fixed failing scan of items copied to SD card on older devices

CHANGELOG.md

@@ -16,6 +16,7 @@ All notable changes to this project will be documented in this file.
 ### Fixed
 
 - rendering of panoramas with inconsistent metadata
+- failing scan of items copied to SD card on older devices
 
 ## <a id="v1.7.1"></a>[v1.7.1] - 2022-10-09
 

android/app/src/main/kotlin/deckers/thibault/aves/model/provider/MediaStoreImageProvider.kt

@@ -32,6 +32,7 @@ import java.io.File
 import java.io.OutputStream
 import java.util.*
 import java.util.concurrent.CompletableFuture
+import kotlin.coroutines.Continuation
 import kotlin.coroutines.resume
 import kotlin.coroutines.resumeWithException
 import kotlin.coroutines.suspendCoroutine
@@ -784,7 +785,29 @@ class MediaStoreImageProvider : ImageProvider() {
     }
 
     suspend fun scanNewPath(context: Context, path: String, mimeType: String): FieldMap =
-        suspendCoroutine { cont ->
+        suspendCoroutine { cont -> tryScanNewPath(context, path = path, mimeType = mimeType, cont) }
+
+    private fun tryScanNewPath(context: Context, path: String, mimeType: String, cont: Continuation<FieldMap>, iteration: Int = 0) {
+        // `scanFile` may (e.g. when copying to SD card on Android 10 (API 29)):
+        // 1) yield no URI,
+        // 2) yield a temporary URI that fails when queried,
+        // 3) yield a temporary URI that succeeds when queried right away, but the Media Store actually won't have an entry for it until device reboot.
+        if (iteration > 5) {
+            // give up
+            cont.resumeWithException(Exception("failed to scan new path=$path after $iteration iterations"))
+            return
+        } else if (iteration > 0) {
+            // waiting and retrying just once usually works out for cases 1) and 2)
+            Thread.sleep(iteration * 100L)
+        } else if (iteration == 0 && Build.VERSION.SDK_INT < Build.VERSION_CODES.R) {
+            // waiting before the first scan usually works out for case 3)
+            StorageUtils.getVolumePath(context, path)?.let { volumePath ->
+                if (volumePath != StorageUtils.getPrimaryVolumePath(context)) {
+                    Thread.sleep(100L)
+                }
+            }
+        }
+
         MediaScannerConnection.scanFile(context, arrayOf(path), arrayOf(mimeType)) { _, newUri: Uri? ->
             fun scanUri(uri: Uri?): FieldMap? {
                 uri ?: return null
@@ -830,12 +853,11 @@ class MediaStoreImageProvider : ImageProvider() {
 
                 if (newFields != null) {
                     cont.resume(newFields)
-                    } else {
-                        cont.resumeWithException(Exception("failed to get item details from provider at contentUri=$contentUri (from newUri=$newUri)"))
+                    return@scanFile
                 }
-                } else {
-                    cont.resumeWithException(Exception("failed to get URI of item at path=$path"))
             }
+
+            tryScanNewPath(context, path = path, mimeType = mimeType, cont, iteration + 1)
         }
     }
 

pubspec.lock

@@ -14,7 +14,7 @@ packages:
       name: _flutterfire_internals
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.4"
+    version: "1.0.5"
   analyzer:
     dependency: transitive
     description:
@@ -126,14 +126,14 @@ packages:
       name: cloud_firestore_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "5.8.1"
+    version: "5.8.2"
   cloud_firestore_web:
     dependency: transitive
     description:
       name: cloud_firestore_web
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.0.1"
+    version: "3.0.2"
   collection:
     dependency: "direct main"
     description:
@@ -147,7 +147,7 @@ packages:
       name: connectivity_plus
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.0.1"
+    version: "3.0.2"
   connectivity_plus_platform_interface:
     dependency: transitive
     description:
@@ -284,7 +284,7 @@ packages:
       name: firebase_core
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.1.0"
   firebase_core_platform_interface:
     dependency: transitive
     description:
@@ -305,14 +305,14 @@ packages:
       name: firebase_crashlytics
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.0.1"
+    version: "3.0.2"
   firebase_crashlytics_platform_interface:
     dependency: transitive
     description:
       name: firebase_crashlytics_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.3.2"
+    version: "3.3.3"
   flex_color_picker:
     dependency: "direct main"
     description:
@@ -545,7 +545,7 @@ packages:
       name: lints
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.0.1"
   lists:
     dependency: transitive
     description:
@@ -724,7 +724,7 @@ packages:
       name: pdf
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.8.3"
+    version: "3.8.4"
   percent_indicator:
     dependency: "direct main"
     description: