如何获得像 Instagram 一样比例 1:1 的 Android Camera2？

Question

我的问题很简单：

How to get an Android android.hardware.Camera2 with 1:1 ratio and without deformation like Instagram?

我使用 GoogeSamples 项目进行了测试 android-Camera2Basic。但是当我用 1:1 的比例更改预览时，图像变形了。有人对此有想法吗？

Answer 1

感谢@CommonsWare。

我按照你的建议使用了负边距（顶部和底部）并且有效。

为此，我只是这样更新 AutoFitTextureView the GoogeSamples project android-Camera2Basic：

public class AutoFitTextureView extends TextureView {

    //...
    private boolean mWithMargin = false;

    //...

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, widthMeasureSpec);
        int width = MeasureSpec.getSize(widthMeasureSpec);
        int height = MeasureSpec.getSize(heightMeasureSpec);
        int margin = (height - width) / 2;

        if(!mWithMargin) {
            mWithMargin = true;
            ViewGroup.MarginLayoutParams margins = ViewGroup.MarginLayoutParams.class.cast(getLayoutParams());
            margins.topMargin = -margin;
            margins.bottomMargin = -margin;
            margins.leftMargin = 0;
            margins.rightMargin = 0;
            setLayoutParams(margins);
        }

        if (0 == mRatioWidth || 0 == mRatioHeight) {
            setMeasuredDimension(width, height);
        } else {
            if (width < height) {
                setMeasuredDimension(width, width * mRatioHeight / mRatioWidth);
            } else {
                setMeasuredDimension(height * mRatioWidth / mRatioHeight, height);
            }
        }
    }
}

Answer 2

像这样创建自定义纹理视图：

public class AutoFitTextureView extends TextureView {

    private int mCameraWidth = 0;
    private int mCameraHeight = 0;
    private boolean mSquarePreview = false;

    public AutoFitTextureView(Context context) {
        this(context, null);
    }

    public AutoFitTextureView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public AutoFitTextureView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public void setAspectRatio(int width, int height, boolean squarePreview) {
        if (width < 0 || height < 0) {
            throw new IllegalArgumentException("Size cannot be negative.");
        }
        mCameraWidth = width;
        mCameraHeight = height;
        mSquarePreview = squarePreview;
        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 == mCameraWidth || 0 == mCameraHeight) {
            setMeasuredDimension(width, height);
        } else {
            /**
             * Vertical orientation
             */
            if (width < height) {
                if (mSquarePreview) {
                    setTransform(squareTransform(width, height));
                    setMeasuredDimension(width, width);
                } else {
                    setMeasuredDimension(width, width * mCameraHeight / mCameraWidth);
                }
            }
            /**
             * Horizontal orientation
             */
            else {
                if (mSquarePreview) {
                    setTransform(squareTransform(width, height));
                    setMeasuredDimension(height, height);
                } else {
                    setMeasuredDimension(height * mCameraWidth / mCameraHeight, height);
                }
            }
        }
    }

    private Matrix setupTransform(int sw, int sh, int dw, int dh) {
        Matrix matrix = new Matrix();
        RectF src = new RectF(0, 0, sw, sh);
        RectF dst = new RectF(0, 0, dw, dh);
        RectF screen = new RectF(0, 0, dw, dh);

        matrix.postRotate(-90, screen.centerX(), screen.centerY());
        matrix.mapRect(dst);

        matrix.setRectToRect(src, dst, Matrix.ScaleToFit.CENTER);
        matrix.mapRect(src);

        matrix.setRectToRect(screen, src, Matrix.ScaleToFit.FILL);
        matrix.postRotate(-90, screen.centerX(), screen.centerY());

        return matrix;
    }

    private Matrix squareTransform(int viewWidth, int viewHeight) {
        Matrix matrix = new Matrix();

        if (viewWidth < viewHeight) {
            MyLogger.log(AutoFitTextureView.class, "Horizontal");
            matrix.setScale(1, (float) mCameraHeight / (float) mCameraWidth, viewWidth / 2, viewHeight / 2);
        } else {
            MyLogger.log(AutoFitTextureView.class, "Vertical");
            matrix.setScale((float) mCameraHeight / (float) mCameraWidth, 1, viewWidth / 2, viewHeight / 2);
        }

        return matrix;
    }
}

并为 activity/fragment 中的纹理视图调用 setAspectRatio。

if (mVideoSize.width > mVideoSize.height) {
    mTextureView.setAspectRatio(mVideoSize.height, mVideoSize.width, true);
} else {
    mTextureView.setAspectRatio(mVideoSize.width, mVideoSize.height, true);
}
mCamera.setPreviewTexture(mTextureView.getSurfaceTexture());
mCamera.startPreview();

Answer 3

我是用 Layout 做的，这样，google 代码可以保持原样，并根据 UI.[=12 自动设置 1:1 预览=]

    <android.support.constraint.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_above="@id/footer"
    android:layout_below="@id/header">

    <com.example.android.camera2video.AutoFitTextureView
        android:id="@+id/texture"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintDimensionRatio="w,1:1"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        />

</android.support.constraint.ConstraintLayout>

只需将 AutoFitTextureView 放入 ConstraintLayout 中，然后

previewSize = chooseOptimalSize(map.getOutputSizes(SurfaceTexture.class), width, height, videoSize); 施展所有魔法

Answer 4

对于寻找此内容的任何人，我尝试了。添加边距以隐藏部分 textureview 以使其在预览中看起来很正方形。但是在保存图片的时候，你也应该从输出图片中移除隐藏区域。

一个更简单的解决方案是显示完整的纹理视图并在其上覆盖一些其他布局，使其看起来 square.You 可以轻松地从输出中裁剪图像。

你可以找到示例代码here

如何获得像 Instagram 一样比例 1:1 的 Android Camera2？

How to get an Android Camera2 with 1:1 ratio like Instagram?

android

android-camera2