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Scanning codes for a long time can cause the phone to get hot and overheated #723

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@zrina1314

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@zrina1314

I have a question. Why not pass scanThrottleDelay to the native layer for processing? Perform throttling inside the analyze function of QRCodeAnalyzer. This can reduce the number of calls for identifying QR codes.

The problem I'm encountering now:
Scanning codes for a long time can cause the phone to get hot and overheated


import android.annotation.SuppressLint
import androidx.camera.core.ExperimentalGetImage
import androidx.camera.core.ImageAnalysis
import androidx.camera.core.ImageProxy
import com.google.mlkit.vision.barcode.BarcodeScanning
import com.google.mlkit.vision.barcode.common.Barcode
import com.google.mlkit.vision.common.InputImage
class QRCodeAnalyzer (
    private val scanThrottleDelay: Long, // --> Newly added code
    private val onQRCodesDetected: (qrCodes: List<Barcode>) -> Unit
) : ImageAnalysis.Analyzer {
    private var lastScanTime: Long = 0 // --> Newly added code

    @SuppressLint("UnsafeExperimentalUsageError")
    @ExperimentalGetImage
    override fun analyze(image: ImageProxy) {
        val currentTime = System.currentTimeMillis()    // --> Newly added code
        if (currentTime - lastScanTime < scanThrottleDelay) {   // --> Newly added code
            image.close()   // --> Newly added code
            return  // --> Newly added code
        }
        lastScanTime = currentTime

        val inputImage = InputImage.fromMediaImage(image.image!!, image.imageInfo.rotationDegrees)

        val scanner = BarcodeScanning.getClient()
        scanner.process(inputImage)
            .addOnSuccessListener { barcodes ->
                val strBarcodes = mutableListOf<Barcode>()
                barcodes.forEach { barcode ->
                    strBarcodes.add(barcode ?: return@forEach)
                }
                onQRCodesDetected(strBarcodes)
            }
            .addOnCompleteListener{
                image.close()
            }
    }
}```

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