完善

app/src/main/java/com/example/myapplication/MainActivity.kt

@@ -3,11 +3,16 @@ package com.example.myapplication
 import android.os.Bundle
 import android.view.View
 import androidx.appcompat.app.AppCompatActivity
+import androidx.lifecycle.lifecycleScope
 import androidx.navigation.fragment.NavHostFragment
 import androidx.navigation.ui.setupWithNavController
 import com.google.android.material.bottomnavigation.BottomNavigationView
 import androidx.navigation.NavController
 import androidx.navigation.NavDestination
+import com.example.myapplication.network.AuthEventBus
+import com.example.myapplication.network.AuthEvent
+import kotlinx.coroutines.flow.collectLatest
+import kotlinx.coroutines.launch
 
 class MainActivity : AppCompatActivity() {
 
@@ -18,6 +23,23 @@ class MainActivity : AppCompatActivity() {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
 
+        lifecycleScope.launch {
+            AuthEventBus.events.collectLatest { event ->
+                if (event is AuthEvent.TokenExpired) {
+                    val navController = (supportFragmentManager
+                        .findFragmentById(R.id.nav_host_fragment) as NavHostFragment)
+                        .navController
+        
+                    // 避免重复跳转（比如已经在登录页）
+                    if (navController.currentDestination?.id != R.id.loginFragment) {
+                        navController.navigate(R.id.action_global_loginFragment)
+                    }
+                } else if (event is AuthEvent.GenericError) {
+                    android.widget.Toast.makeText(this@MainActivity, "${event.message}", android.widget.Toast.LENGTH_SHORT).show()
+                }
+            }
+        }
+
         // 1. 找到 NavHostFragment
         val navHostFragment =
             supportFragmentManager.findFragmentById(R.id.nav_host_fragment) as NavHostFragment