fix using deprecation api

Author: avdosev

android/app/build.gradle

@@ -26,7 +26,7 @@ apply plugin: 'kotlin-android'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 28
+    compileSdkVersion 31
 
     sourceSets {
         main.java.srcDirs += 'src/main/kotlin'

android/app/src/main/AndroidManifest.xml

@@ -7,7 +7,8 @@
          FlutterApplication and put your custom class here. -->
     <uses-permission android:name="android.permission.INTERNET"/>
     <application
-        android:name="io.flutter.app.FlutterApplication"
+    
+        android:name="${applicationName}"
         android:label="habr_app"
         android:icon="@mipmap/ic_launcher">
         <activity