How to customize a Spinner in Android

activity_main.xml 
 <RelativeLayout     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/rl"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:padding="10dp"     tools:context=".MainActivity"     android:background="#48b2fb"     >     <Spinner         android:id="@+id/spinner"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         /> </RelativeLayout>
spinner_item.xml 
 <?xml version="1.0" encoding="utf-8"?> <TextView     xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:padding="10dp"     android:textStyle="italic"     android:fontFamily="sans-serif-medium"     android:background="@drawable/spinner_item_border"     />
res/drawable/spinner_item_border.xml 
 <?xml version="1.0" encoding="utf-8"?> <layer-list xmlns:android="http://schemas.android.com/apk/res/android">     <item>         <shape android:shape="rectangle">             <solid android:color="#b7dc80"/>         </shape>     </item>     <item android:bottom="2dp">         <shape android:shape="rectangle">             <solid android:color="#c2ffa4"/>         </shape>     </item> </layer-list>
MainActivity.java 
 package com.cfsuman.me.androidcodesnippets;  import android.os.Bundle; import android.app.Activity; import android.widget.ArrayAdapter; import android.widget.Spinner;   public class MainActivity extends Activity {      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Get reference of widgets from XML layout         Spinner spinner = (Spinner) findViewById(R.id.spinner);          // Initializing a String Array         String[] plants = new String[]{                 "Black birch",                 "Canoe birch",                 "Cherry birch",                 "European weeping birch",                 "Mahogany birch"         };          // Initializing an ArrayAdapter         ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(                 this,R.layout.spinner_item,plants);         spinnerArrayAdapter.setDropDownViewResource(R.layout.spinner_item);         spinner.setAdapter(spinnerArrayAdapter);    } }
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