diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3e7183b..c61e3b6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+## [3.1.0] - Release Flags
+* upgraded flutter_svg packages to ^0.19.1
+* upgraded flutter to 1.22.2 (stable)
+* AndroidX Migration
+* Upgraded 1.12 Android projects
+
 ## [3.0.5] - Release Flags
 * update flutter_svg packages to ^0.18.0
 
diff --git a/README.md b/README.md
index e30e7c6..8c12e69 100644
--- a/README.md
+++ b/README.md
@@ -51,7 +51,7 @@ flutter channel <channel-name>
 * `develop` --> develop
 * `stable` --> verison X.Y.Z  (using latest `stable` channel Flutter SDK)
 ```
-Channel stable, 1.12.2
+Channel stable, 1.22.2
 ```
 * `master` --> verison X.Y.Z-pre  (using latest `bate` channel Flutter SDK)
 ```
diff --git a/example/android/app/build.gradle b/example/android/app/build.gradle
index 4ed2e25..5113dfc 100644
--- a/example/android/app/build.gradle
+++ b/example/android/app/build.gradle
@@ -38,7 +38,7 @@ android {
         targetSdkVersion 28
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
-        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
     }
 
     buildTypes {
@@ -56,6 +56,6 @@ flutter {
 
 dependencies {
     testImplementation 'junit:junit:4.12'
-    androidTestImplementation 'com.android.support.test:runner:1.0.2'
-    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0'
 }
diff --git a/example/android/app/src/main/AndroidManifest.xml b/example/android/app/src/main/AndroidManifest.xml
index 2877140..33094ac 100644
--- a/example/android/app/src/main/AndroidManifest.xml
+++ b/example/android/app/src/main/AndroidManifest.xml
@@ -1,15 +1,12 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.example.example">
 
-    <!-- io.flutter.app.FlutterApplication is an android.app.Application that
-         calls FlutterMain.startInitialization(this); in its onCreate method.
-         In most cases you can leave this as-is, but you if you want to provide
-         additional functionality it is fine to subclass or reimplement
-         FlutterApplication and put your custom class here. -->
     <application
-        android:name="io.flutter.app.FlutterApplication"
         android:label="example"
         android:icon="@mipmap/ic_launcher">
+        <meta-data
+            android:name="flutterEmbedding"
+            android:value="2" />
         <activity
             android:name=".MainActivity"
             android:launchMode="singleTop"
@@ -17,13 +14,17 @@
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
             android:hardwareAccelerated="true"
             android:windowSoftInputMode="adjustResize">
-            <!-- This keeps the window background of the activity showing
-                 until Flutter renders its first frame. It can be removed if
-                 there is no splash screen (such as the default splash screen
-                 defined in @style/LaunchTheme). -->
+            <!-- Specify that the launch screen should continue being displayed -->
+            <!-- until Flutter renders its first frame. -->
             <meta-data
-                android:name="io.flutter.app.android.SplashScreenUntilFirstFrame"
-                android:value="true" />
+            android:name="io.flutter.embedding.android.SplashScreenDrawable"
+            android:resource="@drawable/launch_background" />
+
+            <!-- Theme to apply as soon as Flutter begins rendering frames -->
+            <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"/>
diff --git a/example/android/app/src/main/java/com/example/example/MainActivity.java b/example/android/app/src/main/java/com/example/example/MainActivity.java
index 84f8920..59f336d 100644
--- a/example/android/app/src/main/java/com/example/example/MainActivity.java
+++ b/example/android/app/src/main/java/com/example/example/MainActivity.java
@@ -1,13 +1,6 @@
 package com.example.example;
 
-import android.os.Bundle;
-import io.flutter.app.FlutterActivity;
-import io.flutter.plugins.GeneratedPluginRegistrant;
+import io.flutter.embedding.android.FlutterActivity;
 
 public class MainActivity extends FlutterActivity {
-  @Override
-  protected void onCreate(Bundle savedInstanceState) {
-    super.onCreate(savedInstanceState);
-    GeneratedPluginRegistrant.registerWith(this);
-  }
 }
diff --git a/example/android/app/src/main/res/values/styles.xml b/example/android/app/src/main/res/values/styles.xml
index 00fa441..c745a5e 100644
--- a/example/android/app/src/main/res/values/styles.xml
+++ b/example/android/app/src/main/res/values/styles.xml
@@ -5,4 +5,7 @@
              Flutter draws its first frame -->
         <item name="android:windowBackground">@drawable/launch_background</item>
     </style>
+    <style name="NormalTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
 </resources>
diff --git a/example/android/gradle.properties b/example/android/gradle.properties
index 1441b1d..2324ab5 100644
--- a/example/android/gradle.properties
+++ b/example/android/gradle.properties
@@ -1,3 +1,5 @@
 org.gradle.jvmargs=-Xmx1536M
 
 android.enableR8=true
+android.useAndroidX=true
+android.enableJetifier=true
diff --git a/pubspec.lock b/pubspec.lock
index 732dcde..d6bd28a 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -5,58 +5,58 @@ packages:
     dependency: transitive
     description:
       name: async
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.4.2"
+    version: "2.5.0-nullsafety.1"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.0.0"
+    version: "2.1.0-nullsafety.1"
   characters:
     dependency: transitive
     description:
       name: characters
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.0.0"
+    version: "1.1.0-nullsafety.3"
   charcode:
     dependency: transitive
     description:
       name: charcode
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.1.3"
+    version: "1.2.0-nullsafety.1"
   clock:
     dependency: transitive
     description:
       name: clock
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.0.1"
+    version: "1.1.0-nullsafety.1"
   collection:
     dependency: transitive
     description:
       name: collection
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.14.13"
+    version: "1.15.0-nullsafety.3"
   convert:
     dependency: transitive
     description:
       name: convert
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "2.1.1"
   fake_async:
     dependency: transitive
     description:
       name: fake_async
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.1.0"
+    version: "1.2.0-nullsafety.1"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -66,9 +66,9 @@ packages:
     dependency: "direct main"
     description:
       name: flutter_svg
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.18.0"
+    version: "0.19.1"
   flutter_test:
     dependency: "direct dev"
     description: flutter
@@ -78,44 +78,44 @@ packages:
     dependency: transitive
     description:
       name: matcher
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.12.8"
+    version: "0.12.10-nullsafety.1"
   meta:
     dependency: transitive
     description:
       name: meta
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.1.8"
+    version: "1.3.0-nullsafety.3"
   path:
     dependency: transitive
     description:
       name: path
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.7.0"
+    version: "1.8.0-nullsafety.1"
   path_drawing:
     dependency: transitive
     description:
       name: path_drawing
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.4.1"
+    version: "0.4.1+1"
   path_parsing:
     dependency: transitive
     description:
       name: path_parsing
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "0.1.4"
   petitparser:
     dependency: transitive
     description:
       name: petitparser
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "3.0.4"
+    version: "3.1.0"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -125,65 +125,65 @@ packages:
     dependency: transitive
     description:
       name: source_span
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.7.0"
+    version: "1.8.0-nullsafety.2"
   stack_trace:
     dependency: transitive
     description:
       name: stack_trace
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.9.5"
+    version: "1.10.0-nullsafety.1"
   stream_channel:
     dependency: transitive
     description:
       name: stream_channel
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.0.0"
+    version: "2.1.0-nullsafety.1"
   string_scanner:
     dependency: transitive
     description:
       name: string_scanner
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.0.5"
+    version: "1.1.0-nullsafety.1"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.1.0"
+    version: "1.2.0-nullsafety.1"
   test_api:
     dependency: transitive
     description:
       name: test_api
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.2.17"
+    version: "0.2.19-nullsafety.2"
   typed_data:
     dependency: transitive
     description:
       name: typed_data
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.2.0"
+    version: "1.3.0-nullsafety.3"
   vector_math:
     dependency: transitive
     description:
       name: vector_math
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.0.8"
+    version: "2.1.0-nullsafety.3"
   xml:
     dependency: transitive
     description:
       name: xml
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "4.2.0"
+    version: "4.5.1"
 sdks:
-  dart: ">=2.9.0-14.0.dev <3.0.0"
+  dart: ">=2.10.0-110 <2.11.0"
   flutter: ">=1.18.0-6.0.pre <2.0.0"
diff --git a/pubspec.yaml b/pubspec.yaml
index 554c0f7..f0be6ba 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: flag
 description: A flag Flutter package. Use for showing flags. All flags came from https://www.un.org/en/member-states/index.html . 
-version: 3.0.5
+version: 3.1.0
 homepage: https://github.com/LunaGao/flag_flutter
 
 environment:
@@ -10,7 +10,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-  flutter_svg: ^0.18.0
+  flutter_svg: ^0.19.1
 
 dev_dependencies:
   flutter_test: