From f567b03be5d767f17cf82e3b6bdbfc5f3dfcbb22 Mon Sep 17 00:00:00 2001
From: Dennis Guse <dennis.guse@alumni.tu-berlin.de>
Date: Sun, 11 Sep 2022 14:37:35 +0200
Subject: [PATCH] Bugfix: import all crashed with ClassCastException.

---
 .../opentracks/io/file/importer/ImportViewModel.java   | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/main/java/de/dennisguse/opentracks/io/file/importer/ImportViewModel.java b/src/main/java/de/dennisguse/opentracks/io/file/importer/ImportViewModel.java
index 0ad2f806b..2d445a33e 100644
--- a/src/main/java/de/dennisguse/opentracks/io/file/importer/ImportViewModel.java
+++ b/src/main/java/de/dennisguse/opentracks/io/file/importer/ImportViewModel.java
@@ -11,7 +11,6 @@ import androidx.lifecycle.LiveData;
 import androidx.lifecycle.MutableLiveData;
 
 import java.util.ArrayList;
-import java.util.Collection;
 import java.util.List;
 import java.util.stream.Collectors;
 
@@ -48,7 +47,14 @@ public class ImportViewModel extends AndroidViewModel implements ImportServiceRe
     }
 
     private void loadData(List<DocumentFile> documentFiles) {
-        List<DocumentFile> fileList = documentFiles.stream().map(FileUtils::getFiles).flatMap(Collection::stream).collect(Collectors.toList());
+        List<ArrayList<DocumentFile>> nestedFileList = documentFiles.stream()
+                .map(FileUtils::getFiles)
+                // TODO flatMap(Collection::stream) fails with ClassCastException; try in the future again
+                .collect(Collectors.toList());
+
+        List<DocumentFile> fileList = new ArrayList<>();
+        nestedFileList.forEach(fileList::addAll);
+
         summary.totalCount = fileList.size();
         filesToImport.addAll(fileList);
         importNextFile();