Fix the error of requestCode value range.

@@ -29,7 +29,11 @@ import java.io.File
 class MobileScanner(private val activity: Activity, private val textureRegistry: TextureRegistry)
     : MethodChannel.MethodCallHandler, EventChannel.StreamHandler, PluginRegistry.RequestPermissionsResultListener {
     companion object {
-        private const val REQUEST_CODE = 22022022
+        /**
+         * When the application's activity is [androidx.fragment.app.FragmentActivity], requestCode can only use the lower 16 bits.
+         * @see androidx.fragment.app.FragmentActivity.validateRequestPermissionsRequestCode
+         */
+        private const val REQUEST_CODE = 0x0786
         private val TAG = MobileScanner::class.java.simpleName
     }
 

@@ -5,7 +5,7 @@
         android:label="mobile_scanner_example"
         android:icon="@mipmap/ic_launcher">
         <activity
-            android:name="io.flutter.embedding.android.FlutterActivity"
+            android:name=".MainActivity"
             android:exported="true"
             android:launchMode="singleTop"
             android:theme="@style/LaunchTheme"

 package dev.steenbakker.mobile_scanner_example
 
-import io.flutter.embedding.android.FlutterActivity
+import io.flutter.embedding.android.FlutterFragmentActivity
 
-class MainActivity: FlutterActivity() {
+class MainActivity : FlutterFragmentActivity() {
 }