Nel 2013 avevo fatto qualche esperimento con la lettura dei codici a barre tramite la libreria ZXing.
Ad oggi le funzioni di scansioni dei codici sono incluse nelle librerie di Google Play ma le trovo complicate mentre la libreria ZXing (https://github.com/zxing/zxing) e' in maintenance mode. Ho trovato una alternativa a questo link https://github.com/yuriy-budiyev/code-scanner
build.gradle(app)
implementation 'com.budiyev.android:code-scanner:2.1.0'
Layout
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<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.budiyev.android.codescanner.CodeScannerView
android:id="@+id/scanner_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:autoFocusButtonColor="@android:color/white"
app:autoFocusButtonVisible="true"
app:flashButtonColor="@android:color/white"
app:flashButtonVisible="true"
app:frameColor="@android:color/white"
app:frameCornersSize="50dp"
app:frameCornersRadius="0dp"
app:frameAspectRatioWidth="1"
app:frameAspectRatioHeight="1"
app:frameSize="0.75"
app:frameThickness="2dp"
app:maskColor="#77000000"/>
</FrameLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
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codice
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val scannerView = findViewById<CodeScannerView>(R.id.scanner_view)
codeScanner = CodeScanner(this, scannerView)
// Parameters (default values)
codeScanner.camera = CodeScanner.CAMERA_BACK // or CAMERA_FRONT or specific camera id
codeScanner.formats = CodeScanner.ALL_FORMATS // list of type BarcodeFormat,
// ex. listOf(BarcodeFormat.QR_CODE)
codeScanner.autoFocusMode = AutoFocusMode.SAFE // or CONTINUOUS
codeScanner.scanMode = ScanMode.SINGLE // or CONTINUOUS or PREVIEW
codeScanner.isAutoFocusEnabled = true // Whether to enable auto focus or not
codeScanner.isFlashEnabled = false // Whether to enable flash or not
// Callbacks
codeScanner.decodeCallback = DecodeCallback {
runOnUiThread {
Toast.makeText(this, "Scan result: ${it.text}", Toast.LENGTH_LONG).show()
}
}
codeScanner.errorCallback = ErrorCallback { // or ErrorCallback.SUPPRESS
runOnUiThread {
Toast.makeText(this, "Camera initialization error: ${it.message}",
Toast.LENGTH_LONG).show()
}
}
scannerView.setOnClickListener {
codeScanner.startPreview()
}
}
override fun onResume() {
super.onResume()
codeScanner.startPreview()
}
override fun onPause() {
codeScanner.releaseResources()
super.onPause()
}
