title: Android: EditText displayed with black background
body: <p>I have a row with two EditTexts and two ImageButtons. In the preview of android studio everything looks fine and the EditTexts have the default style. But if I display it on my tablet the background is black.</p>
  
  <p>How it should look like:<br>
  <img src="https://i.stack.imgur.com/jMe0g.jpg" alt="enter image description here"></p>
  
  <p>How it looks like on the tablet: <br>
  <img src="https://i.stack.imgur.com/Vlmjc.jpg" alt="enter image description here"></p>
  
  <p>Other EditText-Boxes are displayed correctly. 
  Does anyone know why the these look different and how I can fix it?</p>
  
  <p>Here the XML-Layout of this line:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:orientation="horizontal"
      android:layout_centerHorizontal="true"
      &gt;
  &lt;EditText
      android:id="@+id/first_input"
      android:layout_width="0dp"
      android:layout_height="match_parent"
      android:layout_weight="1"
      /&gt;
  &lt;EditText
      android:id="@+id/second_input"
      android:layout_width="0dp"
      android:layout_height="match_parent"
      android:layout_weight="2.4"
      /&gt;
  &lt;ImageButton
      android:id="@+id/first_button"
      android:layout_width="0dp"
      android:layout_height="wrap_content"
      android:layout_weight="0.3"
      android:src="@drawable/move"
      android:background="@drawable/first_button_background"
      android:onClick="onFirstButtonClicked"
      /&gt;
  &lt;ImageButton
      android:id="@+id/second_button"
      android:layout_width="0dp"
      android:layout_height="wrap_content"
      android:layout_weight="0.3"
      android:src="@drawable/trash"
      android:background="@drawable/second_button_background"
      android:onClick="onSecondButtonClicked"
      /&gt;
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p>EDIT:
  I tried changing the background color to white but then the EditTexts lose their whole style so also the underlining will not be displayed anymore.</p>