Add files via upload

Author: Android-PowerUser

app/src/main/kotlin/com/google/ai/sample/util/ChatHistoryPreferences.kt

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+package com.google.ai.sample.util
+
+import android.content.Context
+import android.content.SharedPreferences
+import com.google.ai.sample.feature.multimodal.PhotoParticipant
+import com.google.ai.sample.feature.multimodal.PhotoReasoningMessage
+import com.google.gson.Gson
+import com.google.gson.reflect.TypeToken
+
+/**
+ * Utility class for persisting chat history across app restarts
+ */
+object ChatHistoryPreferences {
+    private const val PREFS_NAME = "chat_history_prefs"
+    private const val KEY_CHAT_MESSAGES = "chat_messages"
+    
+    private val gson = Gson()
+    
+    /**
+     * Save chat messages to SharedPreferences
+     */
+    fun saveChatMessages(context: Context, messages: List<PhotoReasoningMessage>) {
+        val prefs = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
+        val editor = prefs.edit()
+        
+        val json = gson.toJson(messages)
+        editor.putString(KEY_CHAT_MESSAGES, json)
+        editor.apply()
+    }
+    
+    /**
+     * Load chat messages from SharedPreferences
+     */
+    fun loadChatMessages(context: Context): List<PhotoReasoningMessage> {
+        val prefs = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
+        val json = prefs.getString(KEY_CHAT_MESSAGES, null) ?: return emptyList()
+        
+        val type = object : TypeToken<List<PhotoReasoningMessage>>() {}.type
+        return try {
+            gson.fromJson(json, type)
+        } catch (e: Exception) {
+            emptyList()
+        }
+    }
+    
+    /**
+     * Clear all chat messages from SharedPreferences
+     */
+    fun clearChatMessages(context: Context) {
+        val prefs = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
+        val editor = prefs.edit()
+        editor.remove(KEY_CHAT_MESSAGES)
+        editor.apply()
+    }
+}