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//Acceder y crear valor x defecto 
SharedPreferences prefe=getSharedPreferences("datos", Context.MODE_PRIVATE);
et.setText(prefe.getString("mail","sin_mail"));



SharedPreferences preferncias=getSharedPreferences("datos", Context.MODE_PRIVATE);
SharedPreferences.Editor editor=preferncias.edit();
//guardar dato 
editor.putString("mail",et.getText().toString());
//guardar cambio
editor.commit();