androidApp/app/src/main/java/com/localtransfer/fragment/ProgressFragment.java

package com.localtransfer.fragment;

import android.os.Bundle;

import androidx.fragment.app.Fragment;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.localtransfer.R;
import com.localtransfer.Transfer;

import java.util.List;

public class ProgressFragment extends Fragment {

    public ProgressFragment() {
        // Required empty public constructor
    }

    public static ProgressFragment newInstance() {
        ProgressFragment fragment = new ProgressFragment();
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        Transfer.fragment_progress = inflater.inflate(R.layout.fragment_progress, container, false);

        return Transfer.fragment_progress;
    }

    @Override
    public void onResume(){
        super.onResume();

        Transfer.fragment_on = true;

        List<Transfer> instances = Transfer.getInstances();
        for (Transfer file: instances) {
            file.showProgressFragment();
        }
    }

    @Override
    public void onPause(){
        super.onPause();

        Transfer.fragment_on = false;
    }
}