QrX: Camera with ML Kit QR/Barcode detection

Mateusz Lutecki

Last update: Apr 7, 2022

Related tags

QRCode android kotlin camera qrcode kotlin-android android-library android-ui barcode-reader qrcode-scanner barcode-scanner camerax camerax-library mlkit-android

Overview

QrX: Camera with ML Kit QR/Barcode detection

This library allows you to easily add CameraX Preview with attached ML Kit to detect and display Qr codes and Barcodes. It provides QrXScanner layout component with all underlying logic attached.

Binaries

allprojects {
    repositories {
        maven(url = uri("https://jitpack.io"))
    }
}

dependencies{
    implementation("com.github.Luteoos:qrx:1.0.1")
}

For snapshots and non-released version see guide on Jitpack.io

⚠️ Warning

Becasue QrX exposes via listener com.google.mlkit.vision.barcode.common.Barcode I've decided to import Google ML Kit as an api dependency. Be aware of this as it might cause problems if you use this dependency on its own in your project.

    api("com.google.mlkit:barcode-scanning:17.0.2")

Build

$ git clone https://github.com/Luteoos/qrx.git
$ cd qrx/
$ ./gradlew build

Quick start

<layout>


<io.github.luteoos.qrx.QrXScanner
            android:id="@+id/qrxPreview"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            />
            

layout>

private val permissionRequestCamera = registerForActivityResult(ActivityResultContracts.RequestPermission()) {
        binding.cameraBarcode.onPermission(it)

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        binding.qrxPreview.initialize(
            this, 
            {   // onBarcodeClickListener
            },{ //onPermissionRetryListener
            })
        permissionRequestCamera.launch(Manifest.permission.CAMERA)
}

There is possibility to set listener on every detection result:

    binding.qrxPreview.onBarcodeScannedListener = {
        // List
    }

It will be invoked every ImageAnalysis.Analyzer cycle, no user interaction required

Customization

Resources

ID	Type	Description
qrx_permission_denied_info_text	String	Text requesting user to allow access to camera
qrx_permission_denied_button_text	String	Text displayed on request permission button
qrx_analysis_list_buffer	Integer	Buffer size for list holding detection results, each refresh first result with most detected `QR/Barcodes` will be used to draw UI
qrx_analysis_ui_refresh_delay	Integer (ms)	Determines `ms` between each UI redraw, implemented due to severe performance and usability difference between different classes of hardware
qrx_spacer	Dimen (dp)	Spacer used in layout
qrx_big_spacer	Dimen (dp)	Spacer used in layout
colorAccent	Color	`#8883D2`
colorAccentLight	Color	`#bab3ff`
colorBackground	Color	`#212121`
colorBackgroundTransparent	Color	`#F0212121`

View components

In runtime you can access and modify View components via

    binding.qrxPreview.findViewWithTag<TYPE>(QrXScanner.COMPONENT_TAG)

COMPONENT_TAG	TYPE
CAMERA_PREVIEW	androidx.camera.view.PreviewView
CAMERA_OVERLAY	ImageView
CAMERA_TORCH_BUTTON	ToggleButton
PERMISSION_DENIED_LAYOUT	LinearLayout
PERMISSION_DENIED_TEXT	TextView
PERMISSION_DENIED_BUTTON	Button

License

MIT License

Copyright (c) 2022 Mateusz Lutecki

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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