我是使用相机X库的新手。我正在尝试遵循here
中Google的代码实验室我可以显示预览并捕获图像。但是问题是......
当我以横向捕获图像时,图像结果将仍然为纵向。我想使其自动旋转。如果以风景拍摄图像,则结果应为风景,如果以人像拍摄,则结果应为人像。就像“相机”应用中的相机一样
该怎么做?
我正在使用Redmi Note 7,Android 10。
我使用的gradle:
implementation "androidx.camera:camera-camera2:1.0.0-beta11"
implementation "androidx.camera:camera-lifecycle:1.0.0-beta11"
implementation "androidx.camera:camera-view:1.0.0-alpha18"
这是我的代码,用于显示预览并捕获图像
class CameraFragment : Fragment() {
private var imageCapture: ImageCapture? = null
private lateinit var outputDirectory: File
private lateinit var cameraExecutor: ExecutorService
private var cameraSelector = CameraSelector.DEFAULT_BACK_CAMERA
companion object {
private const val TAG = "CameraFragment"
private const val FILENAME_FORMAT = "yyyy-MM-dd-HH-mm-ss-SSS"
private const val CAMERA_REQUEST_CODE_PERMISSIONS = 10
}
lateinit var mContext : Context
lateinit var mActivity : FragmentActivity
override fun onAttach(context: Context) {
super.onAttach(context)
mContext = context
activity?.let { mActivity = it }
}
private fun getOutputDirectory(): File {
val mediaDir = mActivity.externalMediaDirs.firstOrNull()?.let {
File(it, resources.getString(R.string.app_name)).apply { mkdirs() }
}
return if (mediaDir != null && mediaDir.exists())
mediaDir else mActivity.filesDir
}
private fun startCamera() {
val cameraProviderFuture = ProcessCameraProvider.getInstance(mContext)
cameraProviderFuture.addListener(Runnable {
// Used to bind the lifecycle of cameras to the lifecycle owner
val cameraProvider: ProcessCameraProvider = cameraProviderFuture.get()
// Preview
val preview = Preview.Builder()
.build()
.also {
it.setSurfaceProvider(previewView.surfaceProvider)
}
imageCapture = ImageCapture.Builder().build()
try {
// Unbind use cases before rebinding
cameraProvider.unbindAll()
// Bind use cases to camera
cameraProvider.bindToLifecycle(
this, cameraSelector, preview, imageCapture)
} catch (exc: Exception) {
Log.e(TAG, "Use case binding failed", exc)
}
}, ContextCompat.getMainExecutor(mContext))
}
private fun takePhoto() {
// Get a stable reference of the modifiable image capture use case
val imageCapture = imageCapture ?: return
// Create time-stamped output file to hold the image
val photoFile = File(
outputDirectory,
SimpleDateFormat(FILENAME_FORMAT, Locale.US
).format(System.currentTimeMillis()) + ".jpg")
// Create output options object which contains file + metadata
val outputOptions = ImageCapture.OutputFileOptions.Builder(photoFile).build()
// Set up image capture listener, which is triggered after photo has
// been taken
imageCapture.takePicture(outputOptions, ContextCompat.getMainExecutor(mContext), object : ImageCapture.OnImageSavedCallback {
override fun onError(exc: ImageCaptureException) {
Log.d("agungxxx", "2: ${exc.localizedMessage}")
Log.e(TAG, "Photo capture failed: ${exc.message}", exc)
}
override fun onImageSaved(output: ImageCapture.OutputFileResults) {
cameraSharedViewModel.sendImageUriPathToPreviousDestination(photoFile)
findNavController().navigateUp()
}
})
}
}
答案 0 :(得分:1)
捕获的图像的旋转取决于ImageCapture
用例中的the target rotation。默认情况下,当应用程序未设置时,它等于Display.getRotation()
,其中Display
是创建ImageCapture
用例时的默认显示。
这意味着您需要在每次显示器方向改变时(例如,每次更改ImageCapture
)更改目标val orientationEventListener = object : OrientationEventListener(this) {
override fun onOrientationChanged(orientation: Int) {
if (orientation == OrientationEventListener.UNKNOWN_ORIENTATION) {
return
}
val rotation = when (orientation) {
in 45 until 135 -> Surface.ROTATION_270
in 135 until 225 -> Surface.ROTATION_180
in 225 until 315 -> Surface.ROTATION_90
else -> Surface.ROTATION_0
}
imageCapture.targetRotation = rotation
}
}
的旋转角度。当设备从纵向旋转到横向旋转时。
我假设您的活动方向已锁定(?)。在这种情况下,您可以使用OrientationEventListener
来连续获取设备旋转的更新,然后相应地更新用例的目标旋转。
orientationEventListener
您应该在活动的生命周期启动/停止时启动/停止{{1}},这也与相机的启动/停止时相匹配。您可以看到此here的示例。
您还可以进一步了解CameraX的用例和轮换方式in the official documentation。