Are the activities all in the same application?  Same task?  It seems
to me that you could just store the data in a static variable
accessible by all of the activities.  Am I missing something?

public class MainActivity extends Activity {
  ...
  static MyDataStructure dataStruct = null;
  ...
  public void onCreate(Bundle state) {
    ...
    dataStruct = ReadData();
  }
}

...

public class AnotherActivity extends Activity {
  ...
  void SomeMethod() {
    DoSomethingWithData(MainActivity.dataStruct);
  }
}
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