title: Strange black line under my custom Action Bar
body: <p>I made my custom Action Bar, but there is an ugly underline in under it.</p>
  
  <p><img src="https://i.stack.imgur.com/a24oK.png" alt="enter image description here"></p>
  
  <p>You can see the black line under my green actionBar. </p>
  
  <p>my Action Bar xml:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  </code></pre>
  
  <p></p>
  
  <pre><code>&lt;LinearLayout
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_marginBottom="3dp"
      android:layout_marginLeft="4dp"
      android:layout_marginRight="0dp"
      android:layout_marginTop="4dp" &gt;
  
      &lt;ImageButton
          android:id="@+id/menuToggleBtn"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_gravity="center"
          android:adjustViewBounds="false"
          android:background="@null"
          android:scaleType="centerInside"
          android:src="@drawable/menu_btn" /&gt;
  
      &lt;ImageView
          android:id="@+id/loadingIconIv"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_gravity="center"
          android:layout_weight="1"
          android:src="@drawable/flexilogo" /&gt;
  
      &lt;ImageButton
          android:id="@+id/ImageButton01"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:adjustViewBounds="false"
          android:background="@null"
          android:scaleType="centerInside"
          android:src="@drawable/menu_btn"
          android:visibility="invisible" /&gt;
  
  &lt;/LinearLayout&gt;
  
  &lt;View
      android:id="@+id/view1"
      android:layout_width="match_parent"
      android:layout_height="1dp"
      android:background="#6ea541" /&gt;
  </code></pre>
  
  <p></p>
  
  <p>And my code::</p>
  
  <pre><code>ActionBar actionBar = getActionBar();
      actionBar.setCustomView(R.layout.action_bar);
  
  
      menuToggleBtn = (ImageButton) actionBar.getCustomView().findViewById(
              R.id.menuToggleBtn);
      menuToggleBtn.setOnClickListener(this);
  
      actionBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
  </code></pre>
  
  <p>Why is that black line is there ? I would like to get rid of it. 
  Please help if you can.</p>
  
  <p><strong>E D I T:</strong></p>
  
  <p>I tried to add:</p>
  
  <pre><code>&lt;item name="android:windowContentOverlay"&gt;@null&lt;/item&gt;.
  </code></pre>
  
  <p>to my app's style, but it does not work :(</p>