Question

“如何将触摸焦点切换为自动焦点”

我正在尝试制作自定义相机2，但我遇到了问题。是在开始预览时，我的自定义相机是模式AUTO FOCUS，而当我触摸屏幕时，相机是TOUCH FOCUS模式，那么我想让我的相机自动对焦，但不能对焦，我必须触摸屏幕才能对焦。帮我！非常感谢

        @Override
        public boolean onTouch(View view, MotionEvent motionEvent) {
            isTouchFocus = true;
            final int actionMasked = motionEvent.getActionMasked();
            if (actionMasked != MotionEvent.ACTION_DOWN) {

                return false;
            }
            if (mManualFocusEngaged) {
                Log.d(TAG, "Manual focus already engaged");
                return true;
            }
            if (focusView.getParent() == frameLayout) {
                frameLayout.removeView(focusView);
            }
            int width = frameLayout.getWidth() / 4;
            int height = frameLayout.getHeight() / 4;
            frameLayout.addView(focusView, width, width);
            focusView.setColor(Color.GREEN);
            focusView.setX(motionEvent.getX() - width / 2);
            focusView.setY(motionEvent.getRawY() - width - width / 2);

            final Rect sensorArraySize = mCameraCharacteristics.get(CameraCharacteristics.SENSOR_INFO_ACTIVE_ARRAY_SIZE);

            //TODO: here I just flip x,y, but this needs to correspond with the sensor orientation (via SENSOR_ORIENTATION)
            final int y = (int) ((motionEvent.getX() / (float) view.getWidth()) * (float) sensorArraySize.height());
            final int x = (int) ((motionEvent.getY() / (float) view.getHeight()) * (float) sensorArraySize.width());
            final int halfTouchWidth = 50; //(int)motionEvent.getTouchMajor(); //TODO: this doesn't represent actual touch size in pixel. Values range in [3, 10]...
            final int halfTouchHeight = 50; //(int)motionEvent.getTouchMinor();
            MeteringRectangle focusAreaTouch = new MeteringRectangle(Math.max(x - halfTouchWidth, 0),
                    Math.max(y - halfTouchHeight, 0),
                    halfTouchWidth * 2,
                    halfTouchHeight * 2,
                    MeteringRectangle.METERING_WEIGHT_MAX - 1);

            CameraCaptureSession.CaptureCallback captureCallbackHandler = new CameraCaptureSession.CaptureCallback() {
                @Override
                public void onCaptureCompleted(@NonNull CameraCaptureSession session, @NonNull CaptureRequest request, @NonNull TotalCaptureResult result) {
                    super.onCaptureCompleted(session, request, result);
                    mManualFocusEngaged = false;

                    if (request.getTag() == "FOCUS_TAG") {
                        //the focus trigger is complete - resume repeating (preview surface will get frames), clear AF trigger
//                        captureRequestBuilder.remo
                        mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER, null);
                        try {
                            mCaptureSession.setRepeatingRequest(mPreviewRequestBuilder.build(), null, null);
                        } catch (CameraAccessException e) {
                            e.printStackTrace();
                        }
                    }
                }

                @Override
                public void onCaptureFailed(@NonNull CameraCaptureSession session, @NonNull CaptureRequest request, @NonNull CaptureFailure failure) {
                    super.onCaptureFailed(session, request, failure);
                    Log.e(TAG, "Manual AF failure: " + failure);
                    mManualFocusEngaged = false;
                }
            };

            //first stop the existing repeating request
            try {
                mCaptureSession.stopRepeating();
            } catch (CameraAccessException e) {
                e.printStackTrace();
            }

            //cancel any existing AF trigger (repeated touches, etc.)
            mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER, CameraMetadata.CONTROL_AF_TRIGGER_CANCEL);
            mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_OFF);
            try {
                mCaptureSession.capture(mPreviewRequestBuilder.build(), captureCallbackHandler, mBackgroundHandler);
            } catch (CameraAccessException e) {
                e.printStackTrace();
            }

            //Now add a new AF trigger with focus region
            if (isMeteringAreaAFSupported()) {
                mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_REGIONS, new MeteringRectangle[]{focusAreaTouch});
            }
            mPreviewRequestBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
            mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_AUTO);
            mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER, CameraMetadata.CONTROL_AF_TRIGGER_START);
            mPreviewRequestBuilder.setTag("FOCUS_TAG"); //we'll capture this later for resuming the preview

            //then we ask for a single request (not repeating!)
            try {
                mCaptureSession.capture(mPreviewRequestBuilder.build(), captureCallbackHandler, mBackgroundHandler);
            } catch (CameraAccessException e) {
                e.printStackTrace();
            }
            mManualFocusEngaged = true;

            return true;
        }

        private boolean isMeteringAreaAFSupported() {
            Integer value = mCameraCharacteristics.get(CameraCharacteristics.CONTROL_MAX_REGIONS_AF);
            if (value != null) {
                return value >= 1;
            } else {
                return false;
            }
        }`

如何将触摸焦点切换为自动焦点

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