androidx.activity.OnBackPressedCallback
+
+class WebViewBackPressedCallback(
+	private val webView: WebView,
+) : OnBackPressedCallback(false), OnHistoryChangedListener {
+
+	init {
+		onHistoryChanged()
+	}
+
+	override fun handleOnBackPressed() {
+		webView.goBack()
+	}
+
+	override fun onHistoryChanged() {
+		isEnabled = webView.canGoBack()
+	}
+}

app/src/main/java/org/koitharu/kotatsu/browser/cloudflare/CloudFlareCallback.kt

@@ -1,8 +1,14 @@
 package org.koitharu.kotatsu.browser.cloudflare
 
-interface CloudFlareCallback {
+import org.koitharu.kotatsu.browser.BrowserCallback
+
+interface CloudFlareCallback : BrowserCallback {
+
+	override fun onLoadingStateChanged(isLoading: Boolean) = Unit
+
+	override fun onTitleChanged(title: CharSequence, subtitle: CharSequence?) = Unit
 
 	fun onPageLoaded()
 
 	fun onCheckPassed()
-}
+}

app/src/main/java/org/koitharu/kotatsu/browser/cloudflare/CloudFlareClient.kt

@@ -2,8 +2,8 @@ package org.koitharu.kotatsu.browser.cloudflare
 
 import android.graphics.Bitmap
 import android.webkit.WebView
-import android.webkit.WebViewClient
 import okhttp3.HttpUrl.Companion.toHttpUrl
+import org.koitharu.kotatsu.browser.BrowserClient
 import org.koitharu.kotatsu.core.network.cookies.MutableCookieJar
 
 private const val CF_CLEARANCE = "cf_clearance"
@@ -12,22 +12,22 @@ class CloudFlareClient(
 	private val cookieJar: MutableCookieJar,
 	private val callback: CloudFlareCallback,
 	private val targetUrl: String,
-) : WebViewClient() {
+) : BrowserClient(callback) {
 
 	private val oldClearance = getClearance()
 
-	override fun onPageStarted(view: WebView, url: String?, favicon: Bitmap?) {
+	override fun onPageStarted(view: WebView?, url: String?, favicon: Bitmap?) {
 		super.onPageStarted(view, url, favicon)
 		checkClearance()
 	}
 
-	override fun onPageCommitVisible(view: WebView?, url: String?) {
+	override fun onPageCommitVisible(view: WebView, url: String?) {
 		super.onPageCommitVisible(view, url)
 		callback.onPageLoaded()
 	}
 
-	override fun onPageFinished(view: WebView?, url: String?) {
-		super.onPageFinished(view, url)
+	override fun onPageFinished(webView: WebView, url: String) {
+		super.onPageFinished(webView, url)
 		callback.onPageLoaded()
 	}
 

app/src/main/java/org/koitharu/kotatsu/browser/cloudflare/CloudFlareDialog.kt

@@ -8,12 +8,14 @@ import android.view.View
 import android.view.ViewGroup
 import android.webkit.CookieManager
 import android.webkit.WebSettings
+import androidx.appcompat.app.AlertDialog
 import androidx.core.view.isInvisible
 import androidx.fragment.app.setFragmentResult
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import dagger.hilt.android.AndroidEntryPoint
 import okhttp3.Headers
 import org.koitharu.kotatsu.base.ui.AlertDialogFragment
+import org.koitharu.kotatsu.browser.WebViewBackPressedCallback
 import org.koitharu.kotatsu.core.network.CommonHeaders
 import org.koitharu.kotatsu.core.network.CommonHeadersInterceptor
 import org.koitharu.kotatsu.core.network.cookies.MutableCookieJar
@@ -31,6 +33,8 @@ class CloudFlareDialog : AlertDialogFragment<FragmentCloudflareBinding>(), Cloud
 	@Inject
 	lateinit var cookieJar: MutableCookieJar
 
+	private var onBackPressedCallback: WebViewBackPressedCallback? = null
+
 	override fun onInflateView(
 		inflater: LayoutInflater,
 		container: ViewGroup?,
@@ -58,6 +62,7 @@ class CloudFlareDialog : AlertDialogFragment<FragmentCloudflareBinding>(), Cloud
 	override fun onDestroyView() {
 		binding.webView.stopLoading()
 		binding.webView.destroy()
+		onBackPressedCallback = null
 		super.onDestroyView()
 	}
 
@@ -65,6 +70,13 @@ class CloudFlareDialog : AlertDialogFragment<FragmentCloudflareBinding>(), Cloud
 		return super.onBuildDialog(builder).setNegativeButton(android.R.string.cancel, null)
 	}
 
+	override fun onDialogCreated(dialog: AlertDialog) {
+		super.onDialogCreated(dialog)
+		onBackPressedCallback = WebViewBackPressedCallback(binding.webView).also {
+			dialog.onBackPressedDispatcher.addCallback(it)
+		}
+	}
+
 	override fun onResume() {
 		super.onResume()
 		binding.webView.onResume()
@@ -89,6 +101,10 @@ class CloudFlareDialog : AlertDialogFragment<FragmentCloudflareBinding>(), Cloud
 		dismissAllowingStateLoss()
 	}
 
+	override fun onHistoryChanged() {
+		onBackPressedCallback?.onHistoryChanged()
+	}
+
 	companion object {
 
 		const val TAG = "CloudFlareDialog"

app/src/main/java/org/koitharu/kotatsu/list/ui/filter/FilterBottomSheet.kt

@@ -1,34 +1,29 @@
 package org.koitharu.kotatsu.list.ui.filter
 
-import android.app.Dialog
-import android.content.DialogInterface
 import android.os.Bundle
-import android.view.*
+import android.view.LayoutInflater
+import android.view.MenuItem
+import android.view.View
+import android.view.ViewGroup
 import androidx.appcompat.widget.SearchView
 import androidx.fragment.app.FragmentManager
 import androidx.recyclerview.widget.AsyncListDiffer
 import androidx.recyclerview.widget.LinearLayoutManager
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.base.ui.BaseBottomSheet
+import org.koitharu.kotatsu.base.ui.util.CollapseActionViewCallback
 import org.koitharu.kotatsu.databinding.SheetFilterBinding
 import org.koitharu.kotatsu.remotelist.ui.RemoteListViewModel
-import org.koitharu.kotatsu.utils.ext.isScrolledToTop
 import org.koitharu.kotatsu.utils.ext.parentFragmentViewModels
 
 class FilterBottomSheet :
 	BaseBottomSheet<SheetFilterBinding>(),
 	MenuItem.OnActionExpandListener,
 	SearchView.OnQueryTextListener,
-	DialogInterface.OnKeyListener,
 	AsyncListDiffer.ListListener<FilterItem> {
 
 	private val viewModel by parentFragmentViewModels<RemoteListViewModel>()
-
-	override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
-		return super.onCreateDialog(savedInstanceState).also {
-			it.setOnKeyListener(this)
-		}
-	}
+	private var collapsibleActionViewCallback: CollapseActionViewCallback? = null
 
 	override fun onInflateView(inflater: LayoutInflater, container: ViewGroup?): SheetFilterBinding {
 		return SheetFilterBinding.inflate(inflater, container, false)
@@ -42,8 +37,14 @@ class FilterBottomSheet :
 		initOptionsMenu()
 	}
 
+	override fun onDestroyView() {
+		super.onDestroyView()
+		collapsibleActionViewCallback = null
+	}
+
 	override fun onMenuItemActionExpand(item: MenuItem): Boolean {
 		setExpanded(isExpanded = true, isLocked = true)
+		collapsibleActionViewCallback?.onMenuItemActionExpand(item)
 		return true
 	}
 
@@ -51,6 +52,7 @@ class FilterBottomSheet :
 		val searchView = (item.actionView as? SearchView) ?: return false
 		searchView.setQuery("", false)
 		searchView.post { setExpanded(isExpanded = false, isLocked = false) }
+		collapsibleActionViewCallback?.onMenuItemActionCollapse(item)
 		return true
 	}
 
@@ -61,19 +63,6 @@ class FilterBottomSheet :
 		return true
 	}
 
-	override fun onKey(dialog: DialogInterface?, keyCode: Int, event: KeyEvent?): Boolean {
-		if (keyCode == KeyEvent.KEYCODE_BACK) {
-			val menuItem = binding.headerBar.toolbar.menu.findItem(R.id.action_search) ?: return false
-			if (menuItem.isActionViewExpanded) {
-				if (event?.action == KeyEvent.ACTION_UP) {
-					menuItem.collapseActionView()
-				}
-				return true
-			}
-		}
-		return false
-	}
-
 	override fun onCurrentListChanged(previousList: MutableList<FilterItem>, currentList: MutableList<FilterItem>) {
 		if (currentList.size > previousList.size && view != null) {
 			(binding.recyclerView.layoutManager as LinearLayoutManager).scrollToPositionWithOffset(0, 0)
@@ -81,13 +70,16 @@ class FilterBottomSheet :
 	}
 
 	private fun initOptionsMenu() {
-		binding.headerBar.toolbar.inflateMenu(R.menu.opt_filter)
-		val searchMenuItem = binding.headerBar.toolbar.menu.findItem(R.id.action_search)
+		binding.headerBar.inflateMenu(R.menu.opt_filter)
+		val searchMenuItem = binding.headerBar.menu.findItem(R.id.action_search)
 		searchMenuItem.setOnActionExpandListener(this)
 		val searchView = searchMenuItem.actionView as SearchView
 		searchView.setOnQueryTextListener(this)
 		searchView.setIconifiedByDefault(false)
 		searchView.queryHint = searchMenuItem.title
+		collapsibleActionViewCallback = CollapseActionViewCallback(searchMenuItem).also {
+			onBackPressedDispatcher.addCallback(it)
+		}
 	}
 
 	companion object {

app/src/main/java/org/koitharu/kotatsu/main/ui/MainActivity.kt

@@ -7,6 +7,7 @@ import android.os.Bundle
 import android.util.SparseIntArray
 import android.view.MenuItem
 import android.view.View
+import androidx.activity.OnBackPressedCallback
 import androidx.activity.result.ActivityResultCallback
 import androidx.activity.viewModels
 import androidx.appcompat.view.ActionMode
@@ -84,6 +85,7 @@ class MainActivity :
 	private val viewModel by viewModels<MainViewModel>()
 	private val searchSuggestionViewModel by viewModels<SearchSuggestionViewModel>()
 	private val voiceInputLauncher = registerForActivityResult(VoiceInputContract(), VoiceInputCallback())
+	private val closeSearchCallback = CloseSearchCallback()
 	private lateinit var navigationDelegate: MainNavigationDelegate
 
 	override val appBar: AppBarLayout
@@ -121,8 +123,9 @@ class MainActivity :
 		navigationDelegate.addOnFragmentChangedListener(this)
 		navigationDelegate.onCreate(savedInstanceState)
 
-		onBackPressedDispatcher.addCallback(navigationDelegate)
 		onBackPressedDispatcher.addCallback(ExitCallback(this, binding.container))
+		onBackPressedDispatcher.addCallback(navigationDelegate)
+		onBackPressedDispatcher.addCallback(closeSearchCallback)
 
 		if (savedInstanceState == null) {
 			onFirstStart()
@@ -142,21 +145,6 @@ class MainActivity :
 		adjustSearchUI(isSearchOpened(), animate = false)
 	}
 
-	override fun onBackPressed() {
-		val fragment = supportFragmentManager.findFragmentByTag(TAG_SEARCH)
-		binding.searchView.clearFocus()
-		when {
-			fragment != null -> supportFragmentManager.commit {
-				setReorderingAllowed(true)
-				remove(fragment)
-				setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE)
-				runOnCommit { onSearchClosed() }
-			}
-
-			else -> super.onBackPressed()
-		}
-	}
-
 	override fun onFragmentChanged(fragment: Fragment, fromUser: Boolean) {
 		adjustFabVisibility(topFragment = fragment)
 		if (fromUser) {
@@ -300,11 +288,13 @@ class MainActivity :
 
 	private fun onSearchOpened() {
 		adjustSearchUI(isOpened = true, animate = true)
+		closeSearchCallback.isEnabled = true
 	}
 
 	private fun onSearchClosed() {
 		binding.searchView.hideKeyboard()
 		adjustSearchUI(isOpened = false, animate = true)
+		closeSearchCallback.isEnabled = false
 	}
 
 	private fun showNav(visible: Boolean) {
@@ -406,4 +396,23 @@ class MainActivity :
 			}
 		}
 	}
+
+	private inner class CloseSearchCallback : OnBackPressedCallback(false) {
+
+		override fun handleOnBackPressed() {
+			val fragment = supportFragmentManager.findFragmentByTag(TAG_SEARCH)
+			binding.searchView.clearFocus()
+			if (fragment == null) {
+				// this should not happen but who knows
+				isEnabled = false
+				return
+			}
+			supportFragmentManager.commit {
+				setReorderingAllowed(true)
+				remove(fragment)
+				setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE)
+				runOnCommit { onSearchClosed() }
+			}
+		}
+	}
 }

app/src/main/java/org/koitharu/kotatsu/scrobbling/common/ui/selector/ScrobblingSelectorBottomSheet.kt

@@ -1,9 +1,6 @@
 package org.koitharu.kotatsu.scrobbling.common.ui.selector
 
-import android.app.Dialog
-import android.content.DialogInterface
 import android.os.Bundle
-import android.view.KeyEvent
 import android.view.LayoutInflater
 import android.view.MenuItem
 import android.view.View
@@ -20,6 +17,7 @@ import org.koitharu.kotatsu.base.domain.MangaIntent
 import org.koitharu.kotatsu.base.ui.BaseBottomSheet
 import org.koitharu.kotatsu.base.ui.list.OnListItemClickListener
 import org.koitharu.kotatsu.base.ui.list.PaginationScrollListener
+import org.koitharu.kotatsu.base.ui.util.CollapseActionViewCallback
 import org.koitharu.kotatsu.core.model.parcelable.ParcelableManga
 import org.koitharu.kotatsu.databinding.SheetScrobblingSelectorBinding
 import org.koitharu.kotatsu.list.ui.adapter.ListStateHolderListener
@@ -43,7 +41,6 @@ class ScrobblingSelectorBottomSheet :
 	View.OnClickListener,
 	MenuItem.OnActionExpandListener,
 	SearchView.OnQueryTextListener,
-	DialogInterface.OnKeyListener,
 	TabLayout.OnTabSelectedListener,
 	ListStateHolderListener {
 
@@ -53,6 +50,8 @@ class ScrobblingSelectorBottomSheet :
 	@Inject
 	lateinit var coil: ImageLoader
 
+	private var collapsibleActionViewCallback: CollapseActionViewCallback? = null
+
 	private val viewModel by assistedViewModels {
 		viewModelFactory.create(
 			requireArguments().requireParcelable<ParcelableManga>(MangaIntent.KEY_MANGA).manga,
@@ -63,12 +62,6 @@ class ScrobblingSelectorBottomSheet :
 		return SheetScrobblingSelectorBinding.inflate(inflater, container, false)
 	}
 
-	override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
-		return super.onCreateDialog(savedInstanceState).also {
-			it.setOnKeyListener(this)
-		}
-	}
-
 	override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
 		super.onViewCreated(view, savedInstanceState)
 		val listAdapter = ScrobblerSelectorAdapter(viewLifecycleOwner, coil, this, this)
@@ -102,6 +95,11 @@ class ScrobblingSelectorBottomSheet :
 		}
 	}
 
+	override fun onDestroyView() {
+		super.onDestroyView()
+		collapsibleActionViewCallback = null
+	}
+
 	override fun onClick(v: View) {
 		when (v.id) {
 			R.id.button_done -> viewModel.onDoneClick()
@@ -126,6 +124,7 @@ class ScrobblingSelectorBottomSheet :
 
 	override fun onMenuItemActionExpand(item: MenuItem): Boolean {
 		setExpanded(isExpanded = true, isLocked = true)
+		collapsibleActionViewCallback?.onMenuItemActionExpand(item)
 		return true
 	}
 
@@ -133,6 +132,7 @@ class ScrobblingSelectorBottomSheet :
 		val searchView = (item.actionView as? SearchView) ?: return false
 		searchView.setQuery("", false)
 		searchView.post { setExpanded(isExpanded = false, isLocked = false) }
+		collapsibleActionViewCallback?.onMenuItemActionCollapse(item)
 		return true
 	}
 
@@ -147,19 +147,6 @@ class ScrobblingSelectorBottomSheet :
 
 	override fun onQueryTextChange(newText: String?): Boolean = false
 
-	override fun onKey(dialog: DialogInterface?, keyCode: Int, event: KeyEvent?): Boolean {
-		if (keyCode == KeyEvent.KEYCODE_BACK) {
-			val menuItem = binding.headerBar.menu.findItem(R.id.action_search) ?: return false
-			if (menuItem.isActionViewExpanded) {
-				if (event?.action == KeyEvent.ACTION_UP) {
-					menuItem.collapseActionView()
-				}
-				return true
-			}
-		}
-		return false
-	}
-
 	override fun onTabSelected(tab: TabLayout.Tab) {
 		viewModel.setScrobblerIndex(tab.position)
 	}
@@ -193,6 +180,9 @@ class ScrobblingSelectorBottomSheet :
 		searchView.setOnQueryTextListener(this)
 		searchView.setIconifiedByDefault(false)
 		searchView.queryHint = searchMenuItem.title
+		collapsibleActionViewCallback = CollapseActionViewCallback(searchMenuItem).also {
+			onBackPressedDispatcher.addCallback(it)
+		}
 	}
 
 	private fun initTabs() {

app/src/main/java/org/koitharu/kotatsu/settings/sources/auth/SourceAuthActivity.kt

@@ -17,6 +17,7 @@ import org.koitharu.kotatsu.base.ui.BaseActivity
 import org.koitharu.kotatsu.browser.BrowserCallback
 import org.koitharu.kotatsu.browser.BrowserClient
 import org.koitharu.kotatsu.browser.ProgressChromeClient
+import org.koitharu.kotatsu.browser.WebViewBackPressedCallback
 import org.koitharu.kotatsu.core.network.CommonHeaders
 import org.koitharu.kotatsu.core.network.CommonHeadersInterceptor
 import org.koitharu.kotatsu.core.parser.MangaRepository
@@ -34,6 +35,7 @@ class SourceAuthActivity : BaseActivity<ActivityBrowserBinding>(), BrowserCallba
 	@Inject
 	lateinit var mangaRepositoryFactory: MangaRepository.Factory
 
+	private lateinit var onBackPressedCallback: WebViewBackPressedCallback
 	private lateinit var authProvider: MangaParserAuthProvider
 
 	@SuppressLint("SetJavaScriptEnabled")
@@ -66,6 +68,8 @@ class SourceAuthActivity : BaseActivity<ActivityBrowserBinding>(), BrowserCallba
 		}
 		binding.webView.webViewClient = BrowserClient(this)
 		binding.webView.webChromeClient = ProgressChromeClient(binding.progressBar)
+		onBackPressedCallback = WebViewBackPressedCallback(binding.webView)
+		onBackPressedDispatcher.addCallback(onBackPressedCallback)
 		if (savedInstanceState != null) {
 			return
 		}
@@ -103,14 +107,6 @@ class SourceAuthActivity : BaseActivity<ActivityBrowserBinding>(), BrowserCallba
 		else -> super.onOptionsItemSelected(item)
 	}
 
-	override fun onBackPressed() {
-		if (binding.webView.canGoBack()) {
-			binding.webView.goBack()
-		} else {
-			super.onBackPressed()
-		}
-	}
-
 	override fun onPause() {
 		binding.webView.onPause()
 		super.onPause()
@@ -135,6 +131,10 @@ class SourceAuthActivity : BaseActivity<ActivityBrowserBinding>(), BrowserCallba
 		supportActionBar?.subtitle = subtitle
 	}
 
+	override fun onHistoryChanged() {
+		onBackPressedCallback.onHistoryChanged()
+	}
+
 	override fun onWindowInsetsChanged(insets: Insets) {
 		binding.appbar.updatePadding(top = insets.top)
 		binding.webView.updatePadding(bottom = insets.bottom)

app/src/main/java/org/koitharu/kotatsu/sync/ui/SyncAuthActivity.kt

@@ -8,6 +8,7 @@ import android.text.Editable
 import android.text.TextWatcher
 import android.view.View
 import android.widget.Button
+import androidx.activity.OnBackPressedCallback
 import androidx.activity.viewModels
 import androidx.core.graphics.Insets
 import androidx.core.view.isGone
@@ -28,6 +29,7 @@ class SyncAuthActivity : BaseActivity<ActivitySyncAuthBinding>(), View.OnClickLi
 
 	private var accountAuthenticatorResponse: AccountAuthenticatorResponse? = null
 	private var resultBundle: Bundle? = null
+	private val pageBackCallback = PageBackCallback()
 
 	private val viewModel by viewModels<SyncAuthViewModel>()
 
@@ -44,9 +46,13 @@ class SyncAuthActivity : BaseActivity<ActivitySyncAuthBinding>(), View.OnClickLi
 		binding.editEmail.addTextChangedListener(EmailTextWatcher(binding.buttonNext))
 		binding.editPassword.addTextChangedListener(PasswordTextWatcher(binding.buttonDone))
 
+		onBackPressedDispatcher.addCallback(pageBackCallback)
+
 		viewModel.onTokenObtained.observe(this, ::onTokenReceived)
 		viewModel.onError.observe(this, ::onError)
 		viewModel.isLoading.observe(this, ::onLoadingStateChanged)
+
+		pageBackCallback.update()
 	}
 
 	override fun onWindowInsetsChanged(insets: Insets) {
@@ -59,27 +65,23 @@ class SyncAuthActivity : BaseActivity<ActivitySyncAuthBinding>(), View.OnClickLi
 		)
 	}
 
-	@Suppress("DEPRECATION", "OVERRIDE_DEPRECATION")
-	override fun onBackPressed() {
-		if (binding.switcher.isVisible && binding.switcher.displayedChild > 0) {
-			binding.switcher.showPrevious()
-		} else {
-			super.onBackPressed()
-		}
-	}
-
 	override fun onClick(v: View) {
 		when (v.id) {
 			R.id.button_cancel -> {
 				setResult(RESULT_CANCELED)
 				finish()
 			}
+
 			R.id.button_next -> {
 				binding.switcher.showNext()
+				pageBackCallback.update()
 			}
+
 			R.id.button_back -> {
 				binding.switcher.showPrevious()
+				pageBackCallback.update()
 			}
+
 			R.id.button_done -> {
 				viewModel.obtainToken(
 					email = binding.editEmail.text.toString(),
@@ -105,6 +107,7 @@ class SyncAuthActivity : BaseActivity<ActivitySyncAuthBinding>(), View.OnClickLi
 		TransitionManager.beginDelayedTransition(binding.root, Fade())
 		binding.switcher.isGone = isLoading
 		binding.layoutProgress.isVisible = isLoading
+		pageBackCallback.update()
 	}
 
 	private fun onError(error: Throwable) {
@@ -161,4 +164,16 @@ class SyncAuthActivity : BaseActivity<ActivitySyncAuthBinding>(), View.OnClickLi
 			button.isEnabled = text != null && text.length >= 4
 		}
 	}
+
+	private inner class PageBackCallback : OnBackPressedCallback(false) {
+
+		override fun handleOnBackPressed() {
+			binding.switcher.showPrevious()
+			update()
+		}
+
+		fun update() {
+			isEnabled = binding.switcher.isVisible && binding.switcher.displayedChild > 0
+		}
+	}
 }