我正在使用 6.0.1 在 Nexus 5 上测试我的 Camera2 实现。该问题似乎与切换闪光灯模式有关。出乎意料的是，更换闪光灯和拍照会导致 AF 未锁定，并且日志中会出现以下内容：
01-13 11:02:53.184 214 7175 I mm-camera: af_exhaustive_search: AEC not settled. Returning!
01-13 11:02:53.217 214 7175 I mm-camera: af_exhaustive_search: AEC not settled. Returning!
01-13 11:02:53.251 214 7175 I mm-camera: af_exhaustive_search: AEC not settled. Returning!
01-13 11:02:53.284 214 7175 I mm-camera: af_exhaustive_search: AEC not settled. Returning!
01-13 11:02:53.318 214 7175 I mm-camera: af_exhaustive_search: AEC not settled. Returning!
01-13 11:02:53.351 214 7175 I mm-camera: af_exhaustive_search: AEC not settled. Returning!
01-13 11:02:53.385 214 7175 I mm-camera: af_exhaustive_search: AEC not settled. Returning!
01-13 11:02:53.419 214 7175 I mm-camera: af_exhaustive_search: AEC not settled. Returning!
01-13 11:02:53.452 214 7175 I mm-camera: af_exhaustive_search: AEC not settled. Returning!
01-13 11:02:53.485 214 7175 I mm-camera: af_exhaustive_search: AEC not settled. Returning!
01-13 11:02:53.519 214 7175 I mm-camera: af_exhaustive_search: AEC not settled. Returning!
01-13 11:02:53.552 214 7175 I mm-camera: af_exhaustive_search: AEC not settled. Returning!
01-13 11:02:53.586 214 7175 I mm-camera: af_exhaustive_search: AEC not settled. Returning!
01-13 11:02:53.619 214 7175 I mm-camera: af_exhaustive_search: AEC not settled. Returning!
01-13 11:02:53.653 214 7175 I mm-camera: af_exhaustive_search: AEC not settled. Returning!
01-13 11:02:54.031 214 7174 I mm-camera-sensor: port_sensor_process_aec_est:686 AEC EST DONE
01-13 11:02:54.031 214 7174 I mm-camera-sensor: port_sensor_process_aec_est:686 AEC EST DONE
01-13 11:02:54.031 214 7174 I mm-camera-sensor: port_sensor_process_aec_est:688 regular_led_trigger 1
01-13 11:02:54.648 804 1488 D NetlinkSocketObserver: NeighborEvent{elapsedMs=947757, 10.12.0.254, [000D483417C9], RTM_NEWNEIGH, NUD_PROBE}
01-13 11:02:56.000 197 791 D audio_hw_primary: disable_audio_route: reset and update mixer path: low-latency-playback
01-13 11:02:56.001 197 791 D audio_hw_primary: disable_snd_device: snd_device(2: speaker)
01-13 11:02:57.048 214 7192 E mm-camera-sensor: port_sensor_handle_upstream_module_event:1444 Reset previously set LED state!
01-13 11:02:57.048 214 7192 I AEC_PORT: aec_port_proc_downstream_event: Received LED state timeout. Reset LED state!
01-13 11:02:59.918 214 7175 E mm-camera: af_process_parse_stats: Invalid FV data!
01-13 11:02:59.918 214 7175 E mm-camera: af_process: Error processing AF stats!
01-13 11:02:59.952 214 7175 E mm-camera: af_process_parse_stats: Invalid FV data!
01-13 11:02:59.952 214 7175 E mm-camera: af_process: Error processing AF stats!
如果我在不切换闪光灯模式的情况下继续拍照，它可以正常工作（即使闪光灯始终打开）。仅当我切换闪光模式时才会发生这种情况，并且哪种模式处于活动状态似乎并不重要（因此从 FLASH ON 到 FLASH AUTO 或从 FLASH AUTO 到 FLASH OFF 都可能导致此错误）。
这是我更改闪光灯模式的代码：
private void setFlashMode(String mode) {
if (mode.equals(CAMERA_FLASH_OFF) ) {
mPreviewRequestBuilder
.set(CaptureRequest.CONTROL_AE_MODE, CameraMetadata.CONTROL_AE_MODE_ON);
mPreviewRequestBuilder.set(CaptureRequest.FLASH_MODE, CameraMetadata.FLASH_MODE_OFF);
}
else if(mode.equals(CAMERA_FLASH_AUTO)) {
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CameraMetadata.CONTROL_AE_MODE_ON_AUTO_FLASH);
mPreviewRequestBuilder.set(CaptureRequest.FLASH_MODE, CameraMetadata.FLASH_MODE_OFF);
}
else if(mode.equals(CAMERA_FLASH_ON)) {
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CameraMetadata.CONTROL_AE_MODE_ON_ALWAYS_FLASH);
mPreviewRequestBuilder.set(CaptureRequest.FLASH_MODE, CameraMetadata.FLASH_MODE_OFF);
}
else if(mode.equals(CAMERA_FLASH_TORCH)) {
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CameraMetadata.CONTROL_AE_MODE_ON);
mPreviewRequestBuilder.set(CaptureRequest.FLASH_MODE, CameraMetadata.FLASH_MODE_TORCH);
}
try {
mCaptureSession.setRepeatingRequest(mPreviewRequestBuilder.build(), null,
mBackgroundHandler);
if (getOnCameraParametersSetListener() != null) {
getOnCameraParametersSetListener().onCameraParametersSet();
}
} catch (CameraAccessException e) {
Log.e(TAG,
".setFlashMode() - Exception caught while setting the capture session request",
e);
}
}
非常感谢任何帮助。