altosui: add missing methods for Backend, fix BT code.

Signed-off-by: Mike Beattie <mike@ethernal.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/altosui/AltosUIPreferencesBackend.java b/altosui/AltosUIPreferencesBackend.java
index 16844f37..2b2769c2 100644
--- a/altosui/AltosUIPreferencesBackend.java
+++ b/altosui/AltosUIPreferencesBackend.java
@@ -73,6 +73,14 @@ public class AltosUIPreferencesBackend implements AltosPreferencesBackend {
 		return new AltosUIPreferencesBackend(_preferences.node(key));
 	}
 
+	public String[] keys() {
+		return _preferences.keys();
+	}
+
+	public void remove(String key) {
+		_preferences.remove(key);
+	}
+
 	public void    flush() {
 		try {
 			_preferences.flush();