Fix crashes and improve predictive back support

app/build.gradle

@@ -94,6 +94,7 @@ dependencies {
 	implementation 'androidx.core:core-ktx:1.13.1'
 	implementation 'androidx.activity:activity-ktx:1.9.0'
 	implementation 'androidx.fragment:fragment-ktx:1.7.1'
+	implementation 'androidx.transition:transition-ktx:1.5.0'
 	implementation 'androidx.collection:collection-ktx:1.4.0'
 	implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.8.0'
 	implementation 'androidx.lifecycle:lifecycle-service:2.8.0'

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

@@ -108,8 +108,10 @@ class BrowserActivity : BaseActivity<ActivityBrowserBinding>(), BrowserCallback
 
 	override fun onDestroy() {
 		super.onDestroy()
-		viewBinding.webView.stopLoading()
-		viewBinding.webView.destroy()
+		if (hasViewBinding()) {
+			viewBinding.webView.stopLoading()
+			viewBinding.webView.destroy()
+		}
 	}
 
 	override fun onLoadingStateChanged(isLoading: Boolean) {

app/src/main/kotlin/org/koitharu/kotatsu/core/parser/MangaLoaderContextImpl.kt

@@ -16,6 +16,7 @@ import okhttp3.OkHttpClient
 import okhttp3.Response
 import okhttp3.ResponseBody.Companion.asResponseBody
 import okio.Buffer
+import okio.IOException
 import org.koitharu.kotatsu.core.network.MangaHttpClient
 import org.koitharu.kotatsu.core.network.cookies.MutableCookieJar
 import org.koitharu.kotatsu.core.prefs.SourceSettings
@@ -29,6 +30,7 @@ import org.koitharu.kotatsu.parsers.bitmap.Bitmap
 import org.koitharu.kotatsu.parsers.config.MangaSourceConfig
 import org.koitharu.kotatsu.parsers.model.MangaSource
 import org.koitharu.kotatsu.parsers.network.UserAgents
+import org.koitharu.kotatsu.parsers.util.runCatchingCancellable
 import java.lang.ref.WeakReference
 import java.util.Locale
 import javax.inject.Inject
@@ -75,7 +77,10 @@ class MangaLoaderContextImpl @Inject constructor(
 		return LocaleListCompat.getAdjustedDefault().toList()
 	}
 
-	override fun redrawImageResponse(response: Response, redraw: (image: Bitmap) -> Bitmap): Response {
+	override fun redrawImageResponse(
+		response: Response,
+		redraw: (image: Bitmap) -> Bitmap
+	): Response = runCatchingCancellable {
 		val image = response.requireBody().byteStream()
 
 		val opts = BitmapFactory.Options()
@@ -87,9 +92,15 @@ class MangaLoaderContextImpl @Inject constructor(
 			result.compressTo(it.outputStream())
 		}.asResponseBody("image/jpeg".toMediaType())
 
-		return response.newBuilder()
+		response.newBuilder()
 			.body(body)
 			.build()
+	}.getOrElse { error ->
+		if (error is IOException) {
+			throw error
+		} else {
+			throw IOException(error.message, error)
+		}
 	}
 
 	override fun createBitmap(width: Int, height: Int): Bitmap {

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/BaseActivity.kt

@@ -92,9 +92,6 @@ abstract class BaseActivity<B : ViewBinding> :
 	}
 
 	override fun onSupportNavigateUp(): Boolean {
-		if (supportFragmentManager.popBackStackImmediate()) {
-			return false
-		}
 		dispatchNavigateUp()
 		return true
 	}
@@ -159,6 +156,8 @@ abstract class BaseActivity<B : ViewBinding> :
 		}
 	}
 
+	protected fun hasViewBinding() = ::viewBinding.isInitialized
+
 	@EntryPoint
 	@InstallIn(SingletonComponent::class)
 	interface BaseActivityEntryPoint {

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/sheet/BottomSheetCollapseCallback.kt

@@ -1,22 +1,34 @@
 package org.koitharu.kotatsu.core.ui.sheet
 
+import android.annotation.SuppressLint
 import android.view.View
+import android.view.ViewGroup
+import androidx.activity.BackEventCompat
 import androidx.activity.OnBackPressedCallback
 import com.google.android.material.bottomsheet.BottomSheetBehavior
 import com.google.android.material.bottomsheet.BottomSheetBehavior.STATE_COLLAPSED
 import com.google.android.material.bottomsheet.BottomSheetBehavior.STATE_EXPANDED
 import com.google.android.material.bottomsheet.BottomSheetBehavior.STATE_HALF_EXPANDED
+import com.google.android.material.bottomsheet.BottomSheetBehavior.STATE_HIDDEN
 
 class BottomSheetCollapseCallback(
-	private val behavior: BottomSheetBehavior<*>,
-) : OnBackPressedCallback(behavior.state == STATE_EXPANDED) {
+	private val sheet: ViewGroup,
+	private val behavior: BottomSheetBehavior<*> = BottomSheetBehavior.from(sheet),
+) : OnBackPressedCallback(behavior.state == STATE_EXPANDED || behavior.state == STATE_HALF_EXPANDED) {
 
 	init {
 		behavior.addBottomSheetCallback(
 			object : BottomSheetBehavior.BottomSheetCallback() {
 
+				@SuppressLint("SwitchIntDef")
 				override fun onStateChanged(view: View, state: Int) {
-					isEnabled = state == STATE_EXPANDED || state == STATE_HALF_EXPANDED
+					when (state) {
+						STATE_EXPANDED,
+						STATE_HALF_EXPANDED -> isEnabled = true
+
+						STATE_COLLAPSED,
+						STATE_HIDDEN -> isEnabled = false
+					}
 				}
 
 				override fun onSlide(p0: View, p1: Float) = Unit
@@ -24,7 +36,11 @@ class BottomSheetCollapseCallback(
 		)
 	}
 
-	override fun handleOnBackPressed() {
-		behavior.state = STATE_COLLAPSED
-	}
+	override fun handleOnBackPressed() = behavior.handleBackInvoked()
+
+	override fun handleOnBackCancelled() = behavior.cancelBackProgress()
+
+	override fun handleOnBackProgressed(backEvent: BackEventCompat) = behavior.updateBackProgress(backEvent)
+
+	override fun handleOnBackStarted(backEvent: BackEventCompat) = behavior.startBackProgress(backEvent)
 }

app/src/main/kotlin/org/koitharu/kotatsu/details/ui/DetailsActivity.kt

@@ -31,7 +31,6 @@ import coil.request.ImageRequest
 import coil.request.SuccessResult
 import coil.transform.CircleCropTransformation
 import coil.util.CoilUtils
-import com.google.android.material.bottomsheet.BottomSheetBehavior
 import com.google.android.material.chip.Chip
 import com.google.android.material.snackbar.Snackbar
 import dagger.hilt.android.AndroidEntryPoint
@@ -153,8 +152,8 @@ class DetailsActivity :
 		viewBinding.textViewDescription.movementMethod = LinkMovementMethodCompat.getInstance()
 		viewBinding.chipsTags.onChipClickListener = this
 		TitleScrollCoordinator(viewBinding.textViewTitle).attach(viewBinding.scrollView)
-		viewBinding.containerBottomSheet?.let { BottomSheetBehavior.from(it) }?.let { behavior ->
-			onBackPressedDispatcher.addCallback(BottomSheetCollapseCallback(behavior))
+		viewBinding.containerBottomSheet?.let { sheet ->
+			onBackPressedDispatcher.addCallback(BottomSheetCollapseCallback(sheet))
 		}
 
 		viewModel.details.filterNotNull().observe(this, ::onMangaUpdated)

app/src/main/kotlin/org/koitharu/kotatsu/settings/SettingsActivity.kt

@@ -125,7 +125,7 @@ class SettingsActivity :
 		supportFragmentManager.commit {
 			setReorderingAllowed(true)
 			replace(R.id.container, fragment)
-			setTransition(FragmentTransaction.TRANSIT_FRAGMENT_MATCH_ACTIVITY_OPEN)
+			setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)
 			if (!isMasterDetails || (hasFragment && !isFromRoot)) {
 				addToBackStack(null)
 			}

app/src/main/kotlin/org/koitharu/kotatsu/settings/storage/MangaDirectorySelectDialog.kt

@@ -11,7 +11,6 @@ import androidx.activity.result.contract.ActivityResultContracts
 import androidx.fragment.app.FragmentManager
 import androidx.fragment.app.viewModels
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
-import com.google.android.material.snackbar.Snackbar
 import com.hannesdorfmann.adapterdelegates4.AsyncListDifferDelegationAdapter
 import dagger.hilt.android.AndroidEntryPoint
 import org.koitharu.kotatsu.R
@@ -41,7 +40,13 @@ class MangaDirectorySelectDialog : AlertDialogFragment<DialogDirectorySelectBind
 	) {
 		if (it) {
 			viewModel.refresh()
-			pickFileTreeLauncher.launch(null)
+			if (!pickFileTreeLauncher.tryLaunch(null)) {
+				Toast.makeText(
+					context ?: return@registerForActivityResult,
+					R.string.operation_not_supported,
+					Toast.LENGTH_SHORT,
+				).show()
+			}
 		}
 	}
 

app/src/main/res/layout-w600dp-land/activity_settings.xml

@@ -68,7 +68,7 @@
 				tools:text="@string/appearance" />
 
 			<androidx.fragment.app.FragmentContainerView
-				android:id="@+id/container"
+				android:id="@id/container"
 				android:layout_width="match_parent"
 				android:layout_height="match_parent" />
 

app/src/main/res/layout/activity_settings.xml

@@ -9,12 +9,13 @@
 		android:id="@+id/appbar"
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
-		android:fitsSystemWindows="true">
+		android:fitsSystemWindows="true"
+		app:liftOnScroll="false">
 
 		<com.google.android.material.appbar.MaterialToolbar
 			android:id="@id/toolbar"
 			android:layout_width="match_parent"
-			android:layout_height="?attr/actionBarSize"
+			android:layout_height="wrap_content"
 			app:layout_collapseMode="pin" />
 
 	</com.google.android.material.appbar.AppBarLayout>