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AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setCancelable(true);
builder.setTitle("Tripular");
builder.setMessage("Está tripulado com outra operadora?");
builder.setPositiveButton("Confirmar",
        new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Disponivel = 5;
                mLocationRequest.setInterval(20000);
                mp = MediaPlayer.create(MainActivity.this, R.raw.ub__offline);
                mp.start();
                changeButtonsState(Disponivel);
            }
        });
        builder.setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
            }
        });

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