Upgraded to Flutter Embedding V2.

android/src/main/kotlin/net/touchcapture/qr/flutterqr/FlutterQrPlugin.kt

@@ -1,24 +1,41 @@
 package net.touchcapture.qr.flutterqr
 
+import androidx.annotation.NonNull
+import io.flutter.embedding.engine.plugins.FlutterPlugin
 import io.flutter.plugin.common.MethodCall
 import io.flutter.plugin.common.MethodChannel.MethodCallHandler
 import io.flutter.plugin.common.MethodChannel.Result
 import io.flutter.plugin.common.PluginRegistry.Registrar
 
-class FlutterQrPlugin : MethodCallHandler {
+
+class FlutterQrPlugin : FlutterPlugin, MethodCallHandler {
+
+    /** Plugin registration embedding v1 */
     companion object {
         @JvmStatic
         fun registerWith(registrar: Registrar) {
-            registrar
-                    .platformViewRegistry()
-                    .registerViewFactory(
-                            "net.touchcapture.qr.flutterqr/qrview", QRViewFactory(registrar))
+            FlutterQrPlugin().onAttachedToEngine(registrar)
         }
     }
 
+    /** Plugin registration embedding v2 */
+    override fun onAttachedToEngine(@NonNull flutterPluginBinding: FlutterPlugin.FlutterPluginBinding) {
+        onAttachedToEngine(flutterPluginBinding)
+    }
+
+    override fun onDetachedFromEngine(binding: FlutterPlugin.FlutterPluginBinding) {
+    }
+
+    private fun onAttachedToEngine(registrar: Registrar) {
+        registrar
+                .platformViewRegistry()
+                .registerViewFactory(
+                        "net.touchcapture.qr.flutterqr/qrview", QRViewFactory(registrar))
+    }
+
     override fun onMethodCall(call: MethodCall, result: Result) {
-        when {
-            call.method == "getPlatformVersion" -> result.success("Android ${android.os.Build.VERSION.RELEASE}")
+        when (call.method) {
+            "getPlatformVersion" -> result.success("Android ${android.os.Build.VERSION.RELEASE}")
             else -> result.notImplemented()
         }
     }

example/android/app/src/main/AndroidManifest.xml

@@ -13,7 +13,6 @@
          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="flutter_qr_example"
         android:icon="@mipmap/ic_launcher">
         <activity
@@ -23,13 +22,19 @@
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density"
             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"
+                />
+            <meta-data
+                android:name="flutterEmbedding"
+                android:value="2" />
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
                 <category android:name="android.intent.category.LAUNCHER"/>

example/android/app/src/main/kotlin/net/touchcapture/qr/flutterqrexample/MainActivity.kt

@@ -1,13 +1,6 @@
 package net.touchcapture.qr.flutterqrexample
 
-import android.os.Bundle
-
-import io.flutter.app.FlutterActivity
-import io.flutter.plugins.GeneratedPluginRegistrant
+import io.flutter.embedding.android.FlutterActivity
 
 class MainActivity: FlutterActivity() {
-  override fun onCreate(savedInstanceState: Bundle?) {
-    super.onCreate(savedInstanceState)
-    GeneratedPluginRegistrant.registerWith(this)
-  }
 }

example/android/app/src/main/res/values/styles.xml

@@ -5,4 +5,8 @@
              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>