Camera2 - 手动设置 ISO，同时保持 FLASH_MODE 为 FLASH_MODE_TORCH

Question

我尝试设置 ISO 100，同时保持闪光灯打开，就像使用 OpenCamera 和 HedgeCam2

所做的那样

为了做到这一点，我必须设置（CaptureRequest.CONTROL_AE_MODE，CaptureRequest.CONTROL_AE_MODE_OFF），然后我可以更改CaptureRequest.SENSOR_SENSITIVITY

但是当我也尝试设置（CaptureRequest.FLASH_MODE，CaptureRequest.FLASH_MODE_TORCH）时，问题出现了，如果我关闭自动曝光控制，那么我的设备会关闭手电筒。

val previewRequest: CaptureRequest.Builder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW)
previewRequest.addTarget(previewSurface)
previewRequest.apply {
    set(CaptureRequest.FLASH_MODE, CaptureRequest.FLASH_MODE_TORCH)
    set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_OFF)
    set(CaptureRequest.SENSOR_SENSITIVITY, 100)
}
cameraCaptureSession.setRepeatingRequest(previewRequest.build(), captureCallbacks, backgroundHandler)