Update fallback avatars.

res/drawable/avatar_gradient_dark.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="oval">
+
+    <gradient
+        android:angle="270"
+        android:startColor="@color/transparent_black_30"
+        android:endColor="@color/transparent_black" />
+
+</shape>

res/drawable/avatar_gradient_light.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="oval">
+
+    <gradient
+        android:angle="270"
+        android:startColor="@color/transparent_white_30"
+        android:endColor="@color/transparent" />
+
+</shape>

src/org/thoughtcrime/securesms/color/MaterialColor.java

@@ -68,6 +68,10 @@ public enum MaterialColor {
     return context.getResources().getColor(mainColor);
   }
 
+  public @ColorInt int toAvatarColor(@NonNull Context context) {
+    return context.getResources().getColor(isDarkTheme(context) ? shadeColor : mainColor);
+  }
+
   public @ColorInt int toActionBarColor(@NonNull Context context) {
     return context.getResources().getColor(mainColor);
   }

src/org/thoughtcrime/securesms/contacts/avatars/GeneratedContactPhoto.java

@@ -2,20 +2,25 @@ package org.thoughtcrime.securesms.contacts.avatars;
 
 import android.content.Context;
 import android.graphics.Color;
+import android.graphics.Typeface;
 import android.graphics.drawable.Drawable;
+import android.graphics.drawable.LayerDrawable;
 import android.support.annotation.NonNull;
-import android.support.v4.content.ContextCompat;
 import android.support.v7.content.res.AppCompatResources;
+import android.text.TextUtils;
 
 import com.amulyakhare.textdrawable.TextDrawable;
 
 import org.thoughtcrime.securesms.R;
+import org.thoughtcrime.securesms.util.ThemeUtil;
+import org.thoughtcrime.securesms.util.ViewUtil;
 
 import java.util.regex.Pattern;
 
 public class GeneratedContactPhoto implements FallbackContactPhoto {
 
-  private static final Pattern PATTERN = Pattern.compile("[^\\p{L}\\p{Nd}\\p{P}\\p{S}]+");
+  private static final Pattern  PATTERN  = Pattern.compile("[^\\p{L}\\p{Nd}\\p{P}\\p{S}]+");
+  private static final Typeface TYPEFACE = Typeface.create("sans-serif-medium", Typeface.NORMAL);
 
   private final String name;
 
@@ -32,22 +37,39 @@ public class GeneratedContactPhoto implements FallbackContactPhoto {
   public Drawable asDrawable(Context context, int color, boolean inverted) {
     int targetSize = context.getResources().getDimensionPixelSize(R.dimen.contact_photo_target_size);
 
-    return TextDrawable.builder()
-                       .beginConfig()
-                       .width(targetSize)
-                       .height(targetSize)
-                       .textColor(inverted ? color : Color.WHITE)
-                       .endConfig()
-                       .buildRound(getCharacter(name), inverted ? Color.WHITE : color);
+    Drawable base = TextDrawable.builder()
+                                .beginConfig()
+                                .width(targetSize)
+                                .height(targetSize)
+                                .useFont(TYPEFACE)
+                                .fontSize(ViewUtil.dpToPx(context, 24))
+                                .textColor(inverted ? color : Color.WHITE)
+                                .endConfig()
+                                .buildRound(getAbbreviation(name), inverted ? Color.WHITE : color);
+
+    Drawable gradient = context.getResources().getDrawable(ThemeUtil.isDarkTheme(context) ? R.drawable.avatar_gradient_dark
+                                                                                          : R.drawable.avatar_gradient_light);
+
+    return new LayerDrawable(new Drawable[] { base, gradient });
   }
 
-  private String getCharacter(String name) {
-    String cleanedName = PATTERN.matcher(name).replaceFirst("");
+  private String getAbbreviation(String name) {
+    String[]      parts   = name.split(" ");
+    StringBuilder builder = new StringBuilder();
+    int           count   = 0;
+
+    for (int i = 0; i < parts.length && count < 2; i++) {
+      String cleaned = PATTERN.matcher(parts[i]).replaceFirst("");
+      if (!TextUtils.isEmpty(cleaned)) {
+        builder.appendCodePoint(cleaned.codePointAt(0));
+        count++;
+      }
+    }
 
-    if (cleanedName.isEmpty()) {
+    if (builder.length() == 0) {
       return "#";
     } else {
-      return new StringBuilder().appendCodePoint(cleanedName.codePointAt(0)).toString();
+      return builder.toString();
     }
   }
 

src/org/thoughtcrime/securesms/contacts/avatars/ResourceContactPhoto.java

@@ -12,6 +12,9 @@ import android.widget.ImageView;
 import com.amulyakhare.textdrawable.TextDrawable;
 import com.makeramen.roundedimageview.RoundedDrawable;
 
+import org.thoughtcrime.securesms.R;
+import org.thoughtcrime.securesms.util.ThemeUtil;
+
 public class ResourceContactPhoto implements FallbackContactPhoto {
 
   private final int resourceId;
@@ -42,7 +45,10 @@ public class ResourceContactPhoto implements FallbackContactPhoto {
       foreground.setColorFilter(color, PorterDuff.Mode.SRC_ATOP);
     }
 
-    return new ExpandingLayerDrawable(new Drawable[] {background, foreground});
+    Drawable gradient = context.getResources().getDrawable(ThemeUtil.isDarkTheme(context) ? R.drawable.avatar_gradient_dark
+                                                                                          : R.drawable.avatar_gradient_light);
+
+    return new ExpandingLayerDrawable(new Drawable[] {background, foreground, gradient});
   }
 
   @Override

src/org/thoughtcrime/securesms/recipients/Recipient.java

@@ -419,7 +419,7 @@ public class Recipient implements RecipientModifiedListener {
   }
 
   public synchronized @NonNull Drawable getFallbackContactPhotoDrawable(Context context, boolean inverted) {
-    return getFallbackContactPhoto().asDrawable(context, getColor().toConversationColor(context), inverted);
+    return getFallbackContactPhoto().asDrawable(context, getColor().toAvatarColor(context), inverted);
   }
 
   public synchronized @NonNull FallbackContactPhoto getFallbackContactPhoto() {