MaterialEditText | EditText in Material Design | Android library

I need to update an app that hasn't been updated since 2018.

I haven't messed with Android for a while, and even after updating all the libraries used, I can't find where the error is. I don't even know how many questions I've read here, and none of them have worked so far. So I decided to open my own question.

Here is the project build.gradle:

I trying to practice on tutorial that uses Firebase Authentication, Realtime Database, and Storage, I have come a very long way in this exercise until this problem, I successfully stores the emails and passwords on authentication and it shows on firebase console but the problem is with database, it's supposed to store the following HashMap on it, but nothing showing up on firebase Realtime console

The rules

My app is freezing on calling clear onTextChanged TextWatcher

Following is my code

I am getting error in implementing SpotsDialog. My whole code is appearing correct but "SpotsDialog" shows in red and the error is: package SpotsDialog does not exist I am facing problem whenever I run the app.

I had also given implementation 'com.github.d-max:spots-dialog:1.1@arr' under dependencies but dont know its imported or not properly

I have developed an android native app with a backend in MYSQL. While Had a proper internet connection I got an issue which is when I was trying to log-in to the app I got an error toast as "Volley connection Error: Unable to resolve host of my hosting server in the phones which are in above API 27 version. But It works without the mentioned issue up to API 27 version android phones. Why I got this issue??

I opened an old Android project and I fixed most of the errors and right now I have just one which appears only on Android 10 devices:

There is no compiler error. I am getting this error in runtime.

Having a slight problem with some logic that I am trying to implement to test whether a String variable has been modified or not. So in EditProfileActivity the user has the option of changing their name,username, and bio. Only thing is that when they enter the EditProfileActivity, if the username was Not changed, then when the user clicks on the checkmark to save changes it checks to see if the username already exists in the database. If so, a Toast message comes up indicating that that username already exist, and for you to pick another one.

The problem is that if the user doesn't change anything, and clicks the checkmark the Toast message pops up anyways, because that username that the user didn't change exists in the database obviously.

How can I change the code or implement logic so that even if the user clicks in the checkmark, and if the username wasn't changed the Toast message doesn't pop up and just the Activity finish();?

I tried implementing another condition in the updateProfile(); method to the if statement to check whether the original username was the same as the final username, but didn't work... I'm pretty sure that's where the I have to add another condition to check whether or not it's the same username. This is the logic that I added, but didn't work:

&& !mUsername.getText().toString().toLowerCase().equals(mUsername1.toLowerCase()).

EditProfileActivity

What I am trying to do is when a user decides to edit their username I would like to run a query through the database making sure that that username which they pick hasn't been taken. For the most part, I think I have it right, I run a for loop to look through all of the usernames that have been added to the database, and if one matches it shows A Toast message.

The issue is it shows the Toast message, but still changes the username even if it's in use. I know it's simple code, but I can't figure out what I am doing wrong. Someone mind having a look? I think the issue is the mUsername, because I set it in the updateProfile(); method, but if I set the new mUserName1, well I can't because it's an EditText and not a String.

EditProfileActivity