fix: do not try to navigate towards unknown (null) coordinates

2 files changed, 16 insertions, 1 deletions

diff --git a/main/res/values/strings.xml b/main/res/values/strings.xml
index 012bfe1..959599d 100644
--- a/main/res/values/strings.xml
+++ b/main/res/values/strings.xml
@@ -899,6 +899,7 @@
     <string name="destination_set">Set destination</string>
     <string name="navigation_direct_navigation">Direct Navigation</string>
     <string name="navigation_target">Target</string>
+    <string name="err_nav_no_coordinates">Cannot start navigation with no coordinates</string>
 
     <!-- license -->
     <string name="license">License</string>
diff --git a/main/src/cgeo/geocaching/apps/cache/navi/AbstractPointNavigationApp.java b/main/src/cgeo/geocaching/apps/cache/navi/AbstractPointNavigationApp.java
index a3ea57e..7542e24 100644
--- a/main/src/cgeo/geocaching/apps/cache/navi/AbstractPointNavigationApp.java
+++ b/main/src/cgeo/geocaching/apps/cache/navi/AbstractPointNavigationApp.java
@@ -1,8 +1,11 @@
 package cgeo.geocaching.apps.cache.navi;
 
 import cgeo.geocaching.Geocache;
+import cgeo.geocaching.R;
 import cgeo.geocaching.Waypoint;
+import cgeo.geocaching.activity.ActivityMixin;
 import cgeo.geocaching.apps.AbstractApp;
+import cgeo.geocaching.geopoint.Geopoint;
 
 import android.app.Activity;
 
@@ -21,11 +24,22 @@ abstract class AbstractPointNavigationApp extends AbstractApp implements CacheNa
 
     @Override
     public void navigate(Activity activity, Geocache cache) {
-        navigate(activity, cache.getCoords());
+        final Geopoint coords = cache.getCoords();
+        if (coords != null) {
+            navigate(activity, coords);
+        } else {
+            ActivityMixin.showToast(activity, activity.getResources().getString(R.string.err_nav_no_coordinates));
+        }
     }
 
     @Override
     public void navigate(Activity activity, Waypoint waypoint) {
+        final Geopoint coords = waypoint.getCoords();
+        if (coords != null) {
+            navigate(activity, coords);
+        } else {
+            ActivityMixin.showToast(activity, activity.getResources().getString(R.string.err_nav_no_coordinates));
+        }
         navigate(activity, waypoint.getCoords());
     }