android 自定义相机拉伸表面视图

Question

我遇到了相机视图的问题，即相机的视图被拉长了，不像默认相机应用程序或任何其他相机应用程序提供的那样提供正常视图。我一直无法获得相机用来拉伸大于屏幕尺寸的表面视图。

 enter code here
  private class SurfaceCallback implements SurfaceHolder.Callback {
    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        try {
            camera = Camera.open(); 
            camera.setPreviewDisplay(holder); 
            camera.setDisplayOrientation(getPreviewDegree(MainActivity.this));
            camera.startPreview(); // 
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
     @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        setCameraParameters();
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {

    }
}
  private int getPreviewDegree(Activity activity) {
    int rotation = activity.getWindowManager().getDefaultDisplay()
            .getRotation();
    int degree = 0;

    switch (rotation) {
        case Surface.ROTATION_0:
            degree = 90;
            break;
        case Surface.ROTATION_90:
            degree = 0;
            break;
        case Surface.ROTATION_180:
            degree = 270;
            break;
        case Surface.ROTATION_270:
            degree = 180;
            break;
    }
    return degree;
}

private void setCameraParameters() {

    Camera.Parameters parameters = camera.getParameters();

    List<Camera.Size> sizeList = parameters.getSupportedPreviewSizes();
    if (sizeList.size() > 0) {
        Camera.Size cameraSize = sizeList.get(0);

        parameters.setPreviewSize(cameraSize.width, cameraSize.height);
    }


    sizeList = parameters.getSupportedPictureSizes();
    if (sizeList.size() > 0) {
        Camera.Size cameraSize = sizeList.get(0);
        for (Camera.Size size : sizeList) {

            if (size.width * size.height < 10 * 100) {
                cameraSize = size;
                break;
            }
        }
        parameters.setPictureSize(cameraSize.width, cameraSize.height);
    }

    parameters.setPictureFormat(ImageFormat.JPEG);
    parameters.setJpegQuality(100);
    parameters.setJpegThumbnailQuality(100);

    parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
    camera.setParameters(parameters);

    startOrientationChangeListener();
}

private void startOrientationChangeListener() {

    OrientationEventListener mOrEventListener = new    OrientationEventListener(MainActivity.this) {
        @Override
        public void onOrientationChanged(int rotation) {

            if (((rotation >= 0) && (rotation <= 45)) || (rotation > 315)) {
                rotation = 0;
            } else if ((rotation > 45) && (rotation <= 135)) {
                rotation = 90;
            } else if ((rotation > 135) && (rotation <= 225)) {
                rotation = 180;
            } else if ((rotation > 225) && (rotation <= 315)) {
                rotation = 270;
            } else {
                rotation = 0;
            }
            if (rotation == mOrientation)
                return;
            mOrientation = rotation;
            updateCameraOrientation();
        }
    };
    mOrEventListener.enable();
}

 private void updateCameraOrientation() {
    if (camera != null) {
        Camera.Parameters parameters = camera.getParameters();

        int rotation = 90 + mOrientation == 360 ? 0 : 90 + mOrientation;

        if (mIsFrontCamera) {
            if (rotation == 90) rotation = 270;
            else if (rotation == 270) rotation = 90;
        }
        parameters.setRotation(rotation);

        camera.setDisplayOrientation(90);
        camera.setParameters(parameters);
    }
}

Answer 1

在Surface Callback的surfaceCreated方法中添加SurfaceHoler参数后试试class:

  holder = mSurfaceView.getHolder();
  holder.addCallback(this);
  holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

希望对你有帮助。

Answer 2

你可以从这个项目开始。https://github.com/pikanji/CameraPreviewSample

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