Htykuut

I have a text file containing userPhone and the relevant foodId for recommendation purposes in a menu app.
I have successfully read the relevant foodId based on each userPhone login. How am I able to get the foodId from the text file and retrieve from firebase to display in recycler view? foodId are stored in firebase.
(different user login will display the relevant foodId based on each phone number). I am just a beginner. Thanks in advance

.txt file

0122233444=47

0125547890=48

9876543210=54,29,49

Recommendation.java

@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_recommendation);



    TextView recList = (TextView)findViewById(R.id.rec_list);



    //Firebase

    database = FirebaseDatabase.getInstance();



    String userPhone = Common.currentUser.getPhone();

    String recommend = findRecommendation(userPhone);



    if (recommend != null) {

        recList.setText(recommend);

    } else {

        recList.setText("Not enough transaction");

    }

}



private String findRecommendation(String userPhone) {



    //open raw resource and connect to input stream variable

    InputStream input = getResources().openRawResource(R.raw.foodrecommendation);



    //scanner

    Scanner scan = new Scanner(input);



    while (scan.hasNext()) {

        String line = scan.nextLine(); //phoneNo + foodId

        String  pieces = line.split("=");

        if (pieces[0].equalsIgnoreCase(userPhone.trim())) {

            return pieces[1];

        }

    }



    return null;

}

Firebase structure

foodId

user phone number