uniapp-安卓NFC读取

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var NfcAdapter; var NdefRecord; var NdefMessage; var _getCardNo;   export default {     initNFC() {         if (uni.getSystemInfoSync().platform == 'android') {             listenNFCStatus()         }     },     readNFC(callback) {         if (uni.getSystemInfoSync().platform == 'android') {             readData(callback);         }     },     closeNFC() {         if (uni.getSystemInfoSync().platform == 'android') {             closeReadAndWrite();         }     } }   function listenNFCStatus() {     try {         var main = plus.android.runtimeMainActivity();         var Intent = plus.android.importClass('android.content.Intent');         var Activity = plus.android.importClass('android.app.Activity');         var PendingIntent = plus.android.importClass('android.app.PendingIntent');         var IntentFilter = plus.android.importClass('android.content.IntentFilter');         NfcAdapter = plus.android.importClass('android.nfc.NfcAdapter');         var nfcAdapter = NfcAdapter.getDefaultAdapter(main);           if (nfcAdapter == null) {             uni.showToast({                 title: '设备不支持NFC！',                 icon: 'none'             })             return;         }                   if (!nfcAdapter.isEnabled()) {             uni.showToast({                 title: '请在系统设置中先启用NFC功能！',                 icon: 'none'             });             return;         }           var intent = new Intent(main, main.getClass());         intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);         var pendingIntent = PendingIntent.getActivity(main, 0, intent, 0);         var ndef = new IntentFilter("android.nfc.action.TECH_DISCOVERED");         ndef.addDataType("*/*");         var intentFiltersArray = [ndef];         var techListsArray = [             ["android.nfc.tech.IsoDep"],             ["android.nfc.tech.NfcA"],             ["android.nfc.tech.NfcB"],             ["android.nfc.tech.NfcF"],             ["android.nfc.tech.Nfcf"],             ["android.nfc.tech.NfcV"],             ["android.nfc.tech.NdefFormatable"],             ["android.nfc.tech.MifareClassic"],             ["android.nfc.tech.MifareUltralight"]         ];         plus.globalEvent.addEventListener("newintent",             function() {                 setTimeout(handle_nfc_data1, 1000);             }, false);         plus.globalEvent.addEventListener("pause", function(e) {             if (nfcAdapter) {                 nfcAdapter.disableForegroundDispatch(main);             }         }, false);         plus.globalEvent.addEventListener("resume", function(e) {             if (nfcAdapter) {                 //console.log('resume');                  nfcAdapter.enableForegroundDispatch(main, pendingIntent, intentFiltersArray, techListsArray);             }         }, false);         nfcAdapter.enableForegroundDispatch(main, pendingIntent, intentFiltersArray, techListsArray);     } catch (e) {         console.error(e);     } }   function handle_nfc_data1() {     NdefRecord = plus.android.importClass("android.nfc.NdefRecord");     NdefMessage = plus.android.importClass("android.nfc.NdefMessage");     var main = plus.android.runtimeMainActivity();     var intent = main.getIntent();     //console.log("action type:" + intent.getAction());      if ("android.nfc.action.TECH_DISCOVERED" == intent.getAction()) {         if (readyWriteData) {             //__write(intent);             readyWriteData = false;         } else if (readyRead) {             __read(intent);             readyRead = false;         }     } }   function showToast(msg) {     plus.nativeUI.toast(msg); }   // function __write(intent) { //  try { //      waiting.setTitle('请勿移开标签\n正在写入...'); //      var text = document.getElementById('text').value; //      console.log("text=" + text); //      var textBytes = plus.android.invoke(text, "getBytes"); //      var textRecord = new NdefRecord(NdefRecord.TNF_MIME_MEDIA, //          plus.android.invoke("text/plain", "getBytes"), plus.android.invoke("", "getBytes"), textBytes); //      var message = new NdefMessage([textRecord]); //      var Ndef = plus.android.importClass('android.nfc.tech.Ndef'); //      var NdefFormatable = plus.android.importClass('android.nfc.tech.NdefFormatable'); //      var tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG); //      var ndef = Ndef.get(tag); //      if (ndef != null) { //          var size = message.toByteArray().length; //          console.log("size=" + size); //          ndef.connect(); //          if (!ndef.isWritable()) { //              showToast("tag不允许写入"); //              waiting.close(); //              return; //          } //          if (ndef.getMaxSize() < size) { //              showToast("文件大小超出容量"); //              waiting.close(); //              return; //          }   //          ndef.writeNdefMessage(message); //          waiting.close(); //          showToast("写入数据成功."); //          return; //      } else { //          var format = NdefFormatable.get(tag); //          if (format != null) { //              try { //                  format.connect(); //                  format.format(message); //                  showToast("格式化tag并且写入message"); //                  waiting.close(); //                  return; //              } catch (e) { //                  showToast("格式化tag失败."); //                  waiting.close(); //                  return; //              } //          } else { //              showToast("Tag不支持NDEF"); //              waiting.close(); //              return; //          } //      } //  } catch (e) { //      console.log("error=" + e); //      waiting.close(); //      alert('写入失败'); //  }   // }   function __read(intent) {     try {         var content = "";         waiting.setTitle('请勿移开标签\n正在读取数据...');         var tag = plus.android.importClass("android.nfc.Tag");         tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);         var bytesId = intent.getByteArrayExtra(NfcAdapter.EXTRA_ID);         waiting.close();         var tagid = bytesToHexString(tag.getId())         if (typeof _getCardNo === 'function') {             _getCardNo(tagid);         }     } catch (e) {         uni.showToast({             title: e,             icon: 'none'         });     } }   function bytesToHexString(inarray) {     var i, j, x;     var hex = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A",         "B", "C", "D", "E", "F"     ];     var out = "";     for (j = 0; j < inarray.length; ++j) {         x = parseInt(inarray[j]) & 0xff;         i = (x >> 4) & 0x0f;         out += hex[i];         i = x & 0x0f;         out += hex[i];     }     return out; }   function reverseTwo(str) {       var str1 = "";     for (var i = 1; i <= str.length; i++) {         str1 += str[i - 1];         if (i % 2 == 0) {             if (i == str.length) {                 break;             }             str1 += ":";         }     }     var str2 = "";     for (var i = str1.split(":").length - 1; i >= 0; i--) {         str2 += str1.split(":")[i];     }     return str2; }   if (uni.getSystemInfoSync().platform == 'android') {     //plus.globalEvent.addEventListener('plusready', listenNFCStatus, false); }   var waiting; var readyWriteData = false; var readyRead = false;   function writeData() {     var textEle = plus.globalEvent.getElementById('text');     if (!textEle.value) {         uni.showToast({             title: '请输入要写入的内容！',             icon: 'none'         });         return;     }     readyWriteData = true;     waiting = plus.nativeUI.showWaiting("请将NFC标签靠近！"); }   function readData(getCardNo) {     readyRead = true;     _getCardNo = getCardNo     waiting = plus.nativeUI.showWaiting("请将NFC标签靠近！", {         modal: false     }); }   function closeReadAndWrite() {     readyWriteData = false;     readyRead = false;       if (waiting) {         waiting.close();     } }

　　使用

1、引用

import nfc from "@/common/nfc.js"

2、初始化

nfc.initNFC();

3、读取

nfc.readNFC(function(nfcid) {

})

4、关闭读取

nfc.closeNFC();