Android View 的尺寸大小变化的时候要求有一个过度的动画

最近在项目里有个需求要求一个View 的尺寸大小变化的时候要求有一个过度的动画（view.getLayoutParams().height 100--->400）查看了一些资料后成功搞定，下面跟大家一起分享

解决的方法主要是继承Animation重写里面的几个方法，成功搞定

@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
    view.getLayoutParams().height = initialHeight + (int) ((targetHeight - initialHeight) * interpolatedTime);
    view.getLayoutParams().width = initialWidth + (int) ((targetWidth - initialWidth) * interpolatedTime);
    view.requestLayout();
}


@Override
public void initialize(int width, int height, int parentWidth, int parentHeight) {
    this.initialHeight = height;
    this.initialWidth = width;
    super.initialize(width, height, parentWidth, parentHeight);
}


@Override
public boolean willChangeBounds() {
    return true;
}

废话不多说，直接上代码

public class ViewSizeChangeAnimation extends Animation {
    int initialHeight;
    int targetHeight;
    int initialWidth;
    int targetWidth;
    View view;


    public ViewSizeChangeAnimation(View view, int targetHeight,int targetWidth) {
        this.view = view;
        this.targetHeight = targetHeight;
        this.targetWidth = targetWidth;
    }


    @Override
    protected void applyTransformation(float interpolatedTime, Transformation t) {
        view.getLayoutParams().height = initialHeight + (int) ((targetHeight - initialHeight) * interpolatedTime);
        view.getLayoutParams().width = initialWidth + (int) ((targetWidth - initialWidth) * interpolatedTime);
        view.requestLayout();
    }


    @Override
    public void initialize(int width, int height, int parentWidth, int parentHeight) {
        this.initialHeight = height;
        this.initialWidth = width;
        super.initialize(width, height, parentWidth, parentHeight);
    }


    @Override
    public boolean willChangeBounds() {
        return true;
    }
}

最后在java代码中调用

Animation animation = new ViewSizeChangeAnimation(imageView, isHide ? 100 : 1000, isHide ? 100 : 1000);
animation.setDuration(500);
imageView.startAnimation(animation);

好了，就这么简单，更多文章请移步 你我学习网www.niwoxuexi.com

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