设置imageAnalysis.setAnalyzer()时发生编译错误 [英] Compile error while setting imageAnalysis.setAnalyzer()

问题描述

我正在创建一个工具，用于使用cameraX从预览中捕获每一帧(用于面部识别)

I'm creating a tool to capture every frame from preview using cameraX (for face recognition purpose)

我发现使用ImageAnalysis是必经之路.

I found that using ImageAnalysis was the way to go.

直到我尝试按照推荐的方式使用代码:

Until I tried using the code as recommended :

val imageAnalysisConfig = ImageAnalysisConfig.Builder()
            .setTargetResolution(Size(1280, 720))
            .setImageReaderMode(ImageAnalysis.ImageReaderMode.ACQUIRE_LATEST_IMAGE)
            .build()
        val imageAnalysis = ImageAnalysis(imageAnalysisConfig)

        imageAnalysis.setAnalyzer({ image: ImageProxy, rotationDegrees: Int ->
            viewModel.onAnalyzeImage(image)
        })

我在setAnalyser方法上收到以下编译错误:

To which I get the following compile error on setAnalyser method :

None of the following function can be called with the arguments supplied
setAnalyser((command : Runnable!) -> Unit,  (image: ImageProxy!, rotationDegrees: Int) -> Unit)

推荐答案

我今天也面临着相同的问题，因此，发现有一个缺少的参数是Executor，我们需要传递该参数，否则会出现相同的编译错误

I was also facing the same issue today, so , found that there is one missing parameter which is Executor which we need to pass otherwise same compilation error comes.

就像我过去使用AsyncTasks一样，我认识到要在AsyncTasks中的多个线程中执行任务，我们需要使用其静态方法executeOnExecutor()，该方法将Executor作为其参数，因此我使用了相同的参数，即在setAnalyser()方法中将AsyncTask.THREAD_POOL_EXECUTOR用作第一个参数.它就像一个魅力！将其作为第一个参数后，您需要在先前的代码中进行一些小的更改.

As as I worked with AsyncTasks in my past, I recognized that for doing tasks in multiple threads in AsyncTasks, we need to use its static method executeOnExecutor() which takes an Executor as its parameter, so I used the same parameter i.e. I used AsyncTask.THREAD_POOL_EXECUTOR as first parameter in setAnalyser() method. And it worked like a charm!! After putting this as first parameter you need to perform some minor changes in your previous code.

 imageAnalysis.setAnalyzer(AsyncTask.THREAD_POOL_EXECUTOR,
 object : ImageAnalysis.Analyzer {    // changes to be done in this line
                    override fun analyze(imageProxy: ImageProxy, rotationDegrees: Int) {
                        val image = FirebaseVisionImage.fromMediaImage(
                                imageProxy.image!!, getFirebaseRotation(rotationDegrees)
                        )
        
                        if (processingBarcode.get() ||
                                !lifecycle.currentState.isAtLeast(Lifecycle.State.RESUMED)) {
                            return
                        }
    ..................
    .............
    .......BLA BLA BLA
    }

尝试一下，并告诉我这种方法是否适用于您的用例.

Try it and tell me if this approach works with your use case.

如果您不喜欢AsyncTask，那么我找到了一种无需使用AsyncTask.THREAD_POOL_EXECUTOR即可获取Executor实例的替代方法.

If you don't like AsyncTask, then I have found an alternative for getting an Executor instance without using AsyncTask.THREAD_POOL_EXECUTOR.

您可以使用Executors.newFixedThreadPool(n)来获取Executor实例. 在这里，n代表您要在线程池中创建的线程数.它随您的用例而变化.

You can use Executors.newFixedThreadPool(n), to get an Executor instance. Here, n stands for the number of threads you want to create in the thread pool.It varies depending upon your use-case.

告诉我它是否对您有用.

Tell me if it worked for you.

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