关于uni-app手机nfc开启、读取、写入功能

比眉伴天荒 2022-12-25 07:59 885阅读 0赞

关于手机开启nfc功能  
nfc功能开启，分为开启手机的nfc功能和开启app的nfc功能。  
那么app端会用到的nfc功能有哪些呢?  
有nfc读取身份证内容，手机读取nfc签的内容，手机更改nfc签的内容，手机写入nfc签内容。  
关于nfc读取身份证内容，uni-app插件市场有相关插件，可以拿来使用。  
关于手机读取nfc签的内容，手机更改nfc签的内容，手机写入nfc签内容，需要相关js文件来配合app开启nfc、读取、写入等功能，当然需要及时关闭app nfc功能。  
附上js文件：

// 包路径
    const package_NdefRecord = 'android.nfc.NdefRecord';
    const package_NdefMessage = 'android.nfc.NdefMessage';
    const package_TECH_DISCOVERED = 'android.nfc.action.TECH_DISCOVERED';
    const package_Intent = 'android.content.Intent'; 
    const package_Activity = 'android.app.Activity'; 
    const package_PendingIntent = 'android.app.PendingIntent'; 
    const package_IntentFilter = 'android.content.IntentFilter'; 
    const package_NfcAdapter = 'android.nfc.NfcAdapter'; 
    const package_Ndef = 'android.nfc.tech.Ndef'; 
    const package_NdefFormatable = 'android.nfc.tech.NdefFormatable'; 
    const package_Parcelable = 'android.os.Parcelable'; 
    const package_String = 'java.lang.String'; 
    
    let NfcAdapter;
    let NdefRecord;
    let NdefMessage;
    let readyWriteData = false;//开启写
    let readyRead = false;//开启读
    let noNFC = false;
    let 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.MifareClassi'],
    	['android.nfc.tech.MifareUltralight']
    ];
    // 要写入的数据
    let text = '{id:8888,name:nfc,stie:wangqin.com}';
    let readResult = '';
    
    export default {
    	listenNFCStatus: function () {
    		console.log("---------listenNFCStatus--------------")
    		let that = this;
    		try {
    			let main = plus.android.runtimeMainActivity();
    			let Intent = plus.android.importClass('android.content.Intent');
    			let Activity = plus.android.importClass('android.app.Activity');
    			let PendingIntent = plus.android.importClass('android.app.PendingIntent');
    			let IntentFilter = plus.android.importClass('android.content.IntentFilter');
    			NfcAdapter = plus.android.importClass('android.nfc.NfcAdapter');
    			let nfcAdapter = NfcAdapter.getDefaultAdapter(main);
    			
    			if(nfcAdapter == null){
    				uni.showToast({
    				  title: '设备不支持NFC！',
    				  icon: 'none'
    				})
    				noNFC = true;
    				return;
    			}
    			
    			if (!nfcAdapter.isEnabled()) {
    				uni.showToast({
    				  title: '请在系统设置中先启用NFC功能！',
    				  icon: 'none'
    				});
    				noNFC = true;
    				return;
    			}else{
    				noNFC = false;
    			}
    			
    			let intent = new Intent(main, main.getClass());
    			intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
    			let pendingIntent = PendingIntent.getActivity(main, 0, intent, 0);
    			let ndef = new IntentFilter("android.nfc.action.TECH_DISCOVERED");
    			ndef.addDataType("*/*");
    			let intentFiltersArray = [ndef];
    			
    			plus.globalEvent.addEventListener('newintent',function() {
    				console.log('newintent running');
    				// 轮询调用 NFC
    				setTimeout(that.nfcRuning(), 1000);
    			});
    			plus.globalEvent.addEventListener('pause',function(e) {
    				console.log('pause running');
    				if (nfcAdapter) {
    					//关闭前台调度系统
    					//恢复默认状态
    					nfcAdapter.disableForegroundDispatch(main);
    				}
    			});
    			plus.globalEvent.addEventListener('resume',function(e) {
    				console.log('resume running');
    				if (nfcAdapter) {
    					 //开启前台调度系统
    					// 优于所有其他NFC
    					nfcAdapter.enableForegroundDispatch(main, pendingIntent, intentFiltersArray, techListsArray);
    				}
    			});
    			nfcAdapter.enableForegroundDispatch(main, pendingIntent, intentFiltersArray, techListsArray); 
    		} catch (e) {
    			console.error(e);
    		}
    	},
    	nfcRuning: function () {
    		console.log("--------------nfcRuning---------------")
    		NdefRecord = plus.android.importClass("android.nfc.NdefRecord");
    		NdefMessage = plus.android.importClass("android.nfc.NdefMessage");
    		let main = plus.android.runtimeMainActivity();
    		let intent = main.getIntent();
    		let that = this;
    		
    		console.log("action type:" + intent.getAction());
    		console.log(package_TECH_DISCOVERED == intent.getAction());
    		if (package_TECH_DISCOVERED == intent.getAction()) {
    			if (readyWriteData) {
    				console.log("----------我在写1-------------")
    				that.write(intent);
    				readyWriteData = false;
    			} else if (readyRead) {
    				console.log("----------我在读1-------------")
    				that.read(intent);
    				readyRead = false;
    			}
    		}
    	},
    	write(intent) {
    		console.log("----------我在写-------------")
    		try {
    			toast('请勿移开标签 正在写入...');
    			console.log("text=" + text);
    			
    			let textBytes = plus.android.invoke(text, "getBytes");
    			// image/jpeg text/plain  
    			let textRecord = new NdefRecord(NdefRecord.TNF_MIME_MEDIA,
    											plus.android.invoke("text/plain", "getBytes"),  
    											plus.android.invoke("", "getBytes"), textBytes);
    			let message = new NdefMessage([textRecord]);
    			let Ndef = plus.android.importClass('android.nfc.tech.Ndef');
    			let NdefFormatable = plus.android.importClass('android.nfc.tech.NdefFormatable');
    			let tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
    			let ndef = Ndef.get(tag);
    			if (ndef != null) {
    				// 待写入的数据长度
    				let size = message.toByteArray().length;
    				ndef.connect();
    				if (!ndef.isWritable()) {
    					toast('tag不允许写入！');
    					return;
    				}
    				if (ndef.getMaxSize() < size) {
    					toast('文件大小超出容量！');
    					return;
    				}
    				ndef.writeNdefMessage(message);
    				toast('写入数据成功！');
    				return;
    			} else {
    				let format = NdefFormatable.get(tag);
    				if (format != null) {
    					try {
    						format.connect();
    						format.format(message);
    						toast('格式化tag并且写入message');
    						return;
    					} catch (e) {
    						toast('格式化tag失败.');
    						return;
    					}
    				} else {
    					toast('Tag不支持NDEF');
    					return;
    				}
    			}
    		} catch (e) {
    			toast('写入失败');
    			console.log("error=" + e);
    		}
    	
    	},
    	read(intent) {
    		console.log("----------我在读read-------------")
    		toast('请勿移开标签正在读取数据');
    		let that = this;
    		// NFC id
    		let bytesId = intent.getByteArrayExtra(NfcAdapter.EXTRA_ID);
    		let nfc_id = that.byteArrayToHexString(bytesId);
    		console.log('nfc_id:', nfc_id);
    		let Parcelable = plus.android.importClass("android.os.Parcelable");
    		let rawmsgs = intent.getParcelableArrayExtra("android.nfc.extra.NDEF_MESSAGES");
    		//let rawmsgs = intent.getParcelableArrayExtra();
    		
    		console.log("数据"+rawmsgs)
    		if(rawmsgs != null && rawmsgs.length > 0) {
    			let records = rawmsgs[0].getRecords();
    			let result = records[0].getPayload();
    			let data = plus.android.newObject("java.lang.String", result);
    			toast('NFC 数据：' + data);
    			console.log('NFC 数据：',data);
    			readResult = data;
    		}else{
    			toast('没有读取到数据');
    		}
    	},
    	byteArrayToHexString: function (inarray) { // converts byte arrays to string  
    		let i, j, inn;  
    		let hex = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F"];  
    		let out = "";  
    		
    		for(j = 0; j < inarray.length; ++j) {
    			inn = inarray[j] & 0xff;  
    			i = (inn >>> 4) & 0x0f;  
    			out += hex[i];  
    			i = inn & 0x0f;  
    			out += hex[i];  
    		}  
    		return out;  
    	},
    	writeData: function () {
    		if(noNFC){
    			toast('请检查设备是否支持并开启 NFC 功能！');
    			return;
    		}
    		// 轮询条件
    		readyWriteData = true;
    		toast('请将NFC标签靠近！');
    	},
    	readData: function () {
    		if(noNFC){
    			toast('请检查设备是否支持并开启 NFC 功能！');
    			return;
    		}
    		// 轮询条件
    		readyRead = true;
    		toast('请将NFC标签靠近！');
    	}
    }
    function toast(content){
    	uni.showToast({
    		title: content,
    		icon: 'none'
    	})
    }

vue.vue文件 来操作 js 文件，调取 js的方法来开启读写

<template>
    	<view class="content">
    		<image class="logo" src="/static/logo.png"></image>
    		<view class="text-area">
    			<text class="title">{
       {title}}</text>
    			<button @tap="testNFC1()">wangqin1</button>
    			<button @tap="testNFC2()">wangqin2</button>
    		</view>
    	</view>
    </template>
    
    <script>
    //
    	import testtest from "../../js_sdk/hexiii-nfc/hexiii-nfc.js"
    	export default {
    		data() {
    			return {
    				title: 'Hello'
    			}
    		},
    		onLoad() {
    
    		},
    		methods: {
    			testNFC1(){
    				testtest.listenNFCStatus();
    			},
    			testNFC2(){
    			   // 调用 js 文件里面的方法
    				testtest.nfcRuning();
    			}
    		}
    	}
    </script>
    
    <style>
    	.content {
    		display: flex;
    		flex-direction: column;
    		align-items: center;
    		justify-content: center;
    	}
    
    	.logo {
    		height: 200rpx;
    		width: 200rpx;
    		margin-top: 200rpx;
    		margin-left: auto;
    		margin-right: auto;
    		margin-bottom: 50rpx;
    	}
    
    	.text-area {
    		display: flex;
    		justify-content: center;
    	}
    
    	.title {
    		font-size: 36rpx;
    		color: #8f8f94;
    	}
    </style>

那vue文件调取js文件中的方法，如何在多个页面中开启关闭呢？可以将开启、关闭的参数存在vuex里面，当前页面使用完成后要及时关闭nfc的读取参数，置为false。