如何將應用程序圖標添加到 Xamarin Android 應用程序

Question

我正在努力將應用程序圖標添加到操作欄。 我試過了

ActionBar.setDisplayShowHomeEnabled(true);

但是我得到了NullReferenceExeption如果有人知道如何添加它請幫忙。 謝謝。 這是我寫的代碼

 using Android.App; using Android.OS; using Android.Support.V7.App; using Android.Runtime; using Android.Widget; namespace Bteg { [Activity(Label = "@string/app_name", Theme = "@style/AppTheme", MainLauncher = true)] public class MainActivity : AppCompatActivity { protected override void OnCreate(Bundle savedInstanceState) { base.OnCreate(savedInstanceState); Xamarin.Essentials.Platform.Init(this, savedInstanceState); // Set our view from the "main" layout resource SetContentView(Resource.Layout.activity_main); ActionBar.SetDisplayShowHomeEnabled(true); } public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults) { Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults); base.OnRequestPermissionsResult(requestCode, permissions, grantResults); } } }

Answer 1

我注意到您使用了AppCompatActivity ，如果您想獲取操作欄，則需要使用以下代碼。

  [Activity(Label = "@string/app_name", Theme = "@style/AppTheme", MainLauncher = true)]
    public class MainActivity : AppCompatActivity
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            Xamarin.Essentials.Platform.Init(this, savedInstanceState);
            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.activity_main);

            SupportActionBar.SetDisplayHomeAsUpEnabled(true);

            SupportActionBar.SetHomeAsUpIndicator(Resource.Drawable.dicon);

        }
        public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
        {
            Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);

            base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
        }
    }

這是運行sceenshot。