paint single unicode hearts as red and slightly larger

src/main/java/eu/siacs/conversations/entities/Message.java

@@ -9,6 +9,7 @@ import java.util.Arrays;
 
 import eu.siacs.conversations.Config;
 import eu.siacs.conversations.utils.GeoHelper;
+import eu.siacs.conversations.utils.UIHelper;
 import eu.siacs.conversations.xmpp.jid.InvalidJidException;
 import eu.siacs.conversations.xmpp.jid.Jid;
 
@@ -375,7 +376,9 @@ public class Message extends AbstractEntity {
 						!message.bodyContainsDownloadable() &&
 						!this.bodyContainsDownloadable() &&
 						!message.getBody().startsWith(ME_COMMAND) &&
-			 !this.getBody().startsWith(ME_COMMAND)
+						!this.getBody().startsWith(ME_COMMAND) &&
+						!this.bodyIsHeart() &&
+						!message.bodyIsHeart()
 				);
 	}
 
@@ -474,6 +477,11 @@ public class Message extends AbstractEntity {
 		}
 	}
 
+	public boolean bodyIsHeart() {
+		return body != null &&
+				(body.trim().equals(UIHelper.BLACK_HEART_SUIT) || body.trim().equals(UIHelper.HEAVY_BLACK_HEART_SUIT));
+	}
+
 	public ImageParams getImageParams() {
 		ImageParams params = getLegacyImageParams();
 		if (params != null) {

src/main/java/eu/siacs/conversations/ui/adapter/MessageAdapter.java

@@ -7,7 +7,9 @@ import android.graphics.Typeface;
 import android.net.Uri;
 import android.text.Spannable;
 import android.text.SpannableString;
+import android.text.Spanned;
 import android.text.style.ForegroundColorSpan;
+import android.text.style.RelativeSizeSpan;
 import android.text.style.StyleSpan;
 import android.util.DisplayMetrics;
 import android.util.Log;
@@ -213,6 +215,18 @@ public class MessageAdapter extends ArrayAdapter<Message> {
 		viewHolder.messageBody.setTextIsSelectable(false);
 	}
 
+	private void displayHeartMesage(final ViewHolder viewHolder, final String body) {
+		if (viewHolder.download_button != null) {
+			viewHolder.download_button.setVisibility(View.GONE);
+		}
+		viewHolder.image.setVisibility(View.GONE);
+		viewHolder.messageBody.setVisibility(View.VISIBLE);
+		Spannable span = new SpannableString(body);
+		span.setSpan(new RelativeSizeSpan(4.0f),0,body.length(),Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
+		span.setSpan(new ForegroundColorSpan(activity.getWarningTextColor()),0,body.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
+		viewHolder.messageBody.setText(span);
+	}
+
 	private void displayTextMessage(final ViewHolder viewHolder, final Message message) {
 		if (viewHolder.download_button != null) {
 			viewHolder.download_button.setVisibility(View.GONE);
@@ -527,10 +541,14 @@ public class MessageAdapter extends ArrayAdapter<Message> {
 		} else {
 			if (GeoHelper.isGeoUri(message.getBody())) {
 				displayLocationMessage(viewHolder,message);
+			} else {
+				if (message.bodyIsHeart()) {
+					displayHeartMesage(viewHolder," "+message.getBody().trim()+" ");
 				} else {
 					displayTextMessage(viewHolder, message);
 				}
 			}
+		}
 
 		displayStatus(viewHolder, message);
 

src/main/java/eu/siacs/conversations/utils/UIHelper.java

@@ -17,6 +17,10 @@ import android.text.format.DateUtils;
 import android.util.Pair;
 
 public class UIHelper {
+
+	public static String BLACK_HEART_SUIT = "\u2665";
+	public static String HEAVY_BLACK_HEART_SUIT = "\u2764";
+
 	private static final int SHORT_DATE_FLAGS = DateUtils.FORMAT_SHOW_DATE
 		| DateUtils.FORMAT_NO_YEAR | DateUtils.FORMAT_ABBREV_ALL;
 	private static final int FULL_DATE_FLAGS = DateUtils.FORMAT_SHOW_TIME