title: Path.isConvex is not supported. Android Studio - Toggle Button
body: <p>I already read about this issue on stackoverflow but unfortunately haven't found the correct answer.</p>
  
  <p>I use a ToggleButton and it shows me the following error in the rendering window:</p>
  
  <pre><code>The graphics preview in the layout editor may not be accurate: 
  - Different corner sizes are not supported in Path.addRoundRect. (Ignore for this session) 
  - Path.isConvex is not supported. (Ignore for this session)
  </code></pre>
  
  <p>The terminal shows the following error message:</p>
  
  <pre><code>E/dalvikvm: Could not find class 'android.widget.ThemedSpinnerAdapter', referenced from method android.support.v7.widget.AppCompatSpinner$DropDownAdapter.&lt;init&gt;
  </code></pre>
  
  <p>When I set the api level in the rendering window to 19 instead of 23 the "Rendering problem" window won't appear but the error still occurs in the app when running on a device with Android 4.4.2.</p>
  
  <p>This is my simple ToggleButton:</p>
  
  <pre><code>&lt;ToggleButton
                  android:id="@+id/editToggleKunde6"
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"
                  android:textOn="@string/kunde_bearbeiten_txt1"
                  android:textOff="@string/kunde_bearbeiten_txt2"
                  android:checked="true"
                  /&gt;
  </code></pre>
  
  <p>Thanks for any idea!</p>