Java tutorial
//package com.java2s; import android.os.Environment; import java.io.File; import java.io.FileWriter; import java.io.IOException; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Date; public class Main { public static void writeCSV(String phoneNo, String Message) { File root = Environment.getExternalStorageDirectory(); File csvFile = new File(root, "/adspammer/log.csv"); FileWriter writer = null; try { writer = new FileWriter(csvFile, true); DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd @ HH:mm:ss"); Date date = new Date(); System.out.println(dateFormat.format(date)); writer.append(dateFormat.format(date).toString()); writer.append(','); writer.append(phoneNo); writer.append(','); writer.append(Message); writer.append('\n'); writer.flush(); writer.close(); } catch (IOException e) { e.printStackTrace(); } } }