欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页

android rfid 的开发 androidrfidnfc 

程序员文章站 2022-04-09 07:50:58
...

 

                昨天同事找我帮忙看看 rfid 开发的时候,一扫描就直接弹出activity的问题。

                网上也有蛮多例子,但是能直接拿来参考写实际项目的没几个,系统提供的demo呢,一扫描标签就弹出activity,也是开发中不想要的。于是进入苦逼模式,进过分析和翻资料、百度、终于解决了。下面是代码:

 

   先看项目图片, 我是直接用demo修改的:

android  rfid 的开发
            
    
    
        androidrfidnfc 
 

 

1、清单文件: 

      需求添加权限啦什么,自己看啊,

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.nl.nfcdemo"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="10"
        android:targetSdkVersion="15" />
    <!-- 添加nfc权限 -->
    <uses-permission android:name="android.permission.NFC" />

    <uses-feature
        android:name="android.hardware.nfc"
        android:required="true" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.nl.nfcdemo.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        
    </application>

</manifest>

 

 

    2、MainAcivity类。

 

   

package com.nl.nfcdemo;

import android.app.Activity;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.IntentFilter.MalformedMimeTypeException;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.nfc.tech.MifareClassic;
import android.nfc.tech.NfcV;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

    private final String ACTION_NAME = "android.nfc.action.TECH_DISCOVERED";  
    NfcAdapter nfcAdapter;
    TextView   promt;
    private PendingIntent mPendingIntent;
    private IntentFilter [] mIntentFilters;
    private String[][] mTechLists;
    
    @Override
    public void onCreate(Bundle savedInstanceState){
        super.onCreate (savedInstanceState);
        setContentView (R.layout.activity_main);
        
        promt = (TextView) findViewById (R.id.promt);
         
        // 获取默认的NFC控制器
        nfcAdapter = NfcAdapter.getDefaultAdapter (this);
        if (nfcAdapter == null) {
            promt.setText ("设备不支持NFC!");
            finish ();
            return;
        }
        if (!nfcAdapter.isEnabled ()) {
            promt.setText ("请在系统设置中先启用NFC功能!");
            finish ();
            return;
        }
        
        initNFC();
    }
    
    
    

    /**
     *@Description: 初始化
     *@Author:杨攀
     *@Since: 2016年4月27日下午5:38:15
     */
    private void initNFC(){
        //绑定Intent
        Intent mIntent = new Intent (ACTION_NAME);
        mPendingIntent = PendingIntent.getActivity(this, 0, new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
        
        IntentFilter techFilter = new IntentFilter (nfcAdapter.ACTION_TECH_DISCOVERED);
        try {
            techFilter.addDataType ("text/plain");
            mIntentFilters = new IntentFilter[]{techFilter};
        } catch (MalformedMimeTypeException e) {
            e.printStackTrace();
        }
        
        mTechLists  = new String[][] { 
                new String[] {"android.nfc.tech.NfcA"},
                new String[]{"android.nfc.tech.NfcB"},
                new String[]{"android.nfc.tech.NfcF"},
                new String[]{"android.nfc.tech.NfcV"},
                new String[]{"android.nfc.tech.Ndef"},
                new String[]{"android.nfc.tech.NdefFormatable"},
                new String[]{"android.nfc.tech.IsoDep"},
                new String[]{"android.nfc.tech.MifareClassic"},
                new String[]{"android.nfc.tech.MifareUltralight"}
                };
    }

    /**
     *@Description: 拦截系统的 intent, 然后触发读写操作
     *@Author:杨攀
     *@Since: 2016年4月27日下午5:08:20
     *@param intent
     */
    @Override
    protected void onNewIntent(Intent intent){
        super.onNewIntent (intent);
        // 得到是否检测到ACTION_TECH_DISCOVERED触发
        if (NfcAdapter.ACTION_TECH_DISCOVERED.equals (intent.getAction ())) {
            // 处理该intent
            processIntent (intent);
        }
    }


    /**
     *@Description: 注册 意图 
     *@Author:杨攀
     *@Since: 2016年4月27日下午5:34:21
     */
    @Override
    protected void onResume(){
        super.onResume ();
        nfcAdapter.enableForegroundDispatch (this, mPendingIntent, mIntentFilters, mTechLists);
    }

    /**
     *@Description: 窗口关闭的时候,注销意图
     *@Author:杨攀
     *@Since: 2016年4月27日下午5:34:35
     */
    @Override
    protected void onPause(){
        super.onPause ();
        //注销注册
        nfcAdapter.disableForegroundDispatch(this); 
    }
    
    @Override
    protected void onDestroy(){
        super.onDestroy ();
    }
    
    // 字符序列转换为16进制字符串
    private String bytesToHexString(byte[] src){
        StringBuilder stringBuilder = new StringBuilder ("0x");
        if (src == null || src.length <= 0) { return null; }
        char[] buffer = new char[2];
        for ( int i = 0 ; i < src.length ; i++ ) {
            buffer[0] = Character.forDigit ((src[i] >>> 4) & 0x0F, 16);
            buffer[1] = Character.forDigit (src[i] & 0x0F, 16);
            System.out.println (buffer);
            stringBuilder.append (buffer);
        }
        return stringBuilder.toString ();
    }

    /**
     * Parses the NDEF Message from the intent and prints to the TextView
     */
    private void processIntent(Intent intent){
        // 取出封装在intent中的TAG
        Tag tagFromIntent = intent.getParcelableExtra (NfcAdapter.EXTRA_TAG);
        for ( String tech : tagFromIntent.getTechList () ) {
            System.out.println (tech);
        }
        boolean auth = false;
        // 读取TAG
        MifareClassic mfc = MifareClassic.get (tagFromIntent);
        String metaInfo = "本标签的UID为" + Coverter.getUid (intent) + "\n";
        if (mfc != null) {
            try {
                // Enable I/O operations to the tag from this TagTechnology
                // object.
                mfc.connect ();
                int type = mfc.getType ();// 获取TAG的类型
                int sectorCount = mfc.getSectorCount ();// 获取TAG中包含的扇区数
                String typeS = "";
                switch (type) {
                    case MifareClassic.TYPE_CLASSIC:
                        typeS = "TYPE_CLASSIC";
                        break;
                    case MifareClassic.TYPE_PLUS:
                        typeS = "TYPE_PLUS";
                        break;
                    case MifareClassic.TYPE_PRO:
                        typeS = "TYPE_PRO";
                        break;
                    case MifareClassic.TYPE_UNKNOWN:
                        typeS = "TYPE_UNKNOWN";
                        break;
                }
                metaInfo += "卡片类型:" + typeS + "\n共" + sectorCount + "个扇区\n共" + mfc.getBlockCount () + "个块\n存储空间: " + mfc.getSize () + "B\n";
                for ( int j = 0 ; j < sectorCount ; j++ ) {
                    // Authenticate a sector with key A.
                    auth = mfc.authenticateSectorWithKeyA (j, MifareClassic.KEY_DEFAULT);
                    int bCount;
                    int bIndex;
                    if (auth) {
                        metaInfo += "Sector " + j + ":验证成功\n";
                        // 读取扇区中的块
                        bCount = mfc.getBlockCountInSector (j);
                        bIndex = mfc.sectorToBlock (j);
                        for ( int i = 0 ; i < bCount ; i++ ) {
                            byte[] data = mfc.readBlock (bIndex);
                            metaInfo += "Block " + bIndex + " : " + bytesToHexString (data) + "\n";
                            bIndex++;
                        }
                    } else {
                        metaInfo += "Sector " + j + ":验证失败\n";
                    }
                }
            } catch (Exception e) {
                e.printStackTrace ();
            }
        }
        promt.setText (metaInfo);
    }

}

 

 

 

经过运行,可以。我在上传 项目的压缩包。需要的自行下载。

 

 

  • android  rfid 的开发
            
    
    
        androidrfidnfc 
  • 大小: 15 KB
相关标签: android rfid nfc