1 files changed, 12 insertions, 6 deletions
diff --git a/main/src/cgeo/geocaching/sensors/DirectionProvider.java b/main/src/cgeo/geocaching/sensors/DirectionProvider.java
index 44732f7..788d5bd 100644
--- a/main/src/cgeo/geocaching/sensors/DirectionProvider.java
+++ b/main/src/cgeo/geocaching/sensors/DirectionProvider.java
@@ -1,5 +1,6 @@
 package cgeo.geocaching.sensors;
 
+import cgeo.geocaching.CgeoApplication;
 import cgeo.geocaching.utils.AngleUtils;
 import cgeo.geocaching.utils.StartableHandlerThread;
 
@@ -8,7 +9,6 @@ import rx.Observable.OnSubscribe;
 import rx.Subscriber;
 import rx.subjects.BehaviorSubject;
 
-import android.app.Activity;
 import android.content.Context;
 import android.hardware.Sensor;
 import android.hardware.SensorEvent;
@@ -17,11 +17,14 @@ import android.hardware.SensorManager;
 import android.os.Handler;
 import android.os.Process;
 import android.view.Surface;
+import android.view.WindowManager;
 
 public class DirectionProvider {
 
     private static final BehaviorSubject<Float> subject = BehaviorSubject.create(0.0f);
 
+    private static final WindowManager windowManager = (WindowManager) CgeoApplication.getInstance().getSystemService(Context.WINDOW_SERVICE);
+
     static class Listener implements SensorEventListener, StartableHandlerThread.Callback {
 
         private int count = 0;
@@ -85,17 +88,20 @@ public class DirectionProvider {
     /**
      * Take the phone rotation (through a given activity) in account and adjust the direction.
      *
-     * @param activity the activity to consider when computing the rotation
      * @param direction the unadjusted direction in degrees, in the [0, 360[ range
      * @return the adjusted direction in degrees, in the [0, 360[ range
      */
 
-    public static float getDirectionNow(final Activity activity, final float direction) {
-        return AngleUtils.normalize(direction + getRotationOffset(activity));
+    public static float getDirectionNow(final float direction) {
+        return AngleUtils.normalize(direction + getRotationOffset());
+    }
+
+    static float reverseDirectionNow(final float direction) {
+        return AngleUtils.normalize(direction - getRotationOffset());
     }
 
-    private static int getRotationOffset(final Activity activity) {
-        switch (activity.getWindowManager().getDefaultDisplay().getRotation()) {
+    private static int getRotationOffset() {
+        switch (windowManager.getDefaultDisplay().getRotation()) {
             case Surface.ROTATION_90:
                 return 90;
             case Surface.ROTATION_180: