What navigation methods are available in the application besides using the navigation library?

Explicit Intents: Transition between activities using startActivity().

// Creating an intent to transition to NewActivity
val intent = Intent(this, NewActivity::class.java)
// Adding data to the intent
intent.putExtra("data_key", "some value")
// Starting the new activity
startActivity(intent)

Implicit Intents: Launch activities from other applications or parts of the system.

// Creating an intent to open a web page
val webpage: Uri = Uri.parse("http://www.android.com")
val webIntent = Intent(Intent.ACTION_VIEW, webpage)
// Starting an activity that can handle this intent
startActivity(webIntent)

DialogFragment: Using dialog windows to display information or get user input, which can lead to further actions or close.

// Creating an instance of a dialog fragment
val myDialogFragment = MyDialogFragment()
// Showing the dialog
myDialogFragment.show(supportFragmentManager, "my_dialog")

FragmentTransaction: Manual management of fragments within an activity: adding, replacing, removing.

// Getting FragmentManager
val fragmentManager = supportFragmentManager
// Beginning a transaction
val fragmentTransaction = fragmentManager.beginTransaction()
// Replacing the current fragment with a new one
fragmentTransaction.replace(R.id.fragment_container, newFragment)
// Adding the transaction to the back stack
fragmentTransaction.addToBackStack(null)
// Committing the transaction
fragmentTransaction.commit()

Single-activity architecture with manual fragment management: All navigation is implemented within a single activity by switching displayed fragments. Essentially, a more structured use of FragmentTransaction.

Custom Views: Building complex and non-template navigation using custom Views that switch or change content depending on the application's state.