Xamarin Forms Android 错误膨胀类 MaterialCalendarGridView

Question

从 FormsApplicationActivity 迁移到 FormsAppCompatActivity 后，我收到以下错误消息：

Android.Views.InflateException: 'Binary XML file line #31 in com.myapp.app:layout/mtrl_calendar_month_labeled: Binary XML file line #18 in com.myapp.app:layout/mtrl_calendar_month: Error inflating class com.google.android.material.datepicker.MaterialCalendarGridView'

错误发生在第一行base.OnCreate(savedInstanceState);的OnCreate中

我的主要活动是这样的

[Activity(ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation, ScreenOrientation = ScreenOrientation.Portrait, LaunchMode = LaunchMode.SingleTop, MainLauncher = true, Theme = "@style/MyAppTheme")]
    [IntentFilter(new[] { Intent.ActionView},
        DataScheme = "https",
        DataHost =  "MyApp.com",
        AutoVerify = true,
        Categories = new[] { Intent.CategoryDefault, Intent.CategoryBrowsable})]
    [IntentFilter(new[] { Intent.ActionView },
        DataScheme = "http",
        DataHost = "MyApp.com",
        AutoVerify = true,
        Categories = new[] { Intent.CategoryDefault, Intent.CategoryBrowsable })]


    //[Activity(Label = "Muzzillo_v1", MainLauncher = true, Theme = "@style/AppTheme")]
    public class MainActivity : FormsAppCompatActivity, Android.Gms.Tasks.IOnSuccessListener
    {
        static MainActivity instance = null;
        public const string TAG = "MainActivity";
        internal static readonly string CHANNEL_ID = "my_notification_channel";


        public static Context AppContext;

        public static MainActivity CurrentActivity { get { return instance; } }

        IDeviceInstallationService _deviceInstallationService;
        IDeviceInstallationService DeviceInstallationService
    => _deviceInstallationService ??
        (_deviceInstallationService =
        DependencyService.Resolve<IDeviceInstallationService>());

        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);

            global::Xamarin.Forms.Forms.Init(this, savedInstanceState);

            AppCenter.Start(Constants.AppCenterAndroidKey,
                       typeof(Analytics), typeof(Crashes));

            Xamarin.Essentials.Platform.Init(this, savedInstanceState);

            if (Intent.Extras != null)
            {
                foreach (var key in Intent.Extras.KeySet())
                {
                    if (key != null)
                    {
                        var value = Intent.Extras.GetString(key);
                        Log.Debug(TAG, "Key: {0} Value: {1}", key, value);
                    }
                }
            }

            AppContext = this;
            instance = this;

            DependencyService.Register<IFileSystemAccessService, FileSystemAccessService>();
            DependencyService.Register<IDevicePropertyService, DevicePropertyService>();
            DependencyService.RegisterSingleton<IDeviceInstallationService>(new DeviceInstallationService());

            MR.Gestures.Android.Settings.LicenseKey = "P3CL-CRL5-YJFM-KJ6P-DRFT-DK4N-WRCL-XYP5-JY7Z-92HB-CWQM-5LQA-JNVS";

            if (DeviceInstallationService.NotificationsSupported)
            {
                FirebaseInstanceId.GetInstance(Firebase.FirebaseApp.Instance)
                    .GetInstanceId()
                    .AddOnSuccessListener(this);
            }

            LoadApplication(new App());

            App.Current.NotificationsUpdated += Current_NotificationsUpdated;

            ProcessNotificationActions(Intent);

            try
            {
                System.Diagnostics.Debug.WriteLine("Registering for push notifications ...");
                IsPlayServicesAvailable();
                CreateNotificationChannel();
            }
            catch (Exception ex)
            {
                Logger.Critical(ex);
                System.Diagnostics.Debug.WriteLine("MainActivity :: Error :: {0}", ex.Message);
            }
        }

这是我的styles.xml：

<?xml version="1.0" encoding="UTF-8"?>
<resources>
    <style name="MyAppTheme" parent="Theme.AppCompat.Light">
        <item name="android:colorPrimary">#ec1a23</item>
        <item name="android:colorPrimaryDark">#dd2c00</item>
        <item name="android:colorAccent">#ff3d00</item>
    <item name="windowActionBar">false</item>
    <item name="windowNoTitle">true</item>
  </style>
    <style name="Theme.Splash" parent="android:Theme">
        <item name="android:windowBackground">@drawable/splashscreen</item>
        <item name="android:windowNoTitle">true</item>
    </style>
    <style name="MyTheme" parent="MyTheme.Base">
    </style>
    <style name="MyTheme.Base" parent="android:Theme.Holo.Light">
        <item name="android:colorPrimary">@color/primary</item>
        <item name="android:colorPrimaryDark">@color/primaryDark</item>
        <item name="android:colorAccent">@color/accent</item>
        <item name="android:colorActivatedHighlight">@color/highlight</item>
        <item name="android:actionMenuTextColor">@color/actionbar_text</item>
    </style>
</resources>

这是 layout.xml：

<?xml version="1.0" encoding="utf-8"?>
<Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:minHeight="?android:attr/actionBarSize"
    android:background="?android:attr/colorPrimary"/>

---

更新

我可以通过删除layout.xml 文件并在styles.xml 文件中使用以下值来消除异常：

<?xml version="1.0" encoding="UTF-8"?>
<resources>
    <style name="MyAppTheme" parent="Theme.MaterialComponents.Light">
        <item name="android:colorPrimary">#ec1a23</item>
        <item name="android:colorPrimaryDark">#dd2c00</item>
        <item name="android:colorAccent">#ff3d00</item>
    <item name="windowActionBar">false</item>
    <item name="windowNoTitle">true</item>
  </style>
    <style name="Theme.Splash" parent="Theme.MaterialComponents.Light">
        <item name="android:windowBackground">@drawable/splashscreen</item>
        <item name="android:windowNoTitle">true</item>
    </style>
</resources>

知道如何在不删除 layout.xml 的情况下解决此问题吗？

更新 2 我的应用程序使用 NavigationPages。 我确实创建了一个新项目，但我找不到任何差异。

Answer 1

我能够修复异常，但现在我的工具栏完全消失了，我为这个问题创建了一个新的 stackoverflow 帖子：Xamarin Forms Android Toolbar missing after migration to Flyout and AppCompat

这里解决此问题的方法是删除layout.xml 文件并在styles.xml 文件中使用以下值：

<?xml version="1.0" encoding="UTF-8"?>
<resources>
    <style name="MyAppTheme" parent="Theme.MaterialComponents.Light">
        <item name="android:colorPrimary">#ec1a23</item>
        <item name="android:colorPrimaryDark">#dd2c00</item>
        <item name="android:colorAccent">#ff3d00</item>
    <item name="windowActionBar">false</item>
    <item name="windowNoTitle">true</item>
  </style>
    <style name="Theme.Splash" parent="Theme.MaterialComponents.Light">
        <item name="android:windowBackground">@drawable/splashscreen</item>
        <item name="android:windowNoTitle">true</item>
    </style>
</resources>