title: Remove padding in spinner
body: <p>Hello how can i remove this padding in spinner item? And how to remove underline? My code you can saw below. 
  <img src="https://i.stack.imgur.com/rccnO.jpg" alt="myImage"></p>
  
  <pre><code> &lt;LinearLayout
       android:orientation="vertical"
       android:layout_width="fill_parent"
       android:layout_height="fill_parent"&gt;
       &lt;TextView
           android:layout_width="fill_parent"
           android:layout_height="wrap_content"
           android:text="DETERGENT"
           android:id="@+id/textView"
           android:gravity="center_horizontal"
           android:layout_marginTop="18dp"
           android:textSize="14dp" android:textStyle="bold"/&gt;
       &lt;Spinner
           android:layout_width="fill_parent"
           android:layout_height="36dp"
           android:id="@+id/spinner_detergent"/&gt;
  </code></pre>
  
  <p>Java code:</p>
  
  <pre><code>ArrayAdapter&lt;String&gt; adapter = new ArrayAdapter&lt;String&gt;(this, R.layout.spinner_item, spinnerArray);
  adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
  spinnerDetergent.setAdapter(adapter);
  </code></pre>
  
  <p>Spinner_item.xml</p>
  
  <pre><code> &lt;?xml version="1.0" encoding="utf-8"?&gt;
  
       &lt;TextView
          xmlns:android="http://schemas.android.com/apk/res/android"
          android:layout_width="fill_parent"
          android:layout_height="20dp"
          android:textSize="18dp"
          android:textColor="#000000"
          android:gravity="center"
          android:text="dfdfdf"
          android:paddingLeft="0dp"
          android:paddingRight="0dp"/&gt;
  </code></pre>