title: HashMap, SparseArray in Android: multithread a concern?
body: <p>I know neither HashMap nor SparseArray are threadsafe. Do I have to worry about that if I have a central data repository as HashMap which can be accessed by the activity and potentially by an AsyncTask?</p>
  
  <p>Would it be advisable to use a HashTable or better ConcurrentHashMap to be on the safe side?</p>