Fixing annotation for optional OCFile parameter

Changing to OCFile? is required, as the parameter is indeed nullable.
This didn't turn up prior to the rebase nor was it flagged in the
pre-existing code, even though it is already an issue there.
What probably happened is a combination of updated detection tools and
the tools purposefully only flagging changed lines.

Additionally, the nullness annotation was added to the underlying Java
calls, to make sure the Kotlin type definition holds true.

Signed-off-by: Philipp Hasper <[email protected]>

Author: PhilLab

app/src/main/java/com/owncloud/android/ui/activity/FolderPickerActivity.kt

@@ -357,7 +357,7 @@ open class FolderPickerActivity :
             }
         }
 
-    private fun refreshListOfFilesFragment(directory: OCFile) {
+    private fun refreshListOfFilesFragment(directory: OCFile?) {
         listOfFilesFragment?.listDirectory(directory, false)
     }
 

app/src/main/java/com/owncloud/android/ui/fragment/OCFileListFragment.java

@@ -1474,11 +1474,11 @@ public void refreshDirectory() {
         }
     }
 
-    public void listDirectory(OCFile directory, boolean onlyOnDevice) {
+    public void listDirectory(@Nullable OCFile directory, boolean onlyOnDevice) {
         listDirectory(directory, null, onlyOnDevice);
     }
 
-    private OCFile getDirectoryForListDirectory(OCFile directory, FileDataStorageManager storageManager) {
+    private OCFile getDirectoryForListDirectory(@Nullable OCFile directory, FileDataStorageManager storageManager) {
         if (directory == null) {
             if (mFile != null) {
                 directory = mFile;
@@ -1502,7 +1502,7 @@ private OCFile getDirectoryForListDirectory(OCFile directory, FileDataStorageMan
      *
      * @param directory File to be listed
      */
-    public void listDirectory(OCFile directory, OCFile file, boolean onlyOnDevice) {
+    public void listDirectory(@Nullable OCFile directory, OCFile file, boolean onlyOnDevice) {
         if (!searchFragment) {
             FileDataStorageManager storageManager = mContainerActivity.getStorageManager();
             if (storageManager == null) {