标签：toast uniapp nfc NFC 读写 let plus android

1.先添加权限

"<uses-permission android:name=\"android.permission.NFC\"/>"

2.添加NFC调用js

import store from '@/store/index.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 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:666,name:aaa,stie:ffff.com}';
let readResult = '';

export default {
    listenNFCStatus: function () {
        console.log("---------监听NFC状态--------------")
        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("--------------NFC 运行---------------")
        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) {  //写代码
        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);  //写入数据
                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) { // 读代码
        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);
            // 写入vuex
            store.commit('setNfcReadTxt', data);
            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) { // 将字节数组转换为字符串  
        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 () { // 更改写状态
        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 () { // 更改读状态
        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！');
    },
    // close: function(){
        
    // },
    setTxt: function(txt){
        if(noNFC){
            toast('请检查设备是否支持并开启 NFC 功能！');
            return;
        }
        text = txt;
    }
}
function toast(content){
    uni.showToast({
        title: content,
        icon: 'none'
    })
}

3.页面引用调用

<template>
    <view class="nfc">
        <nav-bar title="NFC模板" ></nav-bar>
        <textarea class="txtarea" disabled :value="$store.getters.nfcreadtxt" placeholder="这是读取到的nfc的数据"/>
        <button class="btn" @tap="read()">读取NFC</button>
        <textarea class="txtarea" v-model="writeTxt" maxlength="124" placeholder="这是输入写入的nfc的数据"/>
        <button class="btn" @tap="write()">写入NFC</button>
    </view>
</template>

<script>
    // nfc 输入最大数字长度为124位，文字为41位
    // 如果需要写入读取之后的回调，可以使用mixins混入read-write-nfc.js
    import NavBar from '../../common/components/navbar/NavBar.vue'
    import nfctest from "@/common/js/nfc/read-write-nfc.js"
    export default {
        data() {
            return {
                writeTxt:''
            }
        },
        components:{
            NavBar
        },
        mounted() {
        },
        onl oad() {
            // 开启nfc监听
            nfctest.listenNFCStatus();
        },
        methods: {
            read(){
               // 调用 js 文件里面的方法
                nfctest.readData();
            },
            write(){
               // 调用 js 文件里面的方法
                nfctest.setTxt(this.writeTxt);
                nfctest.writeData();
            },
        }
    }
</script>

<style scoped lang="less">
    .nfc{
        padding: 20rpx;
        .txt{
            height: 240rpx;
            line-height: 50rpx;
            font-size: 32rpx;
        }
        .txtarea{
            width: 100%;
            min-height: 240rpx;
            border: 1px solid #f0f0f0;
        }
        .btn{
            border: none;
            background-color: #1b85e9;
            color: #fff;
            margin: 20rpx 0;
        }
    }
</style>

标签：toast,uniapp,nfc,NFC,读写,let,plus,android
来源： https://www.cnblogs.com/fhysy/p/15714662.html

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