add UI and logic UI

Assets/Scripts/ChatInputHandler.cs

@@ -72,6 +72,8 @@ namespace BrewMonster.Scripts.ChatUI
         private void OnDestroy()
         {
             EventBus.Unsubscribe<WhisperPlayerEvent>(OnWhisperPlayerEvent);
+            if (inputField != null)
+                inputField.onSubmit.RemoveListener(OnSubmit);
         }
 
         private void OnWhisperPlayerEvent(WhisperPlayerEvent e)
@@ -81,7 +83,9 @@ namespace BrewMonster.Scripts.ChatUI
 
         private void Start()
         {
-            inputField.onSubmit.AddListener(OnSubmit);
+            // PC / Editor: Enter submits. Android: only sendButton → SubmitFromSendButton (no onSubmit).
+            if (inputField != null && Application.platform != RuntimePlatform.Android)
+                inputField.onSubmit.AddListener(OnSubmit);
 
             foreach (var mapping in channelButtons)
             {
@@ -200,6 +204,15 @@ namespace BrewMonster.Scripts.ChatUI
             OnCommand_speak(text);
         }
 
+        /// <summary>
+        /// Gọi từ nút Send trên UI. Trên Android đây là cách gửi duy nhất (không dùng Enter).
+        /// </summary>
+        public void SubmitFromSendButton()
+        {
+            if (inputField == null) return;
+            OnSubmit(inputField.text);
+        }
+
         // =====================================================
         // PORT C++: CDlgChat::OnCommand_speak
         // =====================================================