可以通过编写自定义View，覆盖VideoView的默认行为来解决这个问题。以下是一个示例代码：

public class ScalableVideoView extends VideoView {

    private int mVideoWidth;
    private int mVideoHeight;

    public ScalableVideoView(Context context) {
        super(context);
    }

    public ScalableVideoView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public ScalableVideoView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        if (mVideoWidth == 0 || mVideoHeight == 0) {
            setMeasuredDimension(getMeasuredWidth(), getMeasuredHeight());
        } else {
            int width = getMeasuredWidth();
            int height = getMeasuredHeight();
            float scaleX = (float) mVideoWidth / (float) width;
            float scaleY = (float) mVideoHeight / (float) height;
            float scale = Math.max(scaleX, scaleY);
            width = (int) ((float) mVideoWidth / scale);
            height = (int) ((float) mVideoHeight / scale);
            setMeasuredDimension(width, height);
        }
    }

    public void setVideoSize(int videoWidth, int videoHeight) {
        mVideoWidth = videoWidth;
        mVideoHeight = videoHeight;
        requestLayout();
    }
}

您可以将此自定义视图放在XML中，并像VideoView一样使用它。要指定视频的大小，请使用setVideoSize（）方法：

mScalableVideoView.setVideoSize(videoWidth, videoHeight);