在Android 13（API 33）中，出现了一个新控件来调整手电筒亮度：
public void turnOnTorchWithStrengthLevel ( cameraId, int torchStrength)
https：//developer.android.com/reference/android/hardware/camera2/CameraManager#turnOnTorchWithStrengthLevel（java. lang. String，%20int）
但在工作相机预览期间调用此函数会引发异常：*android.hardware.camera2.CameraAccessException：CAMERA_IN_USE（4）：turnOnTorchWithStrength等级：2596：由于现有摄像机用户，摄像机“0”的手电筒不可用 *
在预览期间使用简单 Torch 的唯一方法是使用如下选项调整捕获请求构建器：builder.set(CaptureRequest.FLASH_MODE, if (isOn) CaptureRequest.FLASH_MODE_TORCH else CaptureRequest.FLASH_MODE_OFF)但它不允许修改手电筒亮度。
我有这样的代码只是为了在相机预览期间打开/关闭手电筒。它工作正常。

override fun switchTorch(isOn: Boolean) {
        if (cameraOpened.get()) {

            val session = captureSession
            val builderAndHandler = captureRequestBuilderWithHandler

            if (session != null && builderAndHandler != null) {
                val (builder, handler) = builderAndHandler
                session.stopRepeating()
                isTorchInProgress = isOn
                builder.set(CaptureRequest.FLASH_MODE, if (isOn) CaptureRequest.FLASH_MODE_TORCH else CaptureRequest.FLASH_MODE_OFF)
                session.setRepeatingRequest(builder.build(), null, handler)
            }
        } else {
            postponedSwitchTorch = isOn
        }
    }

我试图实现一个功能的Android 13只修改亮度水平如下：

override fun setTorchStrengthLevel(level: Int) {
    Log.d("qaz", "Api2. setTorchStrengthLevel: $level")
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
        if (cameraOpened.get()) {

            val session = captureSession
            val builderAndHandler = captureRequestBuilderWithHandler

            if (session != null && builderAndHandler != null) {
                val (builder, handler) = builderAndHandler
                session.stopRepeating()
                cameraManager.turnOnTorchWithStrengthLevel(cameraDevice.id, level)
                builder.set(CaptureRequest.FLASH_MODE, CaptureRequest.FLASH_MODE_TORCH)
                session.setRepeatingRequest(builder.build(), null, handler)
            } else {
                Log.w("qaz", "skip setTorch, because session or buildANdHandler are null")
            }
        } else {
            Log.w("qaz", "skip setTorch, because camera is not opened")
        }
    } else {
        throw IllegalAccessException("This function should be called only on Android T or higher")
    }
}

调用**turnOnTorchWithStrengthLevel（cameraDevice.id，level）***CameraAccessException时抛出异常：CAMERA_IN_USE（4）：turnOnTorchWithStrength等级：2596：由于现有摄像机用户，摄像机“0”的手电筒不可用
如何在相机预览在Android 13（T）上工作时更改手电筒亮度？