如何花时间直到焦点在图像上拍摄而不是拍照？camera2API

我使用相机2 API。

我使用标准谷歌样本的相机。

问题是代码允许用户拍照，即使图像不在焦点…

private final CameraCaptureSession.CaptureCallback mCaptureCallback = new CameraCaptureSession.CaptureCallback() { @Override public void onCaptureProgressed(@NonNull CameraCaptureSession session, @NonNull CaptureRequest request, @NonNull CaptureResult partialResult) { } @Override public void onCaptureCompleted(@NonNull CameraCaptureSession session, @NonNull CaptureRequest request, @NonNull TotalCaptureResult result) { process(result); } private void process(CaptureResult result) { switch (mState) { case CameraHelper.STATE_PREVIEW: { // We have nothing to do when the camera preview is working normally. break; } case CameraHelper.STATE_WAITING_LOCK: { Integer afState = result.get(CaptureResult.CONTROL_AF_STATE); if (afState == null) { captureStillPicture(); } else if (CaptureResult.CONTROL_AF_STATE_FOCUSED_LOCKED == afState || CaptureResult.CONTROL_AF_STATE_NOT_FOCUSED_LOCKED == afState) { // CONTROL_AE_STATE can be null on some devices Integer aeState = result.get(CaptureResult.CONTROL_AE_STATE); if (aeState == null || aeState == CaptureResult.CONTROL_AE_STATE_CONVERGED) { mState = CameraHelper.STATE_PICTURE_TAKEN; captureStillPicture(); } else { runPrecaptureSequence(); } } break; } case CameraHelper.STATE_WAITING_PRECAPTURE: { // CONTROL_AE_STATE can be null on some devices Integer aeState = result.get(CaptureResult.CONTROL_AE_STATE); if (aeState == null || aeState == CaptureResult.CONTROL_AE_STATE_PRECAPTURE || aeState == CaptureRequest.CONTROL_AE_STATE_FLASH_REQUIRED) { mState = CameraHelper.STATE_WAITING_NON_PRECAPTURE; } break; } case CameraHelper.STATE_WAITING_NON_PRECAPTURE: { // CONTROL_AE_STATE can be null on some devices Integer aeState = result.get(CaptureResult.CONTROL_AE_STATE); if (aeState == null || aeState != CaptureResult.CONTROL_AE_STATE_PRECAPTURE) { mState = CameraHelper.STATE_PICTURE_TAKEN; captureStillPicture(); } break; } } } }; 

这是标准的回调

如何在常规相机中实现smth，当用户点击拍照按钮时，第一台相机拍摄焦点，然后才拍照…

但就我而言，即使图片不在焦点，也可以拍照…

我究竟做错了什么？

编辑

 private void captureStillPicture() { try { if (null == cameraDevice) { return; } // This is the CaptureRequest.Builder that we use to take a picture. final CaptureRequest.Builder captureBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE); captureBuilder.addTarget(imageReader.getSurface()); captureBuilder.set(CaptureRequest.JPEG_QUALITY, (byte) 100); // Use the same AE and AF modes as the preview. captureBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE); setAutoFlash(captureBuilder); // Orientation int rotation = getWindowManager().getDefaultDisplay().getRotation(); captureBuilder.set(CaptureRequest.JPEG_ORIENTATION, CameraHelper.ORIENTATIONS.get(rotation)); // Этот метод показывает, что будет происходить после того как снимок будет сделан final CameraCaptureSession.CaptureCallback CaptureCallback = new CameraCaptureSession.CaptureCallback() { @Override public void onCaptureCompleted(@NonNull CameraCaptureSession session, @NonNull CaptureRequest request, @NonNull TotalCaptureResult result) { Logger.logGeneral("LENS_FOCAL_LENGTH : " + request.get(CaptureRequest.LENS_FOCAL_LENGTH)); unlockFocus(); } }; captureSession.stopRepeating(); captureSession.capture(captureBuilder.build(), CaptureCallback, null); } catch (CameraAccessException e) { e.printStackTrace(); } } 

EDIT2

如果没有设置焦点，也许我不必让用户拍照？ 这意味着我应该每时每刻跟踪焦点状态，最终当用户点击拍照按钮时，我应该检查焦点状态，如果它是焦点 – 拍照，如果没有 – 显示Toast - set up focus

我根据这个问题找到了代码片段

 private CameraCaptureSession.CaptureCallback mCaptureCallback = new CameraCaptureSession.CaptureCallback() { private void process(CaptureResult result) { switch (mState) { case STATE_PREVIEW: { int afState = result.get(CaptureResult.CONTROL_AF_STATE); if (CaptureResult.CONTROL_AF_TRIGGER_START == afState) { if (areWeFocused) { //Run specific task here } } if (CaptureResult.CONTROL_AF_STATE_PASSIVE_FOCUSED == afState) { areWeFocused = true; } else { areWeFocused = false; } break; } } } @Override public void onCaptureProgressed(CameraCaptureSession session, CaptureRequest request, CaptureResult partialResult) { process(partialResult); } @Override public void onCaptureCompleted(CameraCaptureSession session, CaptureRequest request, TotalCaptureResult result) { process(result); } }; 

我遇到了这种情况result.get（CaptureResult.CONTROL_AF_STATE）; 总是返回0 … 0它是CaptureResult.CONTROL_AF_STATE_INACTIVE。 我在三星S5上面对它进行了测试……但同样的代码总是在魅族MX5上返回1或2 …有什么区别？

我究竟做错了什么？

只有当相机对焦时我才能拍照？