Update add to app code to run on modern versions of agp and gradle.

add_to_app/android_view/android_view/app/build.gradle

@@ -4,12 +4,16 @@ plugins {
 }
 
 android {
-    compileSdkVersion 31
+    compileSdk 34
+
+    lint {
+        baseline = file("lint-baseline.xml")
+    }
 
     defaultConfig {
         applicationId "dev.flutter.example.androidView"
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion 21
+        targetSdkVersion 34
         versionCode 1
         versionName "1.0"
 
@@ -32,11 +36,12 @@ android {
     buildFeatures {
         viewBinding true
     }
+    namespace 'dev.flutter.example.androidView'
 }
 
 dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
-    implementation 'androidx.core:core-ktx:1.3.2'
+    implementation 'androidx.core:core-ktx:1.10.0'
     implementation 'androidx.appcompat:appcompat:1.2.0'
     implementation 'com.google.android.material:material:1.2.1'
     implementation 'androidx.constraintlayout:constraintlayout:2.0.4'

add_to_app/android_view/android_view/app/lint-baseline.xml

@@ -0,0 +1,279 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<issues format="6" by="lint 7.4.2" type="baseline" client="gradle" dependencies="false" name="AGP (7.4.2)" variant="all" version="7.4.2">
+
+    <issue
+        id="RedundantLabel"
+        message="Redundant label can be removed"
+        errorLine1="            android:label=&quot;@string/app_name&quot;>"
+        errorLine2="            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~">
+        <location
+            file="src/main/AndroidManifest.xml"
+            line="14"
+            column="13"/>
+    </issue>
+
+    <issue
+        id="GradleDependency"
+        message="A newer version of org.jetbrains.kotlin:kotlin-stdlib than 1.8.22 is available: 1.9.20"
+        errorLine1="}"
+        errorLine2="                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~">
+        <location
+            file="build.gradle"
+            line="39"
+            column="20"/>
+    </issue>
+
+    <issue
+        id="GradleDependency"
+        message="A newer version of androidx.core:core-ktx than 1.3.2 is available: 1.13.1"
+        errorLine1=""
+        errorLine2="                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~">
+        <location
+            file="build.gradle"
+            line="40"
+            column="20"/>
+    </issue>
+
+    <issue
+        id="GradleDependency"
+        message="A newer version of androidx.appcompat:appcompat than 1.2.0 is available: 1.7.0"
+        errorLine1="dependencies {"
+        errorLine2="                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~">
+        <location
+            file="build.gradle"
+            line="41"
+            column="20"/>
+    </issue>
+
+    <issue
+        id="GradleDependency"
+        message="A newer version of com.google.android.material:material than 1.2.1 is available: 1.12.0"
+        errorLine1="    implementation &quot;org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version&quot;"
+        errorLine2="                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~">
+        <location
+            file="build.gradle"
+            line="42"
+            column="20"/>
+    </issue>
+
+    <issue
+        id="GradleDependency"
+        message="A newer version of androidx.constraintlayout:constraintlayout than 2.0.4 is available: 2.1.4"
+        errorLine1="    implementation &apos;androidx.core:core-ktx:1.3.2&apos;"
+        errorLine2="                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~">
+        <location
+            file="build.gradle"
+            line="43"
+            column="20"/>
+    </issue>
+
+    <issue
+        id="GradleDependency"
+        message="A newer version of androidx.vectordrawable:vectordrawable than 1.1.0 is available: 1.2.0"
+        errorLine1="    implementation &apos;androidx.appcompat:appcompat:1.2.0&apos;"
+        errorLine2="                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~">
+        <location
+            file="build.gradle"
+            line="44"
+            column="20"/>
+    </issue>
+
+    <issue
+        id="GradleDependency"
+        message="A newer version of androidx.lifecycle:lifecycle-livedata-ktx than 2.2.0 is available: 2.8.2"
+        errorLine1="    implementation &apos;com.google.android.material:material:1.2.1&apos;"
+        errorLine2="                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~">
+        <location
+            file="build.gradle"
+            line="45"
+            column="20"/>
+    </issue>
+
+    <issue
+        id="GradleDependency"
+        message="A newer version of androidx.lifecycle:lifecycle-viewmodel-ktx than 2.2.0 is available: 2.8.2"
+        errorLine1="    implementation &apos;androidx.constraintlayout:constraintlayout:2.0.4&apos;"
+        errorLine2="                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~">
+        <location
+            file="build.gradle"
+            line="46"
+            column="20"/>
+    </issue>
+
+    <issue
+        id="GradleDependency"
+        message="A newer version of androidx.navigation:navigation-fragment-ktx than 2.3.2 is available: 2.7.7"
+        errorLine1="    implementation &apos;androidx.vectordrawable:vectordrawable:1.1.0&apos;"
+        errorLine2="                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~">
+        <location
+            file="build.gradle"
+            line="47"
+            column="20"/>
+    </issue>
+
+    <issue
+        id="GradleDependency"
+        message="A newer version of androidx.navigation:navigation-ui-ktx than 2.3.2 is available: 2.7.7"
+        errorLine1="    implementation &apos;androidx.lifecycle:lifecycle-livedata-ktx:2.2.0&apos;"
+        errorLine2="                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~">
+        <location
+            file="build.gradle"
+            line="48"
+            column="20"/>
+    </issue>
+
+    <issue
+        id="GradleDependency"
+        message="A newer version of androidx.recyclerview:recyclerview than 1.1.0 is available: 1.3.2"
+        errorLine1="    implementation &apos;androidx.lifecycle:lifecycle-viewmodel-ktx:2.2.0&apos;"
+        errorLine2="                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~">
+        <location
+            file="build.gradle"
+            line="49"
+            column="20"/>
+    </issue>
+
+    <issue
+        id="GradleDependency"
+        message="A newer version of androidx.test.ext:junit than 1.1.2 is available: 1.1.5"
+        errorLine1="    implementation &quot;androidx.recyclerview:recyclerview:1.1.0&quot;"
+        errorLine2="                              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~">
+        <location
+            file="build.gradle"
+            line="52"
+            column="31"/>
+    </issue>
+
+    <issue
+        id="GradleDependency"
+        message="A newer version of androidx.test.espresso:espresso-core than 3.3.0 is available: 3.5.1"
+        errorLine1="    implementation project(path: &apos;:flutter&apos;)"
+        errorLine2="                              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~">
+        <location
+            file="build.gradle"
+            line="53"
+            column="31"/>
+    </issue>
+
+    <issue
+        id="GradleDynamicVersion"
+        message="Avoid using + in version numbers; can lead to unpredictable and unrepeatable builds (junit:junit:4.+)"
+        errorLine1="    implementation &apos;androidx.navigation:navigation-ui-ktx:2.3.2&apos;"
+        errorLine2="                       ~~~~~~~~~~~~~~~~~">
+        <location
+            file="build.gradle"
+            line="51"
+            column="24"/>
+    </issue>
+
+    <issue
+        id="ExpiredTargetSdkVersion"
+        message="Google Play requires that apps target API level 31 or higher.&#xA;"
+        errorLine1="    defaultConfig {"
+        errorLine2="        ~~~~~~~~~~~~~~~~~~~">
+        <location
+            file="build.gradle"
+            line="12"
+            column="9"/>
+    </issue>
+
+    <issue
+        id="ObsoleteSdkInt"
+        message="Unnecessary; SDK_INT is always >= 21"
+        errorLine1="        &lt;item name=&quot;android:statusBarColor&quot; tools:targetApi=&quot;l&quot;>?attr/colorPrimaryVariant&lt;/item>"
+        errorLine2="                                            ~~~~~~~~~~~~~~~~~~~">
+        <location
+            file="src/main/res/values-night/themes.xml"
+            line="13"
+            column="45"/>
+    </issue>
+
+    <issue
+        id="ObsoleteSdkInt"
+        message="Unnecessary; SDK_INT is always >= 21"
+        errorLine1="        &lt;item name=&quot;android:statusBarColor&quot; tools:targetApi=&quot;l&quot;>?attr/colorPrimaryVariant&lt;/item>"
+        errorLine2="                                            ~~~~~~~~~~~~~~~~~~~">
+        <location
+            file="src/main/res/values/themes.xml"
+            line="13"
+            column="45"/>
+    </issue>
+
+    <issue
+        id="UnusedResources"
+        message="The resource `R.dimen.activity_horizontal_margin` appears to be unused"
+        errorLine1="    &lt;dimen name=&quot;activity_horizontal_margin&quot;>16dp&lt;/dimen>"
+        errorLine2="           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~">
+        <location
+            file="src/main/res/values/dimens.xml"
+            line="3"
+            column="12"/>
+    </issue>
+
+    <issue
+        id="UnusedResources"
+        message="The resource `R.dimen.activity_vertical_margin` appears to be unused"
+        errorLine1="    &lt;dimen name=&quot;activity_vertical_margin&quot;>16dp&lt;/dimen>"
+        errorLine2="           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~">
+        <location
+            file="src/main/res/values/dimens.xml"
+            line="4"
+            column="12"/>
+    </issue>
+
+    <issue
+        id="UnusedResources"
+        message="The resource `R.drawable.ic_dashboard_black_24dp` appears to be unused"
+        errorLine1="&lt;vector xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;"
+        errorLine2="^">
+        <location
+            file="src/main/res/drawable/ic_dashboard_black_24dp.xml"
+            line="1"
+            column="1"/>
+    </issue>
+
+    <issue
+        id="UnusedResources"
+        message="The resource `R.drawable.ic_home_black_24dp` appears to be unused"
+        errorLine1="&lt;vector xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;"
+        errorLine2="^">
+        <location
+            file="src/main/res/drawable/ic_home_black_24dp.xml"
+            line="1"
+            column="1"/>
+    </issue>
+
+    <issue
+        id="UnusedResources"
+        message="The resource `R.drawable.ic_notifications_black_24dp` appears to be unused"
+        errorLine1="&lt;vector xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;"
+        errorLine2="^">
+        <location
+            file="src/main/res/drawable/ic_notifications_black_24dp.xml"
+            line="1"
+            column="1"/>
+    </issue>
+
+    <issue
+        id="MonochromeLauncherIcon"
+        message="The application adaptive icon is missing a monochrome tag"
+        errorLine1="&lt;adaptive-icon xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;>"
+        errorLine2="^">
+        <location
+            file="src/main/res/mipmap-anydpi-v26/ic_launcher.xml"
+            line="2"
+            column="1"/>
+    </issue>
+
+    <issue
+        id="MonochromeLauncherIcon"
+        message="The application adaptive roundIcon is missing a monochrome tag"
+        errorLine1="&lt;adaptive-icon xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;>"
+        errorLine2="^">
+        <location
+            file="src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml"
+            line="2"
+            column="1"/>
+    </issue>
+
+</issues>

add_to_app/android_view/android_view/app/src/main/AndroidManifest.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="dev.flutter.example.androidView">
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
     <application
         android:allowBackup="true"
@@ -11,6 +10,7 @@
         android:theme="@style/Theme.FlutterViewIntegration">
         <activity
             android:name=".MainActivity"
+            android:exported="true"
             android:label="@string/app_name">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />

add_to_app/android_view/android_view/app/src/main/java/dev/flutter/example/androidView/MainActivity.kt

@@ -8,6 +8,7 @@ import android.content.Intent
 import android.os.Bundle
 import android.os.Parcelable
 import androidx.appcompat.app.AppCompatActivity
+import androidx.core.os.BundleCompat
 import androidx.recyclerview.widget.LinearLayoutManager
 import dev.flutter.example.androidView.databinding.ActivityMainBinding
 import io.flutter.FlutterInjector
@@ -61,7 +62,14 @@ class MainActivity : AppCompatActivity() {
         // If the activity was restarted, keep track of the previous scroll
         // position and of the previous cell indices that were randomly selected
         // as Flutter cells to preserve immersion.
-        layoutManager.onRestoreInstanceState(savedInstanceState?.getParcelable<Parcelable>("layoutManager"))
+        if (savedInstanceState != null) {
+            val state = BundleCompat.getParcelable<Parcelable>(
+                savedInstanceState,
+                "layoutManager",
+                Parcelable::class.java
+            )
+            layoutManager.onRestoreInstanceState(state)
+        }
         val previousFlutterCellsArray = savedInstanceState?.getIntegerArrayList("adapter")
         if (previousFlutterCellsArray != null) {
             adapter.previousFlutterCells = TreeSet(previousFlutterCellsArray)

add_to_app/android_view/android_view/build.gradle

@@ -1,12 +1,12 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
-    ext.kotlin_version = "1.6.0"
+    ext.kotlin_version = '1.8.0'
     repositories {
         google()
         mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.1.2'
+        classpath 'com.android.tools.build:gradle:8.3.2'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
 
         // NOTE: Do not place your application dependencies here; they belong

add_to_app/android_view/android_view/gradle.properties

@@ -16,4 +16,6 @@ org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
 # https://developer.android.com/topic/libraries/support-library/androidx-rn
 android.useAndroidX=true
 # Kotlin code style for this project: "official" or "obsolete":
-kotlin.code.style=official
+kotlin.code.style=official
+android.nonTransitiveRClass=false
+android.nonFinalResIds=false

add_to_app/android_view/android_view/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,5 @@
-#Wed Mar 10 09:46:16 PST 2021
 distributionBase=GRADLE_USER_HOME
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-bin.zip
 distributionPath=wrapper/dists
-zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.6-bin.zip
 zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists