Merge pull request #8 from tarekFerdous/branch_SP

Manually called Thread.interrupt() to re-interrupt the current thread.

src/main/java/de/dennisguse/opentracks/io/file/exporter/KmzTrackExporter.java

@@ -83,6 +83,7 @@ public boolean writeTrack(List<Track> tracks, @NonNull OutputStream outputStream
             return true;
         } catch (InterruptedException | IOException e) {
             Log.e(TAG, "Unable to write track", e);
+            Thread.currentThread().interrupt();
             return false;
         }
     }