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        if (!VerificaConexao(this)) {
            AlertDialog alert = new AlertDialog.Builder(this).create();
            alert.setTitle("Sem Conexão");
            alert.setMessage("Sem intenert, verifique a conexão!");
            alert.setButton(AlertDialog.BUTTON_NEUTRAL, "Ok", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.dismiss();
                }
            });
            alert.setIcon(R.drawable.ic_cast_dark);
            alert.show();
            return;
        }
        
        
        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
        builder.setCancelable(true);
        builder.setTitle("Encerrar");
        builder.setMessage("Fechar a app?");
        builder.setPositiveButton("Confirmar",
                new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                      //
                    }
                });
        builder.setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
              //
            }
        });

        AlertDialog dialog = builder.create();
        dialog.show();