一个正方形屏幕上的Android相机preVIEW拉伸

问题描述：

我建立的Android应用程序，但该设备确实有一个方形屏幕。屏幕是320x320起，相机应用程序使用SurfaceView显示如下preVIEW：

I'm building an app for Android but The device do have a square screen. The screen is 320x320 and the camera app use the SurfaceView to show the preview as below :

    mCameraView = (SurfaceView) findViewById(R.id.surface);
    LayoutParams params = mCameraView.getLayoutParams();
    int camera_dimension = getResources().getInteger(R.integer.camera_dimension);
    params.height = camera_dimension; //320px
    params.width = camera_dimension;

    mCameraView.setLayoutParams(params);
    mCameraViewHolder = mCameraView.getHolder();
    mCameraViewHolder.addCallback(this);
    mCameraViewHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

在表面改变，我做这个和它的作品，但支持者preVIEW是W480点¯xH320

On Surface changed, I'm doing this and it works but the supporter preview is w480 x h320

public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {

    int mWidth = w;
    int mHeight = h;
    int mFormat = format;

    try {
        mCameraAccess.mCamera.stopPreview();
    } catch (Exception e){
        // ignore: tried to stop a non-existent preview
    }
    Camera.Parameters param = mCameraAccess.mCamera.getParameters();

    List<Camera.Size> SupportedPreview = param.getSupportedPreviewSizes();
    int ScreenSize = getResources().getInteger(R.integer.camera_dimension);

    for (int i = 0; i < SupportedPreview.size(); i++) {
        if (SupportedPreview.get(i).height == ScreenSize) {
            param.setPreviewSize(SupportedPreview.get(i).width, SupportedPreview.get(i).height);
            break;
        }
    }
    mCameraAccess.mCamera.setParameters(param);
    mCameraAccess.mCamera.startPreview();
}

如何才能确保viewholder里面我的preVIEW不是COM pressed而是一种centercrop的。由于preVIEW是长方形的，我只需要在图像上居中的广场。通常我使用scaleType，但它不是在表面观支持

How can make sure that my preview inside the viewholder is not compressed but a kind of centercrop. As the preview is a rectangle, I just need the square centered on the image. Usually I'm using scaleType but it's not supported in Surface view

任何想法？

答

我已经想通了，解决的办法是：

The solution which i have figured out is:

1） - 保持表面观全屏，所以这是不舒展。

1)-Keep surface view full screen,so that is doesn't stretch.

2）在-put全opacity.So surfaceview一种观点认为是看起来像相机已经平方。

2)-Put a view over surfaceview with full opacity.So that is looks like camera is already squared.

3） - 后捕捉图像或视频，你将不得不裁剪他们。

3)-After capturing image or video,you will have to crop them.

有关视频，你必须使用一些视频处理库像javacv.Using这个库，你可以提取视频帧，将它们转换为位图，裁剪位图广场，然后重新连接code到视频。

For video you have to use some video processing library like javacv.Using this library you can extract video frames,convert them to bitmap,crop bitmap in square and then re-encode into video.

要得到你需要玩不同的技术，比如根据自己的需要拍摄等过程中变焦相机准确的结果。

To get accurate results you will need to play around with different techniques like zooming camera during capture etc. according to your needs.

原始图像：

平方图片：

一个正方形屏幕上的Andr​​oid相机preVIEW拉伸

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一个正方形屏幕上的Android相机preVIEW拉伸