Encoding ZXing with Intent

Android : http://stackoverflow.com/questions/2489048/qr-code-encoding-and-decoding-using-zxing

(for iOS) http://dev4mac.blogspot.co.uk/2011/10/qr-using-zxing-zebra-crossing.html

My code: package com.thetmonaye.ucl;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.Button;
import android.widget.EditText;
import android.view.View;


public class EncoderActivity extends Activity {


@Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.encoder);
   
     
       //Pointers to Text fields
final EditText receive_amount = (EditText) findViewById(R.id.receive_amount);
final EditText emailAddressField = (EditText) findViewById(R.id.emailAddress);
final EditText memoField = (EditText) findViewById(R.id.memo);
final EditText barcodeField = (EditText) findViewById(R.id.barcode);


Button qrButton = (Button) this.findViewById(R.id.create_QR_button);
qrButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {

// getting the values from the EditText Fields
String amount = receive_amount.getText().toString();
String email = emailAddressField.getText().toString();
String memo = memoField.getText().toString();
String barcode = barcodeField.getText().toString();

if (amount != null && email != null && memo != null && barcode != null)
{
// URI to be encoded as a QR code
String uri = "thetUcl:"+"amount="+amount+"&"+"email="+email+"&"+"memo="+memo+"&"+"barcode="+barcode;

generateQRCode(uri);

}
}
});    
}


private void generateQRCode(String data) {
// call it simply by Intent and you don't need to add library or any codes
Intent intent = new Intent("com.google.zxing.client.android.ENCODE");
intent.putExtra("ENCODE_TYPE", "TEXT_TYPE");
intent.putExtra("ENCODE_DATA", data);
intent.putExtra("ENCODE_FORMAT", "QR_CODE");
startActivity(intent);
}

}