Budget smartphone owners often face the need to quickly read information from a two-dimensional barcode, whether it’s in-store payment, connecting to Wi-Fi or installing an app. Xiaomi’s Redmi 7A is based on a MIUI shell that has its own interface and settings. Understanding exactly where to look for a scan feature can save you time and nerves, especially if standard methods don’t work the first time.
In this article, we will take a closer look at all the code reading options available on your device, and we will look at both the built-in features of the system and third-party solutions that are guaranteed to work on the Snapdragon 439 architecture, and you will learn why the camera may not see the tag, and how to fix this situation without installing extra software.
Modern data-sharing technologies make interaction with the outside world as easy as possible, but sometimes hidden manufacturer settings can confuse the user. Two-dimensional barcodes have become a standard in many areas of life, so it is important to be able to work with them on any device, even if it is not in the flagship segment.
Use of the built-in Camera application
The most obvious and quick way is to use a standard photo application. In recent versions of MIUI, pattern recognition algorithms are built directly into the viewfinder. You don't have to look for a separate button, just point the lens at the object. However, on the Redmi 7A model, this feature can be disabled by default or require activation in the settings.
To activate this option, open the Camera app and find the icon with three horizontal bars in the upper right corner of the screen. In the menu that opens, you must select Settings or Scanner Settings. This is where the switch for recognition is hidden. QR-If it's off, the camera will run normally, ignoring digital tags.
⚠️ Note: Some global versions of the firmware MIUI The viewfinder scan feature can be removed or replaced with Google Lens, in which case the system will prompt you to use Google’s artificial intelligence to analyze the image.
Once you turn on the function, just point the camera at the code. If the distance and lighting are correctly matched, a yellow frame will appear on the screen, and a notification with the content will pop up in a second. This can be a link to the site, text or authorization data. Automatic recognition greatly speeds up the process, eliminating the need to take a picture and save it in the gallery.
Application Scanner in MIUI system
Xiaomi has developed a separate system utility called the Scanner, which is a more functional analogue of a simple camera and is designed specifically for working with different types of barcodes, and can be found in the Tools folder on the desktop or through a global application search.
When you run the scanner, you'll see an interface that's optimized for quick reads. Unlike a regular camera, there's no extra controls like a flash or a timer that allows you to focus on the target. The app automatically detects the type of encrypted information and suggests the appropriate action: open a link, add a contact or copy text.
- 📱 Universality: Supports reading QR-codes, barcodes of goods, documents and business cards.
- ⚡ Speed: Start-up is instantaneous, and focusing on the tag takes a fraction of a second even in low light.
- 🔍 Additional features: Includes text translation mode and product recognition in stores.
Importantly, for some advanced features, such as searching for goods or translating, the device will need Internet access. Basic reading of links and text works offline. If the application requests permission to use the camera or geolocation, it must be provided for proper operation.
☑️ Checking the scanner settings
Scanning through the browser and Google lens
If the standard tools of the system for some reason do not work or were removed by the user, browsers come to the rescue. Most modern browsers, such as Google Chrome, Yandex Browser or UC Browser, have a built-in image search function. In the mobile version of Chrome, this feature is implemented through Google Lens.
To scan through the browser, click on the camera icon in the address bar or in the Google search widget on your desktop. Once you open the lens interface, point the camera at the code. The system will analyze the image and give you a search result. This method is especially useful if the code is corrupted or printed against a complex background, since Google algorithms often do better than standard ones.
In addition, many browsers allow you to download an image of the code from the gallery. QR-With the code you want to read, just select the photo upload option in the lens interface, which eliminates the need to forward the file or open it in another application. Integration with the search engine allows you to instantly click on links or find product information.
| Method | Speed of operation | Demands the Internet. | precision |
|---|---|---|---|
| Appendix Camera | Tall. | No (for link opening - yes) | Medium |
| System scanner | Very high. | Partially. | Tall. |
| Google lens | Medium | Yes. | Maximum |
Using messengers to read codes
Popular messengers have also become a powerful tool for working with two-dimensional codes. In WhatsApp, Telegram and Viber, this feature is built deep into the interface. For example, in Telegram, the scanner is located right in the chat text input field (right of the input bar) or in the Settings menu, which is convenient when you need to quickly scan a friend's code for adding to contacts.
WhatsApp has a scanner at the top of the chat list, next to the new message creation button, designed primarily to quickly add contacts or connect to Wi-Fi, but can also open regular links, and the advantage of using instant messengers is that they are already running for most users all the time, which speeds up access to the feature.
However, privacy is a concern, and when scanning via messenger, data can be processed by the application servers, and it is safer to use isolated scanners or incognit browsers to check for unknown codes that may lead to suspicious sites.
Is it safe to scan codes from unknown sources?
Third-party apps from Google Play
When Redmi 7A’s built-in tools don’t meet your needs, Google Play offers thousands of alternatives, and third-party developers create applications with advanced features: scan history, custom code creation, batch scanning, and no ads.
One of the most popular and reliable solutions is Gamma Play’s QR & Barcode Scanner or Kaspersky QR Scanner, which are lightweight, fast on low-end processors and don’t require unnecessary resolutions, and are ideal for devices with limited RAM because they don’t overload the system with background processes.
- 📜 History: Save all scanned codes with sorting and search capability.
- 🎨 Creation: Generating your own QR-Wi-Fi codes, contacts or links.
- 🛡️ Security: Checking links to viruses before switching (in antivirus scanners).
When installing third-party software, pay attention to the permissions requested. The scanner does not need access to your contacts, microphone or location unless you initiate an action that requires this data. Excess rights are a sure sign of an unscrupulous developer.
Removal: Why the camera can't see the code
Sometimes users are faced with a situation where the Redmi 7A camera simply does not respond to the code. Most often the problem lies in the contamination of the lens. Wipe the camera with a soft cloth, as fat spots can distort the image, making it impossible to recognize the small details of the matrix.
The second common cause is poor lighting or glare. Laser autofocus on budget models can be wrong with bright light falling at an angle on the glossy surface of the code. Try changing the angle of the smartphone or moving to a place with softer, diffuse light. Image sharpness is a key success factor.
⚠️ Warning: If the code is glued to a curved surface or badly dented, a standard camera may not be able to handle it. In such cases, use Macro mode (if any) or a third-party application with manual focus settings.
Also check if the lens is covered with a case. Some protective cases have thick bezels that overlap part of the matrix, which is critical for wide-angle cameras used for scanning. Take off the case and try again.
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Tip: If the code is very small, try taking a photo of it and then opening the image in the Google Photos app. Press the Search button and the system recognizes the code right in the picture.
Creating your own QR-codes on Redmi 7A
Your smartphone can not only read, but also generate codes, which is a useful feature if you want to quickly transfer a link to your social media profile, contact or site address to another person, using online generators or special applications.
In the system MIUI Often there is a built-in code creation feature for Wi-Fi. Go to the Wi-Fi settings, click on your network name, and the system will prompt you to share access via the Wi-Fi settings. QR-Guests will only have to point the camera to connect without entering a password, and this is one of the most convenient ways to use the technology in the home.
To create more complex codes, use generator applications, you can encode text, email, or even an event in a calendar, and it takes seconds to generate codes, and you can save the result as an image and send it to the messenger or print it out.
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Smartphone Xiaomi Redmi 7A It has a complete set of tools to work with QR-codes: from simple reading by the camera to creating your own tags for data exchange.