title: Android ImageButton does not display image, even though it is visible in the Designer preview
body: <p>i am trying to create an Image Button in Android Studio. The Designer preview shows the image correctly, but when I run the App there is no image in the Button. Just an empty button as small as possible.</p>
  
  <p>Things I have tried:</p>
  
  <ul>
  <li>Copying the image from the Android drawable folder into my own drawable folder</li>
  <li>Creating a placeholder image because of a bug the prevents the first image in the folder to not show up, according to some sources on stackoverflow</li>
  <li>Using different images</li>
  </ul>
  
  <p>None of this worked for me. It is like the whole function is just broken. The interesting part is, when I set the image I want as the background of the imagebutton it works fine. But it looses its "button-appearence", so thats not a solution for me.</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;RelativeLayout
      xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:orientation="vertical"&gt;
  
  &lt;org.osmdroid.views.MapView android:id="@+id/map"
  android:layout_width="match_parent"
  android:layout_height="match_parent" /&gt;
  
  &lt;LinearLayout
      android:id="@+id/search_ui"
      xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:tools="http://schemas.android.com/tools"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_margin="5dp"
      android:padding="1dp"
      android:background="@color/white"
      android:orientation="horizontal"&gt;
      &lt;ImageButton
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          app:srcCompat="@drawable/ic_menu_manage"
          android:id="@+id/imageButton"/&gt;
      &lt;EditText android:id="@+id/edit_search_string"
          android:layout_weight="1"
          android:layout_width="0dp"
          android:layout_height="wrap_content"
          android:hint="@string/search_string" /&gt;
      &lt;Button
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="@string/button_send"
          android:onClick="myClickHandler"/&gt;
  &lt;/LinearLayout&gt;
  
  &lt;LinearLayout
      xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:padding="5dp"
      android:background="@color/white"
      android:layout_below="@id/search_ui"&gt;
      &lt;TextView
          android:id="@+id/display"
          android:textSize="16sp"
          android:textStyle="bold"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:text="New Text" /&gt;
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p></p>