NFC读写实例

package com.sy.nfc.test;

import java.io.IOException;

import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.nfc.tech.MifareClassic;
import android.nfc.tech.Ndef;
import android.nfc.tech.NdefFormatable;
import android.nfc.tech.NfcA;
import android.os.Bundle;
import android.os.Parcelable;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.PendingIntent;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

/**
 * 
 * @author shenyang
 * @see
 * @des
 * 
 *      Nfc 标签的扫描
 * 
 * 
 */
@SuppressLint("NewApi")
public class ReadTag extends Activity {
    private NfcAdapter nfcAdapter;
    private TextView resultText;
    private PendingIntent pendingIntent;
    private IntentFilter[] mFilters;
    private String[][] mTechLists;
    private Button mJumpTagBtn;
    private boolean isFirst = true;

    @SuppressLint("NewApi")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // 获取nfc适配器，判断设备是否支持NFC功能
        nfcAdapter = NfcAdapter.getDefaultAdapter(this);
        if (nfcAdapter == null) {
            Toast.makeText(this, getResources().getString(R.string.no_nfc),
                    Toast.LENGTH_SHORT).show();
            finish();
            return;
        } else if (!nfcAdapter.isEnabled()) {
            Toast.makeText(this, getResources().getString(R.string.open_nfc),
                    Toast.LENGTH_SHORT).show();
            finish();
            return;
        }
        setContentView(R.layout.read_tag);
        // 显示结果Text
        resultText = (TextView) findViewById(R.id.resultText);
        // 写入标签按钮
        mJumpTagBtn = (Button) findViewById(R.id.jump);
        mJumpTagBtn.setOnClickListener(new WriteBtnOnClick());

        pendingIntent = PendingIntent.getActivity(this, 0, new Intent(this,
                getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
        IntentFilter ndef = new IntentFilter(NfcAdapter.ACTION_TECH_DISCOVERED);
        ndef.addCategory("*/*");
        mFilters = new IntentFilter[] { ndef };// 过滤器
        mTechLists = new String[][] {
                new String[] { MifareClassic.class.getName() },
                new String[] { NfcA.class.getName() } };// 允许扫描的标签类型

    }

    @SuppressLint("NewApi")
    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        nfcAdapter.enableForegroundDispatch(this, pendingIntent, mFilters,
                mTechLists);
        if (isFirst) {
            if (NfcAdapter.ACTION_TECH_DISCOVERED.equals(getIntent().getAction())) {
                String result = processIntent(getIntent());
                resultText.setText(result);
            }
            isFirst = false;
        }

    }

    @Override
    protected void onNewIntent(Intent intent) {
        // TODO Auto-generated method stub
        super.onNewIntent(intent);
        if (NfcAdapter.ACTION_TECH_DISCOVERED.equals(intent.getAction())) {
            String result = processIntent(intent);
            resultText.setText(result);
        }
    }

    /**
     * 获取tab标签中的内容
     * 
     * @param intent
     * @return
     */
    @SuppressLint("NewApi")
    private String processIntent(Intent intent) {
        Parcelable[] rawmsgs = intent
                .getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
        NdefMessage msg = (NdefMessage) rawmsgs[0];
        NdefRecord[] records = msg.getRecords();
        String resultStr = new String(records[0].getPayload());
        return resultStr;
    }

    /**
     * 按钮点击事件
     * 
     * @author shenyang
     * 
     */
    class WriteBtnOnClick implements OnClickListener {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            switch (v.getId()) {
            case R.id.jump:
                Intent intent = new Intent(ReadTag.this, WriteTag.class);
                startActivity(intent);
            default:
                break;
            }
        }

    }

}

读标签内容代码展开