show encryption type in warned/red messages

src/main/java/eu/siacs/conversations/ui/adapter/MessageAdapter.java

@@ -36,6 +36,7 @@ import eu.siacs.conversations.entities.Message;
 import eu.siacs.conversations.entities.Message.FileParams;
 import eu.siacs.conversations.entities.Transferable;
 import eu.siacs.conversations.ui.ConversationActivity;
+import eu.siacs.conversations.utils.CryptoHelper;
 import eu.siacs.conversations.utils.GeoHelper;
 import eu.siacs.conversations.utils.UIHelper;
 
@@ -462,6 +463,7 @@ public class MessageAdapter extends ArrayAdapter<Message> {
 						.findViewById(R.id.message_time);
 					viewHolder.indicatorReceived = (ImageView) view
 						.findViewById(R.id.indicator_received);
+					viewHolder.encryption = (TextView) view.findViewById(R.id.message_encryption);
 					break;
 				case STATUS:
 					view = activity.getLayoutInflater().inflate(R.layout.message_status, parent, false);
@@ -585,8 +587,11 @@ public class MessageAdapter extends ArrayAdapter<Message> {
 				} else {
 					viewHolder.message_box.setBackgroundResource(R.drawable.message_bubble_received);
 				}
+				viewHolder.encryption.setVisibility(View.GONE);
 			} else {
 				viewHolder.message_box.setBackgroundResource(R.drawable.message_bubble_received_warning);
+				viewHolder.encryption.setVisibility(View.VISIBLE);
+				viewHolder.encryption.setText(CryptoHelper.encryptionTypeToText(message.getEncryption()));
 			}
 		}
 
@@ -667,5 +672,6 @@ public class MessageAdapter extends ArrayAdapter<Message> {
 		protected TextView messageBody;
 		protected ImageView contact_picture;
 		protected TextView status_message;
+		protected TextView encryption;
 	}
 }

src/main/java/eu/siacs/conversations/utils/CryptoHelper.java

@@ -23,6 +23,8 @@ import java.util.LinkedHashSet;
 import java.util.List;
 
 import eu.siacs.conversations.Config;
+import eu.siacs.conversations.R;
+import eu.siacs.conversations.entities.Message;
 import eu.siacs.conversations.xmpp.jid.InvalidJidException;
 import eu.siacs.conversations.xmpp.jid.Jid;
 
@@ -164,4 +166,17 @@ public final class CryptoHelper {
 			return null;
 		}
 	}
+
+	public static int encryptionTypeToText(int encryption) {
+		switch (encryption) {
+			case Message.ENCRYPTION_OTR:
+				return R.string.encryption_choice_otr;
+			case Message.ENCRYPTION_AXOLOTL:
+				return R.string.encryption_choice_omemo;
+			case Message.ENCRYPTION_NONE:
+				return R.string.encryption_choice_unencrypted;
+			default:
+				return R.string.encryption_choice_pgp;
+		}
+	}
 }

src/main/res/layout/message_received.xml

@@ -72,6 +72,17 @@
                 android:orientation="horizontal"
                 android:paddingBottom="2dp">
 
+                <TextView
+                    android:id="@+id/message_encryption"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_gravity="center_vertical"
+                    android:gravity="center_vertical"
+                    android:layout_marginRight="4sp"
+                    android:textColor="@color/white70"
+                    android:textStyle="bold"
+                    android:textSize="?attr/TextSizeInfo" />
+
                 <ImageView
                     android:id="@+id/security_indicator"
                     android:layout_width="?attr/TextSizeInfo"