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

Question

My question is very simple:

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

I tested with the GoogeSamples project android-Camera2Basic. But when I change the preview with a ratio of 1:1 image is deformed. Does anyone have an idea on this?

score 6 · Accepted Answer

谢谢@CommonsWare。

我按照您的建议使用负边距（顶部和底部）并且它有效。

为此，我只需以这种方式更新GoogeSamples项目android-Camera2Basic 的 AutoFitTextureView：

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);
            }
        }
    }
}

score 1 · Accepted Answer

对于任何寻找这个的人，我尝试了上面的答案。添加边距以隐藏部分纹理视图，使其在预览中看起来不错。但是在保存图像时，您还应该从输出图像中删除隐藏区域。

一个更简单的解决方案是显示一个完整的纹理视图并在其上覆盖一些其他布局以使其看起来是方形的。您可以轻松地从输出中裁剪图像。

你可以在这里找到示例代码

score 1 · Accepted Answer

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;
    }
}

并在活动/片段中为您的纹理视图调用 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();

score 1 · Accepted Answer

我是用 Layout 做的，这样，google 代码可以保持原样，并根据 UI 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 放在 ConstraintLayout 中，然后

previewSize = chooseOptimalSize(map.getOutputSizes(SurfaceTexture.class), width, height, videoSize); 做所有的魔法

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

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