标签: android-camerax

我尝试使用以下代码缩放相机CameraX。

首先，我得到一个Preview来自并尝试使用如下所示CameraX执行缩放。Preview

var config = CameraX.getDefaultUseCaseConfig(PreviewConfig::class.java, lensFacing)\nvar preview = Preview(config)\npreview.zoom(zoom)\n

preview.zoom()在我再次绑定并收到一些错误之后CameraX，它不起作用。

CameraX.bindToLifecycle(this, preview, imageCapture, videoCapture)\n

当上面的代码不起作用时，我CameraX.unbindAll()首先尝试使用，然后调用CameraX.bindToLifecycle(). 但再次遇到一些错误并且缩放没有成功。

让我知道如何使用 API 缩放相机CameraX。

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更新错误日志如下：

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仅使用错误日志CameraX.bindToLifecycle()：

java.lang.IllegalArgumentException: Exceeded max simultaneously bound image capture use cases.\n   at androidx.camera.camera2.impl.UseCaseSurfaceOccupancyManager.checkUseCaseLimitNotExceeded(UseCaseSurfaceOccupancyManager.java:61)\n   at androidx.camera.camera2.impl.Camera2DeviceSurfaceManager.getSuggestedResolutions(Camera2DeviceSurfaceManager.java:146)\n   at androidx.camera.core.CameraX.calculateSuggestedResolutions(CameraX.java:449)\n   at androidx.camera.core.CameraX.bindToLifecycle(CameraX.java:144)\n   at com.android.example.cameraxbasic.fragments.CameraFragment$updateCameraUi$2.onTouch(CameraFragment.kt:408)\n   at android.view.View.dispatchTouchEvent(View.java:12512)\n   at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3032)\n   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2719)\n   at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3032)\n   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2719)\n …

我正在尝试像在 Camera2 API 中一样对 CameraX 进行手动对焦

在 Camera2 API 中，我使用以下代码

final CaptureRequest.Builder captureBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE); 

captureBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_OFF); 

captureBuilder.set(CaptureRequest.LENS_FOCUS_DISTANCE, mLensFocusDistance);

android camera X 可以手动对焦吗？如果是这样如何

提前致谢

目前 Compose 中没有等效于 CameraView（和 PreviewView）的东西。是否可以将其包装并以组合布局显示？

我正在学习 CameraX，CameraXBasic是示例代码。

我写了一个基于zoomX函数的CameraFragment.kt。你可以看到代码A。我认为该功能可以随时放大图片。

我发现一个画面可以当我是变焦调用它与SA小的值，例如zoomX(2f)，zoomX(3f)，但画面不会放大当我再次用大值，比如zoomX(6.0f)，zoomX(7.0f)为什么？

代码 A

   private lateinit var viewFinder: TextureView 
    private var preview: Preview? = null

    fun zoomX(orign: Float ){       
        val x=orign+1

        val singleWidth=viewFinder.width/x
        val singleHeight=viewFinder.height/x

        val left=viewFinder.width/2f-singleWidth/2f
        val right=left+singleWidth
        val top=viewFinder.height/2f-singleHeight/2f
        val bottom=top+singleHeight

        val my= Rect(left.toInt(), top.toInt(), right.toInt(), bottom.toInt())
        preview?.zoom(my)      
    }

我试图按照谷歌的“CameraX 入门”代码实验室进行操作，我尝试用 Java 而不是 Kotlin 来完成，但是当我运行它并尝试拍照时，它给了我一个错误，提示未绑定到有效相机. 我找不到代码中的错误所在。我检查了 logcat，它说表面可能有问题，它可能无效，但我不确定如何解决这个问题，有人可以帮我。我将在我的 XML 文件中包含我拥有的内容以及 startCamera 和 takePhoto 函数。

//xml file code
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<Button
    android:id="@+id/camera_capture_button"
    android:layout_width="100dp"
    android:layout_height="100dp"
    android:layout_marginBottom="50dp"
    android:scaleType="fitCenter"
    android:text="Take Photo"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintBottom_toBottomOf="parent"
    android:elevation="2dp" />

<androidx.camera.view.PreviewView
    android:id="@+id/viewFinder"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

</androidx.constraintlayout.widget.ConstraintLayout>




//start camera function
private void startCamera() throws ExecutionException, InterruptedException {
    previewView = findViewById(R.id.viewFinder);
    ListenableFuture<ProcessCameraProvider> cameraProviderFuture = ProcessCameraProvider.getInstance(MainActivity.this);

    cameraProviderFuture.addListener(() -> {
        try {
            // Used to bind the lifecycle of cameras to the lifecycle owner …

使用CameraX.LensFacing.FRONT，在模拟器上进行测试时会发生此错误

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: meter.meter, PID: 15289
    java.lang.RuntimeException: Unable to start activity ComponentInfo{meter.meter/meter.meter.CameraActivity}: java.lang.IllegalArgumentException: Suggested resolution map missing resolution for camera 1
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2913)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:6669)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
     Caused by: java.lang.IllegalArgumentException: Suggested resolution map missing resolution for camera 1
        at androidx.camera.core.Preview.onSuggestedResolutionUpdated(Preview.java:310)
        at androidx.camera.core.UseCase.updateSuggestedResolution(UseCase.java:375)
        at androidx.camera.core.CameraX.calculateSuggestedResolutions(CameraX.java:458)
        at androidx.camera.core.CameraX.bindToLifecycle(CameraX.java:144)
        at meter.meter.CameraActivity.onCreate(CameraActivity.java:68)
        at android.app.Activity.performCreate(Activity.java:7136)
        at android.app.Activity.performCreate(Activity.java:7127)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893) …

我正在尝试使用Firebase ML套件扫描二维码，但无法在 android Pie（诺基亚 6.1 Plus）上启动相机。但是，相同的代码可以正常工作Android Oreo Redmi 6 A

这是我的毕业证书：

implementation "com.google.firebase:firebase-ml-vision:21.0.0"
implementation "androidx.camera:camera-core:1.0.0-alpha05"
implementation "androidx.camera:camera-camera2:1.0.0-alpha05"

我已经在 Manifest 中提供了所有必需的权限和相机功能

这是我如何使用 Camera X 代码：

      val previewConfig = PreviewConfig.Builder()
                .setLensFacing(CameraX.LensFacing.BACK)
                .build()

      val preview = Preview(previewConfig)


 preview.setOnPreviewOutputUpdateListener { previewOutput ->
                    textureView.surfaceTexture = previewOutput.surfaceTexture
                }


val imageAnalysisConfig = ImageAnalysisConfig.Builder()
                    .build()
                val imageAnalysis = ImageAnalysis(imageAnalysisConfig)

日志猫：

   E/libc: Access denied finding property "vendor.camera.aux.packagelist"
    W/com.zup.cash: type=1400 audit(0.0:17168): avc: denied { read } for name="u:object_r:vendor_camera_prop:s0" dev="tmpfs" ino=18547 scontext=u:r:untrusted_app:s0:c130,c258,c512,c768 tcontext=u:object_r:vendor_camera_prop:s0 tclass=file permissive=0
E/GLConsumer: [SurfaceTexture-0-7457-1] …

最近几个月，Android 发布了一个新的 API camerax。我试图了解如何让相机自动对焦工作。

https://groups.google.com/a/android.com/forum/#!searchin/camerax-developers/auto $20focus|sort:date/camerax-developers/IQ3KZd8iOIY/LIbrRIqEBgAJ

这是关于该主题的讨论，但几乎没有关于它的具体文档。

https://github.com/android/camera-samples/tree/master/CameraXBasic/app/src/main/java/com/android/example/cameraxbasic

这也是基本的camerax应用程序，但我找不到任何处理自动对焦的文件。

任何有关文档的提示或要点都是有帮助的。另外，我对 android 还很陌生，所以很可能我遗漏了一些使上述链接更有用的东西。

我正在尝试按照Google Codelabs 中的示例使用 CameraX 创建自定义相机应用程序。

该教程特别指出：

We recommend using an AVD that is based on Android 11 or higher.

它可以正常工作，API 29 (Android 10)但不能正常工作API 30 (Android 10+)并产生以下错误：

2020-08-11 11:22:34.979 8607-8698/com.codelabs.camerax E/CameraCaptureSession: Session 0: Exception while stopping repeating: 
    android.hardware.camera2.CameraAccessException: CAMERA_ERROR (3): cancelRequest:459: Camera 0: Error clearing streaming request: Function not implemented (-38)
        at android.hardware.camera2.CameraManager.throwAsPublicException(CameraManager.java:1009)
        at android.hardware.camera2.impl.ICameraDeviceUserWrapper.cancelRequest(ICameraDeviceUserWrapper.java:99)
        at android.hardware.camera2.impl.CameraDeviceImpl.stopRepeating(CameraDeviceImpl.java:1263)
        at android.hardware.camera2.impl.CameraCaptureSessionImpl.close(CameraCaptureSessionImpl.java:578)
        at android.hardware.camera2.impl.CameraCaptureSessionImpl$2.onDisconnected(CameraCaptureSessionImpl.java:789)
        at android.hardware.camera2.impl.CameraDeviceImpl$7.run(CameraDeviceImpl.java:245)
        at androidx.camera.core.impl.utils.executor.SequentialExecutor$1.run(SequentialExecutor.java:110)
        at androidx.camera.core.impl.utils.executor.SequentialExecutor$QueueWorker.workOnQueue(SequentialExecutor.java:230)
        at androidx.camera.core.impl.utils.executor.SequentialExecutor$QueueWorker.run(SequentialExecutor.java:172)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:923) …

我正在尝试使用图像捕获中包含的叠加来捕获图片。我能够将覆盖设置为previewView使用cameraView.overlay.add(binding.textView). 但是，当尝试使用imageCapture仅保存图片而不保存叠加的图像时，它没有保存。如何使用PreviewView相机 x保存包含叠加的图像。

请不要将此标记为重复。我研究了很多，大多数在线示例都使用camera不适用于相机 x 库的旧api。任何帮助表示赞赏。提前致谢。

这是我的代码

           <FrameLayout
                android:id="@+id/camera_wrapper"
                android:layout_width="match_parent"
                android:layout_height="0dp"
                app:layout_constraintTop_toTopOf="@id/space1"
                app:layout_constraintBottom_toBottomOf="@id/space">
    
                <androidx.camera.view.PreviewView
                    android:id="@+id/camera_view"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent" />
    
                <TextView
                    android:id="@+id/text_view"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center"
                    android:text="Hello world"
                    android:textSize="42sp"
                    android:textColor="@android:color/holo_green_dark"/>
    
            </FrameLayout>

  private lateinit var outputDirectory: File
  private lateinit var cameraExecutor: ExecutorService
  private var preview: Preview? = null
  private var lensFacing: Int = CameraSelector.LENS_FACING_FRONT
  private var imageCapture: ImageCapture? = null
  private var camera: Camera? = null
  private var cameraProvider: ProcessCameraProvider? = null

override fun …