title: Android Notification buttons not showing up
body: <p>This is my code to set up a notification with buttons.</p>
  
  <pre><code>Intent receiverIntent = new Intent(ctx, ResponsivePrefsActivity.class);
          PendingIntent pReceiverIntent = PendingIntent.getActivity(ctx, 1, receiverIntent, 0);
          Intent clearIntent = new Intent(ctx, ResponsivePrefsActivity.class);
          clearIntent.setAction("clear");
          PendingIntent pClearIntent = PendingIntent.getActivity(ctx, 1, clearIntent, 0);
  
          Intent colorsIntent = new Intent(ctx, ResponsivePrefsActivity.class);
          colorsIntent.setAction("colors");
          PendingIntent pColorsIntent = PendingIntent.getActivity(ctx, 1, colorsIntent, 0);
  
          Intent animationIntent = new Intent(ctx, ResponsivePrefsActivity.class);
          animationIntent.setAction("animation");
          PendingIntent pAnimation = PendingIntent.getActivity(ctx, 1, animationIntent, 0);
  
          Notification.Builder builder;
          builder = new Notification.Builder(ctx).setSmallIcon(R.drawable.ic_launcher).setAutoCancel(false)
                  .setContentTitle("Draw Me: A Live Wallpaper").setContentText("Never get bored again!")
                  .setContentIntent(pReceiverIntent).addAction(R.raw.ic_menu_close_clear_cancel, "Clear", pClearIntent)
                  .addAction(R.raw.ic_menu_edit, "Colors", pColorsIntent).addAction(R.raw.ic_menu_play_clip, "Animation", pAnimation);
          Notification notification = builder.build();
  
          NotificationManager notificationManager = (NotificationManager) ctx.getSystemService(Context.NOTIFICATION_SERVICE);
  
          notificationManager.notify(0, notification);
  </code></pre>
  
  <p>Notification is showing up but buttons don't. My device has Android 4.1.1
  I set up this notification in a Fragment. What am I doing wrong? Thanks!</p>