diff -r 45b9f25ff611 -r 2fb781bbdd51 project_files/Android-build/SDL-android-project/src/org/hedgewars/hedgeroid/netplay/ObservableTreeMap.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/project_files/Android-build/SDL-android-project/src/org/hedgewars/hedgeroid/netplay/ObservableTreeMap.java	Mon Aug 06 22:39:36 2012 +0200
@@ -0,0 +1,43 @@
+package org.hedgewars.hedgeroid.netplay;
+
+import java.util.Collections;
+import java.util.Map;
+import java.util.TreeMap;
+
+import android.database.DataSetObservable;
+
+public class ObservableTreeMap<K,V> extends DataSetObservable {
+	private final Map<K, V> map = new TreeMap<K, V>();
+	
+	public void replaceContent(Map<? extends K, ? extends V> newMap) {
+		map.clear();
+		map.putAll(newMap);
+		notifyChanged();
+	}
+	
+	public void put(K key, V value) {
+		map.put(key, value);
+		notifyChanged();
+	}
+	
+	public V get(K key) {
+		return map.get(key);
+	}
+	
+	public void remove(K key) {
+		if(map.remove(key) != null) {
+			notifyChanged();
+		}
+	}
+	
+	public void clear() {
+		if(!map.isEmpty()) {
+			map.clear();
+			notifyChanged();
+		}
+	}
+	
+	public Map<K, V> getMap() {
+		return Collections.unmodifiableMap(map);
+	}
+}