(#10, #11) Add minor code improvements

Author: LaksCastro

android/src/main/kotlin/io/lakscastro/sharedstorage/saf/DocumentFileApi.kt

@@ -6,6 +6,7 @@ import android.os.Build
 import android.provider.DocumentsContract
 import android.util.Log
 import androidx.annotation.RequiresApi
+import androidx.documentfile.provider.DocumentFile
 import io.flutter.plugin.common.*
 import io.flutter.plugin.common.EventChannel.StreamHandler
 import io.lakscastro.sharedstorage.ROOT_CHANNEL
@@ -15,6 +16,7 @@ import io.lakscastro.sharedstorage.saf.utils.*
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
+import java.io.File
 
 internal class DocumentFileApi(private val plugin: SharedStoragePlugin) :
   MethodChannel.MethodCallHandler,
@@ -173,8 +175,7 @@ internal class DocumentFileApi(private val plugin: SharedStoragePlugin) :
           val uri = call.argument<String>("uri")!!
           val parent = documentFromTreeUri(plugin.context, uri)?.parentFile
 
-          if (parent != null)
-            result.success(createDocumentFileMap(parent))
+          result.success(if (parent != null) createDocumentFileMap(parent) else null)
         }
       }
       else -> result.notImplemented()

example/lib/list_files.dart

@@ -117,7 +117,7 @@ class _FileTileState extends State<FileTile> {
       height: _size.height,
     );
 
-    if (bitmap == null) return;
+    if (bitmap == null || !mounted) return;
 
     setState(() => imageBytes = bitmap.bytes);
   }

lib/src/storage_access_framework/saf.dart

@@ -12,14 +12,18 @@ import 'package:shared_storage/src/storage_access_framework/uri_permission.dart'
 ///
 /// [Refer to details](https://developer.android.com/reference/android/content/Intent#ACTION_OPEN_DOCUMENT_TREE)
 ///
-/// TODO: Implement [initialDir] param to
 /// support the initial directory of the directory picker
-Future<Uri?> openDocumentTree({bool grantWritePermission = true}) async {
+Future<Uri?> openDocumentTree(
+    {bool grantWritePermission = true, Uri? initialUri}) async {
   const kOpenDocumentTree = 'openDocumentTree';
 
   const kGrantWritePermission = 'grantWritePermission';
+  const kInitialUri = 'initialUri';
 
-  final args = <String, dynamic>{kGrantWritePermission: grantWritePermission};
+  final args = <String, dynamic>{
+    kGrantWritePermission: grantWritePermission,
+    kInitialUri: '$initialUri'
+  };
 
   final selectedDirectoryUri =
       await kDocumentFileChannel.invokeMethod<String?>(kOpenDocumentTree, args);