There are file explorer style apps that will open it. Or you could download Csv Viewer app from Play Store.

Blurb from it.

CSV File Viewer For Android | CSV Reader - view small and large-sized CSV files.

CSV Reader - Simple, fast, and powerful tool for reading csv files.

I am not associated with it.

Try OpenCSV - it will make your life easier.

First, add this package to your gradle dependencies as follows

implementation 'com.opencsv:opencsv:4.6'

Then you can either do

import com.opencsv.CSVReader;
import java.io.IOException;
import java.io.FileReader;


...

try {
    CSVReader reader = new CSVReader(new FileReader("yourfile.csv"));
    String[] nextLine;
    while ((nextLine = reader.readNext()) != null) {
        // nextLine[] is an array of values from the line
        System.out.println(nextLine[0] + nextLine[1] + "etc...");
    }
} catch (IOException e) {

}

or

CSVReader reader = new CSVReader(new FileReader("yourfile.csv"));
List myEntries = reader.readAll();

Edit after comment

try {
    File csvfile = new File(Environment.getExternalStorageDirectory() + "/csvfile.csv");
    CSVReader reader = new CSVReader(new FileReader(csvfile.getAbsolutePath()));
    String[] nextLine;
    while ((nextLine = reader.readNext()) != null) {
        // nextLine[] is an array of values from the line
        System.out.println(nextLine[0] + nextLine[1] + "etc...");
    }
} catch (Exception e) {
    e.printStackTrace();
    Toast.makeText(this, "The specified file was not found", Toast.LENGTH_SHORT).show();
}

If you want to package the .csv file with the application and have it install on the internal storage when the app installs, create an assets folder in your project src/main folder (e.g., c:\myapp\app\src\main\assets\), and put the .csv file in there, then reference it like this in your activity:

String csvfileString = this.getApplicationInfo().dataDir + File.separatorChar + "csvfile.csv"
File csvfile = new File(csvfileString);

This is very helpful as far as it goes. On my iPad, I want to dictate a Notes or other text file, I would dictate things like title, author, date. I would dictate a comma between these values. I would dictate New Paragraph or New Line to create the next CSV record. So the notes/text file is in CSV format.  But is it recognizable as such? I want Excel for iOS to import this file. How do I make this file importable to Excel for iOS?  

Can I import this file directly into Excel for iOS?  Or do I need to make this file an attachment in email and open it in Outlook?  

The information you have provided so far has been valuable, letting me know that a CSV file can be imported into Excel for iOS. Now I need to tie it all together.  Can you give a step-by-step guide from beginning to end — dictate, recognize as CSV, hand off to Excel for iOS?  I want to do all these steps on my ipad. 

Thanks for any information on this!