CameraX - 在縱向模式下鎖定活動時僅旋轉預覽

Question

1. 設置 -> 手機固定在支架上，無法旋轉。 相機正對着筆記本

2. MyCameraActivity -> 固定方向 -> 縱向

3. 用戶應該能夠在單擊按鈕時旋轉預覽，即我的預覽應該被旋轉（例如，如果我在開始時看到向上箭頭，那么點擊用戶應該能夠向右箭頭）

我能夠在 camera2 中執行此操作，但找不到有關 cameraX 的任何有用信息。

Answer 1

CameraX 的PreviewView現在支持該功能。 使用 PreviewView，您只需將預覽置於兼容模式即可旋轉預覽，然后設置預覽的目標旋轉。

代碼示例：

previewView.setImplementationMode(COMPATIBLE)
preview.setTargetRotation(ROTATION_0)

Answer 2

解決 camerax 版本 1.0.0-alpha2

1. 在更新變換中設置矩陣。
2. 旋轉 textview 旋轉預覽

類似的邏輯也可以應用於 Camera2 api（為我工作）

private Preview setPreview() {

        PreviewConfig pConfig = new PreviewConfig.Builder()
                .setLensFacing(CameraX.LensFacing.BACK)
                .build();
        Preview preview = new Preview(pConfig);

        preview.setOnPreviewOutputUpdateListener(
                output -> {
                    ViewGroup parent = (ViewGroup) binding.viewFinder.getParent();
                    parent.removeView(binding.viewFinder);
                    parent.addView(binding.viewFinder, 0);
                    binding.viewFinder.setSurfaceTexture(output.getSurfaceTexture());
                    updateTransform();
                });

        return preview;
    }


    private void updateTransform() {
        float viewWidth = binding.viewFinder.getMeasuredWidth();
        float viewHeight = binding.viewFinder.getMeasuredHeight();
         Size mPreviewSize = new Size(1080,720);

        Activity activity = getActivity();
        if (null == binding.viewFinder || null == mPreviewSize || null == activity) {
            return;
        }
        int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();
        Matrix matrix = new Matrix();
        RectF viewRect = new RectF(0, 0, viewWidth, viewHeight);
        RectF bufferRect = new RectF(0, 0, mPreviewSize.getHeight(), mPreviewSize.getWidth());
        float centerX = viewRect.centerX();
        float centerY = viewRect.centerY();
        if (Surface.ROTATION_90 == rotation || Surface.ROTATION_270 == rotation) {
            bufferRect.offset(centerX - bufferRect.centerX(), centerY - bufferRect.centerY());
            matrix.setRectToRect(viewRect, bufferRect, Matrix.ScaleToFit.FILL);
            float scale = Math.max(
                    (float) viewHeight / mPreviewSize.getHeight(),
                    (float) viewWidth / mPreviewSize.getWidth());
            matrix.postScale(scale, scale, centerX, centerY);
            matrix.postRotate(90 * (rotation - 2), centerX, centerY);
        } else if (Surface.ROTATION_180 == rotation) {
            matrix.postRotate(180, centerX, centerY);
        }
        binding.viewFinder.setTransform(matrix);
    }
    int rotatiion = 0;
    private void setRotationClickListener() {

        binding.captureButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (rotatiion == 0) {
                    rotatiion = 90;
                    binding.viewFinder.setRotation(90);
                }else if(rotatiion == 90) {
                    rotatiion = 180;
                    binding.viewFinder.setRotation(180);
                }else if(rotatiion == 180) {
                    rotatiion = 270;
                    binding.viewFinder.setRotation(270);
                }else if(rotatiion == 270) {
                    rotatiion = 0;
                    binding.viewFinder.setRotation(0);
                }
            }
        });
    }