本文实例为大家分享了uni-app实现NFC读取功能的具体代码，供大家参考，具体内容如下
好久没有写博客了，今天难得有空重新记录自己学习的点点滴滴。
1、NFC方法.js
// 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 readyRead = true; //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];
//重点部分代码
const promise = new Promise((resolve, reject) => {
plus.globalEvent.addEventListener('newintent', function() {
// 轮询调用 NFC
// setTimeout(that.nfcRuning(resolve), 1000);
setTimeout(() => {
that.nfcRuning(resolve)
}, 1000);
});
})
nfcAdapter.enableForegroundDispatch(main, pendingIntent, intentFiltersArray, techListsArray);
return promise
} catch (e) {
}
},
nfcRuning: function(resolve) {
// 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;
if (package_TECH_DISCOVERED == intent.getAction()) {
if (readyRead) {
//这里通过read方法拿到NFC数据
const id = that.read(intent);
// readyRead = false;
//将数据返回出去
resolve(id)
}
}
},
read(intent) {
// 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);
return nfc_id;
},
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;
},
}
function toast(content) {
uni.showToast({
title: content,
icon: 'none'
})
}2、在用NFC的页面调用方法
<view class="flex nfc-ewm">
<view class="nfc-ewm-item" style="border-right: 1px solid #ccc;" @click="testNFC">
<image src="@/assets/images/application/icon-nfc.png" alt=""></image>NFC感应
</view>
<view class="nfc-ewm-item" @click="openScanCode">
<image src="@/assets/images/application/icon-ewm.png" alt=""></image>二维码扫描
</view>
</view>
import testtest from "../../../../../components/hexiii-nfc/hexiii-nfc.js"
methods：{
async testNFC() {
//这里用异步获取读取到的NFC数据
const nfcId = await testtest.listenNFCStatus();
//console.log(nfcId )
//以下数据是我的业务逻辑代码，如果只要读取NFC数据上面那一行代码即可了。
const arr = []
this.list2.forEach(e => {
arr.push(e.code)
})
if(!nfcId) return
if ( arr.indexOf(nfcId) === -1) {
uni.showToast({
icon: 'none',
title: '未找到对应巡检点!',
duration: 2000
});
} else {
uni.showToast({
icon: 'none',
title: '识别成功!',
duration: 2000
});
uni.navigateTo({
url: `/pages/application/XunJianGuanLi/XunJianRenWu/KaiShiXunJian3/index?id=${this.id}&spotCode=${nfcId}&delta=${this.delta+1}`,
});
}
},
}3、页面效果图
4、总结
以上就是我读取NFC数据的实现了，根据用户扫描NFC读取的数据自动跳转到对应的签到巡检点。代码还有待完善，请多多指导，第一部分中NFC的方法，因为我只需要读取代码，所以很多多余的、不用的代码已被我删除了，只留下了需要的代码。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程网。
