Android - getSupportedPreviewSizes 仅返回横向尺寸答案

【问题标题】：Android - getSupportedPreviewSizes only returns Landscape sizesAndroid - getSupportedPreviewSizes 仅返回横向尺寸
【发布时间】：2023-02-17 01:08:19
【问题描述】：

我正在尝试构建类似于 Instagram Live 的 Live 功能。我想在纵向模式下打开相机预览全屏。我正在使用下面的设置相机预览的大小。但我只是被拉伸和扭曲了。

原因是我们从中选择要使用的最佳分辨率的 getSupportedPreviewSizes 只返回横向尺寸而不是纵向尺寸（宽度 > 高度）。

知道怎么做getSupportedPreviewSizes()改为返回支持的纵向尺寸？

 public int[] setPreviewResolution(int width, int height) {                
        mCamera = openCamera();
        
        mPreviewWidth = width;
        mPreviewHeight = height;
        Camera.Size rs = adaptPreviewResolution(mCamera.new Size(width, height));
        if (rs != null) {
            mPreviewWidth = rs.width;
            mPreviewHeight = rs.height;
        }
        
        getHolder().setFixedSize(mPreviewWidth, mPreviewHeight);
        
        mCamera.getParameters().setPreviewSize(mPreviewWidth, mPreviewHeight);

        mGLPreviewBuffer = ByteBuffer.allocate(mPreviewWidth  mPreviewHeight  4);
        mInputAspectRatio = mPreviewWidth > mPreviewHeight ?
            (float) mPreviewWidth / mPreviewHeight : (float) mPreviewHeight / mPreviewWidth;

        return new int[] { mPreviewWidth, mPreviewHeight };
    }




    private Camera.Size adaptPreviewResolution(Camera.Size resolution) {
            float diff = 100f;
            float xdy = (float) resolution.width / (float) resolution.height;
            Camera.Size best = null;
            for (Camera.Size size : mCamera.getParameters().getSupportedPreviewSizes()) {
                Log.v("widthhhhhhhhhhhdddd supported","" +" size.width: "+size.width+"   hhhh: "+size.height);
                if (size.equals(resolution)) {
                    return size;
                }
                float tmp = Math.abs(((float) size.height / (float) size.width) - xdy);
                if (tmp < diff) {
                    diff = tmp;
                    best = size;
                }
    
            }
    
            return best;
        }

【问题讨论】：

标签： java android android-studio android-camera

【解决方案1】：

1- 使用 getSupportedPreviewSizes() 方法获取支持的预览尺寸。

2- 找到高度大于宽度的预览尺寸。这将是纵向模式尺寸。

3- 将预览尺寸设置为此纵向模式尺寸并使用setRotation(90) 旋转预览。

4- 要使预览全屏显示，请设置用于显示相机预览以填充父级的SurfaceView 或TextureView 的布局参数。

这是一个例子：

CameraManager cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
String cameraId = "0"; // Choose the desired camera ID
CameraCharacteristics characteristics = cameraManager.getCameraCharacteristics(cameraId);
StreamConfigurationMap configMap = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
Size[] sizes = configMap.getOutputSizes(SurfaceTexture.class);
Size portraitSize = null;

for (Size size : sizes) {
 if (size.getHeight() > size.getWidth()) {
    portraitSize = size;
    break;
  }
}

if (portraitSize != null) {
  previewSize = portraitSize;
  int rotation = getWindowManager().getDefaultDisplay().getRotation();
  int sensorOrientation = characteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);
  int deviceRotation = ORIENTATIONS.get(rotation);
  int totalRotation = (sensorOrientation + deviceRotation + 360) % 360;
  previewRequestBuilder.set(CaptureRequest.JPEG_ORIENTATION, totalRotation);
}
SurfaceView surfaceView = findViewById(R.id.camera_preview);
surfaceView.setLayoutParams(new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));

【讨论】：