title: flutter app works on emulator but not in real device
body: <p>My app works on emulator but if I build it with (flutter build apk) or (flutter build apk --split-per-abi --no-sound-null-safety) and setup it on my phone it doesnt responde. It is stucking in a white screen. I didn't get where is the problem.</p>
  <p>Where i can look and find the solution. I didn't get whats wrong. Sometimes when I start in flutter emulator it says The following assertion was thrown while applying parent data.:
  <strong>Incorrect use of ParentDataWidget.
  The ParentDataWidget Expanded(flex: 1) wants to apply ParentData of type FlexParentData to a
  RenderObject, which has been set up to accept ParentData of incompatible type StackParentData.
  Usually, this means that the Expanded widget has the wrong ancestor RenderObjectWidget. Typically,
  Expanded widgets are placed directly inside Flex widgets.</strong>
  But if I change first screen to something nothing is changed.
  Thank you.
  Pubspec.yaml</p>
  <pre><code>name: aracqr
  description: A new Flutter project.
  
  # The following line prevents the package from being accidentally published to
  # pub.dev using `flutter pub publish`. This is preferred for private packages.
  publish_to: 'none' # Remove this line if you wish to publish to pub.dev
  
  # The following defines the version and build number for your application.
  # A version number is three numbers separated by dots, like 1.2.43
  # followed by an optional build number separated by a +.
  # Both the version and the builder number may be overridden in flutter
  # build by specifying --build-name and --build-number, respectively.
  # In Android, build-name is used as versionName while build-number used as versionCode.
  # Read more about Android versioning at https://developer.android.com/studio/publish/versioning
  # In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
  # Read more about iOS versioning at
  # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
  version: 1.0.0+1
  
  environment:
    sdk: &quot;&gt;=2.17.0 &lt;3.0.0&quot;
  
  # Dependencies specify other packages that your package needs in order to work.
  # To automatically upgrade your package dependencies to the latest versions
  # consider running `flutter pub upgrade --major-versions`. Alternatively,
  # dependencies can be manually updated by changing the version numbers below to
  # the latest version available on pub.dev. To see which dependencies have newer
  # versions available, run `flutter pub outdated`.
  dependencies:
    flutter:
      sdk: flutter
  
  
    # The following adds the Cupertino Icons font to your application.
    # Use with the CupertinoIcons class for iOS style icons.
    cupertino_icons: ^1.0.5
    firebase_core: ^1.20.1
    http: ^0.13.5
    firebase_messaging: ^12.0.2
    font_awesome_flutter: ^10.1.0
    flutter_svg: ^1.1.3
    qr_flutter: ^4.0.0
    firebase_auth: ^3.6.3
    introduction_screen: ^3.0.2
    cloud_firestore: ^3.4.4
  
  dev_dependencies:
    flutter_test:
      sdk: flutter
  
    # The &quot;flutter_lints&quot; package below contains a set of recommended lints to
    # encourage good coding practices. The lint set provided by the package is
    # activated in the `analysis_options.yaml` file located at the root of your
    # package. See that file for information about deactivating specific lint
    # rules and activating additional ones.
    flutter_lints: ^2.0.0
  
  # For information on the generic Dart part of this file, see the
  # following page: https://dart.dev/tools/pub/pubspec
  
  # The following section is specific to Flutter packages.
  flutter:
  
    # The following line ensures that the Material Icons font is
    # included with your application, so that you can use the icons in
    # the material Icons class.
    uses-material-design: true
    assets:
     - assets/
    #   - images/a_dot_ham.jpeg
  
    # An image asset can refer to one or more resolution-specific &quot;variants&quot;, see
    # https://flutter.dev/assets-and-images/#resolution-aware
  
    # For details regarding adding assets from package dependencies, see
    # https://flutter.dev/assets-and-images/#from-packages
  
    # To add custom fonts to your application, add a fonts section here,
    # in this &quot;flutter&quot; section. Each entry in this list should have a
    # &quot;family&quot; key with the font family name, and a &quot;fonts&quot; key with a
    # list giving the asset and other descriptors for the font. For
    # example:
    fonts:
  
     - family: roboto
       fonts:
         - asset: fonts/regular.ttf
         - asset: fonts/bold.ttf
         - asset: fonts/black.ttf
  
    # To add assets to your application, add an assets section, like this:
    # assets:
    #   - images/a_dot_burr.jpeg
    #   - images/a_dot_ham.jpeg
  
    # An image asset can refer to one or more resolution-specific &quot;variants&quot;, see
    # https://flutter.dev/assets-and-images/#resolution-aware
  
    # For details regarding adding assets from package dependencies, see
    # https://flutter.dev/assets-and-images/#from-packages
  
    # To add custom fonts to your application, add a fonts section here,
    # in this &quot;flutter&quot; section. Each entry in this list should have a
    # &quot;family&quot; key with the font family name, and a &quot;fonts&quot; key with a
    # list giving the asset and other descriptors for the font. For
    # example:
    # fonts:
    #   - family: Schyler
    #     fonts:
    #       - asset: fonts/Schyler-Regular.ttf
    #       - asset: fonts/Schyler-Italic.ttf
    #         style: italic
    #   - family: Trajan Pro
    #     fonts:
    #       - asset: fonts/TrajanPro.ttf
    #       - asset: fonts/TrajanPro_Bold.ttf
    #         weight: 700
    #
    # For details regarding fonts from package dependencies,
    # see https://flutter.dev/custom-fonts/#from-packages
  </code></pre>
  <p>Android Manifest xml</p>
  <pre><code>&lt;manifest xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
      package=&quot;store.sezenhs.aracqr&quot;&gt;
  
     &lt;application
          android:allowBackup=&quot;false&quot;
          android:fullBackupContent=&quot;false&quot;
          android:label=&quot;aracqr&quot;
          android:name=&quot;${applicationName}&quot;
          android:icon=&quot;@mipmap/ic_launcher&quot;&gt;
          &lt;activity
  
              android:name=&quot;.MainActivity&quot;
              android:exported=&quot;true&quot;
              android:launchMode=&quot;singleTop&quot;
              android:theme=&quot;@style/LaunchTheme&quot;
              android:configChanges=&quot;orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode&quot;
              android:hardwareAccelerated=&quot;true&quot;
              android:windowSoftInputMode=&quot;adjustResize&quot;&gt;
              &lt;!-- 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
                   to determine the Window background behind the Flutter UI. --&gt;
              &lt;meta-data
                android:name=&quot;io.flutter.embedding.android.NormalTheme&quot;
                android:resource=&quot;@style/NormalTheme&quot;
                /&gt;
              &lt;intent-filter&gt;
                  &lt;action android:name=&quot;android.intent.action.MAIN&quot;/&gt;
                  &lt;category android:name=&quot;android.intent.category.LAUNCHER&quot;/&gt;
              &lt;/intent-filter&gt;
          &lt;/activity&gt;
          &lt;!-- Don't delete the meta-data below.
               This is used by the Flutter tool to generate GeneratedPluginRegistrant.java --&gt;
          &lt;meta-data
              android:name=&quot;flutterEmbedding&quot;
              android:value=&quot;2&quot; /&gt;
  
      &lt;/application&gt;
          &lt;uses-permission android:name=&quot;android.permission.INTERNET&quot;/&gt;
  
  
  &lt;/manifest&gt;
  </code></pre>