Use two chars for avatars

Signed-off-by: tobiasKaminsky <tobias@kaminsky.me>

src/main/java/com/owncloud/android/ui/TextDrawable.java

@@ -35,11 +35,11 @@ import com.nextcloud.client.account.UserAccountManager;
 import com.owncloud.android.utils.BitmapUtils;
 import com.owncloud.android.utils.NextcloudServer;
 
-import java.io.UnsupportedEncodingException;
 import java.security.NoSuchAlgorithmException;
 import java.util.Locale;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.VisibleForTesting;
 
 /**
  * A Drawable object that draws text (1 character) on top of a circular/filled background.
@@ -97,13 +97,11 @@ public class TextDrawable extends Drawable {
      * @param account user account
      * @param radiusInDp  the circle's radius
      * @return the avatar as a TextDrawable
-     * @throws UnsupportedEncodingException if the charset is not supported when calculating the color values
      * @throws NoSuchAlgorithmException     if the specified algorithm is not available when calculating the color values
      */
     @NonNull
     @NextcloudServer(max = 12)
-    public static TextDrawable createAvatar(Account account, float radiusInDp) throws
-            NoSuchAlgorithmException {
+    public static TextDrawable createAvatar(Account account, float radiusInDp) throws NoSuchAlgorithmException {
         String username = UserAccountManager.getUsername(account);
         return createNamedAvatar(username, radiusInDp);
     }
@@ -115,13 +113,11 @@ public class TextDrawable extends Drawable {
      * @param userId      userId to use
      * @param radiusInDp  the circle's radius
      * @return the avatar as a TextDrawable
-     * @throws UnsupportedEncodingException if the charset is not supported when calculating the color values
      * @throws NoSuchAlgorithmException     if the specified algorithm is not available when calculating the color values
      */
     @NonNull
     @NextcloudServer(max = 12)
-    public static TextDrawable createAvatarByUserId(String userId, float radiusInDp) throws
-            NoSuchAlgorithmException {
+    public static TextDrawable createAvatarByUserId(String userId, float radiusInDp) throws NoSuchAlgorithmException {
         return createNamedAvatar(userId, radiusInDp);
     }
 
@@ -139,8 +135,24 @@ public class TextDrawable extends Drawable {
         int[] hsl = BitmapUtils.calculateHSL(name);
         int[] rgb = BitmapUtils.HSLtoRGB(hsl[0], hsl[1], hsl[2], 1);
 
-        return new TextDrawable(name.substring(0, 1).toUpperCase(Locale.getDefault()), rgb[0], rgb[1], rgb[2],
-                radiusInDp);
+        return new TextDrawable(extractCharsFromDisplayName(name), rgb[0], rgb[1], rgb[2],
+                                radiusInDp);
+    }
+
+    @VisibleForTesting
+    public static String extractCharsFromDisplayName(@NonNull String displayName) {
+        if (displayName.isEmpty()) {
+            return "";
+        }
+
+        String[] nameParts = displayName.split("\\s+");
+
+        StringBuilder firstTwoLetters = new StringBuilder();
+        for (int i = 0; i < Math.min(2, nameParts.length); i++) {
+            firstTwoLetters.append(nameParts[i].substring(0, 1).toUpperCase(Locale.getDefault()));
+        }
+
+        return firstTwoLetters.toString();
     }
 
     /**

src/test/java/com/owncloud/android/ui/TextDrawableTest.kt

@@ -0,0 +1,39 @@
+/*
+ *
+ * Nextcloud Android client application
+ *
+ * @author Tobias Kaminsky
+ * Copyright (C) 2020 Tobias Kaminsky
+ * Copyright (C) 2020 Nextcloud GmbH
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.owncloud.android.ui
+
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class TextDrawableTest {
+    @Test
+    fun twoDigitAvatars() {
+        assertEquals("A", TextDrawable.extractCharsFromDisplayName("Admin"))
+        assertEquals("TS", TextDrawable.extractCharsFromDisplayName("Test Server Admin"))
+        assertEquals("", TextDrawable.extractCharsFromDisplayName(""))
+        assertEquals("CP", TextDrawable.extractCharsFromDisplayName("Cormier Paulette"))
+        assertEquals("WB", TextDrawable.extractCharsFromDisplayName("winston brent"))
+        assertEquals("BJ", TextDrawable.extractCharsFromDisplayName("Baker James Lorena"))
+        assertEquals("BJ", TextDrawable.extractCharsFromDisplayName("Baker  James   Lorena"))
+        assertEquals("E", TextDrawable.extractCharsFromDisplayName("email@server.com"))
+    }
+}