Smile, it’s CameraX! [analysis and extensions] | Analysis - Step 2: create a custom analyser

CameraXSample.kt

class PurpleColorAnalyser : ImageAnalysis.Analyzer {
      private var lastAnalyzedTimestamp = 0L

      private fun ByteBuffer.toByteArray(): ByteArray {
          rewind()
          val data = ByteArray(remaining())
          get(data)
          return data
      }

      override fun analyze(image: ImageProxy) {
          val currentTimestamp = System.currentTimeMillis()
          val oneSecond = TimeUnit.SECONDS.toMillis(1)
          if (currentTimestamp - lastAnalyzedTimestamp >= oneSecond) {
              val buffer = image.planes[0].buffer
              val data = buffer.toByteArray()
              val pixels = data.map { it.toInt() and 0x9370DB }
              val averagePurplePixels = pixels.average()
              Log.e("PURPLE", "Average purple pixels: $averagePurplePixels")
              lastAnalyzedTimestamp = currentTimestamp
          }
          image.close()
      }
  }