title: Edittext change border color with shape.xml
body: <p>I make a shape.xml file under res -> drawable folder.</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;selector
      xmlns:android="http://schemas.android.com/apk/res/android"
      android:shape="rectangle"&gt;
          &lt;solid android:color="#ffffff" /&gt;
          &lt;stroke android:width="1dip" android:color="#ff9900" /&gt;
  &lt;/selector&gt;
  </code></pre>
  
  <p>And then I use it on an <code>EditText</code>:</p>
  
  <pre><code>&lt;EditText
      android:layout_width="300dp"
      android:layout_height="50dp"
      android:id="@+id/editText"
      android:layout_alignParentBottom="true"
      android:layout_centerHorizontal="true"
      android:layout_marginTop="300dp"
      android:hint="@string/hint"
      android:paddingLeft="10dp"
      android:paddingRight="10dp"
      android:singleLine="true"
      android:background="@drawable/shape"/&gt;
  </code></pre>
  
  <p>But the result is that it doesn't change the border color at all. Why, what's wrong?</p>