背景：

在使用定位、相机、文件、电话，需要用户同意授权时，华为和vivo需要告知用户使用权限目的。

方案：

在uni授权时，弹框告诉授权目的，效果如下：

代码：

const perListener = {// 初始化状态state: {// 处理应用程序权限请求WRITE_EXTERNAL_STORAGE: false,ACCESS_FINE_LOCATION: false,CALL_PHONE: false,/* #ifdef APP-PLUS */isIos: plus.os.name == "iOS",/* #endif */mapping: {'WRITE_EXTERNAL_STORAGE': {title: "拍摄/相册权限说明",content: "用于司机在车辆发生事故时，可以快速上传事故图片等材料，用于协助司机处理出险问题。",methods: 'SET_WRITE_EXTERNAL_STORAGE'},'ACCESS_FINE_LOCATION': {title: "定位权限说明",content: "用于获取用户位置，以便为用户提供有地域特点的服务。",methods: 'SET_ACCESS_FINE_LOCATION'},'CALL_PHONE': {title: "拨打电话权限说明",content: "允许应用获取本机号码，以便用户得到更便捷的服务。",methods: 'SET_CALL_PHONE'}}},mutations: {// 管理权限告知目的SET_WRITE_EXTERNAL_STORAGE(state, val) {state.WRITE_EXTERNAL_STORAGE = val},SET_CALL_PHONE(state, val) {state.CALL_PHONE = val},SET_ACCESS_FINE_LOCATION(state, val) {state.ACCESS_FINE_LOCATION = val}},actions: {//权限获取async requestPermissions({state,dispatch,commit}, permissionID) {try {if (!state[permissionID] && !state.isIos) {var viewObj = await dispatch('nativeObjView', permissionID);viewObj.show();}console.log('android.permission.' + permissionID, '当前手机权限');let model = uni.getSystemInfoSync().brand.toLowerCase();return new Promise(async (resolve, reject) => {//苹果不需要这个if (state.isIos) {resolve(1);return}if (model != 'vivo' && model != 'huawei') {resolve(1);return;}// Android权限查询function requestAndroidPermission(permissionID_) {return new Promise((resolve, reject) => {plus.android.requestPermissions([permissionID_], // 理论上支持多个权限同时查询，但实际上本函数封装只处理了一个权限的情况。有需要的可自行扩展封装function(resultObj) {console.log('resultObj', resultObj)var result = 0;for (var i = 0; i < resultObj.granted.length; i++) {// var grantedPermission = resultObj.granted[i];console.log('已获取的权限：');result = 1}for (var i = 0; i < resultObj.deniedPresent.length; i++) {// var deniedPresentPermission = resultObj.deniedPresent[i];console.log('拒绝本次申请的权限：');result = 0}for (var i = 0; i < resultObj.deniedAlways.length; i++) {// var deniedAlwaysPermission = resultObj.deniedAlways[i];// console.log('永久拒绝申请的权限：' + deniedAlwaysPermission);result = -1}resolve(result);},function(error) {console.log('申请权限错误：' + error.code + " = " + error.message);resolve({code: error.code,message: error.message});});});}const result = await requestAndroidPermission('android.permission.' + permissionID);console.log('result', result)if (result === 1) {//'已获得授权'commit(state.mapping[permissionID].methods, true)} else if (result === 0) {//'未获得授权'commit(state.mapping[permissionID].methods, false)} else {commit(state.mapping[permissionID].methods, true)uni.showModal({title: '提示',content: '操作权限已被拒绝，请手动前往设置',confirmText: "立即设置",success: (res) => {if (res.confirm) {dispatch('gotoAppPermissionSetting')}}})}if (viewObj) viewObj.close()resolve(result);});} catch (error) {console.log(error);reject(error);}},//提示框nativeObjView({state}, permissionID) {const systemInfo = uni.getSystemInfoSync();const statusBarHeight = systemInfo.statusBarHeight;const navigationBarHeight = systemInfo.platform === 'android' ? 48 :44; // Set the navigation bar height based on the platformconst totalHeight = statusBarHeight + navigationBarHeight;let view = new plus.nativeObj.View('per-modal', {top: '0px',left: '0px',width: '100%',backgroundColor: '#444',//opacity: .5;})view.drawRect({color: '#fff',radius: '5px'}, {top: totalHeight + 'px',left: '5%',width: '90%',height: "100px",})view.drawText(state.mapping[permissionID].title, {top: totalHeight + 5 + 'px',left: "8%",height: "30px"}, {align: "left",color: "#000",}, {onClick: function(e) {console.log(e);}})view.drawText(state.mapping[permissionID].content, {top: totalHeight + 35 + 'px',height: "60px",left: "8%",width: "84%"}, {whiteSpace: 'normal',size: "14px",align: "left",color: "#656563"})function show() {view = plus.nativeObj.View.getViewById('per-modal');view.show()view = null //展示的时候也得清空，不然影响下次的关闭，不知道为啥}function close() {view = plus.nativeObj.View.getViewById('per-modal');view.close();view = null}return {show,close}},// 跳转到**应用**的权限页面gotoAppPermissionSetting({state}) {if (state.isIos) {var UIApplication = plus.ios.import("UIApplication");var application2 = UIApplication.sharedApplication();var NSURL2 = plus.ios.import("NSURL");// var setting2 = NSURL2.URLWithString("prefs:root=LOCATION_SERVICES");		var setting2 = NSURL2.URLWithString("app-settings:");application2.openURL(setting2);plus.ios.deleteObject(setting2);plus.ios.deleteObject(NSURL2);plus.ios.deleteObject(application2);} else {// console.log(plus.device.vendor);var Intent = plus.android.importClass("android.content.Intent");var Settings = plus.android.importClass("android.provider.Settings");var Uri = plus.android.importClass("android.net.Uri");var mainActivity = plus.android.runtimeMainActivity();var intent = new Intent();intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);var uri = Uri.fromParts("package", mainActivity.getPackageName(), null);intent.setData(uri);mainActivity.startActivity(intent);}}}}
export default perListener

使用：

async handleCall(phone) {// #ifdef APP-PLUSlet result = await this.$store.dispatch("requestPermissions",'CALL_PHONE')if (result !== 1) return// #endifuni.makePhoneCall({phoneNumber: phone})
},