tweaks to notices

- new notice when entering info pane (sharing/navigation)
- mention NFC in general how-to
- add some punctuation

Fixes #750

mobile/src/com/cradle/iitc_mobile/IITC_NavigationHelper.java

@@ -242,6 +242,7 @@ public class IITC_NavigationHelper extends ActionBarDrawerToggle implements OnIt
     public void switchTo(final Pane pane) {
         mPane = pane;
 
+        if (pane.equals(Pane.INFO)) mNotificationHelper.showNotice(IITC_NotificationHelper.NOTICE_SHARING);
         updateViews();
     }
 

mobile/src/com/cradle/iitc_mobile/IITC_NotificationHelper.java

@@ -18,7 +18,8 @@ public class IITC_NotificationHelper {
     public static final int NOTICE_INFO = 1 << 1;
     public static final int NOTICE_PANES = 1 << 2;
     public static final int NOTICE_EXTPLUGINS = 1 << 3;
-    // next one would be 1<<4; (this results in 1,2,4,8,...)
+    public static final int NOTICE_SHARING = 1 << 4;
+    // next one would be 1<<5; (this results in 1,2,4,8,...)
 
     private final Activity mActivity;
     private final SharedPreferences mPrefs;
@@ -48,6 +49,9 @@ public class IITC_NotificationHelper {
                 text = String.format(text, Environment.getExternalStorageDirectory().getPath()
                         + "/IITC_Mobile/plugins/");
                 break;
+            case NOTICE_SHARING:
+                text = mActivity.getString(R.string.notice_sharing);
+                break;
             default:
                 return;
         }