bip

package com.example.puntobip;



import java.io.IOException;

import java.util.Random;



import android.app.Activity;

import android.app.AlertDialog;

import android.app.PendingIntent;

import android.content.Intent;

import android.content.IntentFilter;

importandroid.content.IntentFilter.MalformedMimeTypeException;

import android.nfc.NfcAdapter;

import android.nfc.Tag;

import android.nfc.tech.MifareClassic;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.widget.TextView;

import android.widget.Toast;



public class MainActivity extends Activity {

        private final int DIALOG_SALDO = 1;

        private final int DIALOG_CARGAR = 2;

        private final int DIALOG_NUMERO = 3;

        private final byte[] KEY_B_SECTOR_0= new byte[]{(byte)0x1F,(byte)0xC2,(byte)0x35,(byte)0xAC,(byte)0x13,(byte)0x09};

        private final byte[] KEY_B_SECTOR_8= new byte[]{(byte)0x64,(byte)0xE3,(byte)0xC1,(byte)0x03,(byte)0x94,(byte)0xC2};

        private final byte[] DATA_CARGA_B21= new byte[]{(byte)0x10,(byte)0x27,(byte)0x00,(byte)0x00,(byte)0xef,(byte)0xd8,(byte)0xff,(byte)0xff,(byte)0x10,(byte)0x27,(byte)0x00,(byte)0x00,(byte)0x21,(byte)0xde,(byte)0x21,(byte)0xde};

        private final byte[] DATA_CARGA_B22= new byte[]{(byte)0x10,(byte)0x27,(byte)0x00,(byte)0x00,(byte)0xef,(byte)0xd8,(byte)0xff,(byte)0xff,(byte)0x10,(byte)0x27,(byte)0x00,(byte)0x00,(byte)0x22,(byte)0xdd,(byte)0x22,(byte)0xdd};



        private TapDialog tapDialog;



        private NfcAdapter mNfcAdapter;

    private PendingIntent mPendingIntent;

    private IntentFilter[] mFilters;

    private String[][] mTechList;





        @Override

        protected void onCreate(Bundle savedInstanceState) {

               super.onCreate(savedInstanceState);

                setContentView(R.layout.activity_main);

                showTapDialog(getResources().getString(R.string.consultar_saldo), DIALOG_SALDO);

                inicializarNFC();

        }



        public void onCargarSaldo(View view){

                showTapDialog(getResources().getString(R.string.cargar_saldo), DIALOG_CARGAR);

        }



        public void onCambiarNumero(Viewview) {

                showTapDialog(getResources().getString(R.string.cambiar_numero), DIALOG_NUMERO);

        }



        private void showTapDialog(Stringmessage, int tag) {

                if(tapDialog == null) {

                        tapDialog = newTapDialog(this);

                        tapDialog.setCanceledOnTouchOutside(false);

                }

                tapDialog.setTitle(message);

                tapDialog.setTag(tag);

                tapDialog.show();

        }



        private void inicializarNFC() {

                mNfcAdapter =NfcAdapter.getDefaultAdapter(this);

        if (mNfcAdapter == null) {

            Toast.makeText(this, "Este dispositivo no soporta NFC.", Toast.LENGTH_LONG).show();

            finish();

            return;

        }



        if (!mNfcAdapter.isEnabled()) {

                AlertDialog alertDialog =new AlertDialog.Builder(this).create();

                alertDialog.setTitle("NFC deshabilitado");

                alertDialog.setMessage("Su NFC está deshabilitado.\nIngrese a las opciones de configuración y activelo.");

                alertDialog.show();

        }



        mPendingIntent =PendingIntent.getActivity(this, 0,

                new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP),0);



        IntentFilter ndef = newIntentFilter(NfcAdapter.ACTION_TECH_DISCOVERED);

        try {

            ndef.addDataType("*/*");

        } catch (MalformedMimeTypeException e) {

            throw newRuntimeException("error", e);

        }



        mFilters = new IntentFilter[]{ndef};

        mTechList = new String[][] { newString[] { MifareClassic.class.getName() }};

        }



        @Override

    protected void onResume() {

        super.onResume();



        mNfcAdapter.enableForegroundDispatch(this, mPendingIntent, mFilters, mTechList);

    }



    @Override

    protected void onPause() {

        super.onPause();



        mNfcAdapter.disableForegroundDispatch(this);

    }



    @Override

    protected void onNewIntent(Intent intent) {

        String action = intent.getAction();



                if(NfcAdapter.ACTION_TECH_DISCOVERED.equals(action)){

                        Tag tagFromIntent =intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);

                        MifareClassic mfc =MifareClassic.get(tagFromIntent);



                try {

                        mfc.connect();



                       if(tapDialog.isShowing()) {

                                switch(tapDialog.getTag()) {

                                        caseDIALOG_CARGAR:

                                                if(mfc.authenticateSectorWithKeyB(0x08, KEY_B_SECTOR_8)) {

                                                mfc.writeBlock(0x21, DATA_CARGA_B21);

                                                mfc.writeBlock(0x22, DATA_CARGA_B22);

                                        }else {

                                                Toast.makeText(this, "error autenticando sector 0x21", Toast.LENGTH_LONG).show();

                                        }

                                                break;



                                        caseDIALOG_NUMERO:

                                                if(mfc.authenticateSectorWithKeyB(0x00, KEY_B_SECTOR_0)) {

                                                byte[] data = mfc.readBlock(0x01);

                                                Random rand = new Random();

                                                data[4] = (byte) (rand.nextInt((0xff -0x00) + 1) + 0x00);

                                                data[5] = (byte) (rand.nextInt((0xff -0x00) + 1) + 0x00);

                                                data[6] = (byte) (rand.nextInt((0xff -0x00) + 1) + 0x00);

                                                data[7] = (byte) (rand.nextInt((0xff -0x00) + 1) + 0x00);

                                                mfc.writeBlock(0x01, data);

                                        }else {

                                                Toast.makeText(this, "error autenticando sector 0x00", Toast.LENGTH_LONG).show();

                                        }

                                                break;

                                        }

                        }



                        //

                        // datos de la tarjeta

                        // ----------------------------------------------------------------

                        //

                        TextView tvNumeroUUID =(TextView)findViewById(R.id.tvNumeroUUID);

                        TextView tvNumeroBIP= (TextView)findViewById(R.id.tvNumeroBIP);

                        TextView tvSaldoBIP= (TextView)findViewById(R.id.tvSaldoBIP);



                        // uuid

                        tvNumeroUUID.setText(leToNumericString(mfc.getTag().getId(),4));



                        // numero bip

                       if(mfc.authenticateSectorWithKeyB(0x00, KEY_B_SECTOR_0)) {

                                byte[] data= mfc.readBlock(0x01);

                                tvNumeroBIP.setText(leToNumericString(newbyte[]{data[4],data[5],data[6],data[7]},4));

                        } else {

                                Toast.makeText(this, "error autenticando sector 0x00", Toast.LENGTH_LONG).show();

                        }



                        // saldo bip

                       if(mfc.authenticateSectorWithKeyB(0x08, KEY_B_SECTOR_8)) {

                                byte[] data= mfc.readBlock(0x21);

                                tvSaldoBIP.setText(formatMoneda(leToNumeric(data,2)));

                        } else {

                                Toast.makeText(this, "error autenticando sector 0x21", Toast.LENGTH_LONG).show();

                        }



                } catch (Exception e) {

                                Log.e("error", e.getLocalizedMessage());

                                Toast.makeText(this, e.getLocalizedMessage(), Toast.LENGTH_LONG).show();

                } finally {

                        try {mfc.close();}catch (IOException e) {}

                }

                }



                tapDialog.dismiss();

    }



    private long leToNumeric(byte[] buffer,int size) {

        long value = 0;

        for (int i=0; i<size; i++) { value+= ((long) buffer[i] & 0xffL) << (8 * i); }

        return value;

    }



    private String leToNumericString(byte[]buffer, int size) {

        returnString.valueOf(leToNumeric(buffer, size));

    }



    private String formatMoneda(long valor){

        return "$"+String.format("%,d", valor);

    }

}