Android Camera2放弃AF锁

Question

我正在用6.0.1在Nexus 5上测试我的Camera2实现。这个问题似乎与切换闪存模式有关。难以预料的是，更改闪存和拍照会导致AF没有锁定，下面的内容出现在日志中：

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!

如果我继续拍照，没有切换闪光灯模式，它工作很好(即使闪光灯总是开着)。这种情况只有在我切换闪存模式时才会发生，而且似乎不重要的是哪个模式是活动的(因此，从闪存到闪存自动或闪存自动闪存都会导致此错误)。

这是我更改闪存模式的代码：

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);
    }
}

任何帮助都非常感谢。

Answer 1

看起来问题在于调用setRepeatingRequest时没有传递回调。修复方法是添加原始回调。