Update UserViewHolder class.

rocket-chat-android-widgets/src/main/java/chat/rocket/android/widget/message/autocomplete/user/UserViewHolder.java

 package chat.rocket.android.widget.message.autocomplete.user;
 
-import android.content.Context;
-import android.graphics.Typeface;
 import android.graphics.drawable.Drawable;
 import android.view.View;
 import android.widget.ImageView;
@@ -9,23 +7,16 @@ import android.widget.TextView;
 import chat.rocket.android.widget.AbsoluteUrl;
 import chat.rocket.android.widget.R;
 import chat.rocket.android.widget.RocketChatAvatar;
+import chat.rocket.android.widget.helper.UserAvatarHelper;
 import chat.rocket.android.widget.message.autocomplete.AutocompleteViewHolder;
-import com.amulyakhare.textdrawable.TextDrawable;
 import java.io.UnsupportedEncodingException;
 import java.net.URLEncoder;
 
 public class UserViewHolder extends AutocompleteViewHolder<UserItem> {
-
   private final TextView titleTextView;
   private final RocketChatAvatar avatar;
   private final ImageView status;
 
-  private static final int[] COLORS = new int[] {
-      0xFFF44336, 0xFFE91E63, 0xFF9C27B0, 0xFF673AB7, 0xFF3F51B5, 0xFF2196F3,
-      0xFF03A9F4, 0xFF00BCD4, 0xFF009688, 0xFF4CAF50, 0xFF8BC34A, 0xFFCDDC39,
-      0xFFFFC107, 0xFFFF9800, 0xFFFF5722, 0xFF795548, 0xFF9E9E9E, 0xFF607D8B
-  };
-
   public UserViewHolder(View itemView, final AutocompleteViewHolder.OnClickListener<UserItem> onClickListener) {
     super(itemView);
 
@@ -54,7 +45,9 @@ public class UserViewHolder extends AutocompleteViewHolder<UserItem> {
     }
 
     if (avatar != null) {
-      avatar.loadImage(getImageUrl(suggestion, userItem.getAbsoluteUrl()), getTextDrawable(itemView.getContext(), suggestion));
+      String absoluteUri = UserAvatarHelper.INSTANCE.getAbsoluteUri(userItem.getAbsoluteUrl(), suggestion);
+      Drawable placeholderDrawable = UserAvatarHelper.INSTANCE.getTextDrawable(suggestion, itemView.getContext());
+      avatar.loadImage(absoluteUri, placeholderDrawable);
     }
 
     if (status != null) {
@@ -68,50 +61,4 @@ public class UserViewHolder extends AutocompleteViewHolder<UserItem> {
     avatar.setVisibility(View.GONE);
     titleTextView.setText(R.string.no_user_found);
   }
-
-  private String getImageUrl(String username, AbsoluteUrl absoluteUrl) {
-    //from Rocket.Chat:packages/rocketchat-ui/lib/avatar.coffee
-    //REMARK! this is often SVG image! (see: Rocket.Chat:server/startup/avatar.coffee)
-    try {
-      final String avatarUrl = "/avatar/" + URLEncoder.encode(username, "UTF-8");
-      //  TODO why absoluteUrl is nullable? By allowing that, the app tries to load non-existing images
-      if (absoluteUrl == null) {
-        return avatarUrl;
-      }
-      return absoluteUrl.from(avatarUrl);
-    } catch (UnsupportedEncodingException exception) {
-      return null;
-    }
-  }
-
-  private Drawable getTextDrawable(Context context, String username) {
-    int round = (int) (4 * context.getResources().getDisplayMetrics().density);
-
-    return TextDrawable.builder()
-        .beginConfig()
-        .useFont(Typeface.SANS_SERIF)
-        .endConfig()
-        .buildRoundRect(getUsernameInitials(username), getUserAvatarBackgroundColor(username), round);
-  }
-
-  private String getUsernameInitials(String username) {
-    if (username.isEmpty()) {
-      return "?";
-    }
-
-    String[] splitUsername = username.split(".");
-    if (splitUsername.length > 1) {
-      return (splitUsername[0].substring(0, 1) + splitUsername[splitUsername.length - 1].substring(0, 1)).toUpperCase();
-    } else {
-      if (username.length() > 1) {
-        return username.substring(0, 2).toUpperCase();
-      } else {
-        return username.substring(0, 1).toUpperCase();
-      }
-    }
-  }
-
-  private int getUserAvatarBackgroundColor(String username) {
-    return COLORS[username.length() % COLORS.length];
-  }
 }
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