Add menu option to view photo in gallery

MyTracks/res/menu/marker_detail.xml

@@ -30,4 +30,9 @@ limitations under the License.
     android:id="@+id/marker_detail_delete"
     android:showAsAction="ifRoom"
     android:title="@string/menu_delete"/>
+  <item
+    android:icon="@drawable/ic_menu_view_photo"
+    android:id="@+id/marker_detail_view_photo"
+    android:showAsAction="ifRoom"
+    android:title="@string/menu_view_photo"/>
 </menu>

MyTracks/res/values/strings.xml

@@ -1240,6 +1240,12 @@ limitations under the License.
       Character limit: ~20 (1 line)">
     Terrain
   </string>
+  <string name="menu_view_photo"
+    translation_description="In the menu, to view a photo.
+
+      Character limit: ~20 (1 line)">
+    View photo
+  </string>
   <string name="menu_voice_frequency"
     translation_description="In the menu, to configure the voice frequency, how frequent to announce
       status.

MyTracks/src/com/google/android/apps/mytracks/fragments/MarkerDetailFragment.java

@@ -179,6 +179,10 @@ public class MarkerDetailFragment extends Fragment {
 
     menu.findItem(R.id.marker_detail_edit).setVisible(!isSharedWithMe);
     menu.findItem(R.id.marker_detail_delete).setVisible(!isSharedWithMe);
+
+    String photoUrl = waypoint.getPhotoUrl();
+    boolean hasPhoto = photoUrl != null && !photoUrl.equals("");
+    menu.findItem(R.id.marker_detail_view_photo).setVisible(hasPhoto);
   }
 
   @Override
@@ -202,6 +206,12 @@ public class MarkerDetailFragment extends Fragment {
         DeleteMarkerDialogFragment.newInstance(new long[] { markerId })
             .show(getChildFragmentManager(), DeleteMarkerDialogFragment.DELETE_MARKER_DIALOG_TAG);
         return true;
+      case R.id.marker_detail_view_photo:
+        intent = new Intent();
+        intent.setAction(Intent.ACTION_VIEW);
+        intent.setDataAndType(Uri.parse(waypoint.getPhotoUrl()), "image/*");
+        startActivity(intent);
+        return true;
       default:
         return super.onOptionsItemSelected(item);
     }