我想实现一个自定义 View ，它将使用 Camera X API 显示实时预览，但我坚持使用 Camera X 的配置...
基于CameraX sample code ，我尝试实现我的自定义 View ，但只出现黑屏，并且我的日志显示:
E/Camera: Unable to configure camera 1, timeout!
这是我的 Activity 布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/root"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/colorBlack"
tools:context=".MainActivity">
<com.component.LiveView
android:id="@+id/live"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:adjustViewBounds="true"
android:background="@android:color/black" />
</RelativeLayout>
以及与我的组件相关的代码
override fun onResume() {
super.onResume()
when {
ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED ->
// Start camera preview
live.start(this)
ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.CAMERA) -> ConfirmationDialogFragment.newInstance(R.string.camera_permission_confirmation,
arrayOf(Manifest.permission.CAMERA),
REQUEST_CAMERA_PERMISSION,
R.string.camera_permission_not_granted)
.show(supportFragmentManager, FRAGMENT_DIALOG)
else -> ActivityCompat.requestPermissions(this, arrayOf(Manifest.permission.CAMERA),
REQUEST_CAMERA_PERMISSION)
}
}
现在，我的
Live组件是这样的class LiveView(context: Context, attrs: AttributeSet) : CameraSourcePreview(context, attrs) {
init {
if (BuildConfig.DEBUG) {
Timber.plant(Timber.DebugTree())
} else {
Timber.plant(TimberReleaseTree())
}
Timber.e("LiveView init")
}
fun start(livecycleOwner: LifecycleOwner) {
super.start(livecycleOwner)
Timber.e("LiveView start")
}
}
/** Preview the camera image in the screen. */
open class CameraSourcePreview(context: Context, attrs: AttributeSet) : ViewGroup(context, attrs) {
private val previewView = PreviewView(context, attrs)
private var displayId: Int = -1
private var lensFacing: Int = CameraSelector.LENS_FACING_FRONT
private var preview: Preview? = null
private var imageCapture: ImageCapture? = null
private var imageAnalyzer: ImageAnalysis? = null
private var camera: Camera? = null
private val displayManager by lazy {
context.getSystemService(Context.DISPLAY_SERVICE) as DisplayManager
}
/** Blocking camera operations are performed using this executor */
private lateinit var cameraExecutor: ExecutorService
/**
* We need a display listener for orientation changes that do not trigger a configuration
* change, for example if we choose to override config change in manifest or for 180-degree
* orientation changes.
*/
private val displayListener = object : DisplayManager.DisplayListener {
override fun onDisplayAdded(displayId: Int) = Unit
override fun onDisplayRemoved(displayId: Int) = Unit
override fun onDisplayChanged(displayId: Int) {
if (displayId == this@CameraSourcePreview.displayId) {
Timber.d("Rotation changed: ${display.rotation}")
imageCapture?.targetRotation = display.rotation
imageAnalyzer?.targetRotation = display.rotation
}
}
}
/**
* Starts camera source preview.
*/
@Throws(IOException::class)
fun start(lifecycleOwner: LifecycleOwner) {
Timber.e("CameraSourcePreview start")
// Initialize our background executor
cameraExecutor = Executors.newSingleThreadExecutor()
// Wait for the views to be properly laid out
addView(previewView)
//previewView.preferredImplementationMode = PreviewView.ImplementationMode.SURFACE_VIEW // seen on https://stackoverflow.com/a/60559642/10159898 bit it doesn't change anything
previewView.post {
// Keep track of the display in which this view is attached
displayId = previewView.display.displayId
Timber.e("CameraSourcePreview start post")
// Bind use cases to lifecycle
bindCameraUseCases(lifecycleOwner)
}
}
/**
* Stop camera source preview. It is requirement to implement this part.
* Recommended to implement it onPause function.
*/
fun stop() {
// Shut down our background executor
cameraExecutor.shutdown()
Timber.e("CameraSourcePreview stop")
// Unregister the broadcast receivers and listeners
displayManager.unregisterDisplayListener(displayListener)
}
/** Declare and bind preview, capture and analysis use cases */
private fun bindCameraUseCases(lifecycleOwner: LifecycleOwner) {
Timber.e("CameraSourcePreview bindCameraUseCases")
// Get screen metrics used to setup camera for full screen resolution
val metrics = DisplayMetrics().also { previewView.display.getRealMetrics(it) }
Timber.d("Screen metrics: ${metrics.widthPixels} x ${metrics.heightPixels}")
val targetAspectRatio = aspectRatio(metrics.widthPixels, metrics.heightPixels)
Timber.d("Preview aspect ratio: $targetAspectRatio")
val targetRotation = previewView.display.rotation
val cameraSelector = CameraSelector.Builder()
.requireLensFacing(lensFacing)
.build()
// Bind the CameraProvider to the LifeCycleOwner
val cameraProviderFuture = ProcessCameraProvider.getInstance(context)
cameraProviderFuture.addListener(Runnable {
// CameraProvider
val cameraProvider = cameraProviderFuture.get()
// Preview Usecase
preview = Preview.Builder()
// We request aspect ratio but no resolution
.setTargetAspectRatio(targetAspectRatio)
// Set initial target rotation
.setTargetRotation(targetRotation)
.build()
// Must unbind the use-cases before rebinding them
cameraProvider.unbindAll()
try {
// A variable number of use-cases can be passed here -
// camera provides access to CameraControl & CameraInfo
camera = cameraProvider.bindToLifecycle(
lifecycleOwner, cameraSelector, preview)
preview?.setSurfaceProvider(previewView.createSurfaceProvider(camera?.cameraInfo))
} catch (exc: Exception) {
Timber.e("Use case binding failed: ${exc.message}")
}
}, ContextCompat.getMainExecutor(context))
}
/**
* [androidx.camera.core.ImageAnalysisConfig] requires enum value of
* [androidx.camera.core.AspectRatio]. Currently it has values of 4:3 & 16:9.
*
* Detecting the most suitable ratio for dimensions provided in @params by counting absolute
* of preview ratio to one of the provided values.
*
* @param width - preview width
* @param height - preview height
* @return suitable aspect ratio
*/
private fun aspectRatio(width: Int, height: Int): Int {
Timber.e("CameraSourcePreview aspectRatio")
val previewRatio = max(width, height).toDouble() / min(width, height)
if (abs(previewRatio - RATIO_4_3_VALUE) <= abs(previewRatio - RATIO_16_9_VALUE)) {
return AspectRatio.RATIO_4_3
}
return AspectRatio.RATIO_16_9
}
/**
* Recalculate the camera preview size.
*/
override fun onLayout(changed: Boolean, left: Int, top: Int, right: Int, bottom: Int) {
// Timber.e("CameraSourcePreview onLayout: $changed, $left, $top, $right, $bottom")
// var width = 480
// var height = 640
//
// // Swap width and height sizes when in portrait, since it will be rotated 90 degrees
// if (isPortraitMode) {
// val tmp = width
// width = height
// height = tmp
// }
// val layoutWidth = right - left
// val layoutHeight = bottom - top
// // Computes height and width for potentially doing fit width.
// var childWidth = layoutWidth
// var childHeight = (layoutWidth.toFloat() / width.toFloat() * height).toInt()
// // If height is too tall using fit width, does fit height instead.
// if (childHeight > layoutHeight) {
// childHeight = layoutHeight
// childWidth = (layoutHeight.toFloat() / height.toFloat() * width).toInt()
// }
// for (i in 0 until childCount) {
// getChildAt(i).layout(0, 0, childWidth, childHeight)
// Timber.d("Assigned view: $i")
// }
}
companion object {
private const val RATIO_4_3_VALUE = 4.0 / 3.0
private const val RATIO_16_9_VALUE = 16.0 / 9.0
}
}
有人可以看看这个并指出我的问题吗？
笔记 :
最佳答案
我有一个类似的问题。
请检查您的 list 文件中是否关闭了硬件硬件加速。
我的 AndroidManifest.xml 中的示例:
<application
android:allowBackup="true"
android:hardwareAccelerated="false" <--- This setting must be removed
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
[...]
</application>
android:hardwareAccelerated="false" 行在那之后，它就像一个魅力。
希望它有效。
关于android - CameraX - 无法配置相机，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/61227001/