title: Android - Icon not shown in AlertDialog
body: <p>I have an alert dialog that does not show the icon that I set using "setIcon".<br>
  I use Android Studio and Android Emulator API 19/ Android 4.4.2.</p>
  
  <p>I can run the app, the dialog is shown without icon, no error.<br>
  But Android studio marks the line that contains "setIcon" and offers me "Introduce local variable" and "Make method call chain into call sequence"</p>
  
  <p>So my question : Why is the icon not shown?</p>
  
  <p>My Code:</p>
  
  <pre><code>AlertDialog.Builder builder = new AlertDialog.Builder(this );  
  
  builder
  
  .setMessage("Repeat game?")
  .setIcon(android.R.drawable.ic_dialog_alert)         //&lt;--- icon does not show
  .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog, int which) {
          //Yes button clicked, do something
  
      }
  })
  .setNegativeButton("No", null)                      //Do nothing on no
  .show();
  </code></pre>