Develop Reference

How to create Reusable Android BottomSheet Presentation

I have a bunch of popup Dialogs throughout the app I'm working on. What I wanted to do is turn them all into a BottomSheet presentation. Right now, I have one class where I'm instantiating the Dialogs from and able to reuse them throughout the app.
What would I need to do: to do the same to be able to reuse BottomSheetDialogFragments? Rather than creating a BottomSheet presentation from a screen to screen basis, is there a way to have all of them in one class and just call them when I need to from a different screen?
Adding a little bit more context. Let's say I have a CloseDialog, LogoutConfirmationDialog and I use them on multiple screens currently. I would like to do the same with the Android BottomSheet presentation modal if I was to turn these two Dialogs into a BottomSheet presentation.

You can create a custom fragment and inherit "BottomSheetDialogFragment"
class CustomBtmSheetFragment : BottomSheetDialogFragment()
{
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View?
{
return inflater.inflate(
R.layout.fragment_dialog,
container,
false
)
}
override fun getTheme(): Int = R.style.CustomBottomSheetDialog
override fun onCreateDialog(savedInstanceState: Bundle?): Dialog =
BottomSheetDialog(requireContext(), theme)
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
dialog?.window?.setBackgroundDrawable(ColorDrawable(Color.TRANSPARENT))
}
}

I want to open an activity as bottom sheet dialog

I have a button, which onClicked takes to another activity. Now I want the activity to open as bottomDialog. How o do that??
if (success) {
val intent = Intent(this, PaymentActivity::class.java)
intent.putExtra("total_amount",totalAmount)
startActivity(intent)
finishAffinity()
}
I want the PaymentActivity mentioned here to be opened as bottomSheet.

change your Payment Activity to BottomSheetDialogFragment
class PaymentActivity : BottomSheetDialogFragment() {
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
return inflater.inflate(R.layout.activity_payment, container, false)
}
}
and you can call it like this,
if (success) {
val b = PaymentActivity()
b.show(supportFragmentManager, "Hi")
}
Add total amount in Bundle.

Kotlin close fragment onclick

I have a fragment that is called from the activity_main screen when a main menu drop down option is clicked. I am trying to have the fragment close and show the activity_main screen again when the cancel button is clicked. I have user input in the activity_main screen that I would like to still be there if the fragment is closed while clicking cancel but at this point i will settle for the fragment just closing and the activity_main showing back at it's original state.
I am using androidx and all of the answers I have found so far have been compatible with android.support.v7
This is the code that i have in my fragment, it does not do anything at all when I click the 'Cancel' button, the fragment just continues to sit there over the activity_main.
class SaveFragment: Fragment() {
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
val view: View = inflater.inflate(R.layout.savefragment, container, false)
return view
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
b_cancel.setOnClickListener {
fragmentManager?.popBackStack()
}
}
}
Here is the code that calls the savefragment from the MainActivity:
override fun onOptionsItemSelected(item: MenuItem): Boolean {
return when (item.itemId) {
R.id.i_save -> {
val SaveFragment = SaveFragment()
supportFragmentManager.beginTransaction().replace(R.id.activity_main_main, SaveFragment).commit()
true
}
R.id.i_recall -> {
val RecallFragment = RecallFragment()
supportFragmentManager.beginTransaction().replace(R.id.activity_main_main, RecallFragment).commit()
true
}
else -> super.onOptionsItemSelected(item)
}
}
Any help at all in Kotlin would be appreciated.

Conditional Up and Back Actions with Android Navigation Component Library

How to provide conditional Up and Back navigation when using Android's Navigation Component library?
For example, my app has a contact book. When creating a new contact, if the user presses back before filling out any info, I'd like to go back to the list of contacts. If the user filled out info, I'd like to go to the detail view of that contact.

In your fragment's onCreate, add an OnBackPressedCallback callback:
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
requireActivity().onBackPressedDispatcher.addCallback(this) {
backOrUpPressed()
}
}
Then, after you setup your toolbar with the NavController, set a NavigationOnClickListener:
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
// Setup the view
setSupportActionBar(toolbar)
toolbar.setupWithNavController(findNavController(), AppBarConfiguration(findNavController().graph))
toolbar.setNavigationOnClickListener { backOrUpPressed() }
}
Then implement your custom Up/Back logic in backorUpPressed()

Base Navigation Fragment for multiple Fragments

Is it possible to create a Navigation Fragment to contain my navigation back button click logic.
Multiple Fragment's that have a back button would then be able then inherit from the Navigation Fragment.
I'm new to Kotlin development. As you see below the SigninFragment inflates the view, I'm not sure how to get a reference to the view & back button in a parent Navigation Fragment
class SigninFragment : Fragment() {
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
val view = inflater.inflate(R.layout.fragment_signin, container, false)
// Navigation back button logic
var headerBackButton = view.findViewById<ImageButton>(R.id.headerBackButton)
headerBackButton.setOnClickListener {
val navController = NavHostFragment.findNavController(this#SignInFragment)
navController.navigateUp()
}
return view
}
}

I'm not sure if I got your problem right but could this be the trick?
open class NavigationFragment() : Fragment() {
fun asignNavigationBackClickListener(backButton: View) {
backButton.setOnClickListener {
val navController = NavHostFragment.findNavController(this#NavigationFragment)
navController.navigateUp()
}
}
}
class SigninFragment : NavigationFragment() {
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
val view = inflater.inflate(R.layout.fragment_signin, container, false)
asignNavigationBackClickListener(view.findViewById(R.id.headerBackButton))
return view
}
}

I think you can use this code for going back to the previous activity:
headerBackButton.setOnClickListener {
finish()
}