update gradle

.devcontainer/Dockerfile

@@ -0,0 +1 @@
+FROM jianboy/flutter-dev-container:3.0.5

.devcontainer/devcontainer.json

@@ -0,0 +1,45 @@
+// java8 + android env
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.233.0/containers/java-8
+{
+    "name": "Java 11",
+    "build": {
+        "dockerfile": "Dockerfile",
+        "args": {
+            // Use the VARIANT arg to pick a Debian OS version: buster, bullseye
+            // Use bullseye when running on local arm64/Apple Silicon.
+            "VARIANT": "buster",
+            // Options
+            "INSTALL_MAVEN": "true",
+            "INSTALL_GRADLE": "true",
+            "NODE_VERSION": "lts/*"
+        }
+    },
+    // Set *default* container specific settings.json values on container create.
+    "settings": {
+        "java.home": "/docker-java-home",
+        "java.import.gradle.java.home": "/usr/local/sdkman/candidates/java/current",
+        "java.configuration.runtimes": [
+            {
+                "default": true,
+                "name": "JavaSE-11",
+                "path": "/usr/local/sdkman/candidates/java/current"
+            }
+        ]
+    },
+    // Add the IDs of extensions you want installed when the container is created.
+    "extensions": [
+        "vscjava.vscode-java-pack",
+        "dart-code.dart-code",
+        "dart-code.flutter"
+    ],
+    // Use 'forwardPorts' to make a list of ports inside the container available locally.
+    // "forwardPorts": [],
+    // Use 'postCreateCommand' to run commands after the container is created.
+    // "postCreateCommand": "java -version",
+    // Comment out to connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+    "remoteUser": "vscode",
+    "features": {
+        "docker-in-docker": "latest"
+    }
+}

.github/workflows/build.yml

@@ -17,7 +17,7 @@ jobs:
         uses: actions/setup-java@v2
         with:
           distribution: 'adopt'
-          java-version: "8.x"
+          java-version: "11"
 
       - name: Flutter action
         uses: subosito/flutter-action@v1.5.3

android/app/build.gradle

@@ -25,7 +25,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion 31
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -36,7 +36,7 @@ android {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "me.yoqi.flutter.flutter_slider"
         minSdkVersion 16
-        targetSdkVersion 30
+        targetSdkVersion 31
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }

android/build.gradle

@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.1.0'
+        classpath 'com.android.tools.build:gradle:7.2.2'
     }
 }
 

android/gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.3.3-bin.zip

lib/views/custom_banner.dart

@@ -36,7 +36,7 @@ class _CustomBannerState extends State<CustomBanner> {
   Widget build(BuildContext context) {
     return Stack(
       alignment: Alignment.bottomCenter,
-      children: <Widget>[
+      children: [
         _buildPageView(),
         _buildIndicator(),
       ],

pubspec.yaml

@@ -4,7 +4,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.10.0 <3.0.0"
+  sdk: ">=2.17.6 <3.0.0"
 dependencies:
   flutter:
     sdk: flutter