Add @mentions autocomplete in group chat compose

[Copilot]

When drafting a message in a group chat, typing @ now shows an inline autocomplete list of group members filtered in real-time as you continue typing. Selecting a suggestion inserts @DisplayName at the cursor position.

Changes

• conversation_activity.xml — Added a RecyclerView (mention_suggestions) above the input panel, hidden by default
• mention_list_item.xml (new) — List item layout showing a circular contact avatar, member display name, and email address
• MentionAdapter.java (new) — RecyclerView adapter backing the suggestion list; loads contact avatars via AvatarImageView and Glide; exposes OnMentionClickListener for selection callbacks
• ConversationActivity.java:
  • updateMentionSuggestions() — runs on every afterTextChanged, detects @<query> before the cursor, filters chat members by display name or address, shows/hides the list
  • insertMention(DcContact) — replaces the @<query> span with @DisplayName and advances the cursor
  • Only active in multi-user chats (dcChat.isMultiUser()); list hides when a space/newline follows @ or no members match

Example flow

User types: "Hey @ali"
→ suggestion list shows contacts (with avatars) whose name/address contains "ali"
User taps "Alice Smith"
→ text becomes: "Hey @Alice Smith "

Original prompt

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This section details on the original issue you should resolve

<issue_title>add @mentions support/auto-completion when drafting a message</issue_title>
<issue_description>similar to Telegram app, when user is writing a message they should be able to get mention auto-completion with the memberlist of the current group chat when typing @ </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes add @mentions support/auto-completion when drafting a message #124

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[adbenitez]

@copilot in the completion list the avatar of the contacts should also be displayed at the start in front of the name

[Copilot]

@copilot in the completion list the avatar of the contacts should also be displayed at the start in front of the name

Done in d8ba265. Each suggestion row now shows a circular avatar (32dp) before the contact name, loaded via AvatarImageView with Glide — including fallback generated avatars when no photo is set.

Warning

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