catches a crash that could happen when a location fix was acquired too slow (see #3)

app/build.gradle

@@ -26,5 +26,5 @@ dependencies {
     compile 'com.android.support:appcompat-v7:24.2.1'
     compile 'com.android.support:design:24.2.1'
     compile 'org.osmdroid:osmdroid-android:5.2@aar'
-    compile 'com.google.code.gson:gson:2.4'
+    compile 'com.google.code.gson:gson:2.7'
 }

app/src/main/java/org/y20k/trackbook/MainActivity.java

@@ -361,11 +361,19 @@ public class MainActivity extends AppCompatActivity implements TrackbookKeys {
             // get last location from MainActivity Fragment
             Location lastLocation = mMainActivityMapFragment.getCurrentBestLocation();
 
+            if (lastLocation != null) {
                 // start tracker service
                 Intent intent = new Intent(this, TrackerService.class);
                 intent.setAction(ACTION_START);
                 intent.putExtra(EXTRA_LAST_LOCATION, lastLocation);
                 startService(intent);
+            } else {
+                Toast.makeText(this, getString(R.string.toast_message_location_services_not_ready), Toast.LENGTH_LONG).show();
+                // change state back
+                mTrackerServiceRunning = false;
+                setFloatingActionButtonState();
+            }
+
         }
 
         // update tracking state in MainActivityMapFragment

app/src/main/java/org/y20k/trackbook/MainActivityMapFragment.java

@@ -299,6 +299,10 @@ public class MainActivityMapFragment extends Fragment implements TrackbookKeys {
                     // app does not have any location fix
                     mCurrentBestLocation = LocationHelper.determineLastKnownLocation(mLocationManager);
                 }
+
+
+                // check if really got a position
+                if (mCurrentBestLocation != null) {
                     position = convertToGeoPoint(mCurrentBestLocation);
 
                     // center map on current position
@@ -316,8 +320,14 @@ public class MainActivityMapFragment extends Fragment implements TrackbookKeys {
                     }
                     locationInfo = " " + locationAgeString + " | " + mCurrentBestLocation.getProvider();
                     Toast.makeText(mActivity, mActivity.getString(R.string.toast_message_last_location) + locationInfo, Toast.LENGTH_LONG).show();
-
                     return true;
+                } else {
+                    Toast.makeText(mActivity, mActivity.getString(R.string.toast_message_location_services_not_ready), Toast.LENGTH_LONG).show();
+                    return false;
+                }
+
+
+
 
             // CASE DEFAULT
             default:
@@ -374,6 +384,7 @@ public class MainActivityMapFragment extends Fragment implements TrackbookKeys {
 
     /* Removes track crumbs from map */
     public void clearMap() {
+// TODO clear map or clear intent
         if (mTrackOverlay != null) {
             Toast.makeText(mActivity, mActivity.getString(R.string.toast_message_clear_map), Toast.LENGTH_LONG).show();
             mMapView.getOverlays().remove(mTrackOverlay);

app/src/main/res/values-de/strings.xml

@@ -16,8 +16,8 @@
     <string name="tab_last_track">LETZTE AUFZEICHNUNG</string>
 
     <!-- notification -->
-    <string name="notification_title_trackbook_not_running">Trackbook ist aktiv</string>
+    <string name="notification_title_trackbook_not_running">Trackbook ist inaktiv</string>
-    <string name="notification_title_trackbook_running">Trackbook ist inaktiv</string>
+    <string name="notification_title_trackbook_running">Trackbook ist aktiv</string>
     <string name="notification_stop">Stopp</string>
     <string name="notification_swipe_to_clear_map">(Ausblenden setzt Kartenansicht zurück)</string>
     <string name="notification_content_duration">Dauer</string>
@@ -34,6 +34,7 @@
     <string name="toast_message_no_external_storage">Zugriff auf den externen Speicher verweigert.</string>
     <string name="toast_message_location_offline">Standortdienste sind deaktiviert. Trackbook kann nicht aufzeichnen.</string>
     <string name="toast_message_acquiring_location">Suche aktuellen Standort.</string>
+    <string name="toast_message_location_services_not_ready">Standortdienste noch nicht bereit. Bitte erneut versuchen.</string>
     <string name="toast_message_last_location">Letzte Position:</string>
     <string name="toast_message_clear_map">Kartenansicht wird zurückgesetzt</string>
     <string name="toast_message_last_location_age_one_hour">über eine Stunde</string>

app/src/main/res/values/strings.xml

@@ -34,6 +34,7 @@
     <string name="toast_message_no_external_storage">Unable to access external storage.</string>
     <string name="toast_message_location_offline">Location is turned off. Trackbook will not work.</string>
     <string name="toast_message_acquiring_location">Acquiring current location.</string>
+    <string name="toast_message_location_services_not_ready">Location services not ready. Please retry.</string>
     <string name="toast_message_last_location">Last location:</string>
     <string name="toast_message_clear_map">Clearing map.</string>
     <string name="toast_message_last_location_age_one_hour">over one hour</string>