如何在 MaterialSpinner Xamarin.Android 周围设置边框？

Question

我必须给我的 MaterialSpinner 添加以下边框：

我有以下MaterialSpinner

<fr.ganfra.materialspinner.MaterialSpinner
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/spinner"
    app:ms_arrowColor="#000000"
    app:ms_arrowSize="16dp"
    app:ms_floatingLabelColor="#A9A9A9"
    app:ms_floatingLabelText="Избор на група"
    app:ms_hint="Избор на група"
    app:ms_hintColor="#000000"
    android:padding="10dp"
    android:layout_gravity="center"
    android:background="@drawable/material_spinner_border"/>

material_spinner_border.xml:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" >

    <!-- View background color -->
    <solid
        android:color="#000000" >
    </solid>

    <!-- View border color and width -->
    <stroke
        android:width="1dp"
        android:color="#000000" >
    </stroke>

    <!-- The radius makes the corners rounded -->
    <corners
        android:radius="2dp"   >
    </corners>

</shape>

当我运行应用程序时，边框没有出现在屏幕上

Answer 1

How to put a border around MaterialSpinner Xamarin.Android?

将 MaterialSpinner ms_arrowColor 颜色设置为白色以隐藏箭头：

<fr.ganfra.materialspinner.MaterialSpinner
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/spinner"
        app:ms_floatingLabelColor="#A9A9A9"
        app:ms_floatingLabelText="Избор на група"
        app:ms_hint="Избор на група"
        app:ms_hintColor="#000000"
        app:ms_arrowColor="#ffffff"
        app:ms_arrowSize="16dp"
        android:background="@drawable/material_spinner_border"
        android:layout_margin="5dp"
        />

将您的箭头图像添加到您的项目中，例如：

然后，像这样修改您的 material_spinner_border：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
  <item>
    <layer-list>
      <item>
        <shape>
          <stroke android:width="3dp" android:color="#000000" />
          <corners android:radius="4dp" />
          <padding android:bottom="0dp" android:left="3dp" android:right="3dp" android:top="0dp" />
        </shape>
      </item>
      <item >
        <bitmap android:gravity="center|right" android:src="@drawable/myarrow" />
      </item>
    </layer-list>
  </item>
</selector>

Effect.

更新：

设置 Spinner 适配器后设置旋转器背景将解决此问题：

string[] ITEMS = { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5", "Item 6" };
var adapter = new ArrayAdapter<String>(this, Android.Resource.Layout.SimpleSpinnerItem, ITEMS);
adapter.SetDropDownViewResource(Android.Resource.Layout.SimpleSpinnerDropDownItem);
var spinner = FindViewById<MaterialSpinner>(Resource.Id.spinner);
spinner.Adapter = adapter;

spinner.Background = Drawable.CreateFromXml(Resources, Resources.GetXml(Resource.Drawable.material_spinner_border));

Answer 2

这是一张图片：

我忘了告诉你，如果重要的话我的背景是深色的

如何在 MaterialSpinner Xamarin.Android 周围设置边框？

How to put a border around MaterialSpinner Xamarin.Android?

border

spinner

xamarin.android

更新：