If you want to share / send data from your application using others applications, you must use ACTION_SEND intent.
An example below :

  1. Intent intent = new Intent(Intent.ACTION_SEND);
  2.  
  3.         intent.putExtra(Intent.EXTRA_SUBJECT, this.getResources().getString(R.string.shareSubject));
  4.         intent.putExtra(Intent.EXTRA_TEXT, this.getResources().getString(R.string.shareExtra));
  5.         intent.setType("text/plain");
  6.  
  7.         startActivity(Intent.createChooser(intent, this.getResources().getString(R.string.mailAppChoose)));

If you want to choose only from e-mail applications use :

  1. intent.setType("application/e-mail");

If you want to attach a file to e-mail use :

  1. intent.putExtra(Intent.EXTRA_STREAM, Uri.parse("file://"+Environment.getExternalStorageDirectory()+"/"+fileName));