android - 如何动画更改 VideoView 的大小？

Question

我有一个 VideoView，我想在我的应用程序中动态更改它的大小。通过扩展 VideoView 类，我已经成功地让 video 和 videoView 正确地改变了大小。但是，我希望能够在两种尺寸之间逐渐过渡。我怎样才能做到这一点？我试过缩放动画，但虽然这会改变 VideoView 布局的大小，但视频本身不会缩放。想法？

这是我的视频课:

public class MyVideoView extends VideoView {

    private int mForceHeight,mForceWidth;
    private int mOrigWidth, mOrigHeight, mMinWidth, mMinHeight;


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

    /* Will cause inflator errors if not present */
    public MyVideoView(Context context, AttributeSet attrs){
        super(context, attrs);
    }

    public void setDimensions(int w, int h) {
        this.mForceHeight = h;
        this.mForceWidth = w;
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        if (mForceHeight != 0)
            setMeasuredDimension(mForceWidth, mForceHeight);
        else
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }


    public void setOrigDimens(int width, int height) {
        mOrigWidth = width;
        mOrigHeight = height;

        mMinWidth = width/4;    // My own decision for the small size
        mMinHeight = height/4;
    }


    public void setSmallView() {
        setNewViewSize(mMinWidth, mMinHeight);
    }


    public void setNormalView() {
        setNewViewSize(mOrigWidth, mOrigHeight);
    }


    /* RESIZES THE VIEW */
    public void setNewViewSize(int width, int height) {
        mForceWidth = width;
        mForceHeight = height;
        setDimensions(width, height);
        getHolder().setFixedSize(width, height);
    }
}

这是我试过的缩放代码:

Animation scaling = new ScaleAnimation(1.0f, 0.2f, 1.0f, 0.2f);
scaling.setDuration(2000);
startAnimation(scaling);

非常感谢任何帮助!

Answer 1

我找到的一个解决方案是使用 ValueAnimator 来更改大小的比例，然后使用更新监听器强制视频实际更改大小。然而，它非常紧张:

ValueAnimator scaleDown = ValueAnimator.ofFloat(1, 0.25f);
    scaleDown.setDuration(1000);

    scaleDown.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
        public void onAnimationUpdate(ValueAnimator animation) {
            Float value = (Float) animation.getAnimatedValue();
            setNewViewSize(mOrigWidth*value, mOrigHeight*value);
        }
    });

    scaleDown.start();