Executar o evento de passar o dedo da direita para a esquerda no click do botão (Swipe) Android

public class MyFragment extends Fragment {

    private Context context;
    private LayoutInflater layoutInflater;
    private ImageView proximo;
    private ImageView anterior;
    private static Promocao[] promocoes;
    private MainActivity mainActivity;

    public static Fragment newInstance(MainActivity context, int pos, float scale, Promocao[] promocaoParametro) {
        Bundle b = new Bundle();
        b.putInt("pos", pos);
        b.putFloat("scale", scale);
        promocoes=promocaoParametro;

        Log.i(TAG, "[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[");
        Log.i(TAG, "newInstance: pos ---> "+pos);
        Log.i(TAG, "newInstance: scale ---> "+scale);
        Log.i(TAG, "[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[");

        return Fragment.instantiate(context, MyFragment.class.getName(), b);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        if (container == null) {
            return null;
        }



        LinearLayout view = (LinearLayout)
                inflater.inflate(R.layout.mf, container, false);


        String valordesconto = "";
        SpannableStringBuilder valorDeTextoEditado;


        TextView titulo             = (TextView)  view.findViewById(R.id.titulo);
        TextView informacao         = (TextView)  view.findViewById(R.id.informacao);
        TextView bairro             = (TextView)  view.findViewById(R.id.bairro);
        TextView valorDe            = (TextView)  view.findViewById(R.id.valorDe);
        TextView valorPara          = (TextView)  view.findViewById(R.id.valorPara);
        TextView resumoOferta       = (TextView)  view.findViewById(R.id.resumoOferta);
        ImageView imageCliente      = (ImageView) view.findViewById(R.id.imageCliente);
        ImageView imagemPromocao    = (ImageView) view.findViewById(R.id.imagemPromocao);
        LinearLayout fundoLayout    = (LinearLayout) view.findViewById(R.id.fundoLayout);

        final int position = this.getArguments().getInt("pos");

        if(this.promocoes[position].vlreal > 0){

            String textoDe ="R$ ";
            String valorDeTexto = String.format("%.2f",this.promocoes[position].vlreal);
            StrikethroughSpan strikethroughSpan = new StrikethroughSpan();
            SpannableStringBuilder ssb = new SpannableStringBuilder(textoDe);

            ssb.append(valorDeTexto);

            ssb.setSpan(
                    strikethroughSpan,
                    ssb.length() - valorDeTexto.length(),
                    ssb.length(),
                    Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

            valorDeTextoEditado = ssb;

            double valorcalc = this.promocoes[position].vlreal - (this.promocoes[position].vlreal * this.promocoes[position].desconto / 100);
            valordesconto = "R$ "+String.format("%.2f",valorcalc);



        }else{

            valorDeTextoEditado = SpannableStringBuilder.valueOf("");
            valordesconto = String.valueOf(this.promocoes[position].desconto) + "%";

            valorDe.setVisibility(View.INVISIBLE);
            valorPara.setTextSize(200);

            ViewGroup.LayoutParams params = (ViewGroup.LayoutParams) valorPara.getLayoutParams();
            ViewGroup.LayoutParams paramsde = (ViewGroup.LayoutParams) valorDe.getLayoutParams();


            params.height = 250;
            valorPara.setLayoutParams(params);

            paramsde.height = 1;
            valorDe.setLayoutParams(paramsde);

        }

        BitmapDrawable background = new BitmapDrawable(this.promocoes[position].imagemByte);
        fundoLayout.setBackgroundDrawable(background);
        fundoLayout.getBackground().setAlpha(32);

        titulo.setText(this.promocoes[position].titulo);
        informacao.setText(this.promocoes[position].informacao);
        bairro.setText(this.promocoes[position].bairro);
        valorDe.setText(valorDeTextoEditado, TextView.BufferType.EDITABLE);
        valorPara.setText(valordesconto);
        resumoOferta.setText(this.promocoes[position].resumooferta);
        imageCliente.setImageBitmap(this.promocoes[position].logoByte);
        imagemPromocao.setImageBitmap(this.promocoes[position].imagemByte);


        Button b = (Button) view.findViewById(R.id.btnComprar);
        proximo  = (ImageView) view.findViewById(R.id.btn_proximo);
        anterior = (ImageView) view.findViewById(R.id.btn_voltar);


        final ViewPager viewPager = (ViewPager)getActivity().findViewById(R.id.myviewpager);
        mainActivity = new MainActivity();

        b.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                ArrayList<String> ar = new ArrayList<String>();

                ar.add(String.valueOf(promocoes[position].idpromocao));


                Intent telefone = new Intent(v.getContext(),Telefone.class );
                telefone.putStringArrayListExtra("list",ar);
                v.getContext().startActivity(telefone);
                //Log.i(txtTitulo, txtTitulo);

            }
        });

        proximo.setOnClickListener(new View.OnClickListener(){
            public void onClick(View v ){
                ----- Aqui da direta para a esquerda 
            }

        });

        anterior.setOnClickListener(new View.OnClickListener(){
            public void onClick(View v ){
                ----- Aqui da esquerda para a direta 

            }

        });




        MyLinearLayout root = (MyLinearLayout) view.findViewById(R.id.root);
        float scale = this.getArguments().getFloat("scale");
        root.setScaleBoth(scale);

        return view;
    }

}