Added tiled MUC icons

Now, MUCs have icons with up to 4 tiles representing MUC members,
similar to the gmail app.

Some caveats:
As of now, no ordering is imposed on the members, we simply pick the
first (up to) 4 returned by the MucOptions object. This could be done
better, e.g. by picking more important members first (based on
affil/role), or even going so far as to order them by how recently they
sent a message in the MUC.
Also, the code generating the tiles is really messy right now (tons of
copy and paste). It seems to work though. I will clean this up soon.

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

@@ -12,6 +12,8 @@ import eu.siacs.conversations.entities.Account;
 import eu.siacs.conversations.entities.Contact;
 import eu.siacs.conversations.entities.Conversation;
 import eu.siacs.conversations.entities.Message;
+import eu.siacs.conversations.entities.MucOptions;
+import eu.siacs.conversations.entities.MucOptions.User;
 import eu.siacs.conversations.ui.ConversationActivity;
 import eu.siacs.conversations.ui.ManageAccountActivity;
 
@@ -65,33 +67,178 @@ public class UIHelper {
 		}
 	}
 
-	private static Bitmap getUnknownContactPicture(String name, int size) {
+	private static int getNameColor(String name) {
-		String firstLetter = (name.length() > 0) ? name.substring(0, 1).toUpperCase(Locale.US) : " ";
-
 		int holoColors[] = { 0xFF1da9da, 0xFFb368d9, 0xFF83b600, 0xFFffa713,
 				0xFFe92727 };
-
 		int color = holoColors[Math.abs(name.toLowerCase(Locale.getDefault()).hashCode()) % holoColors.length];
+		return color;
+	}
 
+	private static Bitmap getUnknownContactPicture(String[] names, int size) {
+		final int fgColor = 0xffe5e5e5;
+		int tiles = (names.length > 4)? 4 : names.length;
 		Bitmap bitmap = Bitmap
 				.createBitmap(size, size, Bitmap.Config.ARGB_8888);
 		Canvas canvas = new Canvas(bitmap);
 
-		bitmap.eraseColor(color);
+		String[] letters = new String[tiles];
+		int[] colors = new int[tiles];
+		for(int i = 0; i < tiles; ++i) {
+			letters[i] = (names[i].length() > 0) ?
+					names[i].substring(0, 1).toUpperCase(Locale.US) : " ";
+			colors[i] = getNameColor(names[i]);
+		}
+		Paint textPaint = new Paint(), tilePaint = new Paint();
+		textPaint.setColor(fgColor);
+		Rect rect, left, right, topLeft, bottomLeft, topRight, bottomRight; 
+		float width;
 
-		Paint paint = new Paint();
+		switch(tiles) {
-		paint.setColor(0xffe5e5e5);
+			case 1:
-		paint.setTextSize((float) (size * 0.9));
+				bitmap.eraseColor(colors[0]);
-		paint.setAntiAlias(true);
-		Rect rect = new Rect();
-		paint.getTextBounds(firstLetter, 0, 1, rect);
-		float width = paint.measureText(firstLetter);
-		canvas.drawText(firstLetter, (size / 2) - (width / 2), (size / 2)
-				+ (rect.height() / 2), paint);
 
+				textPaint.setTextSize((float) (size * 0.9));
+				textPaint.setAntiAlias(true);
+				rect = new Rect();
+				textPaint.getTextBounds(letters[0], 0, 1, rect);
+				width = textPaint.measureText(letters[0]);
+				canvas.drawText(letters[0], (size / 2) - (width / 2), (size / 2)
+						+ (rect.height() / 2), textPaint);
+				break;
+
+			case 2:
+				bitmap.eraseColor(fgColor);
+
+				tilePaint.setColor(colors[0]);
+				left = new Rect(0, 0, (size/2)-2, size);
+				canvas.drawRect(left, tilePaint);
+
+				tilePaint.setColor(colors[1]);
+				right = new Rect((size/2)+2, 0, size, size);
+				canvas.drawRect(right, tilePaint);
+
+				textPaint.setTextSize((float) (size * 0.9*0.5));
+				textPaint.setAntiAlias(true);
+				rect = new Rect();
+				textPaint.getTextBounds(letters[0], 0, 1, rect);
+				width = textPaint.measureText(letters[0]);
+				canvas.drawText(letters[0], (size / 4) - (width / 2), (size / 2)
+						+ (rect.height() / 2), textPaint);
+				textPaint.getTextBounds(letters[1], 0, 1, rect);
+				width = textPaint.measureText(letters[1]);
+				canvas.drawText(letters[1], (3 * size / 4) - (width / 2), (size / 2)
+						+ (rect.height() / 2), textPaint);
+				break;
+
+			case 3:
+				bitmap.eraseColor(fgColor);
+
+				tilePaint.setColor(colors[0]);
+				left = new Rect(0, 0, (size/2)-2, size);
+				canvas.drawRect(left, tilePaint);
+
+				tilePaint.setColor(colors[1]);
+				topRight = new Rect((size/2)+2, 0, size, (size/2 - 2));
+				canvas.drawRect(topRight, tilePaint);
+
+				tilePaint.setColor(colors[2]);
+				bottomRight = new Rect((size/2)+2, (size/2 + 2), size, size);
+				canvas.drawRect(bottomRight, tilePaint);
+
+				textPaint.setTextSize((float) (size * 0.9*0.5));
+				textPaint.setAntiAlias(true);
+				rect = new Rect();
+
+				textPaint.getTextBounds(letters[0], 0, 1, rect);
+				width = textPaint.measureText(letters[0]);
+				canvas.drawText(letters[0], (size / 4) - (width / 2), (size / 2)
+						+ (rect.height() / 2), textPaint);
+
+				textPaint.getTextBounds(letters[1], 0, 1, rect);
+				width = textPaint.measureText(letters[1]);
+				canvas.drawText(letters[1], (3 * size / 4) - (width / 2), (size / 4)
+						+ (rect.height() / 2), textPaint);
+
+				textPaint.getTextBounds(letters[2], 0, 1, rect);
+				width = textPaint.measureText(letters[2]);
+				canvas.drawText(letters[2], (3 * size / 4) - (width / 2), (3* size / 4)
+						+ (rect.height() / 2), textPaint);
+				break;
+
+			case 4:
+				bitmap.eraseColor(fgColor);
+
+				tilePaint.setColor(colors[0]);
+				topLeft = new Rect(0, 0, (size/2)-2, (size/2)-2);
+				canvas.drawRect(topLeft, tilePaint);
+
+				tilePaint.setColor(colors[1]);
+				bottomLeft = new Rect(0, (size/2)+2, (size/2)-2, size);
+				canvas.drawRect(bottomLeft, tilePaint);
+
+				tilePaint.setColor(colors[2]);
+				topRight = new Rect((size/2)+2, 0, size, (size/2 - 2));
+				canvas.drawRect(topRight, tilePaint);
+
+				tilePaint.setColor(colors[3]);
+				bottomRight = new Rect((size/2)+2, (size/2 + 2), size, size);
+				canvas.drawRect(bottomRight, tilePaint);
+
+				textPaint.setTextSize((float) (size * 0.9*0.5));
+				textPaint.setAntiAlias(true);
+				rect = new Rect();
+
+				textPaint.getTextBounds(letters[0], 0, 1, rect);
+				width = textPaint.measureText(letters[0]);
+				canvas.drawText(letters[0], (size / 4) - (width / 2), (size / 4)
+						+ (rect.height() / 2), textPaint);
+
+				textPaint.getTextBounds(letters[1], 0, 1, rect);
+				width = textPaint.measureText(letters[1]);
+				canvas.drawText(letters[1], (size / 4) - (width / 2), (3* size / 4)
+						+ (rect.height() / 2), textPaint);
+
+				textPaint.getTextBounds(letters[2], 0, 1, rect);
+				width = textPaint.measureText(letters[2]);
+				canvas.drawText(letters[2], (3 * size / 4) - (width / 2), (size / 4)
+						+ (rect.height() / 2), textPaint);
+
+				textPaint.getTextBounds(letters[3], 0, 1, rect);
+				width = textPaint.measureText(letters[3]);
+				canvas.drawText(letters[3], (3 * size / 4) - (width / 2), (3* size / 4)
+						+ (rect.height() / 2), textPaint);
+				break;
+
+			default:
+				bitmap.eraseColor(colors[0]);
+
+				textPaint.setTextSize((float) (size * 0.9));
+				textPaint.setAntiAlias(true);
+				rect = new Rect();
+				textPaint.getTextBounds(letters[0], 0, 1, rect);
+				width = textPaint.measureText(letters[0]);
+				canvas.drawText(letters[0], (size / 2) - (width / 2), (size / 2)
+						+ (rect.height() / 2), textPaint);
+				break;
+
+		}
 		return bitmap;
 	}
 
+	private static Bitmap getMucContactPicture(Conversation conversation, int size) {
+		List<User> members = conversation.getMucOptions().getUsers();
+		if (members.size() == 0) {
+			return getUnknownContactPicture(new String[]{conversation.getName(false)}, size);
+		}
+		String[] names = new String[members.size()+1];
+		names[0] = conversation.getMucOptions().getNick();
+		for(int i = 0; i < members.size(); ++i) {
+			names[i+1] = members.get(i).getName();
+		}
+
+		return getUnknownContactPicture(names, size);
+	}
+
 	public static Bitmap getContactPicture(Conversation conversation, int size, Context context) {
 		if(conversation.getMode() == Conversation.MODE_SINGLE) {
 			if (conversation.getContact() != null){
@@ -100,7 +247,7 @@ public class UIHelper {
 				return getContactPicture(conversation.getName(false), size);
 			}
 		} else{
-			return getContactPicture(conversation.getName(false), size);
+			return getMucContactPicture(conversation, size);
 		}
 	}
 
@@ -122,8 +269,9 @@ public class UIHelper {
 	}
 
 	public static Bitmap getContactPicture(String name, int size) {
-		return getUnknownContactPicture(name, size);
+		return getUnknownContactPicture(new String[]{name}, size);
 	}
+
 	public static Bitmap getErrorPicture(int size) {
 		Bitmap bitmap = Bitmap
 				.createBitmap(size, size, Bitmap.Config.ARGB_8888);