How to Dynamically Replace Fragments within an Android Activity Group?

Fragment Replacement within an Activity Group

In Android development, replacing fragments within an activity group requires a different approach from standard activities. Here's how to overcome the issue and successfully replace a fragment:

Understanding the Limitation:

Fragments embedded in XML cannot be replaced dynamically. To enable fragment replacement, they must be added dynamically during runtime.

Dynamic Fragment Replacement:

To replace an existing fragment with a new one:

1. Create a new fragment instance:

   Fragment newFragment = new SectionDescriptionFragment();

2. Initiate a fragment transaction:

   FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();

3. Replace the target container with the new fragment:

   transaction.replace(R.id.fragment_container, newFragment);

4. Optionally, add the transaction to the back stack for navigational history:

   transaction.addToBackStack(null);

5. Execute the transaction:

   transaction.commit();

Ensure Container ID:

The fragment container should have a unique ID in your XML layout. This ID should be used when replacing the fragment.

Call in Response to Action:

In your case, you wish to replace the fragment when an item in the horizontal scroll view is tapped. Call the fragment replacement code within the click listener for the item.

By following these steps, you can successfully replace fragments within an activity group and maintain state changes as required. Remember to dynamically add fragments rather than embedding them in XML for this scenario.

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