private Os mInstance = null;
private int numeroOs, updateServer;
Context context;

    public synchronized Os getInstance(Context c,  int numeroOs) {
        context = c;
        if (mInstance == null) {
            mInstance = new Os(context.getApplicationContext(), numeroOs);
        }

        return mInstance;
    }

    protected Os(Context context, int numeroOs) {
        this.numeroOs = numeroOs;
        this.context = context;
    }