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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
{{title}}
wangqin1
wangqin2
//
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();
}
}
}
.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;
}
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。
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