[Bug] ClassCastException running Android example

[mauriziopinotti]

Describe the bug
Running the Android example causes a ClassCastException.

To Reproduce
Steps to reproduce the behavior:

1. Clone the project
2. Run flutter run on an Android device
3. See error

Expected behavior
Android app should start.

Screenshots
N/A.

Logs

E/AndroidRuntime(28799): FATAL EXCEPTION: main
E/AndroidRuntime(28799): Process: de.mintware.example, PID: 28799
E/AndroidRuntime(28799): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{de.mintware.example/android.app.Application}: java.lang.ClassCastException: android.app.Application cannot be cast to android.app.Activity
E/AndroidRuntime(28799):        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:4047)
E/AndroidRuntime(28799):        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:4322)
E/AndroidRuntime(28799):        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:103)
E/AndroidRuntime(28799):        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:139)
E/AndroidRuntime(28799):        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:96)
E/AndroidRuntime(28799):        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2685)
E/AndroidRuntime(28799):        at android.os.Handler.dispatchMessage(Handler.java:106)
E/AndroidRuntime(28799):        at android.os.Looper.loopOnce(Looper.java:230)
E/AndroidRuntime(28799):        at android.os.Looper.loop(Looper.java:319)
E/AndroidRuntime(28799):        at android.app.ActivityThread.main(ActivityThread.java:8919)
E/AndroidRuntime(28799):        at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime(28799):        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:578)
E/AndroidRuntime(28799):        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1103)
E/AndroidRuntime(28799): Caused by: java.lang.ClassCastException: android.app.Application cannot be cast to android.app.Activity
E/AndroidRuntime(28799):        at android.app.AppComponentFactory.instantiateActivity(AppComponentFactory.java:95)
E/AndroidRuntime(28799):        at androidx.core.app.CoreComponentFactory.instantiateActivity(CoreComponentFactory.java:44)
E/AndroidRuntime(28799):        at android.app.Instrumentation.newActivity(Instrumentation.java:1378)
E/AndroidRuntime(28799):        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:4034)
E/AndroidRuntime(28799):        ... 12 more

Environment (please complete the following information):

• iOS? Version: ...
• Android? Version: any
• Real Device? Which?: ...
• Emulator/Simulator? Which?: ...
• Version of barcode_scan
• Output of flutter --version:

Flutter ...

Additional context
This commit broke it: c589b6f as android:name="${applicationName}" should be an attribute of <application>, not <activity>.

The correct syntax is:

diff --git a/example/android/app/src/main/AndroidManifest.xml b/example/android/app/src/main/AndroidManifest.xml
index b14b12f..b320208 100644
--- a/example/android/app/src/main/AndroidManifest.xml
+++ b/example/android/app/src/main/AndroidManifest.xml
@@ -1,6 +1,6 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="de.mintware.example">
-  <application android:label="example" android:icon="@mipmap/ic_launcher">
-    <activity android:name="${applicationName}" android:exported="true" android:launchMode="singleTop" android:theme="@style/LaunchTheme" android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode" android:hardwareAccelerated="true" android:windowSoftInputMode="adjustResize">
+  <application android:name="${applicationName}" android:label="example" android:icon="@mipmap/ic_launcher">
+    <activity android:name=".MainActivity" android:exported="true" android:launchMode="singleTop" android:theme="@style/LaunchTheme" android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode" android:hardwareAccelerated="true" android:windowSoftInputMode="adjustResize">
       <!-- Specifies an Android theme to apply to this Activity as soon as
                  the Android process has started. This theme is visible to the user
                  while the Flutter UI initializes. After that, this theme continues