SnackBar | like alert pattern for Android | Android library

I want to show snackbar with a button onclick in Jetpack Compose
I tried this

I have an Android application with Bottom Navigation Bar. In the Main Activity I have a floating button and when I press it, I would like to open a Fragment (or another activity?) that will cover the whole screen (the Bottom NavBar and other content will be below my new opened fragment). I would like to add that this newly opened fragment will be used for adding some item and when the user fills all fileds like name, weight etc. and click "add", the fragment should be closed and we should see our bottom nav bar with its' fragments.

Could you provide the solution to my problem? I would be grateful for some code enabling to do this!

Here are the most important parts of my code:

activity_main.xml:

In my application I want use RecyclerView adapter and for set data I used DiffUtils.
I Want search data from server and then show it into RecyclerView!
I write below codes, but after search data show items overlay!
I want first clear previous data, then add new items!

Fragment codes :

Below is the vehicle uploading details file code that uploads details on the firebase. It uploads city, vehicle type, and phone number. I wanted to search for vehicle in the specified city. So basically it matches the details of user. For example a person wants to book vehicle in city Lahore and vehicle type Car so this should search in database if anyone uploaded details matching the description and show it to the user.

I have this code and I am getting this error that I have been trying to solve from 3 to 4 days and I didn't find a solution hope anyone can help me to get a solution to solve this Binding error I am facing.

/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/get-4.6.1/lib/get_navigation/src/extension_navigation.dart:357:24: Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.

• 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/C:/src/flutter/packages/flutter/lib/src/scheduler/binding.dart'). SchedulerBinding.instance!.addPostFrameCallback((_) { ^ /C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/get-4.6.1/lib/get_navigation/src/extension_navigation.dart:468:24: Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.
• 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/C:/src/flutter/packages/flutter/lib/src/scheduler/binding.dart'). SchedulerBinding.instance!.addPostFrameCallback((_) { ^ /C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/get-4.6.1/lib/get_navigation/src/snackbar/snackbar.dart:452:22: Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.
• 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/C:/src/flutter/packages/flutter/lib/src/scheduler/binding.dart'). SchedulerBinding.instance!.addPostFrameCallback( ^ /C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/get-4.6.1/lib/get_state_manager/src/rx_flutter/rx_disposable.dart:20:22: Warning: Operand of null-aware operation '?.' has type 'SchedulerBinding' which excludes null.
• 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/C:/src/flutter/packages/flutter/lib/src/scheduler/binding.dart'). SchedulerBinding.instance?.addPostFrameCallback((_) => onReady()); ^ /C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/get-4.6.1/lib/get_state_manager/src/rx_flutter/rx_notifier.dart:130:22: Warning: Operand of null-aware operation '?.' has type 'SchedulerBinding' which excludes null.
• 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/C:/src/flutter/packages/flutter/lib/src/scheduler/binding.dart'). SchedulerBinding.instance?.addPostFrameCallback((_) => onReady()); ^ /C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/get-4.6.1/lib/get_state_manager/src/simple/get_controllers.dart:90:20: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
• 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/C:/src/flutter/packages/flutter/lib/src/widgets/binding.dart'). WidgetsBinding.instance!.addObserver(this); ^ /C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/get-4.6.1/lib/get_state_manager/src/simple/get_controllers.dart:96:20: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
• 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/C:/src/flutter/packages/flutter/lib/src/widgets/binding.dart'). WidgetsBinding.instance!.removeObserver(this); ^ /C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/get-4.6.1/lib/get_navigation/src/router_report.dart:53:22: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
• 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/C:/src/flutter/packages/flutter/lib/src/widgets/binding.dart'). WidgetsBinding.instance!.addPostFrameCallback((_) { ^ This app is linked to the debug service: ws://127.0.0.1:53736/oionbuT1rro=/ws Debug service listening on ws://127.0.0.1:53736/oionbuT1rro=/ws

Running with sound null safety Debug service listening on ws://127.0.0.1:53736/oionbuT1rro=/ws Error: Assertion failed: file:///C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_core_web-1.5.4/lib/src/firebase_core_web.dart:273:11 options != null "FirebaseOptions cannot be null when creating the default app." at Object.throw_ [as throw] (http://localhost:53548/dart_sdk.js:5066:11) at Object.assertFailed (http://localhost:53548/dart_sdk.js:4991:15) at firebase_core_web.FirebaseCoreWeb.new.initializeApp (http://localhost:53548/packages/firebase_core_web/firebase_core_web.dart.lib.js:252:42) at initializeApp.next () at http://localhost:53548/dart_sdk.js:40547:33 at _RootZone.runUnary (http://localhost:53548/dart_sdk.js:40417:59) at _FutureListener.thenAwait.handleValue (http://localhost:53548/dart_sdk.js:35361:29) at handleValueCallback (http://localhost:53548/dart_sdk.js:35907:49) at Function._propagateToListeners (http://localhost:53548/dart_sdk.js:35945:17) at _Future.new.[_completeWithValue] (http://localhost:53548/dart_sdk.js:35793:23) at async._AsyncCallbackEntry.new.callback (http://localhost:53548/dart_sdk.js:35814:35) at Object._microtaskLoop (http://localhost:53548/dart_sdk.js:40684:13) at _startMicrotaskLoop (http://localhost:53548/dart_sdk.js:40690:13) at http://localhost:53548/dart_sdk.js:36167:9

I've implemented a Dialog component which displays the values of some state variables.

When the Dialog closes, the state variables are reset to default. The problem is that although the Dialog closes in less than a second, it's still enough time to see that the text has changed.

Is there a way to stop the text from changing until the Dialog has actually closed? I tried setting the dialogOpen state variable to false first, before resetting the other state variables to default, but it didn't help since it happens too fast and React asynchronously batches the state changes anyway.

I am calling an API to do few actions.
I want to take the response of each action and show it inside Snackbar/alert.

I am able to show only the first response and nothing else even after iterating the messages in a map.

Here is my business logic calling the api

I got this error when I clicked my login button, I was expecting the validator would work but I just got this error every time I clicked my login button

I have an application that's supposed to open a popup dialog when the user clicks on the item but crashes when clicked. It started crashing as I added the (this as AppCompatActivity).supportFragmentManager line. Heres the code for the adapter pls help!!