How to solve the transfer of logic from activity to fragments?

Question

Android

The meaning of the problem is the following, how can I transfer the logic from activity to fragmtnts? When transferring Android studia swears at my shit code, help me solve the problem.
Activity code:

package com.example.user.dbv2;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.GenericTypeIndicator;
import com.google.firebase.database.ValueEventListener;

import java.util.List;

public class Content_mainActivity extends AppCompatActivity {

    private FirebaseAuth mAuth;
    private DatabaseReference myRef;

    private List<String> drive;
    private List<String> drive2;
    private List<String> teor;
    private List<String> teor2;


    ListView ListUserDrive;
    ListView ListUserDrive2;
    ListView ListUserTeor;
    ListView ListUserTeor2;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_content_main);


        ListUserDrive = (ListView) findViewById(R.id.discr_for_tasks);
        ListUserDrive2 = (ListView) findViewById(R.id.discr_for_tasks_test);
        ListUserTeor = (ListView) findViewById(R.id.teor);
        ListUserTeor2 = (ListView) findViewById(R.id.teor2);

        myRef = FirebaseDatabase.getInstance().getReference();

        FirebaseUser user = mAuth.getInstance().getCurrentUser();

        myRef.child(user.getUid()).addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {

                GenericTypeIndicator<List<String>> t = new GenericTypeIndicator<List<String>>() {};
                GenericTypeIndicator<List<String>> t2 = new GenericTypeIndicator<List<String>>() {};
                GenericTypeIndicator<List<String>> t3 = new GenericTypeIndicator<List<String>>() {};
                GenericTypeIndicator<List<String>> t4 = new GenericTypeIndicator<List<String>>() {};
                drive = dataSnapshot.child("Вождение").getValue(t);
                drive2 = dataSnapshot.child("Вождение_Когда").getValue(t2);
                teor = dataSnapshot.child("Теория").getValue(t3);
                teor2 = dataSnapshot.child("Теория_Когда").getValue(t4);

                updateUI();
                updateUI2();
                updateUI3();
                updateUI4();


            }

            @Override
            public void onCancelled(DatabaseError databaseError) {

            }
        });


    }
    private void updateUI() {
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(getBaseContext(), android.R.layout.simple_list_item_1, drive);
        ListUserDrive.setAdapter(adapter);

    }

    private void updateUI2() {
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(getBaseContext(), android.R.layout.simple_list_item_1, drive2);
        ListUserDrive2.setAdapter(adapter);

    }

    private void updateUI3() {
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(getBaseContext(), android.R.layout.simple_list_item_1, teor);
        ListUserTeor.setAdapter(adapter);

    }

    private void updateUI4() {
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(getBaseContext(), android.R.layout.simple_list_item_1, teor2);
        ListUserTeor2.setAdapter(adapter);

    }
    
}

Answer 1

1. You read how fragments and activities differ, their life cycles
2. You transfer