Prevent screensaver while route navigation is active

src/mahomaps/DeviceControlInvoker.java

@@ -0,0 +1,28 @@
+package mahomaps;
+
+import com.nokia.mid.ui.DeviceControl;
+
+public class DeviceControlInvoker {
+
+	public static boolean supported;
+
+	static {
+		try {
+			if (System.getProperty("com.nokia.mid.ui.version") != null &&
+					System.getProperty("com.nokia.mid.ui.screensaverprevention") != null) {
+				Class.forName("com.nokia.mid.ui.DeviceControl");
+				supported = true;
+			}
+		} catch (Exception e) {
+		}
+	}
+
+	public static void resetUserInactivityTime() {
+		if (!supported) return;
+		try {
+			DeviceControl.resetUserInactivityTime();
+		} catch (Throwable e) {
+		}
+	}
+
+}

src/mahomaps/screens/MapCanvas.java

@@ -9,6 +9,7 @@
 import javax.microedition.lcdui.Graphics;
 import javax.microedition.lcdui.TextBox;
 
+import mahomaps.DeviceControlInvoker;
 import mahomaps.FpsLimiter;
 import mahomaps.MahoMapsApp;
 import mahomaps.Settings;
@@ -59,6 +60,8 @@ public class MapCanvas extends MultitouchCanvas implements CommandListener {
 	public final FpsLimiter repaintGate = new FpsLimiter();
 	private Graphics cachedGraphics;
 
+	private long lastResetTime;
+
 	public MapCanvas(TilesProvider tiles) {
 		this.tiles = tiles;
 		setFullScreenMode(true);
@@ -325,6 +328,10 @@ public void run() throws InterruptedException {
 				repaint(g);
 				flushGraphics();
 				repaintGate.End(rt != null ? 33 : 2000);
+				if (rt != null && System.currentTimeMillis() - lastResetTime > 15000L) {
+					DeviceControlInvoker.resetUserInactivityTime();
+					lastResetTime = System.currentTimeMillis();
+				}
 			}
 		}
 	}