Android 9 Development Cookbook - Third Edition

How it works...

Most of the steps for this recipe involve setting up the Fragments. Once the Fragments are declared, we create them in the onCreate() method. Though the code can be condensed to a single line, it's shown in the long form as it makes it easier to read and understand.

First, we get FragmentManager so we can begin FragmentTransaction. Once we have FragmentTransaction, we start the transaction with beginTransaction(). Multiple actions can occur within the transaction, but all we need here is to add() our initial Fragment. We call the commit() method to finalize the transaction.

Now that you understand the Fragment transaction, here is the succinct version for onCreate():

getSupportFragmentManager().beginTransaction().add(R.id. ...