Avoid crashing if storage directory can't be read

e.g. when first launching and there's no storage permissions yet.

app/src/main/java/eu/kanade/tachiyomi/App.kt

@@ -87,8 +87,8 @@ class App : Application(), DefaultLifecycleObserver, ImageLoaderFactory {
             if (packageName != process) WebView.setDataDirectorySuffix(process)
         }
 
-        Injekt.importModule(AppModule(this))
         Injekt.importModule(PreferenceModule(this))
+        Injekt.importModule(AppModule(this))
         Injekt.importModule(DomainModule())
 
         setupAcra()

app/src/main/java/eu/kanade/tachiyomi/data/download/DownloadCache.kt

@@ -297,8 +297,11 @@ class DownloadCache(
      * Returns the downloads directory from the user's preferences.
      */
     private fun getDirectoryFromPreference(): UniFile {
-        return UniFile.fromUri(context, storagePreferences.baseStorageDirectory().get().toUri())
-            .createDirectory(StoragePreferences.DOWNLOADS_DIR)
+        return storagePreferences.baseStorageDirectory().get().let {
+            UniFile.fromUri(context, it.toUri()).also {
+                it?.createDirectory(StoragePreferences.DOWNLOADS_DIR)
+            }
+        }
     }
 
     /**

app/src/main/java/eu/kanade/tachiyomi/data/download/DownloadProvider.kt

@@ -5,9 +5,6 @@ import androidx.core.net.toUri
 import com.hippo.unifile.UniFile
 import eu.kanade.tachiyomi.source.Source
 import eu.kanade.tachiyomi.util.storage.DiskUtil
-import kotlinx.coroutines.MainScope
-import kotlinx.coroutines.flow.launchIn
-import kotlinx.coroutines.flow.onEach
 import logcat.LogPriority
 import tachiyomi.core.i18n.stringResource
 import tachiyomi.core.util.system.logcat
@@ -29,27 +26,14 @@ class DownloadProvider(
     private val storagePreferences: StoragePreferences = Injekt.get(),
 ) {
 
-    private val scope = MainScope()
-
-    /**
-     * The root directory for downloads.
-     */
-    private var downloadsDir = setDownloadsLocation()
-
-    init {
-        storagePreferences.baseStorageDirectory().changes()
-            .onEach { downloadsDir = setDownloadsLocation() }
-            .launchIn(scope)
-    }
-
-    private fun setDownloadsLocation(): UniFile {
-        return storagePreferences.baseStorageDirectory().get().let {
-            val dir = UniFile.fromUri(context, it.toUri())
-                .createDirectory(StoragePreferences.DOWNLOADS_DIR)
-            DiskUtil.createNoMediaFile(dir, context)
-            dir
+    private val downloadsDir: UniFile?
+        get() = storagePreferences.baseStorageDirectory().get().let {
+            UniFile.fromUri(context, it.toUri())
+                ?.createDirectory(StoragePreferences.DOWNLOADS_DIR)
+                ?.also { dir ->
+                    DiskUtil.createNoMediaFile(dir, context)
+                }
         }
-    }
 
     /**
      * Returns the download directory for a manga. For internal use only.
@@ -59,12 +43,12 @@ class DownloadProvider(
      */
     internal fun getMangaDir(mangaTitle: String, source: Source): UniFile {
         try {
-            return downloadsDir
+            return downloadsDir!!
                 .createDirectory(getSourceDirName(source))
                 .createDirectory(getMangaDirName(mangaTitle))
         } catch (e: Throwable) {
             logcat(LogPriority.ERROR, e) { "Invalid download directory" }
-            throw Exception(context.stringResource(MR.strings.invalid_location, downloadsDir))
+            throw Exception(context.stringResource(MR.strings.invalid_location, downloadsDir ?: ""))
         }
     }
 
@@ -74,7 +58,7 @@ class DownloadProvider(
      * @param source the source to query.
      */
     fun findSourceDir(source: Source): UniFile? {
-        return downloadsDir.findFile(getSourceDirName(source), true)
+        return downloadsDir?.findFile(getSourceDirName(source), true)
     }
 
     /**