How to set up notifications for changes in cryptocurrency

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In the SaveDeviceSettings function, we get the uuid for the device, and conditionally get the minimum and maximum values for the coin. We save the values to the database using the model. The final function to add will be the Simulate function. Add the following code to the bottom of the file:. In the function above, we fetch the prices for the coins, we then send that to the model.

NotifyDevicesOfPriceChange function, which finds devices with matching criteria and sends them a push notification. We then return a JSON response of the prices , devices and status. Create a new models. In the same file, paste the following to the bottom:. Above, we have the CoinPrice map. This will be used to handle the response from the API we will be using for our application.

The next one is the Device struct. This represents the device resource. It matches the SQL schema of the table we created earlier in the article. When we want to create a new device resource to store in the database or retrieve one, we will use the Device struct. Finally, we have the Devices struct which is simply a collection of multiple Device structs. We use this if we want to return a collection of Device s. The function above is used to create settings for a new device. In the function, a new device is created using the Device struct.

We then write the SQL query we want to use to create a new device. We run Exec on the SQL query to execute the query. We then return the created Device. In the GetSettings function above, we create an empty Device struct. We run the query to fetch a device from the devices table that matches the uuid.

We then use the Scan method of the database package to save the row values to the Device Instance. If no device is found, a new one is created using the CreateSettings function we created earlier, else the device found is returned. In the SaveSettings function above, we get the existing settings using the GetSettings function and then we conditionally update the existing value. We then write an SQL query to update the database with the new values.

After this, we return the Device struct. In the function above, we create a new instance of coinPrice and then we create an array of the two currencies we want to fetch, ETH and BTC. We then loop through the currencies and if simulate is true , we just return the simulated prices for the coins. This is responsible for getting devices that match the minimum and maximum threshold and sending push notifications to them.

In the code above we have two functions, the first is minMaxQuery which is a helper function that helps us generate the SQL query for the min and max of a currency. In here we loop through the currency prices and for each of the price we check the database for devices that match the minimum and maximum prices. When we have the devices, we loop through them and send a push notification using the notification.

SendNotification method. We then return the devices we sent the notification to. In the notifications directory, create a push. In the code above, we have the SendNotification function. We then create a publishRequest variable which contains the Android notification payload. This payload is what we will send to the Pusher Beams backend and will contain everything needed to send the notification to the Android device.

Next, we create an interest variable which will be the interest we want to push the notification to. The format of the interest will match the one we subscribed to in part one of this tutorial. Next, we call the Publish function of the Pusher Beams package to send the notification to the device. Open your terminal and run the following command:. Now that we have finished building the application, we need to run both the backend and the Android application. Open your terminal and execute the following command from the root of the project to run the Go application:.

Next, go to Android Studio and launch your Android project. At this point, you can now see the application. Now minimize the application in your simulator and open the notification center. You should see the notifications come into the device as shown below:.

In this article, we have been able to see how you can create a cryptocurrency watcher application for Android using Pusher Beams and Go. Via Coinbase View Invoice. Upgrade Hobby. Update Extend. Referral Code Earn rewards for referring friends! Learn More. Cancel Membership. Delete Account. Receive product updates and suggestions. Remove our branded links from alerts. Unlock all premium features. Read more about our plans.

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Email is the most basic yet effective way to receive an alert. As long as your email address is confirmed, you're good to go. Download our app to start receiving push notifications directly on your iOS or Android device:. After downloading the app, simply log in with your existing account and grant us permission to send you push notifications. We will soon be phasing out support for our Pushover alerts.

Downloading our new app will migrate existing Pushover alerts. Download the Pushover app and create an account:. Enter your User Key so we have permission to send you push notifications:. User Key. Receive direct Phone Calls for alerts that require immediate attention. An automated recording will read your alert out loud when you answer.

Never miss an urgent event in crypto. Browser Notifications allow you to receive alerts right from your desktop — even if the tab is closed! Visit our FAQ for further details. A Webhook allows users to programmatically react to an alert. It's a way to automate, extend and combine our platform with other services. Visit our FAQ to learn more about webhooks, or check out the quick start guide.

Integrate your account with a Slack channel in seconds. Once logged in, simply click "Add to Slack", then select a workspace and channel. Link your account with our Telegram bot to receive customizable crypto alerts. Unlike most crypto bots, you create and manage alerts from our web interface. We support both individual users and telegram groups. Integrate your account with any Discord server. You'll just need to provide us with a specific Webhook URL to send you messages. Click here for a quick guide.

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Today, we will be talking about how to implement notifications in iOS The biggest change to notifications in iOS 10 is part of a framework called UserNotificationsUI , which lets us embed custom view controller in our notifications! In this tutorial, we will be covering various types of local notifications on iOS, starting with basic text notifications and working our way up to embedding an image and an action in our notification. Follow along for more and feel free to comment any questions you may have.

Not all of the notifications we want to show will be fancy and interactive. For this reason, we will start by demonstrating how to show a basic text notification. Download the starter project and open up NotificationsUI. Open up Main. It lets users pick a date and time for a notification reminder. Currently, picking a date and time does nothing.

When you open ViewController. There is only an action method named datePickerDidSelectNewDate that will be invoked when a new date is selected in the date picker. As mentioned before, right now, the app does nothing instead of creating a notification.

The process for creating a notification has changed slightly in iOS Developers must now create requests , which are requests to iOS to present a notification. These requests consist of 2 components: triggers and content. A trigger is a set of conditions that must be met for a notification to deliver.

To show a notification in iOS 10, we begin with a trigger. Apple provides a few others, such as UNLocationNotificationTrigger which triggers a notification when the user arrives a particular location. The first step to displaying a notification on iOS, as stated above, is creating a trigger. Go to AppDelegate. All the notification-related APIs are organized in this framework:. Next, add a function called scheduleNotification at date: Date.

As its name implies, this function will be responsible for scheduling a notification at a provided date. In the above code, we use the Gregorian calendar to separate a provided date into components. Dates and components are beyond the scope of this tutorial, but all you need to know is that a date consists of components. An individual component represents a piece of a date, such as the hour, minute, second, etc. The code we have written so far separates the date parameter into components and it saves these components in the components constant.

The reason we do this is that UNCalendarNotificationTrigger requires date components, not dates, to function. However, one other oddity of UNCalendarNotificationTrigger is that the complete set of components taken directly from a date do not seem to work. Instead, we need to construct our own instance of DateComponents using some information from the existing instance we have. The third line does just that: it creates a new instance of DateComponents using only the relevant information from date.

Like most other things in iOS, Apple has made this process pretty easy. Just add the following line of code in the function:. As you can probably infer, this line creates a new UNCalendarNotificationTrigger using the date components we extracted above. We have set repeats to false because we only want the notification to be appeared once. Now that we have created a trigger, the next thing is to create some content to display in our notification.

You can add the following lines of code to create the notification content. Simply put the code snippet right below the trigger variable:. These lines are pretty self explanatory: we create a new instance of UNMutableNotificationContent , and then set its title, body, and sound accordingly. However, there are still a couple of steps left: 1. To create a notification request, you instantiate a UNNotificationRequest object with the corresponding content and trigger. You also need to give it a unique identifier for identifying this notification request.

Insert the following line of code in the scheduleNotification function:. Okay, the last thing we have to do is add the request to the notification center that manages all notifications for your app. The notification center will listen to the appropriate event and trigger the notification accordingly. Before we add the notification request to the notification center, it is good to remove any existing notification requests. This step helps prevent unnecessary duplicate notifications.

Insert the following code snippet in the function:. The first line of code gets the shared instance of the notification center and calls the removeAllPendingNotificationRequests method to remove all pending notification requests. And then we add the request to the notification center.

The method also takes in a completion handler. In our implementation, we use this handler to print an error. Before we continue, make sure your scheduleNotification function looks something like this:. Download our app to start receiving push notifications directly on your iOS or Android device:. After downloading the app, simply log in with your existing account and grant us permission to send you push notifications.

We will soon be phasing out support for our Pushover alerts. Downloading our new app will migrate existing Pushover alerts. Download the Pushover app and create an account:. Enter your User Key so we have permission to send you push notifications:.

User Key. Receive direct Phone Calls for alerts that require immediate attention. An automated recording will read your alert out loud when you answer. Never miss an urgent event in crypto. Browser Notifications allow you to receive alerts right from your desktop — even if the tab is closed! Visit our FAQ for further details.

A Webhook allows users to programmatically react to an alert. It's a way to automate, extend and combine our platform with other services. Visit our FAQ to learn more about webhooks, or check out the quick start guide. Integrate your account with a Slack channel in seconds. Once logged in, simply click "Add to Slack", then select a workspace and channel.

Link your account with our Telegram bot to receive customizable crypto alerts. Unlike most crypto bots, you create and manage alerts from our web interface. We support both individual users and telegram groups. Integrate your account with any Discord server. You'll just need to provide us with a specific Webhook URL to send you messages.

Click here for a quick guide. Delete My Account Nevermind. Log In. Sign Up. My Alerts. Price Alert. Percentage Price Alert. Periodic Price Alert. Crypto MarketCap Alert. Volume Alert. Coin Listing Alert. Wallet Watch Alert. BTC Mempool Alert. BTC Dominance Alert. Blockchain Alert. Recent Exchange Listings. Trending Coins. Crypto Glossary. Altcoin Explainer. Learn about our app. Our Notification Methods. Affiliate Program. Developer API. Contact Us. My Account. General Settings. Notification Settings.

Yes, Delete Nevermind. Alert Created Success! Your alert has been saved. You still need to verify your phone number before you can receive SMS alerts. Verify Phone Your alert will become active once your Email has been verified. A confirmation email has been sent. You must enable Pushover Notifications before this alert can be received.

Configure You must enable Push Notifications before this alert can be received. Get the App In order to receive Phone Calls , you will need to verify your phone number. Verify Phone You must allow Browser Notifications before this alert can be received. Configure Webhook You must link a Slack Channel before this alert can be received.