uniapp: Check notification permissions and prompt whether to open them. Click to jump to settings to turn on notification permissions.

getQuanxian() {
    
    
	let platform = uni.getSystemInfoSync().platform; //首先判断app是安卓还是ios
	console.log(platform);
	if (platform == "ios") {
    
     //这里是ios的方法
		console.log("我是iOS");
		var UIApplication = plus.ios.import("UIApplication");
		var app = UIApplication.sharedApplication();
		var enabledTypes = 0;
		if (app.currentUserNotificationSettings) {
    
    
			var settings = app.currentUserNotificationSettings();
			enabledTypes = settings.plusGetAttribute("types");
			console.log("enabledTypes1:" + enabledTypes);
			if (enabledTypes == 0) {
    
     //如果enabledTypes = 0 就是通知权限没有开启
				uni.showModal({
    
    
					title: '提示',
					content: '是否前往打开通知权限',
					success: res => {
    
    
						if (res.confirm) {
    
    
							this.openTongZhi()
						} else if (res.cancel) {
    
    
							console.log('用户点击取消');
						}
					}
				});
			} else {
    
    
				uni.showToast({
    
    
					title: '已开启',
					icon: "none"
				})
			}
		}
		plus.ios.deleteObject(settings);
	} else if (platform == "android") {
    
     //下面是安卓的方法
		console.log("我是安卓", plus.android);
		var main = plus.android.runtimeMainActivity();
		var pkName = main.getPackageName();
		var uid = main.getApplicationInfo().plusGetAttribute("uid");
		var NotificationManagerCompat = plus.android.importClass(
			"android.support.v4.app.NotificationManagerCompat"
		);
		//android.support.v4升级为androidx
		if (NotificationManagerCompat == null) {
    
    
			NotificationManagerCompat = plus.android.importClass(
				"androidx.core.app.NotificationManagerCompat"
			);
		}
		var areNotificationsEnabled =
			NotificationManagerCompat.from(main).areNotificationsEnabled();
		console.log(areNotificationsEnabled);
		// 未开通‘允许通知’权限，则弹窗提醒开通，并点击确认后，跳转到系统设置页面进行设置
		if (!areNotificationsEnabled) {
    
    
			this.tongzhi = true; //这里也一样未开启权限，弹出弹窗
		}
		if (areNotificationsEnabled) {
    
    
			uni.showToast({
    
    
				title: '已开启',
				icon: "none"
			})
		} else {
    
    
			uni.showModal({
    
    
				title: '提示',
				content: '是否前往打开通知权限',
				success: res => {
    
    
					if (res.confirm) {
    
    
						this.openTongZhi()
					} else if (res.cancel) {
    
    
						console.log('用户点击取消');
					}
				}
			});
		}
	}
},
openTongZhi() {
    
     //弹窗按钮绑定方法
	let platform = uni.getSystemInfoSync().platform; //获取安卓还是ios
	if (platform == "ios") {
    
     //如果机型是ios，ios由于权限问题，可能需要手动开启
		var UIApplication = plus.ios.import("UIApplication");
		var app = UIApplication.sharedApplication();
		var settings = app.currentUserNotificationSettings();
		enabledTypes = settings.plusGetAttribute("types");
		var NSURL2 = plus.ios.import("NSURL");
		var setting2 = NSURL2.URLWithString("app-settings:");
		var application2 = UIApplication.sharedApplication();
		application2.openURL(setting2);
		plus.ios.deleteObject(setting2);
		plus.ios.deleteObject(NSURL2);
		plus.ios.deleteObject(application2);
		plus.ios.deleteObject(settings);
	} else if (platform == "android") {
    
     //如果机型是安卓
		var main = plus.android.runtimeMainActivity();
		var pkName = main.getPackageName();
		var uid = main.getApplicationInfo().plusGetAttribute("uid");
		var Intent = plus.android.importClass("android.content.Intent");
		var Build = plus.android.importClass("android.os.Build");
		//android 8.0引导
		if (Build.VERSION.SDK_INT >= 26) {
    
     //判断安卓系统版本
			var intent = new Intent("android.settings.APP_NOTIFICATION_SETTINGS");
			intent.putExtra("android.provider.extra.APP_PACKAGE", pkName);
		} else if (Build.VERSION.SDK_INT >= 21) {
    
     //判断安卓系统版本
			//android 5.0-7.0
			var intent = new Intent("android.settings.APP_NOTIFICATION_SETTINGS");
			intent.putExtra("app_package", pkName);
			intent.putExtra("app_uid", uid);
		} else {
    
    
			//(<21)其他--跳转到该应用管理的详情页
			intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
			var uri = Uri.fromParts(
				"package",
				mainActivity.getPackageName(),
				null
			);
			intent.setData(uri);
		}
		// 跳转到该应用的系统通知设置页
		main.startActivity(intent);
	}
},