diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1bfd26c..e7bcbf3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## [4.7.3]
+    * improve code style
+    * improve dropdown animate
+
 ## [4.7.2]
     * add actionAlignment for dropdown
 
diff --git a/example/android/app/src/main/AndroidManifest.xml b/example/android/app/src/main/AndroidManifest.xml
index 3a823b3..a9595e1 100644
--- a/example/android/app/src/main/AndroidManifest.xml
+++ b/example/android/app/src/main/AndroidManifest.xml
@@ -1,24 +1,13 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
-    <application
-        android:label="DialogDemo"
-        android:name="${applicationName}"
-        android:icon="@mipmap/ic_launcher">
-        <activity
-            android:name=".MainActivity"
-            android:exported="true"
-            android:launchMode="singleTop"
-            android:theme="@style/LaunchTheme"
-            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
-            android:hardwareAccelerated="true"
-            android:windowSoftInputMode="adjustResize">
+    <uses-permission android:name="android.permission.INTERNET" />
+
+    <application android:label="DialogDemo" android:name="${applicationName}" android:usesCleartextTraffic="true" android:icon="@mipmap/ic_launcher">
+        <activity android:name=".MainActivity" android:exported="true" android:launchMode="singleTop" android:theme="@style/LaunchTheme" android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode" android:hardwareAccelerated="true" android:windowSoftInputMode="adjustResize">
             <!-- Specifies an Android theme to apply to this Activity as soon as
                  the Android process has started. This theme is visible to the user
                  while the Flutter UI initializes. After that, this theme continues
                  to determine the Window background behind the Flutter UI. -->
-            <meta-data
-              android:name="io.flutter.embedding.android.NormalTheme"
-              android:resource="@style/NormalTheme"
-              />
+            <meta-data android:name="io.flutter.embedding.android.NormalTheme" android:resource="@style/NormalTheme" />
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
                 <category android:name="android.intent.category.LAUNCHER"/>
@@ -26,8 +15,6 @@
         </activity>
         <!-- Don't delete the meta-data below.
              This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
-        <meta-data
-            android:name="flutterEmbedding"
-            android:value="2" />
+        <meta-data android:name="flutterEmbedding" android:value="2" />
     </application>
 </manifest>
diff --git a/example/pubspec.lock b/example/pubspec.lock
index dc33cbc..59cce0b 100644
--- a/example/pubspec.lock
+++ b/example/pubspec.lock
@@ -1,14 +1,6 @@
 # Generated by pub
 # See https://dart.dev/tools/pub/glossary#lockfile
 packages:
-  archive:
-    dependency: transitive
-    description:
-      name: archive
-      sha256: "793964beb8e297995714326628881437d4211f10fc8843534bab54129cd896ee"
-      url: "https://pub.flutter-io.cn"
-    source: hosted
-    version: "3.3.1"
   async:
     dependency: transitive
     description:
@@ -57,14 +49,6 @@ packages:
       url: "https://pub.flutter-io.cn"
     source: hosted
     version: "0.3.1"
-  crypto:
-    dependency: transitive
-    description:
-      name: crypto
-      sha256: aa274aa7774f8964e4f4f38cc994db7b6158dd36e9187aaceaddc994b35c6c67
-      url: "https://pub.flutter-io.cn"
-    source: hosted
-    version: "3.0.2"
   fake_async:
     dependency: transitive
     description:
@@ -96,14 +80,6 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
-  image:
-    dependency: "direct main"
-    description:
-      name: image
-      sha256: "9d2c5f73435a70a936d317769ee8e7ef480e37674b9f2bce95ea98969a307855"
-      url: "https://pub.flutter-io.cn"
-    source: hosted
-    version: "3.2.0"
   intl:
     dependency: transitive
     description:
@@ -152,21 +128,13 @@ packages:
       url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.8.3"
-  petitparser:
-    dependency: transitive
-    description:
-      name: petitparser
-      sha256: "2ebb289dc4764ec397f5cd3ca9881c6d17196130a7d646ed022a0dd9c2e25a71"
-      url: "https://pub.flutter-io.cn"
-    source: hosted
-    version: "5.0.0"
   shirne_dialog:
     dependency: "direct main"
     description:
       path: ".."
       relative: true
     source: path
-    version: "4.7.2"
+    version: "4.7.3"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -220,14 +188,6 @@ packages:
       url: "https://pub.flutter-io.cn"
     source: hosted
     version: "0.6.1"
-  typed_data:
-    dependency: transitive
-    description:
-      name: typed_data
-      sha256: "26f87ade979c47a150c9eaab93ccd2bebe70a27dc0b4b29517f2904f04eb11a5"
-      url: "https://pub.flutter-io.cn"
-    source: hosted
-    version: "1.3.1"
   vector_math:
     dependency: transitive
     description:
@@ -244,13 +204,5 @@ packages:
       url: "https://pub.flutter-io.cn"
     source: hosted
     version: "0.3.0"
-  xml:
-    dependency: transitive
-    description:
-      name: xml
-      sha256: ac0e3f4bf00ba2708c33fbabbbe766300e509f8c82dbd4ab6525039813f7e2fb
-      url: "https://pub.flutter-io.cn"
-    source: hosted
-    version: "6.1.0"
 sdks:
   dart: ">=3.2.0-194.0.dev <4.0.0"
diff --git a/example/pubspec.yaml b/example/pubspec.yaml
index c35a28f..7cac318 100644
--- a/example/pubspec.yaml
+++ b/example/pubspec.yaml
@@ -26,14 +26,13 @@ dependencies:
   flutter_localizations:
     sdk: flutter
     
-  image:
   shirne_dialog:
     path: ../
 
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  flutter_lints: ^2.0.1
+  flutter_lints:
 
 # For information on the generic Dart part of this file, see the
 # following page: https://dart.dev/tools/pub/pubspec
diff --git a/lib/src/widgets/dropdown.dart b/lib/src/widgets/dropdown.dart
index ade7483..be4ef44 100644
--- a/lib/src/widgets/dropdown.dart
+++ b/lib/src/widgets/dropdown.dart
@@ -48,10 +48,17 @@ class _DropdownWidgetState extends State<DropdownWidget> {
       ),
       child: GestureDetector(
         onTap: () {},
-        child: CombinedAnimation(
-          config: widget.animate ?? AnimationConfig.fadeIn,
-          leaveConfig: widget.leaveAnimate,
-          //controller: controller,
+        child: ValueListenableBuilder<DropDownLayoutPosition>(
+          valueListenable: layoutPositionNotifier,
+          builder: (context, value, child) {
+            return CombinedAnimation(
+              config: widget.animate ??
+                  AnimationConfig.enter(align: value.startAlign),
+              leaveConfig: widget.leaveAnimate,
+              //controller: controller,
+              child: child!,
+            );
+          },
           child: Material(
             color: Colors.transparent,
             borderOnForeground: false,
@@ -245,6 +252,19 @@ enum DropDownLayoutPosition {
     }
   }
 
+  Alignment get startAlign {
+    switch (this) {
+      case top:
+        return const Alignment(0, 0.3);
+      case left:
+        return const Alignment(0.3, 0);
+      case right:
+        return const Alignment(-0.3, 0);
+      case bottom:
+        return const Alignment(0, -0.3);
+    }
+  }
+
   static const auto = {bottom, top, right, left};
   static const vertical = {bottom, top};
   static const horizontal = {bottom, top};
@@ -322,7 +342,9 @@ class _DropDownLayout extends SingleChildLayoutDelegate {
       constraintsSets.entries.first,
       bigger,
     );
-    layoutPositionNotifier.value = _resolved!.key;
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      layoutPositionNotifier.value = _resolved!.key;
+    });
     return _resolved!;
   }
 
diff --git a/pubspec.yaml b/pubspec.yaml
index 8cd7528..d565551 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: shirne_dialog
 description: A flutter package to use alert, toast, popup, snack, imagePreview, loading etc. with customizable style in anywhere.
-version: 4.7.2
+version: 4.7.3
 homepage: https://shirne.github.io/dialog/
 repository: https://github.com/shirne/shirne_dialog
 screenshots: 
@@ -22,7 +22,6 @@ dependencies:
     sdk: flutter
   combined_animation: ">=0.3.1 <1.0.0"
 
-
 dev_dependencies:
   flutter_test:
     sdk: flutter