Support for custom directories for manga

app/build.gradle

@@ -113,10 +113,10 @@ dependencies {
 		exclude group: 'com.google.j2objc', module: 'j2objc-annotations'
 	}
 
-	implementation 'androidx.room:room-runtime:2.5.1'
+	implementation 'androidx.room:room-runtime:2.5.2'
-	implementation 'androidx.room:room-ktx:2.5.1'
+	implementation 'androidx.room:room-ktx:2.5.2'
 	//noinspection KaptUsageInsteadOfKsp
-	kapt 'androidx.room:room-compiler:2.5.1'
+	kapt 'androidx.room:room-compiler:2.5.2'
 
 	implementation 'com.squareup.okhttp3:okhttp:4.11.0'
 	implementation 'com.squareup.okhttp3:okhttp-dnsoverhttps:4.11.0'

app/src/main/AndroidManifest.xml

@@ -18,6 +18,12 @@
 	<uses-permission android:name="android.permission.READ_SYNC_SETTINGS" />
 	<uses-permission android:name="android.permission.WRITE_SYNC_SETTINGS" />
 	<uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+	<uses-permission
+		android:name="android.permission.WRITE_EXTERNAL_STORAGE"
+		android:maxSdkVersion="29" />
+	<uses-permission
+		android:name="android.permission.MANAGE_EXTERNAL_STORAGE"
+		tools:ignore="ScopedStorage" />
 
 	<application
 		android:name="org.koitharu.kotatsu.KotatsuApp"
@@ -32,6 +38,7 @@
 		android:largeHeap="true"
 		android:localeConfig="@xml/locales"
 		android:networkSecurityConfig="@xml/network_security_config"
+		android:requestLegacyExternalStorage="true"
 		android:roundIcon="@mipmap/ic_launcher_round"
 		android:supportsRtl="true"
 		android:theme="@style/Theme.Kotatsu"

app/src/main/kotlin/org/koitharu/kotatsu/core/exceptions/resolve/ToastErrorObserver.kt

@@ -0,0 +1,17 @@
+package org.koitharu.kotatsu.core.exceptions.resolve
+
+import android.view.View
+import android.widget.Toast
+import androidx.fragment.app.Fragment
+import org.koitharu.kotatsu.core.util.ext.getDisplayMessage
+
+class ToastErrorObserver(
+	host: View,
+	fragment: Fragment?,
+) : ErrorObserver(host, fragment, null, null) {
+
+	override suspend fun emit(value: Throwable) {
+		val toast = Toast.makeText(host.context, value.getDisplayMessage(host.context.resources), Toast.LENGTH_SHORT)
+		toast.show()
+	}
+}

app/src/main/kotlin/org/koitharu/kotatsu/core/prefs/AppSettings.kt

@@ -21,9 +21,11 @@ import org.koitharu.kotatsu.core.util.ext.filterToSet
 import org.koitharu.kotatsu.core.util.ext.getEnumValue
 import org.koitharu.kotatsu.core.util.ext.observe
 import org.koitharu.kotatsu.core.util.ext.putEnumValue
+import org.koitharu.kotatsu.core.util.ext.takeIfReadable
 import org.koitharu.kotatsu.core.util.ext.toUriOrNull
 import org.koitharu.kotatsu.parsers.model.MangaSource
 import org.koitharu.kotatsu.parsers.model.SortOrder
+import org.koitharu.kotatsu.parsers.util.mapNotNullToSet
 import org.koitharu.kotatsu.parsers.util.mapToSet
 import org.koitharu.kotatsu.shelf.domain.model.ShelfSection
 import java.io.File
@@ -234,6 +236,16 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 			if (key == null) ScreenshotsPolicy.ALLOW else ScreenshotsPolicy.valueOf(key)
 		}.getOrDefault(ScreenshotsPolicy.ALLOW)
 
+	var userSpecifiedMangaDirectories: Set<File>
+		get() {
+			val set = prefs.getStringSet(KEY_LOCAL_MANGA_DIRS, emptySet()).orEmpty()
+			return set.mapNotNullToSet { File(it).takeIfReadable() }
+		}
+		set(value) {
+			val set = value.mapToSet { it.absolutePath }
+			prefs.edit { putStringSet(KEY_LOCAL_MANGA_DIRS, set) }
+		}
+
 	var mangaStorageDir: File?
 		get() = prefs.getString(KEY_LOCAL_STORAGE, null)?.let {
 			File(it)
@@ -461,6 +473,7 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 		const val KEY_PROXY_LOGIN = "proxy_login"
 		const val KEY_PROXY_PASSWORD = "proxy_password"
 		const val KEY_IMAGES_PROXY = "images_proxy"
+		const val KEY_LOCAL_MANGA_DIRS = "local_manga_dirs"
 
 		// About
 		const val KEY_APP_UPDATE = "app_update"

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

@@ -1,101 +0,0 @@
-package org.koitharu.kotatsu.core.ui.dialog
-
-import android.content.Context
-import android.content.DialogInterface
-import android.view.LayoutInflater
-import android.view.View
-import android.view.ViewGroup
-import android.widget.BaseAdapter
-import androidx.annotation.StringRes
-import androidx.appcompat.app.AlertDialog
-import com.google.android.material.dialog.MaterialAlertDialogBuilder
-import kotlinx.coroutines.runBlocking
-import org.koitharu.kotatsu.R
-import org.koitharu.kotatsu.databinding.ItemStorageBinding
-import org.koitharu.kotatsu.local.data.LocalStorageManager
-import java.io.File
-
-class StorageSelectDialog private constructor(private val delegate: AlertDialog) :
-	DialogInterface by delegate {
-
-	fun show() = delegate.show()
-
-	class Builder(context: Context, storageManager: LocalStorageManager, listener: OnStorageSelectListener) {
-
-		private val adapter = VolumesAdapter(storageManager)
-		private val delegate = MaterialAlertDialogBuilder(context)
-
-		init {
-			if (adapter.isEmpty) {
-				delegate.setMessage(R.string.cannot_find_available_storage)
-			} else {
-				val defaultValue = runBlocking {
-					storageManager.getDefaultWriteableDir()
-				}
-				adapter.selectedItemPosition = adapter.volumes.indexOfFirst {
-					it.first.canonicalPath == defaultValue?.canonicalPath
-				}
-				delegate.setAdapter(adapter) { d, i ->
-					listener.onStorageSelected(adapter.getItem(i).first)
-					d.dismiss()
-				}
-			}
-		}
-
-		fun setTitle(@StringRes titleResId: Int): Builder {
-			delegate.setTitle(titleResId)
-			return this
-		}
-
-		fun setTitle(title: CharSequence): Builder {
-			delegate.setTitle(title)
-			return this
-		}
-
-		fun setNegativeButton(@StringRes textId: Int): Builder {
-			delegate.setNegativeButton(textId, null)
-			return this
-		}
-
-		fun create() = StorageSelectDialog(delegate.create())
-	}
-
-	private class VolumesAdapter(storageManager: LocalStorageManager) : BaseAdapter() {
-
-		var selectedItemPosition: Int = -1
-		val volumes = getAvailableVolumes(storageManager)
-
-		override fun getView(position: Int, convertView: View?, parent: ViewGroup): View {
-			val view = convertView ?: LayoutInflater.from(parent.context).inflate(R.layout.item_storage, parent, false)
-			val binding = (view.tag as? ItemStorageBinding) ?: ItemStorageBinding.bind(view).also {
-				view.tag = it
-			}
-			val item = volumes[position]
-			binding.imageViewIndicator.isChecked = selectedItemPosition == position
-			binding.textViewTitle.text = item.second
-			binding.textViewSubtitle.text = item.first.path
-			return view
-		}
-
-		override fun getItem(position: Int): Pair<File, String> = volumes[position]
-
-		override fun getItemId(position: Int) = position.toLong()
-
-		override fun getCount() = volumes.size
-
-		override fun hasStableIds() = true
-
-		private fun getAvailableVolumes(storageManager: LocalStorageManager): List<Pair<File, String>> {
-			return runBlocking {
-				storageManager.getWriteableDirs().map {
-					it to storageManager.getStorageDisplayName(it)
-				}
-			}
-		}
-	}
-
-	fun interface OnStorageSelectListener {
-
-		fun onStorageSelected(file: File)
-	}
-}

app/src/main/kotlin/org/koitharu/kotatsu/core/util/FileUtil.java

@@ -0,0 +1,117 @@
+package org.koitharu.kotatsu.core.util;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.net.Uri;
+import android.os.Build;
+import android.os.storage.StorageManager;
+import android.os.storage.StorageVolume;
+import android.provider.DocumentsContract;
+
+import androidx.annotation.Nullable;
+
+import java.io.File;
+import java.lang.reflect.Array;
+import java.lang.reflect.Method;
+import java.util.List;
+
+public final class FileUtil {
+
+	private static final String PRIMARY_VOLUME_NAME = "primary";
+
+	@Nullable
+	public static String getFullPathFromTreeUri(@Nullable final Uri treeUri, Context con) {
+		if (treeUri == null) return null;
+		String volumePath = getVolumePath(getVolumeIdFromTreeUri(treeUri), con);
+		if (volumePath == null) return File.separator;
+		if (volumePath.endsWith(File.separator))
+			volumePath = volumePath.substring(0, volumePath.length() - 1);
+
+		String documentPath = getDocumentPathFromTreeUri(treeUri);
+		if (documentPath.endsWith(File.separator))
+			documentPath = documentPath.substring(0, documentPath.length() - 1);
+
+		if (documentPath.length() > 0) {
+			if (documentPath.startsWith(File.separator))
+				return volumePath + documentPath;
+			else
+				return volumePath + File.separator + documentPath;
+		} else return volumePath;
+	}
+
+
+	private static String getVolumePath(final String volumeId, Context context) {
+		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+			return getVolumePathForAndroid11AndAbove(volumeId, context);
+		} else
+			return getVolumePathBeforeAndroid11(volumeId, context);
+	}
+
+
+	private static String getVolumePathBeforeAndroid11(final String volumeId, Context context) {
+		try {
+			StorageManager mStorageManager = (StorageManager) context.getSystemService(Context.STORAGE_SERVICE);
+			Class<?> storageVolumeClazz = Class.forName("android.os.storage.StorageVolume");
+			Method getVolumeList = mStorageManager.getClass().getMethod("getVolumeList");
+			Method getUuid = storageVolumeClazz.getMethod("getUuid");
+			Method getPath = storageVolumeClazz.getMethod("getPath");
+			Method isPrimary = storageVolumeClazz.getMethod("isPrimary");
+			Object result = getVolumeList.invoke(mStorageManager);
+
+			final int length = Array.getLength(result);
+			for (int i = 0; i < length; i++) {
+				Object storageVolumeElement = Array.get(result, i);
+				String uuid = (String) getUuid.invoke(storageVolumeElement);
+				Boolean primary = (Boolean) isPrimary.invoke(storageVolumeElement);
+
+				if (primary && PRIMARY_VOLUME_NAME.equals(volumeId))    // primary volume?
+					return (String) getPath.invoke(storageVolumeElement);
+
+				if (uuid != null && uuid.equals(volumeId))    // other volumes?
+					return (String) getPath.invoke(storageVolumeElement);
+			}
+			// not found.
+			return null;
+		} catch (Exception ex) {
+			return null;
+		}
+	}
+
+	@TargetApi(Build.VERSION_CODES.R)
+	private static String getVolumePathForAndroid11AndAbove(final String volumeId, Context context) {
+		try {
+			StorageManager mStorageManager = (StorageManager) context.getSystemService(Context.STORAGE_SERVICE);
+			List<StorageVolume> storageVolumes = mStorageManager.getStorageVolumes();
+			for (StorageVolume storageVolume : storageVolumes) {
+				// primary volume?
+				if (storageVolume.isPrimary() && PRIMARY_VOLUME_NAME.equals(volumeId))
+					return storageVolume.getDirectory().getPath();
+
+				// other volumes?
+				String uuid = storageVolume.getUuid();
+				if (uuid != null && uuid.equals(volumeId))
+					return storageVolume.getDirectory().getPath();
+
+			}
+			// not found.
+			return null;
+		} catch (Exception ex) {
+			return null;
+		}
+	}
+
+	private static String getVolumeIdFromTreeUri(final Uri treeUri) {
+		final String docId = DocumentsContract.getTreeDocumentId(treeUri);
+		final String[] split = docId.split(":");
+		if (split.length > 0) return split[0];
+		else return null;
+	}
+
+
+	private static String getDocumentPathFromTreeUri(final Uri treeUri) {
+		final String docId = DocumentsContract.getTreeDocumentId(treeUri);
+		final String[] split = docId.split(":");
+		if ((split.length >= 2) && (split[1] != null)) return split[1];
+		else return File.separator;
+	}
+}

app/src/main/kotlin/org/koitharu/kotatsu/core/util/ext/ContentResolver.kt

@@ -0,0 +1,90 @@
+package org.koitharu.kotatsu.core.util.ext
+
+import android.annotation.TargetApi
+import android.content.Context
+import android.net.Uri
+import android.os.Build
+import android.os.storage.StorageManager
+import android.provider.DocumentsContract
+import org.koitharu.kotatsu.parsers.util.removeSuffix
+import java.io.File
+import java.lang.reflect.Array as ArrayReflect
+
+private const val PRIMARY_VOLUME_NAME = "primary"
+
+fun Uri.resolveFile(context: Context): File? {
+	val volumeId = getVolumeIdFromTreeUri(this) ?: return null
+	val volumePath = getVolumePath(volumeId, context)?.removeSuffix(File.separatorChar) ?: return null
+	val documentPath = getDocumentPathFromTreeUri(this)?.removeSuffix(File.separatorChar) ?: return null
+
+	return File(
+		if (documentPath.isNotEmpty()) {
+			if (documentPath.startsWith(File.separator)) {
+				volumePath + documentPath
+			} else {
+				volumePath + File.separator + documentPath
+			}
+		} else {
+			volumePath
+		},
+	)
+}
+
+private fun getVolumePath(volumeId: String, context: Context): String? {
+	return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+		getVolumePathForAndroid11AndAbove(volumeId, context)
+	} else {
+		getVolumePathBeforeAndroid11(volumeId, context)
+	}
+}
+
+
+private fun getVolumePathBeforeAndroid11(volumeId: String, context: Context): String? = runCatching {
+	val mStorageManager = context.getSystemService(Context.STORAGE_SERVICE) as StorageManager
+	val storageVolumeClazz = Class.forName("android.os.storage.StorageVolume")
+	val getVolumeList = mStorageManager.javaClass.getMethod("getVolumeList")
+	val getUuid = storageVolumeClazz.getMethod("getUuid")
+	val getPath = storageVolumeClazz.getMethod("getPath")
+	val isPrimary = storageVolumeClazz.getMethod("isPrimary")
+	val result = getVolumeList.invoke(mStorageManager)
+	val length = ArrayReflect.getLength(checkNotNull(result))
+	(0 until length).firstNotNullOfOrNull { i ->
+		val storageVolumeElement = ArrayReflect.get(result, i)
+		val uuid = getUuid.invoke(storageVolumeElement) as String
+		val primary = isPrimary.invoke(storageVolumeElement) as Boolean
+		when {
+			primary && volumeId == PRIMARY_VOLUME_NAME -> getPath.invoke(storageVolumeElement) as String
+			uuid == volumeId -> getPath.invoke(storageVolumeElement) as String
+			else -> null
+		}
+	}
+}.onFailure {
+	it.printStackTraceDebug()
+}.getOrNull()
+
+@TargetApi(Build.VERSION_CODES.R)
+private fun getVolumePathForAndroid11AndAbove(volumeId: String, context: Context): String? = runCatching {
+	val storageManager = context.getSystemService(Context.STORAGE_SERVICE) as StorageManager
+	storageManager.storageVolumes.firstNotNullOfOrNull { volume ->
+		if (volume.isPrimary && volumeId == PRIMARY_VOLUME_NAME) {
+			volume.directory?.path
+		} else {
+			val uuid = volume.uuid
+			if (uuid != null && uuid == volumeId) volume.directory?.path else null
+		}
+	}
+}.onFailure {
+	it.printStackTraceDebug()
+}.getOrNull()
+
+private fun getVolumeIdFromTreeUri(treeUri: Uri): String? {
+	val docId = DocumentsContract.getTreeDocumentId(treeUri)
+	val split = docId.split(":".toRegex())
+	return split.firstOrNull()?.takeUnless { it.isEmpty() }
+}
+
+private fun getDocumentPathFromTreeUri(treeUri: Uri): String? {
+	val docId = DocumentsContract.getTreeDocumentId(treeUri)
+	val split: Array<String?> = docId.split(":".toRegex()).dropLastWhile { it.isEmpty() }.toTypedArray()
+	return if (split.size >= 2 && split[1] != null) split[1] else File.separator
+}

app/src/main/kotlin/org/koitharu/kotatsu/core/util/ext/Throwable.kt

@@ -34,6 +34,7 @@ fun Throwable.getDisplayMessage(resources: Resources): String = when (this) {
 
 	is UnsupportedFileException -> resources.getString(R.string.text_file_not_supported)
 	is FileNotFoundException -> resources.getString(R.string.file_not_found)
+	is AccessDeniedException -> resources.getString(R.string.no_access_to_file)
 	is EmptyHistoryException -> resources.getString(R.string.history_is_empty)
 	is SyncApiException,
 	is ContentUnavailableException,

app/src/main/kotlin/org/koitharu/kotatsu/list/ui/MangaListFragment.kt

@@ -78,6 +78,9 @@ abstract class MangaListFragment :
 	private val spanSizeLookup = SpanSizeLookup()
 	private val listCommitCallback = Runnable {
 		spanSizeLookup.invalidateCache()
+		viewBinding?.let {
+			paginationListener?.onScrolled(it.recyclerView, 0, 0)
+		}
 	}
 	open val isSwipeRefreshEnabled = true
 

app/src/main/kotlin/org/koitharu/kotatsu/local/data/LocalStorageManager.kt

@@ -2,6 +2,8 @@ package org.koitharu.kotatsu.local.data
 
 import android.content.ContentResolver
 import android.content.Context
+import android.content.Intent
+import android.net.Uri
 import android.os.StatFs
 import androidx.annotation.WorkerThread
 import dagger.Reusable
@@ -13,6 +15,7 @@ import okhttp3.Cache
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.util.ext.computeSize
 import org.koitharu.kotatsu.core.util.ext.getStorageName
+import org.koitharu.kotatsu.core.util.ext.resolveFile
 import org.koitharu.kotatsu.parsers.util.mapToSet
 import java.io.File
 import javax.inject.Inject
@@ -74,11 +77,33 @@ class LocalStorageManager @Inject constructor(
 		preferredDir ?: getFallbackStorageDir()?.takeIf { it.isWriteable() }
 	}
 
+	suspend fun resolveUri(uri: Uri): File? = runInterruptible(Dispatchers.IO) {
+		uri.resolveFile(context)
+	}
+
+	fun takePermissions(uri: Uri) {
+		val flags = Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION
+		contentResolver.takePersistableUriPermission(uri, flags)
+	}
+
+	@Deprecated("")
 	fun getStorageDisplayName(file: File) = file.getStorageName(context)
 
+	suspend fun getDirectoryDisplayName(dir: File, isFullPath: Boolean): String = runInterruptible(Dispatchers.IO) {
+		val packageName = context.packageName
+		if (dir.absolutePath.contains(packageName)) {
+			dir.getStorageName(context)
+		} else if (isFullPath) {
+			dir.path
+		} else {
+			dir.name
+		}
+	}
+
 	@WorkerThread
 	private fun getConfiguredStorageDirs(): MutableSet<File> {
 		val set = getAvailableStorageDirs()
+		set.addAll(settings.userSpecifiedMangaDirectories)
 		settings.mangaStorageDir?.let {
 			set.add(it)
 		}

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

@@ -11,12 +11,11 @@ import kotlinx.coroutines.withContext
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.ui.BasePreferenceFragment
-import org.koitharu.kotatsu.core.ui.dialog.StorageSelectDialog
+import org.koitharu.kotatsu.core.util.ext.printStackTraceDebug
-import org.koitharu.kotatsu.core.util.ext.getStorageName
 import org.koitharu.kotatsu.core.util.ext.viewLifecycleScope
 import org.koitharu.kotatsu.download.ui.worker.DownloadWorker
 import org.koitharu.kotatsu.local.data.LocalStorageManager
-import org.koitharu.kotatsu.core.util.ext.printStackTraceDebug
+import org.koitharu.kotatsu.settings.storage.MangaDirectorySelectDialog
 import java.io.File
 import javax.inject.Inject
 
@@ -62,12 +61,7 @@ class DownloadsSettingsFragment :
 	override fun onPreferenceTreeClick(preference: Preference): Boolean {
 		return when (preference.key) {
 			AppSettings.KEY_LOCAL_STORAGE -> {
-				val ctx = context ?: return false
+				MangaDirectorySelectDialog.show(childFragmentManager)
-				StorageSelectDialog.Builder(ctx, storageManager, this)
-					.setTitle(preference.title ?: "")
-					.setNegativeButton(android.R.string.cancel)
-					.create()
-					.show()
 				true
 			}
 
@@ -82,7 +76,11 @@ class DownloadsSettingsFragment :
 	private fun Preference.bindStorageName() {
 		viewLifecycleScope.launch {
 			val storage = storageManager.getDefaultWriteableDir()
-			summary = storage?.getStorageName(context) ?: getString(R.string.not_available)
+			summary = if (storage != null) {
+				storageManager.getDirectoryDisplayName(storage, isFullPath = true)
+			} else {
+				getString(R.string.not_available)
+			}
 		}
 	}
 

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

@@ -0,0 +1,21 @@
+package org.koitharu.kotatsu.settings.storage
+
+import com.hannesdorfmann.adapterdelegates4.dsl.adapterDelegateViewBinding
+import org.koitharu.kotatsu.core.ui.list.OnListItemClickListener
+import org.koitharu.kotatsu.core.util.ext.textAndVisible
+import org.koitharu.kotatsu.databinding.ItemStorageBinding
+
+fun directoryAD(
+	clickListener: OnListItemClickListener<DirectoryModel>,
+) = adapterDelegateViewBinding<DirectoryModel, DirectoryModel, ItemStorageBinding>(
+	{ layoutInflater, parent -> ItemStorageBinding.inflate(layoutInflater, parent, false) },
+) {
+
+	binding.root.setOnClickListener { v -> clickListener.onItemClick(item, v) }
+
+	bind {
+		binding.textViewTitle.text = item.title ?: getString(item.titleRes)
+		binding.textViewSubtitle.textAndVisible = item.file?.absolutePath
+		binding.imageViewIndicator.isChecked = item.isChecked
+	}
+}

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

@@ -0,0 +1,22 @@
+package org.koitharu.kotatsu.settings.storage
+
+import androidx.recyclerview.widget.DiffUtil.ItemCallback
+
+class DirectoryDiffCallback : ItemCallback<DirectoryModel>() {
+
+	override fun areItemsTheSame(oldItem: DirectoryModel, newItem: DirectoryModel): Boolean {
+		return oldItem.file == newItem.file
+	}
+
+	override fun areContentsTheSame(oldItem: DirectoryModel, newItem: DirectoryModel): Boolean {
+		return oldItem == newItem
+	}
+
+	override fun getChangePayload(oldItem: DirectoryModel, newItem: DirectoryModel): Any? {
+		return if (oldItem.isChecked != newItem.isChecked) {
+			Unit
+		} else {
+			super.getChangePayload(oldItem, newItem)
+		}
+	}
+}

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

@@ -0,0 +1,33 @@
+package org.koitharu.kotatsu.settings.storage
+
+import androidx.annotation.StringRes
+import org.koitharu.kotatsu.list.ui.model.ListModel
+import java.io.File
+
+class DirectoryModel(
+	val title: String?,
+	@StringRes val titleRes: Int,
+	val file: File?,
+	val isChecked: Boolean,
+) : ListModel {
+
+	override fun equals(other: Any?): Boolean {
+		if (this === other) return true
+		if (javaClass != other?.javaClass) return false
+
+		other as DirectoryModel
+
+		if (title != other.title) return false
+		if (titleRes != other.titleRes) return false
+		if (file != other.file) return false
+		return isChecked == other.isChecked
+	}
+
+	override fun hashCode(): Int {
+		var result = title?.hashCode() ?: 0
+		result = 31 * result + titleRes
+		result = 31 * result + (file?.hashCode() ?: 0)
+		result = 31 * result + isChecked.hashCode()
+		return result
+	}
+}

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

@@ -0,0 +1,78 @@
+package org.koitharu.kotatsu.settings.storage
+
+import android.Manifest
+import android.os.Build
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+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.hannesdorfmann.adapterdelegates4.AsyncListDifferDelegationAdapter
+import dagger.hilt.android.AndroidEntryPoint
+import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.core.exceptions.resolve.ToastErrorObserver
+import org.koitharu.kotatsu.core.ui.AlertDialogFragment
+import org.koitharu.kotatsu.core.ui.list.OnListItemClickListener
+import org.koitharu.kotatsu.core.util.ext.observe
+import org.koitharu.kotatsu.core.util.ext.observeEvent
+import org.koitharu.kotatsu.core.util.ext.showDistinct
+import org.koitharu.kotatsu.databinding.DialogDirectorySelectBinding
+
+@AndroidEntryPoint
+class MangaDirectorySelectDialog : AlertDialogFragment<DialogDirectorySelectBinding>(),
+	OnListItemClickListener<DirectoryModel> {
+
+	private val viewModel: MangaDirectorySelectViewModel by viewModels()
+	private val pickFileTreeLauncher = registerForActivityResult(ActivityResultContracts.OpenDocumentTree()) {
+		if (it != null) viewModel.onCustomDirectoryPicked(it)
+	}
+	private val permissionRequestLauncher = registerForActivityResult(
+		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+			RequestStorageManagerPermissionContract()
+		} else {
+			ActivityResultContracts.RequestPermission()
+		},
+	) {
+		pickFileTreeLauncher.launch(null)
+	}
+
+	override fun onCreateViewBinding(inflater: LayoutInflater, container: ViewGroup?): DialogDirectorySelectBinding {
+		return DialogDirectorySelectBinding.inflate(inflater, container, false)
+	}
+
+	override fun onViewBindingCreated(binding: DialogDirectorySelectBinding, savedInstanceState: Bundle?) {
+		super.onViewBindingCreated(binding, savedInstanceState)
+		val adapter = AsyncListDifferDelegationAdapter(DirectoryDiffCallback(), directoryAD(this))
+		binding.root.adapter = adapter
+		viewModel.items.observe(viewLifecycleOwner) { adapter.items = it }
+		viewModel.onDismissDialog.observeEvent(viewLifecycleOwner) { dismiss() }
+		viewModel.onPickDirectory.observeEvent(viewLifecycleOwner) { pickCustomDirectory() }
+		viewModel.onError.observeEvent(viewLifecycleOwner, ToastErrorObserver(binding.root, this))
+	}
+
+	override fun onBuildDialog(builder: MaterialAlertDialogBuilder): MaterialAlertDialogBuilder {
+		return super.onBuildDialog(builder)
+			.setCancelable(true)
+			.setTitle(R.string.manga_save_location)
+			.setNegativeButton(android.R.string.cancel, null)
+	}
+
+	override fun onItemClick(item: DirectoryModel, view: View) {
+		viewModel.onItemClick(item)
+	}
+
+	private fun pickCustomDirectory() {
+		permissionRequestLauncher.launch(Manifest.permission.WRITE_EXTERNAL_STORAGE)
+	}
+
+	companion object {
+
+		private const val TAG = "MangaDirectorySelectDialog"
+
+		fun show(fm: FragmentManager) = MangaDirectorySelectDialog()
+			.showDistinct(fm, TAG)
+	}
+}

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

@@ -0,0 +1,70 @@
+package org.koitharu.kotatsu.settings.storage
+
+import android.net.Uri
+import dagger.hilt.android.lifecycle.HiltViewModel
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.MutableStateFlow
+import okio.FileNotFoundException
+import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.core.prefs.AppSettings
+import org.koitharu.kotatsu.core.ui.BaseViewModel
+import org.koitharu.kotatsu.core.util.ext.MutableEventFlow
+import org.koitharu.kotatsu.core.util.ext.call
+import org.koitharu.kotatsu.local.data.LocalStorageManager
+import javax.inject.Inject
+
+@HiltViewModel
+class MangaDirectorySelectViewModel @Inject constructor(
+	private val storageManager: LocalStorageManager,
+	private val settings: AppSettings,
+) : BaseViewModel() {
+
+	val items = MutableStateFlow(emptyList<DirectoryModel>())
+	val onDismissDialog = MutableEventFlow<Unit>()
+	val onPickDirectory = MutableEventFlow<Unit>()
+
+	init {
+		launchJob {
+			val defaultValue = storageManager.getDefaultWriteableDir()
+			val available = storageManager.getWriteableDirs()
+			items.value = buildList(available.size + 1) {
+				available.mapTo(this) { dir ->
+					DirectoryModel(
+						title = storageManager.getDirectoryDisplayName(dir, isFullPath = false),
+						titleRes = 0,
+						file = dir,
+						isChecked = dir == defaultValue,
+					)
+				}
+				this += DirectoryModel(
+					title = null,
+					titleRes = R.string.pick_custom_directory,
+					file = null,
+					isChecked = false,
+				)
+			}
+		}
+	}
+
+	fun onItemClick(item: DirectoryModel) {
+		if (item.file != null) {
+			settings.mangaStorageDir = item.file
+			onDismissDialog.call(Unit)
+		} else {
+			onPickDirectory.call(Unit)
+		}
+	}
+
+	fun onCustomDirectoryPicked(uri: Uri) {
+		launchJob(Dispatchers.Default) {
+			storageManager.takePermissions(uri)
+			val dir = storageManager.resolveUri(uri) ?: throw FileNotFoundException()
+			if (!dir.canWrite()) {
+				throw AccessDeniedException(dir)
+			}
+			settings.userSpecifiedMangaDirectories += dir
+			settings.mangaStorageDir = dir
+			onDismissDialog.call(Unit)
+		}
+	}
+}

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

@@ -0,0 +1,34 @@
+package org.koitharu.kotatsu.settings.storage
+
+import android.content.Context
+import android.content.Intent
+import android.os.Build
+import android.os.Environment
+import android.provider.Settings
+import androidx.activity.result.contract.ActivityResultContract
+import androidx.annotation.RequiresApi
+import androidx.core.net.toUri
+
+
+@RequiresApi(Build.VERSION_CODES.R)
+class RequestStorageManagerPermissionContract : ActivityResultContract<String, Boolean>() {
+
+	override fun createIntent(context: Context, input: String): Intent {
+		val intent = Intent(Settings.ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION)
+		intent.addCategory("android.intent.category.DEFAULT")
+		intent.data = "package:${context.packageName}".toUri()
+		return intent
+	}
+
+	override fun parseResult(resultCode: Int, intent: Intent?): Boolean {
+		return Environment.isExternalStorageManager()
+	}
+
+	override fun getSynchronousResult(context: Context, input: String): SynchronousResult<Boolean>? {
+		return if (Environment.isExternalStorageManager()) {
+			SynchronousResult(true)
+		} else {
+			null
+		}
+	}
+}

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

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.recyclerview.widget.RecyclerView
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:app="http://schemas.android.com/apk/res-auto"
+	xmlns:tools="http://schemas.android.com/tools"
+	android:id="@+id/recyclerView"
+	android:layout_width="match_parent"
+	android:layout_height="wrap_content"
+	android:orientation="vertical"
+	android:scrollIndicators="top|bottom"
+	android:scrollbars="vertical"
+	app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
+	tools:ignore="UnusedAttribute" />

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

@@ -1,48 +1,46 @@
 <?xml version="1.0" encoding="utf-8"?>
-<RelativeLayout
+<LinearLayout
 	xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="wrap_content"
 	android:background="?selectableItemBackground"
-	android:minHeight="?listPreferredItemHeightLarge"
+	android:gravity="center_vertical"
+	android:minHeight="?listPreferredItemHeight"
+	android:orientation="horizontal"
+	android:paddingVertical="12dp"
 	android:paddingStart="?listPreferredItemPaddingStart"
-	android:paddingTop="16dp"
+	android:paddingEnd="?listPreferredItemPaddingEnd">
-	android:paddingEnd="?listPreferredItemPaddingEnd"
-	android:paddingBottom="16dp">
 
 	<org.koitharu.kotatsu.core.ui.widgets.CheckableImageView
 		android:id="@+id/imageView_indicator"
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
-		android:layout_alignParentStart="true"
-		android:layout_centerVertical="true"
 		android:src="?android:listChoiceIndicatorSingle"
 		tools:ignore="TouchTargetSizeCheck" />
 
-	<TextView
+	<LinearLayout
-		android:id="@+id/textView_title"
+		android:layout_width="match_parent"
-		android:layout_width="0dp"
 		android:layout_height="wrap_content"
-		android:layout_alignParentEnd="true"
 		android:layout_marginStart="?listPreferredItemPaddingStart"
-		android:layout_toEndOf="@id/imageView_indicator"
+		android:orientation="vertical">
-		android:ellipsize="end"
-		android:maxLines="1"
-		android:textAppearance="?attr/textAppearanceTitleSmall"
-		tools:text="@tools:sample/lorem[3]" />
 
-	<TextView
+		<TextView
-		android:id="@+id/textView_subtitle"
+			android:id="@+id/textView_title"
-		android:layout_width="0dp"
+			android:layout_width="match_parent"
-		android:layout_height="wrap_content"
+			android:layout_height="wrap_content"
-		android:layout_below="@id/textView_title"
+			android:ellipsize="end"
-		android:layout_alignParentEnd="true"
+			android:singleLine="true"
-		android:layout_marginStart="?listPreferredItemPaddingStart"
+			android:textAppearance="?attr/textAppearanceTitleSmall"
-		android:layout_marginTop="6dp"
+			tools:text="@tools:sample/lorem[3]" />
-		android:layout_toEndOf="@id/imageView_indicator"
-		android:ellipsize="end"
-		android:textAppearance="?attr/textAppearanceBodyMedium"
-		tools:text="@tools:sample/lorem[20]" />
 
-</RelativeLayout>
+		<TextView
+			android:id="@+id/textView_subtitle"
+			android:layout_width="match_parent"
+			android:layout_height="wrap_content"
+			android:layout_marginTop="6dp"
+			android:textAppearance="?attr/textAppearanceBodyMedium"
+			tools:text="@tools:sample/lorem[20]" />
+
+	</LinearLayout>
+</LinearLayout>

app/src/main/res/values/strings.xml

@@ -445,4 +445,7 @@
 	<string name="download_option_all_unread">All unread chapters</string>
 	<string name="download_option_all_unread_b">All unread chapters (%s)</string>
 	<string name="download_option_manual_selection">Select chapters manually</string>
+	<string name="custom_directory">Custom directory</string>
+	<string name="pick_custom_directory">Pick custom directory</string>
+	<string name="no_access_to_file">You have no access to this file or directory</string>
 </resources>