我想开发定制微调像各地微调线与三角形右下角 像下图

i want to develop custom spinner like line around spinner with triangle at right bottom corner like following image

以上图，我写我的自定义微调像 spinner.xml

for above fig I wrote my custom spinner like a spinner.xml

 <Spinner android:background="@drawable/spinner_background"/>

spinner_background.xml

spinner_background.xml

<?xml version="1.0" encoding="UTF-8"?>

<item android:state_pressed="true"
      android:drawable="@drawable/spinner_ab_pressed_new_theme_bs">
    <shape>

        <solid 
            android:color="@color/White" />

        <corners android:radius="3dp" />

        <padding 
            android:bottom="10dp" 
            android:left="10dp" 
            android:right="10dp" 
            android:top="10dp" />

         <stroke 
            android:width="2dp" 
            android:color="@color/skyblue" />
    </shape>
 </item>
 <!-- spinner_ab_default_new_theme_bs -> this image for corner triangle -->
<item

    android:drawable="@drawable/spinner_ab_default_new_theme_bs" >
    <shape>
        <solid
            android:color="@color/White">
        </solid>

        <corners android:radius="3dp" />

        <padding
            android:bottom="10dp" 
            android:left="10dp" 
            android:right="10dp" 
            android:top="10dp" />
         <stroke 
            android:width="2dp" 
            android:color="@color/gray"/>
    </shape>
</item>

和我有一样的输出如下图

and i got output like following image

我试过了很多，但没有达到我的目标，请任何人有解决方案来开发微调 像上面的第一个图像。

I tried lot but not achieve my goal please anybody have solution to develop spinner like above first one image.

在此先感谢

推荐答案

微调

<Spinner
    android:id="@+id/To_Units"
    style="@style/spinner_style" />

style.xml

    <style name="spinner_style">
          <item name="android:layout_width">match_parent</item>
          <item name="android:layout_height">wrap_content</item>
          <item name="android:background">@drawable/gradient_spinner</item>
          <item name="android:layout_margin">10dp</item>
          <item name="android:paddingLeft">8dp</item>
          <item name="android:paddingRight">20dp</item>
          <item name="android:paddingTop">5dp</item>
          <item name="android:paddingBottom">5dp</item>
          <item name="android:popupBackground">#DFFFFFFF</item>
     </style>

gradient_spinner.xml （在绘制文件夹）

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

    <item><layer-list>
            <item><shape>
                    <gradient android:angle="90" android:endColor="#B3BBCC" android:startColor="#E8EBEF" android:type="linear" />

                    <stroke android:width="1dp" android:color="#000000" />

                    <corners android:radius="4dp" />

                    <padding android:bottom="3dp" android:left="3dp" android:right="3dp" android:top="3dp" />
                </shape></item>
            <item ><bitmap android:gravity="bottom|right" android:src="@drawable/spinner_arrow" />
            </item>
        </layer-list></item>

</selector>  

@绘制/ spinner_arrow 是右下角的​​图片

@drawable/spinner_arrow is your bottom right corner image