camera2捕获与预览不同的图像

Question

my capture picture output not same with my camera preview in landscape mode

1. before cpture

2. after capture

whats wrong ? and whats have i do. thanks

Answer 1

This is the AutoFitTextView class which I pulled from Google sample. You can take a look at here . It aims to show camera view and config the ratio base on the physical size of device.

public class AutoFitTextureView extends TextureView {

    private int mRatioWidth = 0;
    private int mRatioHeight = 0;

    // Some codes here...

    public void setAspectRatio(int width, int height) {
        if (width < 0 || height < 0) {
            throw new IllegalArgumentException("Size cannot be negative.");
        }
        mRatioWidth = width;
        mRatioHeight = height;
        requestLayout();
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int width = MeasureSpec.getSize(widthMeasureSpec);
        int height = MeasureSpec.getSize(heightMeasureSpec);
        if (0 == mRatioWidth || 0 == mRatioHeight) {
            setMeasuredDimension(width, height);
        } else {
            if (width < height * mRatioWidth / mRatioHeight) {
                setMeasuredDimension(width, width * mRatioHeight / mRatioWidth);
            } else {
                setMeasuredDimension(height * mRatioWidth / mRatioHeight, height);
            }
        }
    }
}

There are 2 points in this class:

1. You can't ensure the ratio works properly in every device . However, we are able to choose optimized size which is already defined in this class .
2. This condition is wrong: if (width < height * mRatioWidth / mRatioHeight) . It should be > because when width is bigger than height, we calculate and set measure dimension base on width (not height).

UPDATED

If you just want every device will work properly in a particular ratio, then set hard ratio for it (for instance: 4/3)

You can achieve that by replacing those lines of code:

mPreviewSize = chooseOptimalSize(map.getOutputSizes(SurfaceTexture.class),
                        rotatedPreviewWidth, rotatedPreviewHeight, maxPreviewWidth,
                        maxPreviewHeight, largest);

-> previewSize = Size(4, 3)