lista_de_alunos.setAdapter(new ArrayAdapter<String>(this,
^
constructor ArrayAdapter.ArrayAdapter(Context,int,int) is not applicable
(argument mismatch; List<Aluno> cannot be converted to int)
constructor ArrayAdapter.ArrayAdapter(Context,int,String[]) is not applicable
(argument mismatch; List<Aluno> cannot be converted to String[])
constructor ArrayAdapter.ArrayAdapter(Context,int,List<String>) is not applicable
(argument mismatch; List<Aluno> cannot be converted to List<String>)