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Cómo escanear un código QR Android (Tutorial para principiantes)

Jordi Bardia
Jordi Bardia
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QR codes are everywhere these days, serving as quick links to websites, discounts, or important information. However, the method to scan them isn't always the same across all Android devices. Depending on your phone model, you might be able to use your built-in camera app, or you might need a separate QR code scanner. To clear up any confusion, we've put together a detailed guide to help you scan QR codes effortlessly on any Android smartphone or tablet. We'll also explore a programmatic way to scan QR codes using the IronQR library.

Built-in Methods to Scan QR Codes on Android

Android devices often come equipped with native capabilities to support QR code scanning. These built-in methods offer convenience and security, as they don't require the installation of third-party applications. Let's examine the primary built-in options available to Android device users.

1. Google Lens App

Google Lens is a powerful visual analysis tool that includes QR code scanning capabilities. This application is often pre-installed on Android devices and can be accessed through various entry points.

Accessing Google Lens

Users can access Google Lens on their Android phone through several methods, depending on their device and preferences. The most common approach is via the Google App. Here are the steps to access Google Lens:

  1. Open the Google App.
  2. Locate the Google Lens icon near the search bar.

How to scan QR Code Android (Beginner Tutorial): Figure 1

  1. Tap the icon to activate Google Lens.

For those who prefer working with existing images, Google Photos offers another entry point. The process is as follows:

  1. Open Google Photos.

  2. Select an image containing a QR code.

How to scan QR Code Android (Beginner Tutorial): Figure 2

  1. Tap the Google Lens icon at the bottom of the screen. After that, you can use the Google Lens feature for QR code scanning.

Some Android devices, particularly those running more recent versions of the operating system, integrate Google Lens directly into the native camera application. Users of these devices can access Google Lens by:

  1. Launching the camera app.
  2. Looking for a "Modes" or "More" option.
  3. Selecting Google Lens if available.

Using Google Lens for QR Code Scanning

Once Google Lens is activated, the process of scanning a QR code is straightforward. Here's how to use it:

  1. Direct your device's camera towards the QR code.
  2. Wait for Google Lens to automatically initiate a scan.
  3. When a QR code is recognized, a pop-up will appear with the encoded information.
  4. Tap the pop-up to proceed to the linked content or perform the associated action.

2. Quick Settings Tile

Some Android devices provide a Quick Settings tile for QR code scanning, offering rapid access to this functionality. To set up and use this feature:

  1. Access the Quick Settings panel by swiping down from the top of the screen.

How to scan QR Code Android (Beginner Tutorial): Figure 3

  1. Expand the full panel with a second downward swipe.

How to scan QR Code Android (Beginner Tutorial): Figure 4

  1. Locate the edit function, often represented by a pencil icon or three-dot icons.

How to scan QR Code Android (Beginner Tutorial): Figure 5

  1. In edit mode, search for a tile labeled "QR code" or "QR Scanner."

How to scan QR Code Android (Beginner Tutorial): Figure 6

  1. Drag this tile into the active Quick Settings area.
  2. Save the changes to confirm the new layout.

To utilize the Quick Settings QR code scanner:

  1. Open the Quick Settings panel.
  2. Tap the QR code scanner tile.
  3. The device will launch a QR code scanning interface, which may utilize the camera app or Google Lens.
  4. Point the camera at the QR code to initiate the scan.

These built-in methods offer Android users efficient ways to scan QR codes without the need for additional software installation. Users can quickly access the information encoded in QR codes while maintaining the security and integrity of their devices. Other than this, you can download a third-party app for QR code scanning on Android phones using the Google Play Store.

Introducing the IronQR .NET Library

While the built-in methods we've discussed provide excellent QR code scanning capabilities for end-users, developers often require more robust tools for creating and manipulating QR codes within their applications. This is where the IronQR .NET library comes into play. It offers a powerful solution for QR code functionality in Android app development.

Overview of IronQR

How to scan QR Code Android (Beginner Tutorial): Figure 7

IronQR is a comprehensive .NET library designed for generating, reading QR codes, and manipulating QR codes. Although primarily targeted at .NET developers, it can be utilized in Android development through frameworks like Xamarin or .NET MAUI. It is a perfect choice for cross-platform applications with QR functionalities.

Key Features and Benefits

IronQR offers many features regarding QR code functionality:

  1. QR Code Generation: Developers can create QR codes programmatically, controlling various parameters such as size, error correction level, and content.
  2. Advanced Scanning Capabilities: The library provides robust algorithms for reading QR codes, even in challenging conditions or from images.
  3. Customization Options: IronQR allows for the creation of customized QR codes, including the addition of logos or custom colors, while maintaining scannability.
  4. Support for Various Data Types: The library can encode different types of data, including URLs, contact information, and custom text, into QR codes.
  5. Error Handling and Correction: IronQR implements advanced error correction techniques, ensuring that generated QR codes are reliable and easily scannable.

Integration with Android Development

For Android developers working in a .NET environment, IronQR can be integrated into projects to provide server-side QR code generation or to enhance the capabilities of Android applications. This integration allows for more complex QR code operations that may not be possible with standard Android libraries.

Developers can create Android applications with sophisticated QR code functionalities, such as batch QR code generation, advanced decoding features, or custom QR code designs that align with branding requirements. The IronQR .NET library serves as a powerful tool for developers looking to extend the QR code capabilities of their Android applications beyond the standard built-in features.

Code Example

Here is a demonstration of a .NET MAUI QR Code Scanner App using IronQR. After installing the IronQR library in the project, update the MauiPage.xaml code:

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="QR_Code_Business_Card.MainPage"
             Title="QR Code Reader">
    <Grid Padding="20" RowDefinitions="Auto,*" ColumnDefinitions="*,Auto,*">
        <!-- Left side -->
        <VerticalStackLayout Grid.Row="1" Grid.Column="0" Spacing="20">
            <Button x:Name="ScanQRButton" 
                    Text="Scan QR Code"
                    Clicked="OnScanQRButtonClicked"
                    HorizontalOptions="Fill"
                    BackgroundColor="#6200EE"
                    TextColor="White"
                    FontAttributes="Bold"
                    CornerRadius="10" />
            <Frame BorderColor="#E0E0E0" Padding="0" CornerRadius="10" HasShadow="True">
                <Grid>
                    <Image x:Name="SelectedImage"
                           HeightRequest="300"
                           WidthRequest="300"
                           Aspect="AspectFit" />
                    <ActivityIndicator x:Name="LoadingIndicator"
                                       IsRunning="False"
                                       IsVisible="False"
                                       Color="#6200EE"
                                       VerticalOptions="Center"
                                       HorizontalOptions="Center" />
                </Grid>
            </Frame>
        </VerticalStackLayout>
        <!-- Divider -->
        <BoxView Grid.Row="0" Grid.RowSpan="2" Grid.Column="1" 
                 WidthRequest="1" 
                 Color="#E0E0E0" 
                 Margin="10,0" />
        <!-- Right side -->
        <VerticalStackLayout Grid.Row="1" Grid.Column="2" Spacing="20">
            <Frame BorderColor="#E0E0E0" Padding="10" CornerRadius="10" HasShadow="True">
                <Editor x:Name="ResultEditor"
                        HeightRequest="200"
                        IsReadOnly="True"
                        Placeholder="QR code content will appear here"
                        FontSize="16" />
            </Frame>
            <Button x:Name="CopyTextButton" 
                    Text="Copy Text"
                    Clicked="OnCopyTextButtonClicked"
                    HorizontalOptions="Fill"
                    BackgroundColor="#6200EE"
                    TextColor="White"
                    FontAttributes="Bold"
                    CornerRadius="10" />
        </VerticalStackLayout>
    </Grid>
</ContentPage>
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="QR_Code_Business_Card.MainPage"
             Title="QR Code Reader">
    <Grid Padding="20" RowDefinitions="Auto,*" ColumnDefinitions="*,Auto,*">
        <!-- Left side -->
        <VerticalStackLayout Grid.Row="1" Grid.Column="0" Spacing="20">
            <Button x:Name="ScanQRButton" 
                    Text="Scan QR Code"
                    Clicked="OnScanQRButtonClicked"
                    HorizontalOptions="Fill"
                    BackgroundColor="#6200EE"
                    TextColor="White"
                    FontAttributes="Bold"
                    CornerRadius="10" />
            <Frame BorderColor="#E0E0E0" Padding="0" CornerRadius="10" HasShadow="True">
                <Grid>
                    <Image x:Name="SelectedImage"
                           HeightRequest="300"
                           WidthRequest="300"
                           Aspect="AspectFit" />
                    <ActivityIndicator x:Name="LoadingIndicator"
                                       IsRunning="False"
                                       IsVisible="False"
                                       Color="#6200EE"
                                       VerticalOptions="Center"
                                       HorizontalOptions="Center" />
                </Grid>
            </Frame>
        </VerticalStackLayout>
        <!-- Divider -->
        <BoxView Grid.Row="0" Grid.RowSpan="2" Grid.Column="1" 
                 WidthRequest="1" 
                 Color="#E0E0E0" 
                 Margin="10,0" />
        <!-- Right side -->
        <VerticalStackLayout Grid.Row="1" Grid.Column="2" Spacing="20">
            <Frame BorderColor="#E0E0E0" Padding="10" CornerRadius="10" HasShadow="True">
                <Editor x:Name="ResultEditor"
                        HeightRequest="200"
                        IsReadOnly="True"
                        Placeholder="QR code content will appear here"
                        FontSize="16" />
            </Frame>
            <Button x:Name="CopyTextButton" 
                    Text="Copy Text"
                    Clicked="OnCopyTextButtonClicked"
                    HorizontalOptions="Fill"
                    BackgroundColor="#6200EE"
                    TextColor="White"
                    FontAttributes="Bold"
                    CornerRadius="10" />
        </VerticalStackLayout>
    </Grid>
</ContentPage>
XML

After that, update the MauiPage.xaml.cs code:

using IronQr;
using IronSoftware.Drawing;
namespace QR_Code_Business_Card
{
    public partial class MainPage : ContentPage
    {
        public MainPage()
        {
            InitializeComponent();
            License.LicenseKey = "License-Key";
        }

        private async void OnScanQRButtonClicked(object sender, EventArgs e)
        {
            try
            {
                var result = await FilePicker.PickAsync(new PickOptions
                {
                    FileTypes = FilePickerFileType.Images,
                    PickerTitle = "Pick an image with a QR code"
                });

                if (result != null)
                {
                    string filePath = result.FullPath;
                    SelectedImage.Source = ImageSource.FromFile(filePath);

                    // Show loading indicator
                    LoadingIndicator.IsVisible = true;
                    LoadingIndicator.IsRunning = true;
                    ResultEditor.Text = "Processing QR code...";

                    // Process QR code in the background
                    await Task.Run(() =>
                    {
                        var inputBmp = AnyBitmap.FromFile(filePath);
                        QrImageInput imageInput = new QrImageInput(inputBmp);
                        QrReader reader = new QrReader();
                        IEnumerable<QrResult> results = reader.Read(imageInput);

                        MainThread.BeginInvokeOnMainThread(() =>
                        {
                            if (results.Any())
                            {
                                string scannedData = results.First().Value.ToString();
                                ResultEditor.Text = scannedData;
                            }
                            else
                            {
                                ResultEditor.Text = "No QR code found in the image.";
                            }

                            // Hide loading indicator
                            LoadingIndicator.IsVisible = false;
                            LoadingIndicator.IsRunning = false;
                        });
                    });
                }
            }
            catch (Exception ex)
            {
                ResultEditor.Text = $"An error occurred: {ex.Message}";
                LoadingIndicator.IsVisible = false;
                LoadingIndicator.IsRunning = false;
            }
        }

        private async void OnCopyTextButtonClicked(object sender, EventArgs e)
        {
            if (!string.IsNullOrWhiteSpace(ResultEditor.Text))
            {
                await Clipboard.SetTextAsync(ResultEditor.Text);
                await DisplayAlert("Success", "Text copied to clipboard", "OK");
            }
            else
            {
                await DisplayAlert("Error", "No text to copy", "OK");
            }
        }
    }
}
using IronQr;
using IronSoftware.Drawing;
namespace QR_Code_Business_Card
{
    public partial class MainPage : ContentPage
    {
        public MainPage()
        {
            InitializeComponent();
            License.LicenseKey = "License-Key";
        }

        private async void OnScanQRButtonClicked(object sender, EventArgs e)
        {
            try
            {
                var result = await FilePicker.PickAsync(new PickOptions
                {
                    FileTypes = FilePickerFileType.Images,
                    PickerTitle = "Pick an image with a QR code"
                });

                if (result != null)
                {
                    string filePath = result.FullPath;
                    SelectedImage.Source = ImageSource.FromFile(filePath);

                    // Show loading indicator
                    LoadingIndicator.IsVisible = true;
                    LoadingIndicator.IsRunning = true;
                    ResultEditor.Text = "Processing QR code...";

                    // Process QR code in the background
                    await Task.Run(() =>
                    {
                        var inputBmp = AnyBitmap.FromFile(filePath);
                        QrImageInput imageInput = new QrImageInput(inputBmp);
                        QrReader reader = new QrReader();
                        IEnumerable<QrResult> results = reader.Read(imageInput);

                        MainThread.BeginInvokeOnMainThread(() =>
                        {
                            if (results.Any())
                            {
                                string scannedData = results.First().Value.ToString();
                                ResultEditor.Text = scannedData;
                            }
                            else
                            {
                                ResultEditor.Text = "No QR code found in the image.";
                            }

                            // Hide loading indicator
                            LoadingIndicator.IsVisible = false;
                            LoadingIndicator.IsRunning = false;
                        });
                    });
                }
            }
            catch (Exception ex)
            {
                ResultEditor.Text = $"An error occurred: {ex.Message}";
                LoadingIndicator.IsVisible = false;
                LoadingIndicator.IsRunning = false;
            }
        }

        private async void OnCopyTextButtonClicked(object sender, EventArgs e)
        {
            if (!string.IsNullOrWhiteSpace(ResultEditor.Text))
            {
                await Clipboard.SetTextAsync(ResultEditor.Text);
                await DisplayAlert("Success", "Text copied to clipboard", "OK");
            }
            else
            {
                await DisplayAlert("Error", "No text to copy", "OK");
            }
        }
    }
}
Imports IronQr
Imports IronSoftware.Drawing
Namespace QR_Code_Business_Card
	Partial Public Class MainPage
		Inherits ContentPage

		Public Sub New()
			InitializeComponent()
			License.LicenseKey = "License-Key"
		End Sub

		Private Async Sub OnScanQRButtonClicked(ByVal sender As Object, ByVal e As EventArgs)
			Try
				Dim result = Await FilePicker.PickAsync(New PickOptions With {
					.FileTypes = FilePickerFileType.Images,
					.PickerTitle = "Pick an image with a QR code"
				})

				If result IsNot Nothing Then
					Dim filePath As String = result.FullPath
					SelectedImage.Source = ImageSource.FromFile(filePath)

					' Show loading indicator
					LoadingIndicator.IsVisible = True
					LoadingIndicator.IsRunning = True
					ResultEditor.Text = "Processing QR code..."

					' Process QR code in the background
					Await Task.Run(Sub()
						Dim inputBmp = AnyBitmap.FromFile(filePath)
						Dim imageInput As New QrImageInput(inputBmp)
						Dim reader As New QrReader()
						Dim results As IEnumerable(Of QrResult) = reader.Read(imageInput)

						MainThread.BeginInvokeOnMainThread(Sub()
							If results.Any() Then
								Dim scannedData As String = results.First().Value.ToString()
								ResultEditor.Text = scannedData
							Else
								ResultEditor.Text = "No QR code found in the image."
							End If

							' Hide loading indicator
							LoadingIndicator.IsVisible = False
							LoadingIndicator.IsRunning = False
						End Sub)
					End Sub)
				End If
			Catch ex As Exception
				ResultEditor.Text = $"An error occurred: {ex.Message}"
				LoadingIndicator.IsVisible = False
				LoadingIndicator.IsRunning = False
			End Try
		End Sub

		Private Async Sub OnCopyTextButtonClicked(ByVal sender As Object, ByVal e As EventArgs)
			If Not String.IsNullOrWhiteSpace(ResultEditor.Text) Then
				Await Clipboard.SetTextAsync(ResultEditor.Text)
				Await DisplayAlert("Success", "Text copied to clipboard", "OK")
			Else
				Await DisplayAlert("Error", "No text to copy", "OK")
			End If
		End Sub
	End Class
End Namespace
$vbLabelText   $csharpLabel

After running the application, you'll see the following UI. After selecting the QR code, it'll scan the QR code and show the result text in the text box, which you can copy using the copy button.

How to scan QR Code Android (Beginner Tutorial): Figure 8

Conclusion

How to scan QR Code Android (Beginner Tutorial): Figure 9

Scanning QR codes on Android devices is made easy with built-in features like Google Lens and Quick Settings tiles. These native methods provide users with quick and secure access to QR code information without the need for additional apps.

For developers aiming to incorporate advanced QR code functionalities into their applications, the IronQR .NET library offers a powerful solution. It enables custom QR code generation, advanced scanning capabilities, and extensive customization options. IronQR offers a free trial for developers to explore its features, with licenses starting from $799, making it a worthwhile investment for professional-grade QR code integration in Android applications.

Preguntas Frecuentes

¿Cómo puedo escanear códigos QR usando la cámara integrada en mi dispositivo Android?

A menudo puedes escanear códigos QR usando la aplicación de cámara integrada si se integra con Google Lens. Abre la cámara, apúntala al código QR, y si es compatible, la cámara mostrará un enlace o acción asociada con el código QR.

¿Qué es Google Lens y cómo se utiliza para escanear códigos QR en Android?

Google Lens es una herramienta de búsqueda visual que incluye capacidades de escaneo de códigos QR. Se puede acceder desde la aplicación de Google o Google Fotos en tu dispositivo Android. Para escanear un código QR, abre Google Lens, apúntalo al código QR y te proporcionará información o un enlace relacionado con el código.

¿Cómo agrego un escáner de códigos QR a mi Configuración Rápida en Android?

Para agregar un escáner de códigos QR a tu Configuración Rápida, desliza hacia abajo desde la parte superior de tu dispositivo Android para abrir Configuración Rápida, toca 'Editar' o el ícono de lápiz, y arrastra el azulejo del escáner QR al área activa para un acceso rápido.

¿Necesito aplicaciones de terceros para escanear códigos QR en Android?

No necesariamente. Muchos dispositivos Android tienen capacidades integradas de escaneo de códigos QR a través de Google Lens o azulejos de Configuración Rápida. Sin embargo, si tu dispositivo no admite estas funciones, es posible que necesites una aplicación de terceros.

¿Qué biblioteca pueden usar los desarrolladores para agregar capacidades de códigos QR en sus aplicaciones?

Los desarrolladores pueden usar la biblioteca IronQR .NET para agregar capacidades de generación, lectura y manipulación de códigos QR en sus aplicaciones, permitiendo funcionalidades avanzadas de QR.

¿Se puede usar IronQR para el desarrollo de aplicaciones Android?

Sí, IronQR puede integrarse en el desarrollo de aplicaciones Android a través de frameworks como Xamarin o .NET MAUI, proporcionando funcionalidades avanzadas de códigos QR como generación y escaneo.

¿Qué características ofrece la biblioteca IronQR para los desarrolladores?

IronQR ofrece características como generación de códigos QR, capacidades de escaneo avanzadas, opciones de personalización, corrección de errores y soporte para codificar varios tipos de datos.

¿Cómo pueden los desarrolladores integrar IronQR en sus proyectos Android?

Los desarrolladores pueden integrar IronQR en proyectos Android utilizando frameworks .NET como Xamarin o .NET MAUI, habilitando la generación de códigos QR del lado del servidor o mejorando las capacidades de la aplicación con funcionalidades avanzadas de QR.

¿Hay disponible una versión de prueba para IronQR?

Sí, IronQR ofrece una prueba gratuita para que los desarrolladores exploren sus características antes de comprar una licencia para uso profesional.

Jordi Bardia
Jordi Bardia
  Chatea con el equipo de ingeniería ahora
Ingeniero de Software
Jordi es más competente en Python, C# y C++. Cuando no está aprovechando sus habilidades en Iron Software, está programando juegos. Compartiendo responsabilidades para pruebas de productos, desarrollo de productos e investigación, Jordi agrega un valor inmenso a la mejora continua del producto. La experiencia variada lo mantiene ...
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