diff --git a/app/src/main/java/com/example/initiateaphonecallapp/MainActivity.kt b/app/src/main/java/com/example/initiateaphonecallapp/MainActivity.kt
index 6dd9173..91770e0 100644
--- a/app/src/main/java/com/example/initiateaphonecallapp/MainActivity.kt
+++ b/app/src/main/java/com/example/initiateaphonecallapp/MainActivity.kt
@@ -2,10 +2,13 @@ package com.example.initiateaphonecallapp
 
 import android.Manifest
 import android.app.AlertDialog
+import android.content.Intent
 import android.content.pm.PackageManager
+import android.net.Uri
 import android.os.Build
 import android.os.Bundle
 import android.os.Environment
+import android.util.Log
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
@@ -24,6 +27,11 @@ import com.example.initiateaphonecallapp.ui.LoginSms.LoginSmsScreen
 import com.example.initiateaphonecallapp.ui.MainScreen
 import com.example.initiateaphonecallapp.ui.login.LoginScreen
 import com.example.initiateaphonecallapp.ui.theme.InitiateAPhoneCallAppTheme
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import org.json.JSONObject
+import java.net.URL
 
 class MainActivity : ComponentActivity() {
     private val requiredPermissions = arrayOf(
@@ -52,6 +60,7 @@ class MainActivity : ComponentActivity() {
     private lateinit var storagePermissionManager: StoragePermissionManager
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        checkUpdate()
         CallRecordManager.initialize(this)
         println("🚀 Application: CallRecordManager 初始化完成")
 
@@ -131,6 +140,45 @@ class MainActivity : ComponentActivity() {
         }
     }
 
+    fun checkUpdate() {
+        CoroutineScope(Dispatchers.IO).launch {
+            try {
+                // 1️⃣ 获取服务器版本信息
+                val jsonString = URL("http://120.26.58.34/app/version.json").readText()
+//                val jsonString = URL("http://121.43.240.248/app/version.json").readText()
+                val json = JSONObject(jsonString)
+                val serverVersionCode = json.getInt("version")
+                val apkUrl = json.getString("apkUrl")
+
+                // 2️⃣ 获取本地版本
+                val localVersionCode = 1
+
+                if (serverVersionCode > localVersionCode) {
+                    Log.d("Update", "检测到新版本: $serverVersionCode")
+                    runOnUiThread { promptDownloadApk(apkUrl) }
+                } else {
+                    Log.d("Update", "已是最新版本")
+                }
+            } catch (e: Exception) {
+                Log.e("Update", "检查更新失败: ${e.message}")
+            }
+        }
+    }
+
+    private fun promptDownloadApk(apkUrl: String) {
+        AlertDialog.Builder(this)
+            .setTitle("发现新版本")
+            .setMessage("检测到新版本，是否下载并安装？")
+            .setPositiveButton("下载") { _, _ ->
+                // 打开浏览器下载
+                val intent = Intent(Intent.ACTION_VIEW, Uri.parse(apkUrl))
+                startActivity(intent)
+            }
+            .setNegativeButton("取消", null)
+            .setCancelable(false)
+            .show()
+    }
+
     private fun hasAllPermissions(): Boolean {
         return requiredPermissions.all { permission ->
             ContextCompat.checkSelfPermission(this, permission) == PackageManager.PERMISSION_GRANTED
diff --git a/app/src/main/java/com/example/initiateaphonecallapp/ui/login/LoginState.kt b/app/src/main/java/com/example/initiateaphonecallapp/ui/login/LoginState.kt
index 79df18d..3dd4ee1 100644
--- a/app/src/main/java/com/example/initiateaphonecallapp/ui/login/LoginState.kt
+++ b/app/src/main/java/com/example/initiateaphonecallapp/ui/login/LoginState.kt
@@ -1,8 +1,8 @@
 package com.example.initiateaphonecallapp.ui.login
 
 data class LoginState(
-    val username: String = "sadmin",
-    val password: String = "admin123",
+    val username: String = "",
+    val password: String = "",
     val isLoading: Boolean = false,
     val errorMessage: String = "",
     val isLoginSuccess: Boolean = false,