<xmp>UNKNOWN
//**************************************
// Name: How to create file in Andriod
// Description:How to create file in Andriod
http://androiduniquesoft.blogspot.in/
// By: Amit Kumar Gaur
//
//
// Inputs:None
//
// Returns:None
//
//Assumes:None
//
//Side Effects:None
//This code is copyrighted and has limited warranties.
//Please see http://www.Planet-Source-Code.com/xq/ASP/txtCodeId.7043/lngWId.2/qx/vb/scripts/ShowCode.htm
//for details.
//**************************************

How to create file in Andriod
http://androiduniquesoft.blogspot.in/
Here I am showing to you that how can you create a simple text file in Android.
Keep in mind that you have made the this entry of "android.permission.WRITE_EXTERNAL_STORAGE" in your AndroidManifest.xml file as listed below:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

Just use listed below code:
package com.mytest.android;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
//import com.mytest.android.MyUtil;

    public class ReadTextFromNet extends Activity {
    @Override

        public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.readtextfromnet );
        //<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
        saveToFile("aa bb cc dd ee ff");
    }
    public void saveToFile(String ss)

        { 
        File dataFile = new File("sdcard/Amittestfolder/data.txt");
        if (!dataFile.exists())

            {
            try

                {
                dataFile.createNewFile();
            }
            catch (IOException e)

                {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        try

            {
            BufferedWriter bw = new BufferedWriter(new FileWriter(dataFile, true));
            bw.append(ss);
            bw.newLine();
            bw.close();
        }
        catch (IOException e)

            {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}
		</xmp>