add avatar icons on sharee list

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

src/main/java/com/owncloud/android/ui/adapter/UserListAdapter.java

@@ -50,6 +50,7 @@ import com.owncloud.android.ui.dialog.ExpirationDatePickerDialogFragment;
 import com.owncloud.android.ui.fragment.util.SharingMenuHelper;
 import com.owncloud.android.utils.DisplayUtils;
 import com.owncloud.android.utils.ThemeUtils;
+import com.owncloud.android.utils.DisplayUtils;
 
 import java.security.NoSuchAlgorithmException;
 import java.util.List;
@@ -377,6 +378,23 @@ public class UserListAdapter extends RecyclerView.Adapter<UserListAdapter.UserVi
         }
     }
 
+    @Override
+    public void avatarGenerated(Drawable avatarDrawable, Object callContext) {
+        if (callContext instanceof ImageView) {
+            ImageView iv = (ImageView) callContext;
+            iv.setImageDrawable(avatarDrawable);
+        }
+    }
+
+    @Override
+    public boolean shouldCallGeneratedCallback(String tag, Object callContext) {
+        if (callContext instanceof ImageView) {
+            ImageView iv = (ImageView) callContext;
+            return String.valueOf(iv.getTag()).equals(tag);
+        }
+        return false;
+    }
+
     public interface ShareeListAdapterListener {
         /**
          * unshare with given sharee {@link OCShare}.

src/main/java/com/owncloud/android/utils/BitmapUtils.java

@@ -34,9 +34,7 @@ import com.owncloud.android.lib.common.utils.Log_OC;
 
 import org.apache.commons.codec.binary.Hex;
 
-import java.io.UnsupportedEncodingException;
 import java.security.MessageDigest;
-import java.security.NoSuchAlgorithmException;
 import java.util.Locale;
 
 /**