Implement StringSerializer

Author: swift-kim

shell/platform/tizen/channels/lifecycle_channel.cc

@@ -4,8 +4,9 @@
 
 #include "lifecycle_channel.h"
 
+#include <variant>
+
 #include "flutter/shell/platform/common/client_wrapper/include/flutter/standard_message_codec.h"
-#include "flutter/shell/platform/tizen/flutter_tizen_engine.h"
 #include "flutter/shell/platform/tizen/tizen_log.h"
 
 namespace flutter {
@@ -19,13 +20,38 @@ constexpr char kResumed[] = "AppLifecycleState.resumed";
 constexpr char kPaused[] = "AppLifecycleState.paused";
 constexpr char kDetached[] = "AppLifecycleState.detached";
 
+// Codec extension for UTF-8 strings.
+class StringSerializer : public StandardCodecSerializer {
+ public:
+  StringSerializer() = default;
+  virtual ~StringSerializer() = default;
+
+  // Returns the shared serializer instance.
+  static const StringSerializer& GetInstance() {
+    static StringSerializer sInstance;
+    return sInstance;
+  }
+
+  virtual void WriteValue(const EncodableValue& value,
+                          ByteStreamWriter* stream) const override {
+    if (auto string_value = std::get_if<std::string>(&value)) {
+      size_t size = string_value->size();
+      if (size > 0) {
+        stream->WriteBytes(
+            reinterpret_cast<const uint8_t*>(string_value->data()), size);
+      }
+    }
+  }
+};
+
 }  // namespace
 
 LifecycleChannel::LifecycleChannel(BinaryMessenger* messenger)
     : channel_(std::make_unique<BasicMessageChannel<EncodableValue>>(
           messenger,
           kChannelName,
-          &StandardMessageCodec::GetInstance())) {}
+          &StandardMessageCodec::GetInstance(
+              &StringSerializer::GetInstance()))) {}
 
 LifecycleChannel::~LifecycleChannel() {}