From 6c16bdc444e99ea00d743c806daf4cdc4d6ce344 Mon Sep 17 00:00:00 2001
From: 2bllw8 <2bllw8@gmail.com>
Date: Tue, 3 May 2022 10:14:59 +0200
Subject: [PATCH] Add isChild support to FileSystemProvider

Issue #24
---
 .../anemo/documents/provider/AnemoDocumentProvider.java      | 1 +
 .../bbllw8/anemo/documents/provider/FileSystemProvider.java  | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/app/src/main/java/exe/bbllw8/anemo/documents/provider/AnemoDocumentProvider.java b/app/src/main/java/exe/bbllw8/anemo/documents/provider/AnemoDocumentProvider.java
index b99a0fc..d735eb7 100644
--- a/app/src/main/java/exe/bbllw8/anemo/documents/provider/AnemoDocumentProvider.java
+++ b/app/src/main/java/exe/bbllw8/anemo/documents/provider/AnemoDocumentProvider.java
@@ -83,6 +83,7 @@ public Cursor queryRoots(String[] projection) {
 
         int flags = Root.FLAG_LOCAL_ONLY;
         flags |= Root.FLAG_SUPPORTS_CREATE;
+        flags |= Root.FLAG_SUPPORTS_IS_CHILD;
         flags |= DocumentsContract.Root.FLAG_SUPPORTS_EJECT;
         if (Build.VERSION.SDK_INT >= 29) {
             flags |= Root.FLAG_SUPPORTS_SEARCH;
diff --git a/app/src/main/java/exe/bbllw8/anemo/documents/provider/FileSystemProvider.java b/app/src/main/java/exe/bbllw8/anemo/documents/provider/FileSystemProvider.java
index 2f801a9..4166862 100644
--- a/app/src/main/java/exe/bbllw8/anemo/documents/provider/FileSystemProvider.java
+++ b/app/src/main/java/exe/bbllw8/anemo/documents/provider/FileSystemProvider.java
@@ -385,6 +385,11 @@ public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs)
         return result;
     }
 
+    @Override
+    public boolean isChildDocument(String parentDocumentId, String documentId) {
+        return documentId.contains(parentDocumentId);
+    }
+
     /**
      * Callback indicating that the given document has been modified. This gives the provider a hook
      * to invalidate cached data, such as {@code sdcardfs}.