// @/scan.js
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const timeout = 5 * 1000; //扫码超时时间
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const main = plus.android.runtimeMainActivity();
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// 全局只允许一个地方获取，存储最新的回调函数，获取完立即销毁
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let scanCallback = null;
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//存储订阅，每个页面可以单独订阅，优先级低于scanCallback
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const subscriptions = [];
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export const byteArrayToString = (array) => {
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return String.fromCharCode.apply(String, array);
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};
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const sleep = (ms) => {
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return new Promise((resolve) => setTimeout(resolve, ms));
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};
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export const registerReceiver = () => {
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//获取Android意图过滤类
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const IntentFilter = plus.android.importClass("android.content.IntentFilter");
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//实例化意图过滤
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const filter = new IntentFilter();
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//获取扫码成功的意图广播,
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filter.addAction("com.rfid.SCAN");
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const receiver = plus.android.implements(
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"io.dcloud.feature.internal.reflect.BroadcastReceiver",
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{
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onReceive: function (context, intent) {
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plus.android.importClass(intent);
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// key 为 厂商提供，需要自己联系厂商获取 ，有的厂商使用getStringExtra就直接可以
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const dataByte = intent.getByteArrayExtra("data");
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const code = byteArrayToString(dataByte);
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console.log("receiver:" + code);
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if (scanCallback) {
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scanCallback(code);
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} else {
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subscriptions.forEach((cb) => cb(code));
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}
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},
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}
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);
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main.registerReceiver(receiver, filter);
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};
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export const openScan = () => {
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//获取Android意图类
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let Intent = plus.android.importClass("android.content.Intent");
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//实例化意图
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let intent = new Intent();
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//定义意图，由厂商提供
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intent.setAction("com.rfid.SCAN_CMD");
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//广播这个意图
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main.sendBroadcast(intent);
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};
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export const scanCode = async () => {
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uni.showLoading({ title: "扫描中", mask: true });
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const getCode = () => {
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return new Promise((resolve) => {
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scanCallback = (code) => {
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resolve(code);
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};
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});
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};
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openScan();
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const res = await Promise.race([getCode(), sleep(timeout)]);
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scanCallback = null;
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uni.hideLoading();
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if (!res) {
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uni.showToast({
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icon: "none",
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title: "扫描失败",
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});
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throw new Error("扫描失败");
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}
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return res;
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};
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export const addSubscription = (callback) => {
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if (callback) {
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subscriptions.push(callback);
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}
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};
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export const removeSubscription = (callback) => {
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const index = subscriptions.findIndex((v) => v === callback);
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if (index > -1) {
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subscriptions.splice(index, 1);
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}
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};
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