InstructionsFlavor1.java

public class InstructionsActivity extends AppCompatActivity {
  
  //Params
  protected Payment mPayment;
  protected String mMerchantPublicKey;
  protected PaymentMethod mPaymentMethod;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_instructions);
      
      mPayment = (Payment) getIntent().getExtras().getSerializable("payment");
      mMerchantPublicKey = this.getIntent().getStringExtra("merchantPublicKey");
      mPaymentMethod = (PaymentMethod) getIntent().getSerializableExtra("paymentMethod");
      
      MercadoPago mercadoPago = new MercadoPago.Builder()
              .setContext(this)
              .setPublicKey(mMerchantPublicKey)
              .build();
      getInstructionsAsync(mercadoPago);
  }

  protected void getInstructionsAsync(MercadoPago mercadoPago) {

    mercadoPago.getInstructions(mPayment.getId(), mPaymentMethod.getId(), new Callback<Instruction>() {
      @Override
      public void success(Instruction instruction, Response response) {
        // Listo, aquí ya tienes las instrucciones para
        //contarle a tu usuario cómo finalizar el pago.
        showInstructions(instruction);
      }
  
      @Override
      public void failure(RetrofitError error) {
        // Ups, ha ocurrido un error.
      }
    });
  }
}