SEND MAIL

Intent sendIntent = new Intent(Intent.ACTION_SEND);
// Add attributes to the intent
sendIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
sendIntent.putExtra(Intent.EXTRA_SUBJECT,"subject line");
sendIntent.putExtra(Intent.EXTRA_TEXT,"Body of email");
sendIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(new File("Filename")));
sendIntent.setType("vnd.android.cursor.dir/email");

startActivity(Intent.createChooser(sendIntent,"Email:"));