Java tutorial
//package com.java2s; import java.io.BufferedWriter; import java.io.File; import java.io.FileWriter; import java.io.IOException; import android.content.Context; import android.util.Log; public class Main { public static void writeInteractionInFile(Context context, String startTime, String endTime, long duration, String filename) throws IOException, Exception { BufferedWriter writer = null; //String path="sdcard/LifeTracker/lifetracker.csv"; File dir = new File("sdcard/SleepLog"); boolean flag = dir.mkdir(); //Log.d("Directory created?",""+flag); File file = new File(dir.getAbsolutePath(), filename); if (file.exists() == false) { // Intent service = new Intent(context,DataBaseService.class); // context.startService(service); file.createNewFile(); writer = new BufferedWriter(new FileWriter(file, true)); writer.write("Start Time,End Time,Duration"); writer.newLine(); writer.write(startTime + "," + endTime + "," + duration); } else { writer = new BufferedWriter(new FileWriter(file, true)); writer.newLine(); writer.write(startTime + "," + endTime + "," + duration); } Log.d("Appended", "True"); writer.flush(); writer.close(); } }