fix:优化foreach,list集合效率

app/src/main/kotlin/com/secspace/sms/activities/MainActivity.kt

@@ -38,6 +38,8 @@ import kotlinx.coroutines.launch
 import org.greenrobot.eventbus.EventBus
 import org.greenrobot.eventbus.Subscribe
 import org.greenrobot.eventbus.ThreadMode
+import java.util.Collections
+import java.util.WeakHashMap
 
 
 class MainActivity : SimpleActivity() {
@@ -49,7 +51,8 @@ class MainActivity : SimpleActivity() {
     private var lastSearchedText = ""
     private var bus: EventBus? = null
     private var wasProtectionHandled = false
-    private val listMessageId = arrayListOf<Long>()
+//    private val listMessageId = arrayListOf<Long>()
+    private val listMessageId = Collections.newSetFromMap(WeakHashMap<Long, Boolean>())
 
     private val binding by viewBinding(ActivityMainBinding::inflate)
 
@@ -361,14 +364,15 @@ class MainActivity : SimpleActivity() {
         Log.d(TAG, " getNewConversations  获取系统SMS DB短信列表(脏数据) conversations:${GsonUtil.parseListToJson(conversations)}")
 
         //通过DB数据与cache对比threadID
+        val threadIdSet = cachedConversations.map { it.threadId }.toSet()
         conversations.forEach { clonedConversation ->
-            val threadIds = cachedConversations.map { it.threadId }
-            if (!threadIds.contains(clonedConversation.threadId)) {
+            if (!threadIdSet.contains(clonedConversation.threadId)) { // O(1) 查找
                 conversationsDB.insertOrUpdate(clonedConversation)
                 cachedConversations.add(clonedConversation)
             }
         }
 
+
         cachedConversations.forEach { cachedConversation ->
             val threadId = cachedConversation.threadId