android nfc MifareUltralight读写

android nfc MifareUltralight读写

MifareUltralight :是techlist中的一种类型，共16页，每页4个字节，也就是一页只能存2个汉字或者4个字母,0到3页  也就是前四页用来存卡片信息的，所以往MifareUltralight写数据，只能从第四页开始写，总共可以写入除了自带的卡片信息，可以写入4到15页数据，也就是56个字节，折算出来就是最多可写28个汉字或者56个字符。

找MifareUltralight 卡片靠近手机摄像头附近  即可测试  demo地址

http://download.csdn.net/detail/u012303938/9282985

 

源码：

 

package com.example.writefnc;

import java.io.IOException;
import java.nio.charset.Charset;
import java.util.Arrays;

import android.support.v7.app.ActionBarActivity;
import android.app.PendingIntent;
import android.content.Intent;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.nfc.tech.MifareUltralight;
import android.nfc.tech.Ndef;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.CheckBox;
import android.widget.TextView;
import android.widget.Toast;


public class MainActivity extends ActionBarActivity {

    private NfcAdapter nfcAdapter;
    private PendingIntent intent;
    CheckBox checkBox1;
    TextView textView1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        checkBox1=(CheckBox) findViewById(R.id.checkBox1);
        textView1=(TextView) findViewById(R.id.textView1);
        nfcAdapter=NfcAdapter.getDefaultAdapter(this);
        intent=PendingIntent.getActivity(this, 0, new Intent(this,getClass()), 0);
    }
     @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        nfcAdapter.enableForegroundDispatch(this, intent, null, null);
    }
     @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
        nfcAdapter.disableForegroundDispatch(this);
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
    @Override
    protected void onNewIntent(Intent intent) {
        // TODO Auto-generated method stub
        super.onNewIntent(intent);
        Tag tag=intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
        Toast.makeText(this, "获取tag", Toast.LENGTH_SHORT).show();
        if(checkBox1.isChecked()){
            Toast.makeText(this, "选择读取", Toast.LENGTH_SHORT).show();
            textView1.setText(readTag(tag));
        }else{
            Toast.makeText(this, "选择写入", Toast.LENGTH_SHORT).show();
            writeTag(tag);
        }

    }
    public void writeTag(Tag tag){
        String[] techlist=tag.getTechList();
        if(Arrays.toString(techlist).contains("MifareUltralight")){
            MifareUltralight mifareUltralight=MifareUltralight.get(tag);
            try {
                mifareUltralight.connect();
                Toast.makeText(this, "开始写", Toast.LENGTH_SHORT).show();
                mifareUltralight.writePage(4, "你好".getBytes(Charset.forName("GB2312")));
                mifareUltralight.writePage(5, "中国".getBytes(Charset.forName("GB2312")));
                mifareUltralight.writePage(6, "人们".getBytes(Charset.forName("GB2312")));
                mifareUltralight.writePage(7, "百姓".getBytes(Charset.forName("GB2312")));            mifareUltralight.writePage(7, "百姓".getBytes(Charset.forName("GB2312")));


                Toast.makeText(this, "写入完成", Toast.LENGTH_SHORT).show();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }finally{
                try {
                    mifareUltralight.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }else{
            Toast.makeText(this, "不是MifareUltralightle类型", Toast.LENGTH_SHORT).show();
        }

    }
    public String readTag(Tag tag){
        String[] techlist=tag.getTechList();
        if(Arrays.toString(techlist).contains("MifareUltralight")){
        MifareUltralight mifareUltralight=MifareUltralight.get(tag);
        Toast.makeText(this, "开始读", Toast.LENGTH_SHORT).show();
        try {
            mifareUltralight.connect();

            byte[] data=mifareUltralight.readPages(4);
            return new String(data,Charset.forName("GB2312"));

        } catch (Exception e) {
            // TODO: handle exception
        }finally{
            try {
                mifareUltralight.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

        }else{
            Toast.makeText(this, "不是MifareUltralightle类型", Toast.LENGTH_SHORT).show();
        }
        return null;
    }

}