feat(travel): Enhance MTR arrival handling with retry logic and improve UI update efficiency

main/ui/apps/travel/ui/main.cpp

@@ -167,8 +167,11 @@ void MainUI::update_arrivals(const std::vector<RouteArrivalData>& arrival_data)
     if (i < static_cast<int>(arrival_data.size())) {
       update_route_display_(route_displays_[i], arrival_data[i]);
     } else {
-      // Hide unused route displays
-      lv_obj_add_flag(route_displays_[i].container, LV_OBJ_FLAG_HIDDEN);
+      // Hide unused route displays if currently visible
+      if (route_displays_[i].cached_visible) {
+        lv_obj_add_flag(route_displays_[i].container, LV_OBJ_FLAG_HIDDEN);
+        route_displays_[i].cached_visible = false;
+      }
     }
   }
 
@@ -176,37 +179,59 @@ void MainUI::update_arrivals(const std::vector<RouteArrivalData>& arrival_data)
 }
 
 void MainUI::update_route_display_(RouteDisplay& display, const RouteArrivalData& data) {
-  lv_obj_clear_flag(display.container, LV_OBJ_FLAG_HIDDEN);
+  // Show container if hidden
+  if (!display.cached_visible) {
+    lv_obj_clear_flag(display.container, LV_OBJ_FLAG_HIDDEN);
+    display.cached_visible = true;
+  }
 
   // Update header with line color
   std::string header_text = data.route.station_name + " → " + data.route.direction_name;
-  lv_label_set_text(display.header, header_text.c_str());
+  if (header_text != display.cached_header_text) {
+    lv_label_set_text(display.header, header_text.c_str());
+    display.cached_header_text = header_text;
+  }
 
   if (!data.route.line_color.empty()) {
     lv_color_t line_color = hex_to_lv_color_(data.route.line_color);
     lv_obj_set_style_text_color(display.header, line_color, 0);
   }
 
-  // Update arrival labels
+  // Update arrival labels - only if text changed
   for (int i = 0; i < MAX_ARRIVALS_PER_ROUTE; i++) {
-    if (i < static_cast<int>(data.arrivals.size())) {
+    std::string arrival_text = "";
+    bool should_show = (i < static_cast<int>(data.arrivals.size()));
+
+    if (should_show) {
       const auto& arrival = data.arrivals[i];
-      std::string arrival_text = "  " + arrival.arrival_time;
+      arrival_text = "  " + arrival.arrival_time;
       if (!arrival.arrival_time_full.empty()) {
         arrival_text += " (" + arrival.arrival_time_full + ")";
       }
       arrival_text += " " + arrival.direction;
+    }
+
+    if (arrival_text != display.cached_arrival_texts[i]) {
       lv_label_set_text(display.arrival_labels[i], arrival_text.c_str());
-      lv_obj_clear_flag(display.arrival_labels[i], LV_OBJ_FLAG_HIDDEN);
+      display.cached_arrival_texts[i] = arrival_text;
+    }
+
+    // Handle visibility
+    if (should_show) {
+      if (lv_obj_has_flag(display.arrival_labels[i], LV_OBJ_FLAG_HIDDEN)) {
+        lv_obj_clear_flag(display.arrival_labels[i], LV_OBJ_FLAG_HIDDEN);
+      }
     } else {
-      lv_label_set_text(display.arrival_labels[i], "");
-      lv_obj_add_flag(display.arrival_labels[i], LV_OBJ_FLAG_HIDDEN);
+      if (!lv_obj_has_flag(display.arrival_labels[i], LV_OBJ_FLAG_HIDDEN)) {
+        lv_obj_add_flag(display.arrival_labels[i], LV_OBJ_FLAG_HIDDEN);
+      }
     }
   }
 
   // Show error if any
   if (!data.is_valid && !data.error_message.empty()) {
-    lv_label_set_text(display.arrival_labels[0], ("  錯誤: " + data.error_message).c_str());
+    std::string error_text = "  錯誤: " + data.error_message;
+    lv_label_set_text(display.arrival_labels[0], error_text.c_str());
     lv_obj_clear_flag(display.arrival_labels[0], LV_OBJ_FLAG_HIDDEN);
   }
 }

main/ui/apps/travel/ui/main.h

@@ -43,6 +43,11 @@ private:
     lv_obj_t* container = nullptr;
     lv_obj_t* header = nullptr;
     lv_obj_t* arrival_labels[3] = {nullptr, nullptr, nullptr};  // Show up to 3 arrivals per route
+
+    // Cached values for change detection
+    std::string cached_header_text;
+    std::string cached_arrival_texts[3];
+    bool cached_visible = false;
   };
   RouteDisplay route_displays_[5];
 

main/ui/apps/travel/ui/main_handler.cpp

@@ -258,7 +258,18 @@ std::string MainUIHandler::format_arrival_time_(const std::string& api_time) {
     return time_part;
   }
 
-  return api_time;
+  // Try to find HH:MM pattern in the string
+  for (size_t i = 0; i < api_time.length() - 5; i++) {
+    if (api_time[i] == ':' && i > 0 && i < api_time.length() - 3) {
+      std::string candidate = api_time.substr(i - 2, 5);
+      if (isdigit(candidate[0]) && isdigit(candidate[1]) && candidate[2] == ':' &&
+          isdigit(candidate[3]) && isdigit(candidate[4])) {
+        return candidate;
+      }
+    }
+  }
+
+  return "";  // Return empty instead of raw input
 }
 
 std::string MainUIHandler::format_arrival_time_full_(const std::string& api_time) {
@@ -280,8 +291,8 @@ std::string MainUIHandler::get_current_time_string_() {
   auto now = std::time(nullptr);
   auto tm = *std::localtime(&now);
 
-  char buffer[9];  // HH:MM:SS\0
-  strftime(buffer, sizeof(buffer), "%H:%M:%S", &tm);
+  char buffer[6];  // HH:MM\0
+  strftime(buffer, sizeof(buffer), "%H:%M", &tm);
   return std::string(buffer);
 }