如何正确设置CONTROL_SCENE_MODE_ACTION camera2API？

Question

我需要为我的应用程序camera2API设置CONTROL_SCENE_MODE_ACTION。

我tryed将其设置captureStillPicture()方法然后在lockFocus()方法随后在stateCallback但没有工作...

在文档，我发现唯一的解释是什么，但任何行这种模式怎么也得成立...

有2个问题：

1. 哪里exacly我必须设置该模式
2. 如何检查它是否工作

或者，也许你可以建议我如何reduse暴露时间...提前

感谢

Answer 1

您可以通过添加行修改从Google Camera2Basic sampleCamera2BasicFragment

mPreviewRequestBuilder.set(CaptureRequest.CONTROL_SCENE_MODE, CaptureRequest.CONTROL_SCENE_MODE_ACTION);

刚后行

mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);

在例如 onConfigured()方法

@Override 
public void onConfigured(@NonNull CameraCaptureSession cameraCaptureSession) { 
    // The camera is already closed 
    if (null == mCameraDevice) { 
     return; 
    } 

    // When the session is ready, we start displaying the preview. 
    mCaptureSession = cameraCaptureSession; 
    try { 
     // Auto focus should be continuous for camera preview. 
     mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE, 
       CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE); 
     mPreviewRequestBuilder.set(CaptureRequest.CONTROL_SCENE_MODE, 
       CaptureRequest.CONTROL_SCENE_MODE_ACTION); 
     // Flash is automatically enabled when necessary. 
     setAutoFlash(mPreviewRequestBuilder); 

     // Finally, we start displaying the camera preview. 
     mPreviewRequest = mPreviewRequestBuilder.build(); 
     mCaptureSession.setRepeatingRequest(mPreviewRequest, 
       mCaptureCallback, mBackgroundHandler); 
    } catch (CameraAccessException e) { 
     e.printStackTrace(); 
    } 
}