[android] add group members to memberlist when they join

briar-android/src/main/java/org/briarproject/briar/android/privategroup/memberlist/GroupMemberListActivity.java

@@ -7,6 +7,9 @@ import android.view.MenuItem;
 import android.widget.TextView;
 
 import org.briarproject.bramble.api.db.DbException;
+import org.briarproject.bramble.api.event.Event;
+import org.briarproject.bramble.api.event.EventBus;
+import org.briarproject.bramble.api.event.EventListener;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
@@ -15,6 +18,8 @@ import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.activity.BriarActivity;
 import org.briarproject.briar.android.controller.handler.UiResultExceptionHandler;
 import org.briarproject.briar.android.view.BriarRecyclerView;
+import org.briarproject.briar.api.privategroup.JoinMessageHeader;
+import org.briarproject.briar.api.privategroup.event.GroupMessageAddedEvent;
 
 import java.util.Collection;
 
@@ -23,10 +28,13 @@ import javax.inject.Inject;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
-public class GroupMemberListActivity extends BriarActivity {
+public class GroupMemberListActivity extends BriarActivity
+		implements EventListener {
 
 	@Inject
 	GroupMemberListController controller;
+	@Inject
+	EventBus eventBus;
 
 	private MemberListAdapter adapter;
 	private BriarRecyclerView list;
@@ -61,28 +69,32 @@ public class GroupMemberListActivity extends BriarActivity {
 	@Override
 	public void onStart() {
 		super.onStart();
-		controller.loadMembers(groupId,
+		loadMembers();
-				new UiResultExceptionHandler<Collection<MemberListItem>, DbException>(
+		eventBus.addListener(this);
-						this) {
-					@Override
-					public void onResultUi(Collection<MemberListItem> members) {
-						adapter.addAll(members);
-					}
-
-					@Override
-					public void onExceptionUi(DbException exception) {
-						handleDbException(exception);
-					}
-				});
 		list.startPeriodicUpdate();
 	}
 
 	@Override
 	public void onStop() {
 		super.onStop();
+		eventBus.removeListener(this);
 		list.stopPeriodicUpdate();
 	}
 
+	@Override
+	public void eventOccurred(Event e) {
+		if (e instanceof GroupMessageAddedEvent) {
+			// we can't use GroupInvitationResponseReceivedEvent, because
+			// a peer only becomes a member after joining the group by message
+			GroupMessageAddedEvent ge = (GroupMessageAddedEvent) e;
+			if (ge.getGroupId().equals(this.groupId) &&
+					ge.getHeader() instanceof JoinMessageHeader) {
+				loadMembers();
+			}
+		}
+		// TODO ContactConnectedEvent and ContactDisconnectedEvent
+	}
+
 	@Override
 	public boolean onOptionsItemSelected(MenuItem item) {
 		switch (item.getItemId()) {
@@ -94,4 +106,20 @@ public class GroupMemberListActivity extends BriarActivity {
 		}
 	}
 
+	private void loadMembers() {
+		controller.loadMembers(groupId,
+				new UiResultExceptionHandler<Collection<MemberListItem>, DbException>(
+						this) {
+					@Override
+					public void onResultUi(Collection<MemberListItem> members) {
+						adapter.addAll(members);
+					}
+
+					@Override
+					public void onExceptionUi(DbException exception) {
+						handleDbException(exception);
+					}
+				});
+	}
+
 }