CODEWITHSUNDEEP
javaandroidcsv
Ben Newton
Ben Newton

Reputation: 7

Pulling values from an CSV file in java

I am having some trouble pulling values from a CSV file for android app that I am working on. The CSV file takes the following format:

Acton Town (District),Acton Town (Piccadilly),2.00
Aldgate (Circle),Aldgate (Metropolitan),4.00
Aldgate East (District),Aldgate East (Hammersmith And City),2.00

I am trying to import it into my java class using the following method:

public ArrayList<Connection> importConnections(){
        try 
        {
            //gets the lines.txt file from assets
            in = this.getAssets().open("connections.csv");
            Scanner scan = new Scanner(in);
            TextView lineData = (TextView)findViewById(R.id.displayLine);
            String connection = null;
            String startingStation = null;
            String endingStation = null;
            Float duration = 0;
            do
            {
                connection = scan.nextLine();
                String delimiter = ",\n";
                StringTokenizer tokens = new StringTokenizer(connection, delimiter);
                startingStation = tokens.nextToken();
                endingStation = tokens.nextToken();
                duration = Float.parseFloat(tokens.nextToken());
                connections.add(startStation, endStation, duration);
            }
            while(scan.hasNext());
            //for testing purposes
            lineData.setText(endingStation);
        } 
        catch (IOException e) 
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return connections;
    }

If I run this, the app will crash and I can't figure out why. If I set lineData.setText(endingStation) as lineData.setText(connection), it will display the entire row e.g:

Acton Town (District),Acton Town (Piccadilly),2.00

If I comment out the

duration = Float.parseFloat(tokens.nextToken());

it will run the method. Can anyone find any fault with this method?

Upvotes: 0

Views: 298

Answers (1)

Chris K
Chris K

Reputation: 1629

You could try using OpenCSV http://opencsv.sourceforge.net/

It is pretty simple to use and returns an array of each row.

CSVReader reader = new CSVReader(new FileReader(<filepath>));

String[] temp;
int NUM = #; //number of rows in csv, or insert code to read through file until null.

for(int i = 0; i < NUM; i++)
{               
    temp = reader.readNext();               //read next line into temp
}

System.out.println(temp[0]); //Acton Town (District)
System.out.println(temp[1]); //Acton Town (Piccadilly)
System.out.println(temp[2]); //2.00 (string)


reader.close();

Like I said, it is easy to use and prevents you from having to parse out the string on your own.

Upvotes: 3

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