<EditText
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:layout_marginLeft="50dp"
   android:layout_marginRight="50dp"
   android:background="@drawable/weixin_edittext"
   android:layout_alignParentBottom="true"
   android:layout_marginBottom="6dp"
   android:paddingLeft="5dp"
   android:paddingRight="30dp"
   android:textColor="#000000"/>1
background: 
<?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="#0ac39e" />
    </shape>
  </item>
  <item android:bottom="6dp">
    <shape android:shape="rectangle" >
      <solid android:color="#ffffff" />
    </shape>
  </item>
  <item
      android:bottom="1dp"
      android:left="1dp"
      android:right="1dp">
    <shape android:shape="rectangle" >
      <solid android:color="#ffffff" />
    </shape>
  </item>
</layer-list>