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I'm looking for help with the following

Task: To open screen with exchange parameters:

screen example

To save parameters such as names of cities, date and flight class as strings. Click on search exchange button and compare data on screen with results if it's equal to saved parameters, then select a result and then compare data on summary screen.
So i need to pass data from first screen through two others.

What did i tried:
I had created ArrayList inside class which described exchange screen:

public class ExchangeRoutePageObject extends MainPageObject 
public ExchangeRoutePageObject(AppiumDriver driver)super(driver);

public ArrayList<String> saveParameters()
ArrayList<String> exchangeParameters = new ArrayList<>();
exchangeParameters.add(getElementValue(CITY_ORIGIN_FIELD_TEXT));
exchangeParameters.add(getElementValue(CITY_DESTINATION_FIELD_TEXT));
exchangeParameters.add(getElementValue(DATE_FIELD));
exchangeParameters.add(getCurrentClass());
 return exchangeParameters;
 

I'll skip code with button click scenario.

So, when i get results screen, I tried to get value from ArrayList but i get the test fail caused xpath from exchange screen (ExchangeRoutePageObject class) are not present on exchange results screen (ExchangeResultsPageObject class)

public class ExchangeResultsPageObject extends MainPageObject {
 ExchangeResultsPageObject(AppiumDriver driver)super(driver);

private void checkClass(){
 ExchangeRoutePageObject ExchangeRoutePageObject = new ExchangeRoutePageObject(driver);
 ArrayList exchangeParameters = ExchangeRoutePageObject.saveParameters();
 System.out.println(exchangeParameters.get(3));

Question What do i need to do? I saw that intent with activities are used for this case, but i don't understand how to use it with appium test.

Several months ago I used this type of approach to pass parameter between multiple activities

SharedPreferences themeInfo = getSharedPreferences("THEMECONFIG",0);

Try to take a look at this answer on stack. This SITE might help