In this video it shows how one can open phone’s Download folder from your App. It uses the intent and Download Manager to access the Download folder.

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Complete source code and other details:

package com.programmerworld.opendownloadfolderapp;

import androidx.appcompat.app.AppCompatActivity;

import android.app.DownloadManager;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends AppCompatActivity {

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

    public void buttonOpenDownload(View view){
        Intent intent = new Intent(DownloadManager.ACTION_VIEW_DOWNLOADS);
        startActivity(intent);
    }
}

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="112dp"
        android:layout_marginTop="130dp"
        android:onClick="buttonOpenDownload"
        android:text="Open Download"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

No changes required in Manifest, gradle or any other file.