30.4 Adding and Managing Fragments in Code

The ease of adding a fragment to an activity via the activity’s XML layout file comes at the cost of the activity not being able to remove the fragment at runtime. In order to achieve full dynamic control of fragments during runtime, those activities must be added via code. This has the advantage that the fragments can be added, removed and even made to replace one another dynamically while the application is running.

When using code to manage fragments, the fragment itself will still consist of an XML layout file and a corresponding class. The difference comes when working with the fragment within the hosting activity. There is a standard sequence of steps when adding a fragment to an activity using code:

1. Create an instance of the fragment’s class.

2. Pass any additional intent arguments through to the class instance.

3. Obtain a reference to the fragment manager instance.

4. Call the beginTransaction() method...