diff --git a/kouyu_english/android/app/src/main/AndroidManifest.xml b/kouyu_english/android/app/src/main/AndroidManifest.xml
index d27f30f..029b199 100644
--- a/kouyu_english/android/app/src/main/AndroidManifest.xml
+++ b/kouyu_english/android/app/src/main/AndroidManifest.xml
@@ -2,6 +2,7 @@
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.RECORD_AUDIO" />
     <application
+        android:usesCleartextTraffic="true"
         android:label="kouyu_english"
         android:name="${applicationName}"
         android:icon="@mipmap/ic_launcher">
diff --git a/kouyu_english/install_app.sh b/kouyu_english/install_app.sh
index 2165a05..df4e7eb 100755
--- a/kouyu_english/install_app.sh
+++ b/kouyu_english/install_app.sh
@@ -23,9 +23,13 @@ if [ ! -f "$APK_PATH" ]; then
 fi
 
 echo "🚀 正在安装 APK 到手机..."
-adb install -r "$APK_PATH"
+if ! adb install -r "$APK_PATH"; then
+  echo "⚠️ 覆盖安装失败（签名不一致或版本冲突），正在卸载旧版本并重新安装..."
+  adb uninstall com.shen.kouyu_english || true
+  adb install -r "$APK_PATH"
+fi
 
-echo "▶️ 正在手机上启动 口语英语 App..."
+echo "▶️ 正在手机上启动 开口英语 App..."
 adb shell monkey -p com.shen.kouyu_english -c android.intent.category.LAUNCHER 1 > /dev/null 2>&1 || true
 
 echo "✅ 安装并启动成功！"
diff --git a/kouyu_english/lib/features/progress/progress_pages.dart b/kouyu_english/lib/features/progress/progress_pages.dart
index 382e11a..0b85f5a 100644
--- a/kouyu_english/lib/features/progress/progress_pages.dart
+++ b/kouyu_english/lib/features/progress/progress_pages.dart
@@ -288,7 +288,7 @@ class _SettingsPageState extends State<SettingsPage> {
           style: TextStyle(fontSize: 12, color: AppColors.muted),
         ),
         DropdownButtonFormField<AiProviderType>(
-          initialValue: widget.state.aiProvider,
+          value: widget.state.aiProvider,
           decoration: const InputDecoration(
             labelText: '服务类型',
             border: OutlineInputBorder(),
@@ -313,15 +313,17 @@ class _SettingsPageState extends State<SettingsPage> {
           ],
           onChanged: (value) {
             if (value == null) return;
-            widget.state.setAiProvider(value);
-            if (value == AiProviderType.gemini &&
-                endpoint.text.trim().isEmpty) {
-              endpoint.text =
-                  'https://generativelanguage.googleapis.com/v1beta';
-              model.text = model.text.trim().isEmpty
-                  ? 'gemini-2.5-flash'
-                  : model.text;
-            }
+            setState(() {
+              widget.state.setAiProvider(value);
+              if (value == AiProviderType.gemini &&
+                  endpoint.text.trim().isEmpty) {
+                endpoint.text =
+                    'https://generativelanguage.googleapis.com/v1beta';
+                model.text = model.text.trim().isEmpty
+                    ? 'gemini-2.5-flash'
+                    : model.text;
+              }
+            });
           },
         ),
         TextField(