MainActivity.java

package com.learnoset.testproject;

import android.app.DownloadManager;
import android.content.Context;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

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

        // Downloading file from URL using DownloadManager
        downloadFile("Your file Url here");
    }

    private void downloadFile(String fileUrl) {

        DownloadManager.Request request = new DownloadManager.Request(Uri.parse(fileUrl));

        // set meta details to the file
        request.setTitle("Title for the file");
        request.setDescription("Description for the file");

        // If you are download big file that takes time then you can pass true in this function so device won't be shut down while file is downloading.
        request.setRequiresCharging(true);

        // set filename
        request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "your_file_name.png");

        // set notification VISIBILITY
        request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE);

        DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);

        // put file to the download queue
        final long downloadId = manager.enqueue(request);
    }
}