altoslib: Make AltosPreferencesBackend abstract. Add set/put Serializable

[fw/altos] / altosdroid / src / org / altusmetrum / AltosDroid / AltosDroidPreferencesBackend.java

diff --git a/altosdroid/src/org/altusmetrum/AltosDroid/AltosDroidPreferencesBackend.java b/altosdroid/src/org/altusmetrum/AltosDroid/AltosDroidPreferencesBackend.java
index c2db3774bed213172ee1c0003344ea8e5eebd196..5c7ec513eb19f78e55f5c3c670d97378094c87dd 100644 (file)
--- a/altosdroid/src/org/altusmetrum/AltosDroid/AltosDroidPreferencesBackend.java
+++ b/altosdroid/src/org/altusmetrum/AltosDroid/AltosDroidPreferencesBackend.java
@@ -26,7 +26,7 @@ import android.util.*;
 
 import org.altusmetrum.altoslib_10.*;
 
-public class AltosDroidPreferencesBackend implements AltosPreferencesBackend {
+public class AltosDroidPreferencesBackend extends AltosPreferencesBackend {
        public final static String        NAME    = "org.altusmetrum.AltosDroid";
        private Context                   context = null;
        private SharedPreferences         prefs   = null;