diff --git a/src/main/java/eu/siacs/conversations/ui/ConversationFragment.java b/src/main/java/eu/siacs/conversations/ui/ConversationFragment.java
index 9ad7caed5..bf9aa93d3 100644
--- a/src/main/java/eu/siacs/conversations/ui/ConversationFragment.java
+++ b/src/main/java/eu/siacs/conversations/ui/ConversationFragment.java
@@ -135,6 +135,8 @@ import static eu.siacs.conversations.utils.PermissionUtils.allGranted;
 import static eu.siacs.conversations.utils.PermissionUtils.getFirstDenied;
 import static eu.siacs.conversations.utils.PermissionUtils.writeGranted;
 
+import org.jetbrains.annotations.NotNull;
+
 
 public class ConversationFragment extends XmppFragment implements EditMessage.KeyboardListener, MessageAdapter.OnContactPictureLongClicked, MessageAdapter.OnContactPictureClicked {
 
@@ -1692,7 +1694,7 @@ public class ConversationFragment extends XmppFragment implements EditMessage.Ke
         this.activity.xmppConnectionService.updateConversation(conversation);
         this.activity.onConversationsListItemUpdated();
         refresh();
-        getActivity().invalidateOptionsMenu();
+        requireActivity().invalidateOptionsMenu();
     }
 
 
@@ -1702,9 +1704,7 @@ public class ConversationFragment extends XmppFragment implements EditMessage.Ke
         switch (attachmentChoice) {
             case ATTACHMENT_CHOICE_CHOOSE_IMAGE:
                 intent.setAction(Intent.ACTION_GET_CONTENT);
-                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
-                    intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
-                }
+                intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
                 intent.setType("image/*");
                 chooser = true;
                 break;
@@ -1722,9 +1722,7 @@ public class ConversationFragment extends XmppFragment implements EditMessage.Ke
             case ATTACHMENT_CHOICE_CHOOSE_FILE:
                 chooser = true;
                 intent.setType("*/*");
-                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
-                    intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
-                }
+                intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
                 intent.addCategory(Intent.CATEGORY_OPENABLE);
                 intent.setAction(Intent.ACTION_GET_CONTENT);
                 break;
@@ -1807,7 +1805,7 @@ public class ConversationFragment extends XmppFragment implements EditMessage.Ke
     }
 
     private void showErrorMessage(final Message message) {
-        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
+        AlertDialog.Builder builder = new AlertDialog.Builder(requireActivity());
         builder.setTitle(R.string.error_message);
         final String errorMessage = message.getErrorMessage();
         final String[] errorMessageParts = errorMessage == null ? new String[0] : errorMessage.split("\\u001f");
@@ -1828,7 +1826,7 @@ public class ConversationFragment extends XmppFragment implements EditMessage.Ke
 
 
     private void deleteFile(final Message message) {
-        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
+        AlertDialog.Builder builder = new AlertDialog.Builder(requireActivity());
         builder.setNegativeButton(R.string.cancel, null);
         builder.setTitle(R.string.delete_file_dialog);
         builder.setMessage(R.string.delete_file_dialog_msg);
@@ -1962,7 +1960,7 @@ public class ConversationFragment extends XmppFragment implements EditMessage.Ke
     }
 
     @Override
-    public void onSaveInstanceState(Bundle outState) {
+    public void onSaveInstanceState(@NotNull Bundle outState) {
         super.onSaveInstanceState(outState);
         if (conversation != null) {
             outState.putString(STATE_CONVERSATION_UUID, conversation.getUuid());