diff -r 7831c84cc644 -r 33924ff4af50 project_files/Android-build/SDL-android-project/src/org/hedgewars/hedgeroid/util/CalmDownHandler.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/project_files/Android-build/SDL-android-project/src/org/hedgewars/hedgeroid/util/CalmDownHandler.java	Wed Aug 22 01:30:56 2012 +0200
@@ -0,0 +1,62 @@
+/*
+ * Hedgewars for Android. An Android port of Hedgewars, a free turn based strategy game
+ * Copyright (C) 2012 Simeon Maxein <smaxein@googlemail.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+package org.hedgewars.hedgeroid.util;
+
+import android.os.Handler;
+import android.os.Looper;
+import android.os.Message;
+
+/**
+ * This class allows you to define a runnable that is called when there has been
+ * no activity for a set amount of time, where activity is determined by calls
+ * to the activity() method of the handler. It is used to update the map preview
+ * when there have been no updates to the relevant map information for a time,
+ * to prevent triggering several updates at once when different parts of the
+ * information change.
+ */
+public final class CalmDownHandler extends Handler {
+	int runningMessagesCounter = 0;
+	final Runnable inactivityRunnable;
+	final long inactivityMs;
+	boolean stopped;
+
+	public CalmDownHandler(Looper looper, Runnable runnable, long inactivityMs) {
+		super(looper);
+		this.inactivityRunnable = runnable;
+		this.inactivityMs = inactivityMs;
+	}
+	
+	public void activity() {
+		runningMessagesCounter++;
+		sendMessageDelayed(obtainMessage(), inactivityMs);
+	}
+	
+	@Override
+	public void handleMessage(Message msg) {
+		runningMessagesCounter--;
+		if(runningMessagesCounter==0 && !stopped) {
+			inactivityRunnable.run();
+		}
+	}
+	
+	public void stop() {
+		stopped = true;
+	}
+}
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