ml-kit

allprojects {
    repositories {
        ...
        google { url 'https://maven.aliyun.com/repository/google' }
    }
}

dependencies {
    // Barcode model
    api 'com.google.mlkit:barcode-scanning:17.0.0'
}

import android.graphics.Bitmap
import android.util.Log
import com.google.mlkit.vision.barcode.Barcode
import com.google.mlkit.vision.barcode.BarcodeScanner
import com.google.mlkit.vision.barcode.BarcodeScanning
import com.google.mlkit.vision.common.InputImage
import java.util.concurrent.Executors

class BarcodeScannerProcessor {

    private val barcodeScanner: BarcodeScanner = BarcodeScanning.getClient()
    private val executor = Executors.newSingleThreadExecutor()

    fun stop() {
        barcodeScanner.close()
        executor.shutdown()
    }

    fun processBitmap(bitmap: Bitmap, onNext: (barcode: Barcode?) -> Unit) {
        val image = InputImage.fromBitmap(bitmap, 0)
        barcodeScanner.process(image).continueWith(executor) {
            val barcodes = it.result
            if (barcodes.isEmpty()) {
                Log.v("BarcodeScanner", "No barcode has been detected")
            }
            onNext(barcodes.firstOrNull())
        }
    }
}

private final BarcodeScannerProcessor processor = new BarcodeScannerProcessor();

public void decodeByMlkit(Bitmap bitmap) {
  processor.processBitmap(bitmap, (barcode) -> {
      if (barcode != null) {
        // String text = barcode.getRawValue()
        // byte[] bytes = barcode.getRawBytes()
      }
      return null;
  });
}

public void onScanDone() {
  processor.stop();
}