Difference between ContentObserver and DatasetObserver?

Question

What is difference between ContentObserver and DatasetObserver?

When one or another should be used?

I get Cursor with sing

Answer 1

To provide the supplement to ptc's answer, DataSetObserver is used for handling content changes in the Adapter, for example, it can be used for updating listview dynamically with Adapter. You can register a DataSetObserver using the Adapter#registerDataSetObserver() method.

DataSetObserver can also be used to observe the content changes in the Cursor in a similar fashion.