Why Aren\'t My Fragments Replacing Each Other in My Android Activity Group?

Replacing Fragments within Activity Groups

Replacing fragments within an activity group can be a complex task if you are not familiar with the Android fragmentation framework.

The Problem

When attempting to replace a fragment inside an activity group with another fragment, you may encounter a situation where the code appears to execute successfully, but no visual changes occur. This can be perplexing, as no exception messages are displayed.

The Solution

The issue arises from the fact that fragments hard coded in XML cannot be replaced. Instead, fragments should be added dynamically to allow for replacement.

To dynamically add and replace fragments:

1. Create a layout or container (e.g., fragment_container) in the activity that will hold the fragments.
2. Create a new fragment instance.
3. Create a FragmentTransaction using getSupportFragmentManager().
4. Use transaction.replace() to replace the current fragment in the fragment_container with the new fragment.
5. Add the transaction to the back stack using transaction.addToBackStack(null) if desired.
6. Commit the transaction using transaction.commit().

Example Code

Fragment newFragment = new ExampleFragment();
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.fragment_container, newFragment);
transaction.addToBackStack(null);
transaction.commit();

Note:

• Fragments that are added via the xml layout cannot be replaced.
• The R.id.fragment_container can be any suitable layout or container in the activity.

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