The best way to share data between activities in Android

  When programming Android, the question that what is the best design pattern for this problem is always in mind. Among the questions, it is most common that the best way to share data between activities. There are many solutions for this question.(http://stackoverflow.com/questions/4878159/android-whats-the-best-way-to-share-data-between-activities) I usually use a singleton class of the solutions.