title: Change android EditText style from rectangular border to underscore
body: <p>In one of my activities, my EditText views used to look like this</p>
  
  <p><img src="https://i.stack.imgur.com/2PhKN.png" alt="enter image description here"></p>
  
  <p>But now they looks like this</p>
  
  <p><img src="https://i.stack.imgur.com/odE4n.png" alt="enter image description here"></p>
  
  <p>I need help changing it back: from the rectangle to the underscore.</p>
  
  <p><strong><em>BACKGROUND</em></strong></p>
  
  <p>Because I needed to create a custom ActionBar, I had to change the theme of the activity in question, <code>YesterdayActivity</code>, using the following</p>
  
  <p>Style:</p>
  
  <pre><code>&lt;style name="CustomWindowTitleBackground"&gt;
          &lt;item name="android:background"&gt;#323331&lt;/item&gt;
      &lt;/style&gt;
  
      &lt;style name="CustomTheme" parent="android:Theme"&gt;
          &lt;item name="android:windowTitleSize"&gt;40dip&lt;/item&gt;
          &lt;item name="android:windowTitleBackgroundStyle"&gt;@style/CustomWindowTitleBackground&lt;/item&gt;
      &lt;/style&gt;
  </code></pre>
  
  <p>Manifest:</p>
  
  <pre><code>  &lt;activity
          android:name="com.example.YesterdayActivity"
          android:theme="@style/CustomTheme"&gt;
      &lt;/activity&gt;
  </code></pre>
  
  <p>onCreate:</p>
  
  <pre><code>@Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
          setContentView(R.layout.activity_yesterday);
          getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.yesterday_title_bar);
  …
  }
  </code></pre>