Best effort for devices without DocumentsUI

app/src/main/kotlin/com/hippo/ehviewer/ui/settings/DownloadScreen.kt

@@ -1,7 +1,10 @@
 package com.hippo.ehviewer.ui.settings
 
+import android.Manifest
+import android.content.ActivityNotFoundException
 import android.content.Intent.FLAG_GRANT_READ_URI_PERMISSION
 import android.content.Intent.FLAG_GRANT_WRITE_URI_PERMISSION
+import android.os.Environment
 import android.provider.DocumentsContract
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.contract.ActivityResultContracts
@@ -54,11 +57,14 @@ import com.hippo.ehviewer.ui.tools.rememberedAccessor
 import com.hippo.ehviewer.util.AppConfig
 import com.hippo.ehviewer.util.displayPath
 import com.hippo.ehviewer.util.displayString
+import com.hippo.ehviewer.util.isAtLeastQ
+import com.hippo.ehviewer.util.requestPermission
 import com.hippo.files.delete
 import com.hippo.files.find
 import com.hippo.files.isDirectory
 import com.hippo.files.list
 import com.hippo.files.metadataOrNull
+import com.hippo.files.mkdirs
 import com.hippo.files.toOkioPath
 import com.hippo.files.toUri
 import com.ramcosta.composedestinations.annotation.Destination
@@ -132,7 +138,24 @@ fun AnimatedVisibilityScope.DownloadScreen(navigator: DestinationsNavigator) = c
                             Text(stringResource(id = R.string.default_download_dir_not_empty))
                         }
                     }
-                    selectDownloadDirLauncher.launch(null)
+                    try {
+                        selectDownloadDirLauncher.launch(null)
+                    } catch (_: ActivityNotFoundException) {
+                        // Best effort for devices without DocumentsUI
+                        if (!isAtLeastQ && requestPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
+                            runCatching {
+                                val path = Environment.getExternalStorageDirectory().toOkioPath() / AppConfig.APP_DIRNAME
+                                path.mkdirs()
+                                check(path.isDirectory) { "$path is not a directory" }
+                                keepNoMediaFileStatus(path) // Check if the directory is writable
+                                downloadLocationState = path
+                                return@launchIO
+                            }.onFailure {
+                                logcat(it)
+                            }
+                        }
+                        launchSnackBar(cannotGetDownloadLocation)
+                    }
                 }
             }
             val mediaScan = Settings::mediaScan.observed