Problems mailing multiple files via android app

Question

I made an android app and to help me with debugging I put in a little program that would write session logs in a file and then store that file in the sdcard. I wanted to go one step further with this and implement backup and deletion of the files so created. I implemented the deletion part but I can't seem to figure out how to email these files to myself. I have looked at other similar questions here and this is the code that I have right now,

    private void BackupAndClearDirectory(){
    File f = new File(Environment.getExternalStorageDirectory()+"/Music/");
    if(f.isDirectory() && f.exists()) Log.i("MyActivity", f.getAbsolutePath()+" exists");
    File [] files = f.listFiles();
    if(files == null){
        Log.i("MyActivity",f.getAbsolutePath()+" doesn't contain files");
        return;
    }
   // else Log.i("MyActivity","Directory doesn't exist");
    final int MAXFILEAGE = 7200000; //Max file age is 2 hrs

    Intent emailIntent = new Intent(Intent.ACTION_SEND_MULTIPLE);
    emailIntent.setData(Uri.parse("mailto:"));
    emailIntent.setType("text/plain");
    emailIntent.putExtra(Intent.EXTRA_SUBJECT, "Test Mail");

    String[] fileList;
    fileList = new String[1000];
    fileList = f.list();
    if(fileList == null || fileList.length == 0) Log.i("MyActivity","Empty filelist");
      /*for(File fl : files){
        long lastModified = fl.lastModified();
        if(lastModified + MAXFILEAGE<System.currentTimeMillis())
        {
            fileList.add(Environment.getExternalStorageDirectory()+"/Download/"+fl.getName());
            //Log.i("MyActivity","Deleting file "+fl);
            //files[i].delete();
        }
    }*/

   // fileList.add(files[0].toString());
   // fileList.add(files[1].toString());

    Log.i("MyActivity","List of files created");

    ArrayList<Uri> uris = new ArrayList<Uri>();
   //convert from paths to Android friendly Parcelable Uri's

    for (int i=0;i<fileList.length;i++)
    {
        File fileIn = new File(fileList[i]);
        Uri u = Uri.fromFile(fileIn);
        uris.add(u);
    }

    Log.i("MyActivity","List of uris created");

    emailIntent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris);
    con.startActivity(emailIntent);
 }

Everytime i try to run this, my app crashes and I get a NullPointerException. Can anyone tell me what I am doing wrong. Any help would be much appreciated.

Logcat output:

11-14 16:21:49.823 19014-19014/com.example.abhishek.deletiontesterapp I/MyActivity﹕ /storage/emulated/0/Music exists

11-14 16:21:49.823 19014-19014/com.example.abhishek.deletiontesterapp I/MyActivity﹕ /storage/emulated/0/Music doesn't contain files

It works when I hardcode the path to files, here's the code with hardcoded paths:

    private void BackupAndClearDirectory(){
    File f = new File(Environment.getExternalStorageDirectory()+"/Music/");
    /*if(f.isDirectory() && f.exists()) Log.i("MyActivity", f.getAbsolutePath()+" exists");
    File [] files = f.listFiles();
    if(files == null){
        Log.i("MyActivity",f.getAbsolutePath()+" doesn't contain files");
        return;
    }
   // else Log.i("MyActivity","Directory doesn't exist");
    final int MAXFILEAGE = 7200000; //Max file age is 2 hrs
   */
    Intent emailIntent = new Intent(Intent.ACTION_SEND_MULTIPLE);
    emailIntent.setData(Uri.parse("mailto:"));
    emailIntent.setType("text/plain");
    emailIntent.putExtra(Intent.EXTRA_SUBJECT, "Test Mail");

    ArrayList<String> fileList = new ArrayList<String>();
    //if(fileList == null || fileList.length == 0) Log.i("MyActivity","Empty filelist");
      /*for(File fl : files){
        long lastModified = fl.lastModified();
        if(lastModified + MAXFILEAGE<System.currentTimeMillis())
        {
            fileList.add(Environment.getExternalStorageDirectory()+"/Download/"+fl.getName());
            //Log.i("MyActivity","Deleting file "+fl);
            //files[i].delete();
        }
    }*/

   fileList.add(Environment.getExternalStorageDirectory()+"/Music/1.txt");
   fileList.add(Environment.getExternalStorageDirectory()+"/Music/2.txt");
   // fileList.add(files[1].toString());

    Log.i("MyActivity","List of files created");

    ArrayList<Uri> uris = new ArrayList<Uri>();
    //convert from paths to Android friendly Parcelable Uri's

    for (int i=0;i<fileList.size();i++)
    {
        File fileIn = new File(fileList.get(i));
        Uri u = Uri.fromFile(fileIn);
        uris.add(u);
    }

    Log.i("MyActivity","List of uris created");

    emailIntent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris);
    con.startActivity(emailIntent);
 }